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• Need a place to store a few bytes of meta information on storage media

  - by Jason C

  I'm working on an embedded project. I need a place to store some filesystem-independent meta information on a storage device. The device has an MSDOS partition table. The device also may have unallocated space (depending on its size) but it will be TRIMmed (and also may be blown away by new partitions in the future). I need a location on the device that is not unallocated and that has a low risk of being touched (outside of completely erasing the device). The device is only guaranteed to have an MBR at the point the meta data needs to first be written; meaning there are no EBRs/VBRs present that I could use. There are 446 bytes at the very start of the device available for MBR bootstrap code. Currently my only idea is to store data at the end of this block. However, the device is bootable and I have no way of knowing if I'd be blowing away bootstrap code or not. The sector size is 512 bytes and the MBR is the first sector, I'm pretty sure (correct me if I'm wrong) that that means the second sector is available for use by partition data, so I can't use that either. Does anybody have any ideas? I need 4 bytes of space.

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• Denying access to website via htaccess based on http header

  - by neekster

  I've been trying for ages to get this to work and I can't put my finger on it. What I'm trying to do is block access to a site from a number of countries, based on the CF-IPCountry header added by CloudFlare. I figured htaccess was a suitable way to do this. We are running LiteSpeed 4.2.4 on top of DirectAdmin for a control panel. The problem we having is the htaccess rule doesn't seem to do anything. Here's the rule we tried: SetEnvIf CF-IPCountry AU UnwantedCountry=1 Order allow,deny Deny from env=UnwantedCountry Allow from all That makes no difference at all, connections are still accepted. Just to check that the rule was at least being processed, I changed Allow from all to Deny from all, and connections were refused. So it appears to be a problem wit the variable. Here's the relevant headers that come in with the request. Connection: Keep-Alive Accept-Encoding: gzip CF-Connecting-IP: xx.xx.xx.xx CF-IPCountry: AU X-Forwarded-For: xx.xx.xx.xx.xx CF-RAY: c9062956e2d04b6 X-Forwarded-Proto: http CF-Visitor: {"scheme":"http"} Zone-Name: xx.com.au Hopefully someone can help me out, this has been driving me nuts for too long. Thanks

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• How can I implement ansible with per-host passwords, securely?

  - by supervacuo

  I would like to use ansible to manage a group of existing servers. I have created an ansible_hosts file, and tested successfully (with the -K option) with commands that only target a single host ansible -i ansible_hosts host1 --sudo -K # + commands ... My problem now is that the user passwords on each host are different, but I can't find a way of handling this in Ansible. Using -K, I am only prompted for a single sudo password up-front, which then seems to be tried for all subsequent hosts without prompting: host1 | ... host2 | FAILED => Incorrect sudo password host3 | FAILED => Incorrect sudo password host4 | FAILED => Incorrect sudo password host5 | FAILED => Incorrect sudo password Research so far: a StackOverflow question with one incorrect answer ("use -K") and one response by the author saying "Found out I needed passwordless sudo" the Ansible docs, which say "Use of passwordless sudo makes things easier to automate, but it’s not required." (emphasis mine) this security StackExchange question which takes it as read that NOPASSWD is required article "Scalable and Understandable Provisioning..." which says: "running sudo may require typing a password, which is a sure way of blocking Ansible forever. A simple fix is to run visudo on the target host, and make sure that the user Ansible will use to login does not have to type a password" article "Basic Ansible Playbooks", which says "Ansible could log into the target server as root and avoid the need for sudo, or let the ansible user have sudo without a password, but the thought of doing either makes my spleen threaten to leap up my gullet and block my windpipe, so I don’t" My thoughts exactly, but then how to extend beyond a single server? ansible issue #1227, "Ansible should ask for sudo password for all users in a playbook", which was closed a year ago by mpdehaan with the comment "Haven't seen much demand for this, I think most people are sudoing from only one user account or using keys most of the time." So... how are people using Ansible in situations like these? Setting NOPASSWD in /etc/sudoers, reusing password across hosts or enabling root SSH login all seem rather drastic reductions in security.

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• Unable to mount root fs over NFS [on hold]

  - by johnmadrak

  I am attempting to set up a Raspberry Pi running Pidora to boot from an NFS share. My configuration in cmdline.txt is: dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=/dev/nfs nfsroot=<serverip>:/fake/path,nfsvers=3,rw,nolock nfsrootdebug ip=dhcp elevator=deadline rootwait On the Pi, the output I see is: IP-Config: Got DHCP answer from <router>, my address is <clientip> IP-Config: Complete: device=eth0, hwaddr=<macaddress>, ipaddr=<clientip>, mask=255.255.255.0, gw=<routerip> host=<clientip>, domain=, nis-domain=(none) bootserver=<routerip>, rootserver=<serverip>, rootpath= nameserver0=<routerip> (It pauses for a bit here) VFS: Unable to mount root fs via NFS, trying floppy VFS: Cannot open root device "nfs" or unknown-block(2,0); error -6 Please append a correct "root=" boot option; here are the available partitions: ..... On the NFS Server (an OpenVZ Container), the output I see in the /var/log/messages is: Aug 22 23:24:01 vps-4178 rpc.mountd[928]: authenticated mount request from <clientip>:783 for /fake/path (/fake/path) Aug 22 23:24:38 vps-4178 rpc.mountd[928]: authenticated mount request from <clientip>:741 for /fake/path (/fake/path) Aug 22 23:25:25 vps-4178 rpc.mountd[928]: authenticated mount request from <clientip>:752 for /fake/path (/fake/path) Aug 22 23:26:12 vps-4178 rpc.mountd[928]: authenticated mount request from <clientip>:876 for /fake/path (/fake/path) To test, I've made sure I can mount (non-root) from both the Pi and another machine and it worked. Does anyone have an idea on what could be wrong or how to narrow it down? Thank you in advanced for your help.

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• Windows file association for README, INSTALL, LICENSE and the like [closed]

  - by Lumi

  Possible Duplicate: How to set the default program for opening files without an extension in Windows? Many files originating in the UNIX world come without file extension. Popular examples include README, INSTALL, LICENSE. We know for a fact that these are text files. It is therefore a bit disappointing not to be able to just double-click them open in Explorer and see them in Notepad (actually, Notepad2 because of the UNIX line endings which silly Microsoft Notepad doesn't render correctly). Does anyone know of a way to create a file association for, say, README files without extension? This could then be replicated to cover the most frequently occurring file types, and then double-clicking them open would work. Update (Sort of in response to all your comments.) Thanks, folks, your comments and answers have helped me. @Indrek, yes, I was under the assumption that you could somehow create an association for just README or Makefile, and couldn't do so for files without extension. Turns out the contrary is true, and yes, that is a workaround that neatly solves the issue. Ultimately, I just want to be able to double-click to open a README or Makefile, that's all. @Sampo, the SendMe trick is also useful, although usability is not as great as a straight double-click. (I'm really lazy sometimes.) Turns out the following trick using ftype and ftype from an Administrator prompt does the double-click enabling job: assoc .=no_ext ftype no_ext=%SystemRoot%\system32\NOTEPAD.EXE %1 :: You can see it created some entries in the registry: reg query hkcr\no_ext /s reg query hkcr\. /s

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• Apache directory authorization bug (clicking cancel gives acces to partial content)

  - by s4uadmin

  I got a minor problem (as the site is not high priority) but still a very interesting one. I have an apache root domain wherein other sites live "/var/www/" And I have foo.example.com forwarding to "/var/www/foo-example" (wordpress site) The problem here is that when you go to foo.example.com you are prompted to enter credentials. If you hit cancel it gives you the access denied page. But when you go to the servers' direct IP (this gives you the default index page) and hit cancel when prompted for credentials it just keeps giving you the login screen, and after pressing cancel a few times more it gives (a perhaps cached) bare html part of the page. How do I prevent this from happening? Perhaps this is a bug... Even if I would block access to the root directory when going to the ip/foo-example it would still do this. And I want to keep all the directories within the www directory or at least all in the same. Thanks PS: here is my configuration: <VirtualHost *:80> DocumentRoot /var/www/wp-xxxxxxx/ ServerName beta.xxxxxxxxx.nl <Directory "/var/www/wp-xxxxxxxxx/"> Options +Indexes AuthName "xxxxxxxx Beta Site" AuthType Basic require valid-user Satisfy all AuthBasicProvider file AuthUserFile /var/www/wp-xxxxxxx/.htxxxxxxxxx order deny,allow allow from all </Directory> ServerAdmin [email protected] ServerAlias beta.xxxxxxx.nl </VirtualHost>

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• Bad performance with Linux software RAID5 and LUKS encryption

  - by Philipp Wendler

  I have set up a Linux software RAID5 on three hard drives and want to encrypt it with cryptsetup/LUKS. My tests showed that the encryption leads to a massive performance decrease that I cannot explain. The RAID5 is able to write 187 MB/s [1] without encryption. With encryption on top of it, write speed is down to about 40 MB/s. The RAID has a chunk size of 512K and a write intent bitmap. I used -c aes-xts-plain -s 512 --align-payload=2048 as the parameters for cryptsetup luksFormat, so the payload should be aligned to 2048 blocks of 512 bytes (i.e., 1MB). cryptsetup luksDump shows a payload offset of 4096. So I think the alignment is correct and fits to the RAID chunk size. The CPU is not the bottleneck, as it has hardware support for AES (aesni_intel). If I write on another drive (an SSD with LVM) that is also encrypted, I do have a write speed of 150 MB/s. top shows that the CPU usage is indeed very low, only the RAID5 xor takes 14%. I also tried putting a filesystem (ext4) directly on the unencrypted RAID so see if the layering is problem. The filesystem decreases the performance a little bit as expected, but by far not that much (write speed varying, but 100 MB/s). Summary: Disks + RAID5: good Disks + RAID5 + ext4: good Disks + RAID5 + encryption: bad SSD + encryption + LVM + ext4: good The read performance is not affected by the encryption, it is 207 MB/s without and 205 MB/s with encryption (also showing that CPU power is not the problem). What can I do to improve the write performance of the encrypted RAID? [1] All speed measurements were done with several runs of dd if=/dev/zero of=DEV bs=100M count=100 (i.e., writing 10G in blocks of 100M). Edit: If this helps: I'm using Ubuntu 11.04 64bit with Linux 2.6.38. Edit2: The performance stays approximately the same if I pass a block size of 4KB, 1MB or 10MB to dd.

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• creating a backup system with freenas

  - by masfenix

  We are currently in the process of opening a new accounting firm in the new year (actually moving from our previous location). I am looking for a cheap/free solution to back up our files (small, text files couple of kb). I was impressed with FreeNas and Windows Backup but I found out that Windows Backup only saves for a maximum of 2 years. The work machines will be running Windows 8 or Windows 7. There can be many work machines however we have only one to start with (ie, think of it as just one employee). I have an old core 2 duo with 2 gigs of ram that I can convert to a server if need be. I want the syncing to be done through LAN since the data is confidential and should never touch the outside world. So ideally, I would like the following scenario: A skydrive/dropbox like service to sync my client files over work machines and a central server. The "server" part should store history of files (i don't know how this will be done since the file will have the same name?). This isn't really necessary, but I can see it become useful. I am not familiar with RAID, so does any software RAID solution exist? I will most likely be buying 2 hard drives.

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• SVN checkout returns 400 error

  - by eboix

  I'm trying to download the http://code.opencv.org/svn/opencv/trunk/ repository of all of the OpenCV source code - as specified in an OpenCV installation tutorial. In the tutorial, the repository https://code.ros.org/svn/opencv/trunk/ is used, but they moved it to http://code.opencv.org/svn/opencv/trunk/, and now you need a password to access the code.ros.org repository. Anyway, I'm using TortoiseSVN to download the SVN repository. (I get the same error with http://sourceforge.net/projects/win32svn/) I get this: Checkout from http://code.opencv.org/svn/opencv/trunk, revision HEAD, Fully recursive, Externals included Server sent unexpected return value (400 Bad request. Method Unknown) in response to REPORT request for '/svn/opencv/!svn/vcc/default' On the TortoiseSVN site I found something about this 400 error: You're behind a firewall which blocks DAV requests. Most firewalls do that. Either ask your Administrator to change the firewall, or access the repository with https:// instead of http:// like in https://svn.collab.net/repos/svn/ That way you connect to the repository with SSL encryption, which firewalls can't interfere with (if they don't block the SSL port completely). Also some virus scanners (i.e. Kapersky) are known to interfere and cause this error. The code.ros.org repository is https://, so I would be able to access it, but I need a password, so I can't. I made an account on ros.org, but it seems that I still need a password (which I don't know) to access the code repository. My username-password combination does not work. I unblocked all of the TortoiseSVN programs in my firewall settings. Nothing changed. I temporarily stopped my firewall to see if it was interfering with my request. I got the same error. How can I do an svn checkout http://code.opencv.org/svn/opencv/trunk/opencv/ so that I don't get this error? Is there any way to make it https://? Any help would be appreciated!

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• Simplest DNS solution for remote offices

  - by dunxd

  I look after a bunch of remote offices that connect via VPN - a Cisco ASA 5505 in each office acts as Firewall and VPN end point. Beyond that we keep things as simple as possible in the offices to minimise the support burden. We don't have any kind of server except in offices large enough to justify having someone dedicated to IT. Basically there is the ASA, some computers, a network printer and a switch. One of the problems I am seeing in a lot of offices is that DNS requests looking up hosts inside our network often fail - I'm assuming timeouts due to the offices internet connection (they are all in developing world countries) having some sub-optimal qualities (e.g. high latency caused by VSAT segments, or packet loss. The obvious solution to this is to have some sort of local DNS service that can serve local requests - so I think it would need to do zone transfers from our Microsoft Windows 2008 R2 DNS servers at HQ. However, simply installing Windows Servers in each office is both expensive, and creates a support burden. This got me thinking about pfsense/m0n0wall on embedded devices - those can act as a DNS server, and could be configured at HQ and sent out as just something that needs to be plugged into the network and can then be forgotten about by the staff locally. Maybe there are some alternatives to the ASA 5505 that include some DNS functionality. Has anyone here dealt with the problem, either using some kind of embedded device, or found some other solution? Any gotchas or reasons to avoid what I have suggested?

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• Iptables rules, forward between two interfaces

  - by Marco

  i have a some difficulties in configuring my ubuntu server firewall ... my situation is this: eth0 - internet eth1 - lan1 eth2 - lan2 I want that clients from lan1 can't communicate with clients from lan2, except for some specific services. E.g. i want that clients in lan1 can ssh into client in lan2, but only that. Any other comunication is forbidden. So, i add this rules to iptables: #Block all traffic between lan, but permit traffic to internet iptables -I FORWARD -i eth1 -o ! eth0 -j DROP iptables -I FORWARD -i eth2 -o ! eth0 -j DROP # Accept ssh traffic from lan1 to client 192.168.20.2 in lan2 iptables -A FORWARD -i eth1 -o eth2 -p tcp --dport 22 -d 192.168.20.2 -j ACCEPT This didn't works. Doing iptables -L FORWARD -v i see: Chain FORWARD (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 33 144 DROP all -- eth1 !eth0 anywhere anywhere 0 0 DROP all -- eth2 !eth0 anywhere anywhere 23630 20M ACCEPT all -- any any anywhere anywhere state RELATED,ESTABLISHED 0 0 ACCEPT all -- eth1 any anywhere anywhere 175 9957 ACCEPT all -- eth1 any anywhere anywhere 107 6420 ACCEPT all -- eth2 any anywhere anywhere 0 0 ACCEPT all -- pptp+ any anywhere anywhere 0 0 ACCEPT all -- tun+ any anywhere anywhere 0 0 ACCEPT tcp -- eth1 eth2 anywhere server2.lan tcp dpt:ssh All packets are dropped, and the count of packets for the last rule is 0 ... How i have to modify my configuration? Thank you. Regards Marco

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• PHP 5.3.2 Upgrade on Windows

  - by mcondiff

  I have a development box running Windows XP, Apache 2.2.15 Mysql and PHP 5.2.6 About a month ago I updated the Apache to the latest version and it went swimmingly. I am not having the same success with upgrading PHP to the latest version. I backed up my PHP directory and then deleted it. Used the Windows Installer for PHP 5.3.2, installed as an Apache 2.2.X module. I can get "Hello World" and phpinfo() to come up but cannot get mysql to connect. I have the extension un-commented in the php.ini and shouldn't really have to touch the Apache httpd.conf file since I didn't change the directory of PHP. Not sure what I'm doing wrong here. I have to get this right and then upgrade the Live Server too so I want to get this down pat. I've tried to use installation guides on the web with no luck. Any info pertaining to this problem would be great. I'm also afraid that the other PHP modules may not load but cannot really tell anything past mysql not working.

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• Setting up port forwarding for web server

  - by Javier Badia

  This could belong on Super User, but I thought this place was more appropiate. I want to run Apache in my computer and want to make it available to the outside world to test a couple things. Apparently, I have to go into my router's (a TP-LINK TD 8910G) settings and forward port 80 to my PC's IP. So far so good. Thing is, since the router uses a web based interface and it's kind of stupid, it told me that since I was using port 80 for this, I should access its settings through port 8080. Maybe it can't detect requests coming from the LAN, I don't know. Point is, now neither port can't access the configuration, and I can't access Internet. Specifically, trying to access anything (including 192.168.1.1, the router's settings) through port 80 turns up a blank page (maybe if I had the server running in my computer I'd get something, but I don't want to risk trying, I had to reset the router and restore the settings), and port 8080 gives a "Can't establish connection" error in Firefox (and similar ones in other browsers). Is there a way to configure the router to not redirect requests coming from inside the network? I'm a beginner with this stuff, so please try to explain in a simple way. If this is more appropiate in Super User, I'm sorry.

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• postfix - connection refused from behind NAT

  - by manchine

  When attempting to telnet postfix from a different host in the same LAN through the FQDN (and thus the LAN's public IP), the following error occurs: root@mailer:/var/log# telnet mail.domain.com 25 Trying 1.2.3.4... telnet: Unable to connect to remote host: Connection refused Other services can be reached from the exact same host, however: root@mailer:/var/log# telnet mail.domain.com 22 Trying 1.2.3.4... Connected to mail.domain.com. Escape character is '^]'. SSH-2.0-OpenSSH_6.0p1 Debian-4+deb7u1 To make matters more intriguing, Postfix can be accessed from outside the LAN: nunos-mbp:mailog nzimas$ telnet mail.domain.com 25 Trying 1.2.3.4... Connected to mail.domain.com. Escape character is '^]'. 220 mail.domain.com ESMTP Postfix (Ubuntu) To sum thing up: a) Postfix (running on 10.10.10.4 / mail.domiain.com) refuses connection from a host in the same LAN (10.10.10.2), but only when queried through the FQDN (mail.domain.com) b) mail.domain.com accepts connections to other services (but Postfix) from 10.10.10.2 c) mail.domain.com accepts connections to all services, including Postfix, from the outside world If it were a firewall issue, then I believe it would not be possible to connect to any service from 10.10.10.2 through the FQSN / public IP. It ought to be some missing parameter in Postfix, although I haven't found any clear pointers so far.

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• How to access previous VHD versions of system backup?

  - by feklee

  Quote from the 31 Oct 2009 TechNet article "Learn more about system image backup": During the first backup, the backup engine scans the source drive and copies only blocks that contain data into a .vhd file stored on the target, creating a compact view of the source drive. The next time a system image is created, only new and changed data is written to the .vhd file, and old data on the same block is moved out of the VHD and into the shadow copy storage area. Volume Shadow Copy Service is used to compute the changed data between backups, as well as to handle the process of moving the old data out to the shadow copy area on the target. This approach makes the backup fast (since only changed blocks are backed up) and efficient (since data is stored in a compact manner). When restoring the image, blocks will be restored to their original locations on the source disk. If you want to restore from an older backup, the engine reads from the shadow copy area and restores the appropriate blocks. For the last days, a daily system backup of drive C: to drive E: has been scheduled and run by Windows 7 Backup and Restore. Drive C: currently holds 233 GB of data, which fits comfortably on drive E:, a 1 TB drive, with 727 GB of free space remaining. How do I access the previous version of a VHD? I right clicked on files and folders in E:\WindowsImageBackup, and I looked for Previous Versions but always: There are no previous versions available

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• How can I safely close this window and forever avoid seeing similar pop-ups from Mackeeper Zeobit's malware and spyware?

  - by Michael Prescott

  The attached image shows a window that just popped up and the only button available is the OK button. I could Force quit Safari, but I've got several sites open right now and don't want to try and find my place again. Besides, I've seen similar hacks in the past and I'd like to learn how to handle them in a way better than just a brute force-quit. I've never heard of MacKeeper or Zeobit, so I opened Firefox and did a few searches while Safari is obviously still stuck, waiting for me to click the sneaky OK button in the dialog window. Anyhow, at least the first few pages of most search results contain lots of blabbering from questionable witnesses about how MacKeeper saved them from some malware or spyware. However, any company that is hacking the browser to maliciously install their product is itself the criminal and not providing a true security application. So, there are three questions here: How can I close this window? Can I do something to Safari to avoid these hacks in the future? (Just curious) Is MacKeeper or Zeobit somehow loading the search results so that no information about their application being malware or spyware is listed (I can't be the only person in the world that is offended by their tactics, even though it appears I am)?

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• Single m0n0wall - Two LAN Subnets - How To Setup

  - by SnAzBaZ

  I have two LAN subnets that I need to link together they are 192.168.4.0/24 and 192.168.5.0/24 There is a m0n0wall running on 192.168.4.1. It's LAN connection goes out to our network switch, and it's WAN port goes out to our ADSL modem. WAN is connected via PPPoE. The 192.168.4.0 subnet contains all of our office workstations. The 192.168.5.0 subnet contains development servers and test machines that need to obtain internet access and be "managed" by computers on the 192.168.4.0 subnet, but need to be on their own subnet as well. I have a Draytek 2820N configured on 192.168.5.1 with it's WAN2 port configured as 192.168.4.25 and a default gateway of 192.168.4.1. Machines on the 5.0 subnet can connect to the internet via the m0n0wall just fine. I configured a static route on the m0n0wall LAN interface, Network 192.168.5.0/24 and Gateway 192.168.4.25. Machines on the 5.0 subnet can ping machines on the 4.0 network but the reverse does not work. I configured a new firewall rule on the m0n0wall that allows any traffic on the LAN interface with a source IP of 192.168.4.25 to be allowed. The DrayTek firewall is currently configured to pass all traffic regardless. When I try to ping a machine in the 5.0 subnet from 4.0 I see this in my m0n0wall log: BLOCK 14:45:27.888157 LAN 192.168.4.25 192.168.4.37, type echoreply/0 ICMP So the reply is being sent from the 5.0 subnet but is not being allowed to reach my workstation because the firewall is blocking it. Why is the firewall blocking it ? I hope the explanation of my network is clear, please ask if you require further clarification. Thank you.

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• What's going on with traceroute?

  - by Kevin

  The following is what happens when I run traceroute from a certain location: # traceroute google.com traceroute to google.com (74.125.227.39), 30 hops max, 60 byte packets 1 gateway.local.enactpc.com (10.0.0.1) 0.138 ms 0.101 ms 0.084 ms 2 * * * 3 * * * 4 * * * 5 * * * 6 * * * 7 * * * 8 * * * 9 * * * 10 * * * 11 * * * 12 * * * 13 * * * 14 * * * 15 * * * 16 * * * 17 * * * 18 * * * 19 * * * 20 * * * 21 * * * 22 * * * 23 * * * 24 * * * 25 * * * 26 * * * 27 * * * 28 * * * 29 * * * 30 * * * Absolutely nothing of interest... Now, originally I thought this was just a fact of the location's network set up. (I assume they block pings or something...) However, watch what happens when I use nmap to run a traceroute... # nmap -sP --traceroute google.com Starting Nmap 5.21 ( http://nmap.org ) at 2012-09-25 22:18 CDT Nmap scan report for google.com (74.125.227.40) Host is up (0.034s latency). Hostname google.com resolves to 11 IPs. Only scanned 74.125.227.40 rDNS record for 74.125.227.40: dfw06s06-in-f8.1e100.net TRACEROUTE (using proto 1/icmp) HOP RTT ADDRESS 1 0.19 ms gateway.local.enactpc.com (10.0.0.1) 2 1.93 ms 99-20-92-1.lightspeed.austtx.sbcglobal.net (99.20.92.1) 3 25.61 ms 99-20-92-2.lightspeed.austtx.sbcglobal.net (99.20.92.2) 4 ... 6 7 23.68 ms 12.83.68.137 8 31.30 ms gar23.dlstx.ip.att.net (12.122.85.73) 9 ... 10 31.82 ms 72.14.233.65 11 32.27 ms 209.85.250.77 12 32.98 ms dfw06s06-in-f8.1e100.net (74.125.227.40) Nmap done: 1 IP address (1 host up) scanned in 3.29 seconds When using nmap I get A LOT more results than with traceroute, why? Note, I checked, and the difference in target IP addresses is not related...

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• Vlan on DD-WRT v24 filesharing without internet

  - by user148888

  I'm planning to do a vlan with shared files without internet. my vlan is working correctly until I could lock the internet but I can not share files only I can ping from 172.168.1.x to 172.168.2.x but not backward. can u help me please?? This is my config. WRT54g DD-wrt v24 vlan0 eth 1,2,3 172.168.1.1/24 vlan1 Wan vlan2 eth 4 172.168.2.1/24(don't want internet here just Lan Conection) Pc (my pc) 172.168.1.10/24 gtway 172.168.1.1 (with internet) Ubiquity Nanostation loco M2 172.168.2.20/24(AP)(connect to eth 4 vlan2)(don't want internet here) Ubiquity Nanostation loco M2 172.168.2.21/24(Client)(don't want internet here) Friend pc 172.168.2.115/24(connected from the client)(don't want internet here) Any Help Please.. ![Lan Map][1] ![Vlan Config1][2] ![Vlan Config2][3] ![Vlan Config3][4] ![Command to block internet][5] [url=http://imageshack.us/photo/my-images/194/lanxl.jpg/][img=http://imageshack.us/a/img194/4197/lanxl.th.jpg][/url] [url=http://imageshack.us/photo/my-images/600/commandmf.jpg/][img=http://imageshack.us/a/img600/9530/commandmf.th.jpg][/url] [url=http://imageshack.us/photo/my-images/811/57398524.jpg/][img=http://imageshack.us/a/img811/1917/57398524.th.jpg][/url] [url=http://imageshack.us/photo/my-images/717/48064277.jpg/][img=http://imageshack.us/a/img717/829/48064277.th.jpg][/url] [url=http://imageshack.us/photo/my-images/685/21456517.jpg/][img=http://imageshack.us/a/img685/256/21456517.th.jpg][/url]

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• installing mod_wsgi giving 403 error

  - by John Smiith

  installing mod_wsgi giving 403 error httpd.conf i added code below WSGIScriptAlias /wsgi "C:/xampp/www/htdocs/wsgi_app/wsgi_handler.py" <Directory "C:/xampp/www/htdocs/wsgi_app/"> AllowOverride None Options None Order deny,allow Allow from all </Directory> wsgi_handler.py status = ‘200 OK’ output = ‘Hello World!’ response_headers = [('Content-type', 'text/plain'), ('Content-Length', str(len(output)))] start_response(status, response_headers) return [output] Note: localhost is my virtual host domain and it is working fine but when i request http://localhost/wsgi/ got 403 error. <VirtualHost *:80> ServerAdmin [email protected] DocumentRoot "C:/xampp/www/htdocs/localhost" ServerName localhost ServerAlias www.localhost ErrorLog "logs/localhost-error.log" CustomLog "logs/localhost-access.log" combined </VirtualHost> Error log [Wed Jul 04 06:01:54 2012] [error] [client 127.0.0.1] File does not exist: C:/xampp/www/htdocs/localhost/favicon.ico [Wed Jul 04 06:01:54 2012] [error] [client 127.0.0.1] client denied by server configuration: C:/xampp/Bin/apache [Wed Jul 04 06:01:58 2012] [error] [client 127.0.0.1] Options ExecCGI is off in this directory: C:/xampp/www/htdocs/wsgi_app/wsgi_handler.py [Wed Jul 04 06:01:58 2012] [error] [client 127.0.0.1] client denied by server configuration: C:/xampp/Bin/apache [Wed Jul 04 06:01:58 2012] [error] [client 127.0.0.1] File does not exist: C:/xampp/www/htdocs/localhost/favicon.ico [Wed Jul 04 06:01:58 2012] [error] [client 127.0.0.1] client denied by server configuration: C:/xampp/Bin/apache Note: My apache is not in c:/xampp/bin/apache it is in c:/xampp/bin/server-apache/

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• Are there any tests I can run on a network to simulate 100 heavy network users?

  - by marc.gayle

  I will be hosting a Ruby on Rails workshop at a small hotel in the near future, and while they have 'Wifi' everywhere on the property, and the property normally hosts 150 - 300 people, I am not 100% confident that they have hosted 150 tech people that tend to have heavy web surfing habits/needs. Their tech department is also 1 or 2 guys. Are there any automated tests I can download and run from my laptop, on the network, that would simulate 100 'heavy users' on the network at the same time? Their broadband pipe is a 15mbps cable connection. Would that suffice for the general surfing needs of 100 - 150 techies? I know all it takes is 1 or 2 bit torrenters to kill the entire network, but assuming we can at the very least block those ports or encourage the attendees not to file share on the network, would that speed suffice for general surfing needs? What are good resources online that would allow me to quickly get up to speed on the IT related issues, so that I can ask their sysadmins the right questions? Edit: Note that I am fairly technical, so assume I can get up to speed quickly even with technical manuals, etc.

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• Using udev to create a character device based on a driver being loaded

  - by SteveCB

  I'm in the process of setting up RAID monitoring for a number of Dell servers that use the PERC 6i integrated card. We're using Nagios at present and the check_megasasctl plugin seems to fit the bill. However, the plugin relies upon the existence of: /dev/megaraid_sas_ioctl_node This device node doesn't exist by default, you have to create it by hand using something like: mknod /dev/megaraid_sas_ioctl_node c 253 0 Now, to make the existence of this device node persistent across reboots, I thought I could write a udev rule, but as usual, I'm missing something. I thought I could create a file such as /etc/udev/rules.d/10-local/rules that contained: DRIVER=="megasas" NAME="megaraid_sas_ioctl_node" MODE="0600" But this doesn't work - no device node after a reboot. Dmesg output indicates the megasas driver is loaded and functional: megasas: 00.00.04.01-RH1 Thu July 10 09:41:51 PST 2008 megasas: 0x1000:0x0060:0x1028:0x1f0c: bus 1:slot 0:func 0 megasas: FW now in Ready state Further, I don't see any means to instruct udev on which type of device node to create: character or block. I suspect I'm failing to understand exactly how udev is meant to work. I realise I could just cheat and run MegaCLI in /etc/rc.local, redirecting output to /dev/null; it creates the megaraid_sas_ioctl_node device node as part of its execution. I just thought using udev rules would be a) cleaner and b) a useful learning exercise. Perhaps I should just dump the above mknod command in /etc/rc.local... So how do I get udev to create the /dev/megaraid_sas_ioctl_node device node based on the presence of the megasas driver? Cheers Steve

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• Using wildcard domains to serve images without http blocking

  - by iopener

  I read that browsers sometimes block waiting for multiple images from the same host, and I'm trying to do everything I can to speed up page load times. One caveat: I need to serve files over HTTPS. Any opinions about whether this is feasible: Setup a wildcard cert for *.domain.com. Whenever I need an image, generate an number based on a hash mod 5 of the filename, and append it to an 'img' subdomain (eg img1.domain.com, img4.domain.com, img3.domain.com, etc.); the hash will make any filename always use the same subdomain, and therefore the browser should be able to cache the images Configure a dynamic virtualhost record to point all img#. subdomains to /var/www/img I am looking for feedback about this plan. My concerns are: Will I get warnings when my page has https:// links to multiple subdomains? Is the dynamic virtualhost record I'm talking about even possible? Considering the amount of processing this would require, is it likely to even produce any kind of overall benefit? I'm probably averaging a half-dozen images per page, with only half being changed on each page refresh. Thanks in advance for you feedback.

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• Over gigabit connection, Teracopy does 31MB/s, but Windows 8 does it at ~109MB per second?

  - by Gaurang

  I got my brain-melting first taste of Gigabit networking today, between my 2011 MacMini and Windows 8 Pro desktop connected via Cat.5e to Linksys WRT320N(sporting dd-WRT). After making sure that the line speed on both systems showed 1Gbps, I proceeded to copying a 2.4GB MP4 from the Mini to the Win 8 desktop (SMB sharing). Although satisfied with the 30-34 MB/s that Teracopy was showing (that was a proper step-up for me from 10 MB/s), I still was curious about this massive difference in the advertised and real-world speed. 2 hours of Google had me believing that there were other factors that resulted in less speed, SMB being one. So just for the sake of doing it, I iPerf'd both the systems and guess what that showed - around 875mbps on both systems! I then stumbled upon this little piece of info after which I turned off Teracopy and copied the same file through Windows 8's regular copier. 109 MB/s. Molten brains :) What exactly is causing this? And can I enable such speeds via Teracopy? I really dig the extra features that Teracopy has, will surely miss them now :D

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• Distributing processing for an application that wasn't designed with that in mind

  - by Tim

  We've got the application at work that just sits and does a whole bunch of iterative processing on some data files to perform some simulations. This is done by an "old" Win32 application that isn't multi-processor aware, so new(ish) computers and workstations are mostly sitting idle running this application. However, since it's installed by a typical Windows Install Shield installer, I can't seem to install and run multiple copies of the application. The work can be split up manually before processing, enabling the work to be distributed across multiple machines, but we still can't take advantage of multiple core CPUs. The results can be joined back together after processing to make a complete simulation. Is there a product out there that would let me "compartmentalize" an installation (or 4) so I can take advantage of a multi-core CPU? I had thought of using MS Softgrid, but I believe that still depends on a remote server to do the heavy lifting (though please correct me if I'm wrong). Furthermore, is there a way I can distribute the workload off the one machine? So an input could be split into 50 chunks, handed out to 50 machines, and worked on? All without really changing the initial application? In a perfect world, I'd get the application to take advantage of a DesktopGrid (BOINC), but like most "mission critical corporate applications", the need is there, but the money is not. Thank you in advance (and sorry if this isn't appropriate for serverfault).

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