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• Copying symbolic links and filenames with special characters to NAS

  - by Mr E

  I have a new Western Digital My Book Live NAS. I am trying to copy files from an old drive to the NAS. I'm using Ubuntu 12.04 and I've mounted the drive by browsing the network in Nautilus and choosing a shared folder configured on the NAS. The shared folder is then automatically mounted at .gvfs/files on mybooklive. There are two problems so far: File names and directory names containing certain characters (e.g. : or |). Attempting to copy these results in the error message: cp: cannot stat `/path/to/destination.filename': Invalid argument Symbolic links. In Nautilus I get the error message: Symlinks not supported by backend My questions are: Can I connect to the NAS or configure the NAS so that I can copy my files without this problem? (In case it matters, I don't need Windows compatibility.) If not, what can I do to identify all the problem files? Can I do anything to automatically fix my filenames Please let me know if any of this needs clarification. I'm not too familiar with all of this so I may have left out some useful information.

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• Route forwarded traffic through eth0 but local traffic through tun0

  - by Ross Patterson

  I have a Ubuntu 12.04/Zentyal 2.3 server configured with WAN NATed on eth0, local interfaces eth1 and wlan0 bridged on br1 on which DHCP runs, and an OpenVPN connection on tun0. I only need the VPN for some things running on the gateway itself and I need to make sure that everything running on the gateway goes through the VPNs tun0. root:~# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface default gw... 0.0.0.0 UG 100 0 0 eth0 link-local * 255.255.0.0 U 1000 0 0 br1 192.168.1.0 * 255.255.255.0 U 0 0 0 br1 A.B.C.0 * 255.255.255.0 U 0 0 0 eth0 root:~# ip route 169.254.0.0/16 dev br1 scope link metric 1000 192.168.1.0/24 dev br1 proto kernel scope link src 192.168.1.1 A.B.C.0/24 dev eth0 proto kernel scope link src A.B.C.186 root:~# ip route show table main 169.254.0.0/16 dev br1 scope link metric 1000 192.168.1.0/24 dev br1 proto kernel scope link src 192.168.1.1 A.B.C.0/24 dev eth0 proto kernel scope link src A.B.C.D root:~# ip route show table default default via A.B.C.1 dev eth0 How can I configure routing (or otherwise) such that all forwarded traffic for other hosts on the LAN goes through eth0 but all traffic for the gateway itself goes through the VPN on tun0? Also, since the OpenVPN client changes routing on startup/shutdown, how can I make sure that everything running on the gateway itself loses all network access if the VPN goes down and never goes out eth0.

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• How to whitelist external access to an internal webserver via Cisco ACLs?

  - by Josh

  This is our company's internet gateway router. This is what I want to accomplish on our Cisco 2691 router: All employees need to be able to have unrestricted access to the internet (I've blocked facebook with an ACL, but other than that, full access) There is an internal webserver that should be accessible from any internal IP address, but only a select few external IP addresses. Basically, I want to whitelist access from outside the network. I don't have a hardware firewall appliance. Until now, the webserver has not needed to be accessible externally... or in any case, the occasional VPN has sufficed when needed. As such, the following config has been sufficient: access-list 106 deny ip 66.220.144.0 0.0.7.255 any access-list 106 deny ip ... (so on for the Facebook blocking) access-list 106 permit ip any any ! interface FastEthernet0/0 ip address x.x.x.x 255.255.255.248 ip access-group 106 in ip nat outside fa0/0 is the interface with the public IP However, when I add... ip nat inside source static tcp 192.168.0.52 80 x.x.x.x 80 extendable ...in order to forward web traffic to the webserver, that just opens it up entirely. That much makes sense to me. This is where I get stumped though. If I add a line to the ACL to explicitly permit (whitelist) an IP range... something like this: access-list 106 permit tcp x.x.x.x 0.0.255.255 192.168.0.52 0.0.0.0 eq 80 ... how do I then block other external access to the webserver while still maintaining unrestricted internet access for internal employees? I tried removing the access-list 106 permit ip any any. That ended up being a very short-lived config :) Would something like access-list 106 permit ip 192.168.0.0 0.0.0.255 any on an "outside-inbound" work?

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• I can't download or stream for more then 3 sec, and then the conection activity just dies

  - by JMHein

  Just got a new internet connection installed at my sisters place, but it randomly just stops working. At first it was only affecting flash videos. they would randomly just stop buffering. I did a lot of research on this and found that there can be many things that cause this exact trouble. I then tried IE and some flash would stream fine, but still random deaths. So I told my brother in law to reset the router and modem and that fixed the problem for them but not my laptop. I then started trying to fix the flash problem only to fined that downloads of any kind were affected. Now it is so bad that 50% of page loads will never finish because the connection drops to 0% usage with in a split sec. I can't get flash reinstalled because the installer is trying to download but the download dies at 8% I tried up loading a large file by FTP to a web server with no troubles. Yet any activity on my end that takes longer then about 1 sec to finish, just never finishes I can watch the network log in the taskmanager and it spikes for ruffly one sec then drops back to zero and when I go back to the web page it says it is still loading and no matter how long I let it sit it never does any thing more till I reload then it will again create a very short spike of activity on the connection and then drop to zero. Also if I start a download and it does drop off I can restart the download where it left off and get up to 100Kb/s for around the same one sec then it drops to around 14Kb/s then zero a sec latter... I am running Win 7 home prem x64 with FF11 and IE8 I have simply tried every thing I can short of calling up the ISP which very likely will get me no where fast. any advice on what step to take to figure this out would be nice. I am not even sure it is not just an ISP problem. (at least I should be able to get flash reinstalled once I get back home)

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• apache2: ssl_error_rx_record_too_long when visiting port 80? help!

  - by John

  Hi, I have an Ubuntu 10 x64 server edition machine. I got a second IP and configured /etc/network/interfaces like so (actual IPs and gateways removed): [code] auto lo iface lo inet loopback iface eth0 inet dhcp auto eth0 auto eth0:0 iface eth0 inet static address [ my first IP ] netmask 255.255.255.0 gateway [ my first gateway ] iface eth0:0 inet static address [ my second IP ] netmask 255.255.255.0 gateway [ my second gateway ] [/code] /etc/apache2/ports.conf: [code] Listen 80 NameVirtualHost [ my first IP ]:80 NameVirtualHost [ my second IP ]:80 # If you add NameVirtualHost *:443 here, you will also have to change # the VirtualHost statement in /etc/apache2/sites-available/default-ssl # to # Server Name Indication for SSL named virtual hosts is currently not # supported by MSIE on Windows XP. Listen 443 NameVirtualHost [ my first IP - some site is running SSL successfully using it ]:443 Listen 443 [/code] /etc/apache2/sites-enabled/mysite.conf: [code] ServerName mysite.com Include /var/www/mysite.com/djangoproject/apache/django.conf [/conf] [/code] Then when visiting http[mysite].com:80 or http[mysite].com (:// removed because serverfault doesn't allow me to post hyperlinks), I get: [code] An error occurred during a connection to [mysite].com. SSL received a record that exceeded the maximum permissible length. (Error code: ssl_error_rx_record_too_long) [/code] My guess is that the configuration file is not being picked up, and apache is therefore looking for the default-ssl file, which is not in conf-enabled. If I were to configure that file properly, it seems I would successfully connect to whatever default directory is specified in the default-ssl file. But I want to connect to my website. Any ideas? Thanks in advance!

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• PHP & MySQL on Mac OS X: Access denied for GUI user

  - by Eirik Lillebo

  Hey! This question was first posted to Stack Overflow, but as it is perhaps just as much a server issue I though it might be just as well to post it here also. I have just installed and configured Apache, MySQL, PHP and phpMyAdmin on my Macbook in order to have a local development environment. But after I moved one of my projects over to the local server I get a weird MySQL error from one of my calls to mysql_query(): Access denied for user '_securityagent'@'localhost' (using password: NO) First of all, the query I'm sending to MySQL is all valid, and I've even testet it through phpMyAdmin with perfect result. Secondly, the error message only happens here while I have at least 4 other mysql connections and queries per page. This call to mysql_query() happens at the end of a really long function that handles data for newly created or modified articles. This basically what it does: Collect all the data from article form (title, content, dates, etc..) Validate collected data Connect to database Dynamically build SQL query based on validated article data Send query to database before closing the connection Pretty basic, I know. I did not recognize the username "_securityagent" so after a quick search I came across this from and article at Apple's Developer Connection talking about some random bug: Mac OS X's security infrastructure gets around this problem by running its GUI code as a special user, "_securityagent". Then I tried put a var_dump() on all variables used in the mysql_connect() call, and every time it returns the correct values (where username is not "_securityagent" of course). Thus I'm wondering if anyone has any idea why 'securityagent' is trying to connect to my database - and how I can keep this error from occurring when I call mysql_query(). Update: Here is the exact code I'm using to connect to the database. But a little explanation must follow: The connection error happens at a call to mysql_query() in function X in class_1 class_1 uses class_2 to connect to database class_2 reads a config file with the database connection variables (host, user, pass, db) class_2 connect to the database through the following function: var $SYSTEM_DB_HOST = ""; function connect_db() { // Reads the config file include('system_config.php'); if (!($SYSTEM_DB_HOST == "")) { mysql_connect($SYSTEM_DB_HOST, $SYSTEM_DB_USER, $SYSTEM_DB_PASS); @mysql_select_db($SYSTEM_DB); return true; } else { return false; } }

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• Apple Service Diagnostic application on USB key?

  - by Matt 'Trouble' Esse

  I found the following in a text file, and I would like to use the Apple Service Diagnostic Application from a bootable USB key but I cannot find where to download it or set it up? Also is this free software or does it require a separate licence? It sounds like it would be a useful tool for diagnosing Mac problems. The Apple Service Diagnostic application is designed to run both EFI and Mac OS X tests from an external USB hard drive. Apple Service Diagnostic (EFI) runs low-level tests of the hardware directly and does not require Mac OS X, while Apple Service Diagnostic (OS) uses Mac OS X to run tests. Booting and Using the Apple Service Diagnostic Application - Before using Apple Service Diagnostic, disconnect any Ethernet network, USB, and audio cables. - With the USB hard drive containing ASD 3S123 plugged into a USB port, restart the computer and hold down the option key as the computer boots up into the Startup Manager. To run ASD (EFI) select the "ASD EFI 3S123" drive icon and press return or select it with a mouse click. To run ASD (OS) select the "ASD OS 3S123" drive icon and press return or select it with a mouse click. ASD (EFI) will load in 20-30 seconds; ASD (OS) will load in 2-3 minutes. - After running ASD (OS) or ASD (EFI), press the Restart button to restart the computer back into the normal startup volume, or hold down the option key to get back to the Startup Manager. ASD is no longer delivered as an image to be restored onto a DVD. ASD 3S117 and newer versions requires installation onto an external USB hard drive. For more information, please refer to the document "Installing ASD on a USB hard drive".

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• nameserver spoiling avahi multicast name resolution of .local domain

  - by Doug Coburn

  After trying to ping a machine on my local network, I noticed that I was trying hit address 66.152.109.24. This is an external public address. Resolution should have occurred via avahi mDNS. I ran dig to see how the name resolution worked and my quest/centurylink name server was retuning results for my .local domain queries! I tried a random name and got the same ip address result. $ dig jakdafj.local ; <<>> DiG 9.8.1-P1-RedHat-9.8.1-3.P1.fc15 <<>> jakdafj.local ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58410 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;jakdafj.local. IN A ;; ANSWER SECTION: jakdafj.local. 10 IN A 66.152.109.24 jakdafj.local. 10 IN A 204.232.231.46 ;; Query time: 104 msec ;; SERVER: 205.171.3.25#53(205.171.3.25) ;; WHEN: Sat Mar 24 20:40:17 2012 ;; MSG SIZE rcvd: 63 Am I missing something or is my DNS name server at 205.171.3.25 corrupted?

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• The physical working paradigm of a signal passing on wire.

  - by smwikipedia

  Hi, This may be more a question of physics, so pardon me if there's any inconvenience. When I study computer networks, I often read something like this in order to represent a signal, we place some voltage on one end of the wire and the other end will detect the voltage and thus the signal. So I am wondering how a signal exactly passes through wire? Here's my current understanding based on my formal knowledge about electronics: First we need a close circuit to constrain/hold the electronic field. When we place a voltage at somewhere A of the circuit, electronic field will start to build up within the circuit medium, this process should be as fast as light speed. And as the electronic field is being built up, the electrons within the circuit medium are moved, and thus electronic current occurs, and once the electronic current is strong enough to be detected at somewhere else B on the complete circuit, then B knows about what has happend at A and thus communication between A and B is achieved. The above is only talking about the process of sending a single voltage through wire. If there's a bitstream and we need to send a series of voltages, I am not sure which of the following is true: The 2nd voltage should only be sent from A after the 1st voltage has been detected at B, the time interval is time needed to stimulate the electronic field in the medium and form a detectable electronic current at B. Several different voltages could be sent on wire one by one, different electronic current values will exists along the wire simutaneously and arrive at B successively. I hope I made myself clear and someone else has ever pondered this question. (I tag this question with network cause I don't know if there's a better option.) Thanks, Sam

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• nginx, php-fpm, and multiple roots - how to properly try_files?

  - by Carson C.

  I have a server context which is rooted in a login application. The login application handles, well, logins, and then returns a redirect to "/app" on the same server if a login is successful. The application is rooted elsewhere, which is handled by the location block shown here: location ^~ /app { alias /usr/share/nginx/www/website.com/content/public; location ~ \.php$ { try_files $uri =404; fastcgi_pass unix:/tmp/php5-fpm.sock; include fastcgi_params; } } This works just fine, however the $uri getting passed to PHP still contains /app, even though I am using alias rather than root. Because of this, the try_files directive fails to a 404 unless I link app -> ./ in /usr/share/nginx/www/website.com/content/public. It's obviously silly to have that link in there, and if that link ever gets lost, bam dead website without an obvious cause. The next thing I tried... Was to remove the try_files directive entirely. This allowed me to rm the app link in my /public folder, and PHP had no problem locating the file and executing it. I used that to dump my $_SERVER global from PHP, and found that "SCRIPT_FILENAME" => "/usr/share/nginx/www/website.com/content/public/index.php" when the browser URI is /app. This is exactly right. Based on my fastcgi_params below, this led me to beleive that try_files $request_filename =404; should work, but no dice. nginx still doesn't find the file, and returns 404. So for right now, it will only work without any try_files directive. PHP finds the file, whereas try_files could not. I understand this may be a PHP security risk. Can anyone indicate how to move forward? The nginx logs don't contain anything relating to the failed try_files attempt, as far as I can see. fastcgi_aparams fastcgi_param QUERY_STRING $query_string; fastcgi_param REQUEST_METHOD $request_method; fastcgi_param CONTENT_TYPE $content_type; fastcgi_param CONTENT_LENGTH $content_length; fastcgi_param SCRIPT_FILENAME $request_filename; fastcgi_param SCRIPT_NAME $fastcgi_script_name; fastcgi_param REQUEST_URI $request_uri; fastcgi_param DOCUMENT_URI $document_uri; fastcgi_param DOCUMENT_ROOT $document_root; fastcgi_param SERVER_PROTOCOL $server_protocol; fastcgi_param GATEWAY_INTERFACE CGI/1.1; fastcgi_param SERVER_SOFTWARE nginx/$nginx_version; fastcgi_param REMOTE_ADDR $remote_addr; fastcgi_param REMOTE_PORT $remote_port; fastcgi_param SERVER_ADDR $server_addr; fastcgi_param SERVER_PORT $server_port; fastcgi_param SERVER_NAME $server_name; fastcgi_param HTTPS $server_https;

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• Permissions won't cascade more than 1 level

  - by Jovin_

  Running Windows Small Business Server 2011 I have a file structure with a lot of sub folders (sometimes 5-6 levels deep). I have created access groups to grant access to my users, and also deny groups to deny access to others. X Access & X Deny. These allow or deny access to a mapped network drive X: On the server I put in the groups with Full Control Allow for X Access and Full Control Deny for X Deny, I also tick the box "Apple these permissions to objects and/or containers within this container only" and have ensured that "Apply to:" is "This folder, subfolders and files". But for some reason the permissions will only apply to the next level of folders & files. ex. structure: X: Folder 1 Folder 1a Folder 2 Folder 2a If I apply the permissions to X: it'll only go to Folder 1 & 2, not 1a and 2a, I then need to manually apply the permissions to these too. Is this working as intended or am I doing something wrong?

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• Does water damage a fiber optic / cat5 cable

  - by chris

  One of the buildings I support recently had an adventure with a broken fire sprinkler. Lots of water everywhere. One of the "drains" the water used was the vertical risers between network closets. The cable plant in this building has bundles of cat5e as well as conduit with bundles of multimode fiber optic cables. The fiber is standard multi strand plenum rated stuff that terminates in boxes that have the patches to the switches. As far as I can tell, no water got near the ends of the cables (fiber or copper) but the conduit was saturated, and is likely still saturated because there isn't any air flow to dry the cables out. My gut reaction is that while it didn't do the cables any favors, it likely also isn't going to cause any problems. A little more reading / googling around leads me to believe that the water may cause problems down the road. Some pretty pictures so everyone knows what I'm talking about: Fiber conduit: Vertical riser, going down: Vertical riser, going up: Does anyone have any experience with this sort of damage and how to deal with it? Should we just ask the insurance adjuster to add "pull new structured cable" to the list of things to be replaced? And, if the opinion is "replace it because it'll start failing randomly over time" please include links that describe the specific failure modes, so I've got some ammo to use with the adjuster.

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• How to grow to be global sysadmin of an organization?

  - by user64729

  Bit of a non-technical question but I have seen questions of the career development type on here before so hopefully it is fine. I work for a fast growing but still small organization (~65 employees). I have been their external sysadmin for a while now, looking after hosted Linux servers and infrastructure. In the past 12 months I have been transforming into the internal sysadmin for our office too. I'm currently studying Cisco CCNA to cover the demands of being an internal sysadmin and looking after the office LAN, routers, switches and VPNs. Now they want me to look after the global sysadmin function of the organization as a whole. The organization has 3 offices in total, 2 in the UK and 1 in the US. I work in one of the UK offices. The other offices are primarily Windows desktops with AD domain shops. My office is primarily a Linux shop with a file-server and NFS/NIS (no AD domain for the Windows desktops yet but it's in the works). Each other office has a sysadmin which in theory I am supposed to supervise but in reality each is independent. I have a very competent junior sysadmin working with me who shares the day-to-day tasks and does some of the longer term projects with my supervision. My boss has asked me how to grow from being the external sysadmin to the global sysadmin. I am to ponder this and then report back to him on how to achieve this. My current thoughts are: Management training or professional development - eg. reading books such as "Influencer" and "7 Habits". Also I feel I should take steps to improving communication skills since a senior person is expected to talk and speak out more often. Learn more about Windows and Active Directory - I'm an LPI-certified guy and have a lot of experience in Linux (Ubuntu or desktop, Debian/Ubuntu as server). Since the other offices are mainly Windows-domains it makes sense to skill-up in that area so I can understand what the other admins are talking about. Talk to previous colleagues who have are are in this role already - to try and get the benefit of their experience. Produce an "IT Roadmap" or similar that maps out where we want the organization to be and when, plotted out over the next couple of years with regards to internal and external infrastructure. I have produced a "Security roadmap" already which does cover some of these things. I guess this can summed up as "thinking more strategically"? I'd appreciate comments from anyone who has been through a similar situation, thanks.

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• How do I get a Mac to request a new IP address from another DHCP server running in parallel while Ne

  - by huyqt

  Hello, I have an interesting situation. I'm trying to us a Linux based machine to allow Mac's to Netboot (similiar to PXE boot) by running a DHCP service in parallel with the "global" DHCP server. The local DHCP server hands out IPs in a private subnet, e.g., 10.168.0.10-10.168.254-254, while the "global" DHCP server hands out IPs from the IP range 10.0.0.1 - 10.0.1.254. The local DHCP range is only supposed to be used in Preboot Execution Environment and Netboot. The local DHCP server is something I have control over, but I do not have access to the global DHCP server. I have a filter to only allow members with the vendor strings "AAPLBSDPC/i386" and "PXEClient". PXE works fine, but Netboot has a quirk. The Apple systems that haven't been connected to the network yet can Netboot fine. But once it grabs a "real" IP address from the global DHCP server, it will "save" it and request it the next time we want it to netboot (which the local dhcp server won't give it). This is what I want: Mar 30 10:52:28 dev01 dhcpd: DHCPDISCOVER from 34:15:xx:xx:xx:xx via eth1 Mar 30 10:52:29 dev01 dhcpd: DHCPOFFER on 10.168.222.46 to 34:15:xx:xx:xx:xx via eth1 Mar 30 10:52:31 dev01 dhcpd: DHCPREQUEST for 10.168.222.46 (10.168.0.1) from 34:15:xx:xx:xx:xx via eth1 Mar 30 10:52:31 dev01 dhcpd: DHCPACK on 10.168.222.46 to 34:15:xx:xx:xx:xx via eth1 Mar 30 10:52:32 dev01 in.tftpd[5890]: tftp: client does not accept options Mar 30 10:52:53 dev01 in.tftpd[5891]: tftp: client does not accept options Mar 30 10:52:53 dev01 in.tftpd[5893]: tftp: client does not accept options Mar 30 10:52:54 dev01 in.tftpd[5895]: tftp: client does not accept options This is what I get when it already has a "stored" IP: Mar 30 10:51:29 dev01 dhcpd: DHCPDISCOVER from 00:25:xx:xx:xx:xx via eth1 Mar 30 10:51:30 dev01 dhcpd: DHCPOFFER on 10.168.222.45 to 00:25:xx:xx:xx:xx via eth1 Mar 30 10:51:31 dev01 dhcpd: DHCPREQUEST for 10.0.0.61 (10.0.0.1) from 00:25:xx:xx:xx:xx via eth1: ignored (not authoritative). Do you have any suggestions? It would be much appreciated.

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• Configure Domino to use SMTP routing and hMailServer

  - by Sébastien Lachance

  I have been trying for a couple of days to set up a Domino 8.5 server. Basically, I want everything to be run inside a local network. Right now I can send email to other user in the Domino directory without any mail address. I am pretty new to all this stuff, so maybe the answer will be really obvious. What I need to do is be able to send a mail from somewhere else to a domino user that will be redirected to his account. On the Domino server, I also have hMailServer installed on port 25. I configured Domino to use port 26. I followed those step to get where I am now. -I have set the Fully qualified Internet host name to "preview.notes". -Smtp Listener task changed to Enabled to turn on the Listener so that the server can receive messages routed via SMTP routing -Setting up SMTP routing within the local Internet domain (http://www.h2l.com/help/help85%5Fadmin.nsf/f4b82fbb75e942a6852566ac0037f284/7f9738a49efc4f58852574d500097b01?OpenDocument) -I modified the person to use the [email protected] address. -I'm using the hMailServer (which have the local "preview.local" domain name) to send mail to [email protected]. When sending mail I got an error telling that the DNS is not set up correctly. Is using the Domino Smtp server instead of hMailServer will solve the problem? I can Telnet the Domino Smtp Server.

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• Instabilities with Bridged and bonded interfaces

  - by Henry-Nicolas Tourneur

  I did post yesterday to get a working setup with several bridged interfaces used for virtual machines (KVM/libvirt). One of the bridged interface is just using eth3 as its ports while the second one (public traffic) is using an ethernet bonded interface. That setup is working but not all the time ! I can start a download from a vm, then it will stop and freeze! So I don't know if my bridge parameters are correct, could you check the below config ? iface eth3 inet manual auto bond0 iface bond0 inet manual slaves eth1 eth2 pre-up ip link set bond0 up down ip link set bond0 down auto br0 iface br0 inet static address 10.160.0.7 netmask 255.255.255.128 bridge_ports eth3 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp on auto br0:1 iface br0:1 inet static address 10.160.0.9 netmask 255.255.255.255 auto br0:2 iface br0:2 inet static address 10.160.0.10 netmask 255.255.255.255 auto br1 iface br1 inet static address 217.4.40.242 netmask 255.255.255.240 gateway 217.4.40.241 pre-up /etc/network/firewall start bridge_ports bond0 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp on auto br1:1 iface br1:1 inet static address 217.4.40.252 netmask 255.255.255.255 auto br1:2 iface br1:2 inet static address 217.4.40.253 netmask 255.255.255.255 And yes, it also sometimes speaks about martian on the host: kernel: [249146.055172] martian source 10.160.0.17 from 10.160.0.10, on dev vnet2 kernel: [249146.073122] ll header: ff:ff:ff:ff:ff:ff:54:52:00:76:c3:5c:08:06

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• PNP4Nagios, nagiosgraph, separate Cacti, or something else for Nagios trending.

  - by Matt

  I've been using Nagios for a while now and recently started using Cacti after being dissatisfied with the lack of scaling and lack of any GUI in MRTG. I'm interested in adding trending to my Nagios installation and wondered what was the best route to go. I've looked around a bit and have seen what's available, but there's not a lot of information around to differentiate them from each other. My Nagios install has about 250 hosts and 1100 service checks, but many of them are just simple network devices and there's only about 20 servers and 300 services associated with them. All servers but 2 are running Windows Server 2003. What are the main highlights of PNP4Nagios vs. nagiosgraph, or would I be better off using some sort of tool to convert the data to RRD form and just view it directly in Cacti? Is there a completely different direction I could go that would be even better? Please comment if you need any more information, I tend to be too wordy and tried to keep this question brief. Thanks!

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• IE9 will not navigate to some websites but Google Chrome can

  - by Storchburp

  Was recommended by a friend to ask for help here. I am using Internet Explorer 9. As of two days ago I was suddenly unable to navigate to any part of the following websites: www.computerandvideogames.com www.deviantart.com www.cnet.com However I can still access all of them normally through Google Chrome. I am on a college network but these sites are also accessible through fixed terminals provided by the school and are definitely not blocked. I do not know of any other sites similarly affected. There is no popup, no error message, no diversion to a site telling me I can't access / am blocked etc. I can be on www.google.com and attempt to access these sites through the URL or google search, and my cursor will just show the little moving blue wheel next to the arrow for a couple of seconds, and the page displayed on my browser will not change; ie. not navigating at all. Running antivirus software, changing proxy settings in IE, clearing cookies, unplugging/plugging in computer, restarting PC etc have not changed the situation. Any assistance or advice would be greatly appreciated. Thanks in advance.

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• Dynamically updating DNS records with NSUPDATE fails

  - by Thuy

  I've got my own nameserver ns3.epnddns.com and domain epnddns.com I wanted to try and update the records dynamiclly from home using nsupdate but when I run nsupdate -k Kwww.epnddns.com.+157+17183.key i get the following errors Kwww.epnddns.com.+157+17183.key:1: unknown option 'www.epnddns.com.' Kwww.epnddns.com.+157+17183.key:2: unexpected token near end of the file Kwww.epnddns.com.+157+17183.{private,key}: unexpected token Not sure why I get these errors, I'll post my complete setup. Generated keys on my home pc, using dnssec-keygen -a HMAC-MD5 -b 128 -n HOST www.epnddns.com. created /var/named/ and put the keys there and chmod them to 600. transfered the keys to my nameserver ns3.epnddns.com, created /var/named/ ,put the keys there and chmod them to 600 made dnskey.conf in /var/named and added key www.epnddns.com. { algorithm hmac-md5; secret "my secret from they keys=="; }; chmod to 600 then in /etc/bind/named.conf.local include "/var/named/dnskeys.conf"; zone "epnddns.com" { type master; file "/etc/bind/zones/epnddns.com.zone"; allow-transfer { myhomeip; }; //its my home ip so not in the same network allow-update { key www.epnddns.com.; }; }; I restarted bind without any error messages so it seems to be working on the nameserver at least. But on my homepc when i try and run the nsupdate i get those error messages. Thanks in advance for any help or insightful advice.

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• Can't ping a DNS zone on windows server 2008 R2

  - by Roberto Fernandes

  I´ve just configured a windows server 2008 r2, but got a lot of problems on DNS role. Let me talk about the server configuration: name: fdserver IP address: 192.168.0.10 I have a DNS zone called "fd.local". This is my domain and it´s working ok. I´ve created a zone called fdserver, and inside this zone a record (A) with "*" as a host. because this is a webserver, i´ve configured apache so if you enter something like "site.fdserver" it will point you to the "site" folder. This is working ok ONLY inside the server. This server is a DNS server too... and have 3 entries: 192.168.0.10 (his own IP), 8.8.8.8 and 8.8.4.4 (google public DNS). Now start the problems... Most of the computers on my network, CAN join the domain without problems. But just CAN'T ping "something.fdserver". Now comes the strange thing... If I remove the twoo secondary entries on my DNS server (8.8.8.8 and 8.8.4.4), it obvious stop accessing websites (like microsoft.com), but now the computer CAN ping "something.fdserver". I don´t know If I explained correctly... and my English is terrible... but inside the server is all working as it supposed to work. But in the workstation machines, it work only if I remove the secondary DNS!! If you need any details, just ask! thanks!

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• Cannot access host from a virtualbox guest using bridged adapter

  - by David Dai

  I have a windows 7 host with firewall turned off. And I have a windowsXP guest running on Virtualbox 4.2.4r81684. In my windowsXP guest I tried to connect to the FTP server on my host machine(which used to work well) but it didn't work. I tried to ping my host machine, but it didn't work either. Then I tried to ping my guest from host, it worked well. my guest ip is :192.168.1.95 my host ip is : 192.168.1.9 route table on guest machine is this: C:\Documents and Settings\wenlong>route PRINT =========================================================================== Interface List 0x1 ........................... MS TCP Loopback interface 0x2 ...08 00 27 66 54 6c ...... AMD PCNET Family PCI Ethernet Adapter #2 - Packe t Scheduler Miniport =========================================================================== =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.95 20 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1 192.168.1.0 255.255.255.0 192.168.1.95 192.168.1.95 20 192.168.1.95 255.255.255.255 127.0.0.1 127.0.0.1 20 192.168.1.255 255.255.255.255 192.168.1.95 192.168.1.95 20 224.0.0.0 240.0.0.0 192.168.1.95 192.168.1.95 20 255.255.255.255 255.255.255.255 192.168.1.95 192.168.1.95 1 Default Gateway: 192.168.1.1 =========================================================================== Persistent Routes: None arp cache is this: C:\Documents and Settings\wenlong>arp -a Interface: 192.168.1.95 --- 0x2 Internet Address Physical Address Type 192.168.1.1 00-26-f2-60-3c-04 dynamic 192.168.1.9 90-e6-ba-c2-90-2f dynamic It's strange because there was no problem days before and I didn't make any changes to the setting. could anybody help? PS. the guest can communicate with other machines in the LAN(for example 192.168.1.114) ok. it just cannot connect to the host machine.

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• Windows 7 Media Center PC not displaying MKV files properly

  - by David

  Does anyone know why Windows Media Center wouldn't correctly display a 16x9 video? I just upgraded my home-built HTPC from Vista Ultimate (hey, it was a giveaway) to Windows 7 Ultimate - clean install. After that, I installed the Divx7 beta (to get .MKV support) and AC3filter (so I could HEAR the MKV files). Previously, under Vista Ultimate (32 bit), I had Arcsoft's Total Theater Pro for playing Blu-Rays and MKV decoding under Media Center. Now when I play a 720p 16x9 MKV file, I get some 'letterboxing' - like it's halfway between 4x3 and 16x9 - with the aspect ration looking alightly squished as a result. Here's the wierd part. If I use the Media Center connection software in my XBox 360 - it plays perfectly, filling the 16x9 screen edge-to-edge, just like Vista's WMC software USED to. Of course, beats the network up because the XBox goes to the HTPC, the HTPC goes to my WHS machine to fetch the data, it comes back to the HTPC, gets transcoded and streamed back to the Xbox. I'm running the latest drivers for an NVidia card (as fetched by Windows 7). I have no idea WHY this is because if I play "ordinary" (i.s. SD) Divx files that are 16x9, they play just fine, scaled right up to my screen's edges. It puzzles me as to why the same machine that properly converts the bits for the Xbox can't display/scale them properly for the attached display. Mind you, Windows Media Player exhibits the same symptoms. Ideas?

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• SQL Server restore a backup results in an error.

  - by Mario

  I have a database in dev (SQL Server 2005 on Windows Server 2008) that I need to move to prod (SQL Server 2000 on Windows Server 2003). My process is as follows: Login to dev, open SQL Server Management Studio Right click on the database | Tasks | Backup. Keep all default options (full backup etc.) Move .bak file locally to prod (no network drive), login to prod, open SQL Server Enterprise Manager. Right click Databases node | All Tasks | Restore database. Change Restore as database to reflect the same database name. Click radio button 'From device'. Click 'Select Devices' Click Restore from: Add..., browse to .bak file (small - only 6mb) Now I am ready to restore the database, so I click OK and get the following error: "The media family on device 'E:...bak' is incorrectly formed. SQL Server cannot process this media family. RESTORE DATABASE is terminating abnormally." This error is immediate. I have tried a few different variations of this - restoring the db to dev machine with a different db name and log file names (where it originated), creating an empty database with the same physical path to files before and trying to restore to that, making a few different .bak files and making sure they are verified before uploading them to prod. I know for a fact the directory for the .mdf and .ldf files exist on prod, though the files themselves don't exist. If, before I click OK to restore, go to the options tab instead I get the following error: Error 3241: The media family on device 'E:...bak' is incorrectly formed. SQL Server cannot process this media family. RESTORE FILELIST is terminating abnormally. Anyone have any bright ideas?

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• How to configure TFTPD32 to ignore non PXE DHCP requests?

  - by Ingmar Hupp

  I want to give our Windows guy a way of easily PXE booting machines for deployment by plugging his laptop into one of our site networks. I've set up a TFTPD32 configuration which does just that, and our normal DHCP server ignores the PXE DHCP requests due to them having some magic flag, so this part works as desired. However I'm not sure how to configure TFTPD32 to only respond to PXE DHCP requests (the ones with the magic flag) and ignore all normal DHCP requests (so that the production machines don't get a non-routed address from the PXE server). How do I configured TFTPD32 to ignore these non-PXE DHCP requests? Or if it can't, is there another equally easy to use piece of software that he can run on his Windows laptop? Since the TFTPD part is working fine, a DHCP server with the ability to serve PXE only would do. Worst case I'll have to set up a virtual machine with all this, but I'd much prefer a small, simple solution. I'm not interested in solutions that involve using the existing DHCP servers or separating machines on the network for deployment, the whole point is to be simple and stand-alone.

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• How do I make dnsmasq serve IP addresses via IPoIB?

  - by Matt

  I have a cluster farm that I'm setting up. The nodes (computers in the farm) are connected via ethernet & IP over Infiniband. I'm needing to netboot the nodes and thought dnsmasq would fit well as it provides all the features including support for DHCP over IB and it works great for our ethernet setup. However, I can't seem to get it to provide IP addresses to the infiniband adaptors on the nodes. Each node is running an Ubuntu desktop 12.04 LTS. The dnsmasq server is running on ubuntu server 12.04LTS and has the following test config: dhcp-authoritative domain-needed bogus-priv expand-hosts no-hosts domain=local dhcp-range=eth0,10.0.0.10,10.0.0.255,12h dhcp-option=eth0,3,10.0.0.1 dhcp-range=ib0,10.1.1.10,10.1.1.255,12h dhcp-option=ib0,3,10.1.1.1 log-queries log-dhcp IPoIB works between nodes when configured statically but not with dhcp. On the nodes the file /etc/network/interfaces contains auto lo iface lo inet loopback auto ib0 iface ib0 inet dhcp #iface ib0 inet static #address 10.1.1.5 #netmask 255.0.0.0 up echo connected >`find /sys -name mode | grep ib0` Is there something I need to do on the client or server end to make this work?

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