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• Vlan and Switch setting - dummy

  - by Andras Sebestyen

  I need to speak tomorrow the network engineer and I would like to understand his so apologise for the Dummy question: In the school we have a cab with a 24 port Netgear manageable switch with an admin and curriculum VLAN settings. Usually, as I over heard, in the morning and around 4.30pm there are a slowdown period on the computers which connect to this switch. No one could track this back yet. Questions: What is the best way to track back this slowdown Would it be a temporary solution to physical separate the two network with 2 switches If that would work how can I link them together to be able to see the curriculum from the admin side. Do I need an extra router then? Too many questions but I have no clue where to start and the gentleman will be paid by hours... can you see where I am coming from?:) Could you guide me in the right direction please? Any comment would be appreciated and please send links if you down vote the question:)

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• failing to achive tunneling to fresh ubuntu 10.04 server

  - by user65297

  I've just set up a new 10.04 server and can't get the tunneling to work. local machine > ssh -L 9090:localhost:9090 [email protected] login success, but thereafter trying tunnel from local browser, http://127.0.0.1:9090 echo at server terminal: channel 3: open failed: connect failed: Connection refused auth.log sshd[24502]: error: connect_to localhost port 9090: failed. iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination Trying 9090 at server (links http://xx.xxx.xx.xx:9090 works) sshd_config is identical to previous 8.04 server, working fine. What's going on? Thankful for any input. Regards, //t

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• Direct DB to Web Server connection

  - by Joel Coel

  I have a database server sitting right underneath a virtual machine host server in the rack, and this vm host is primarily responsible for servers hosting a couple different web sites and app servers that all talk to databases on the other server. Right now both servers are connected to the same switch, and I'm pretty happy with the pathing. However, both servers also have an unused network port. I wondering about the potential benefits of using a short crossover or normal+auto mdix network cable to connect these two servers together directly. Is this a good idea, or would I be doing something that won't show much benefit and is just likely to trip up a future admin who's not looking for this? The biggest weakness I can see right now is that this would likely require a code change for each vm app to point to the new IP of the database server on this private little network, and if I have a problem with the virtual machine host and have to spin up it's guests elsewhere while I fix it I'll have to change this back before things will work.

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• How does Router know where to forward packet

  - by kornelijepetak

  If several computers with local addresses (192.168.0.#) are connected to a router and each computer opens a web browser and requests a page over HTTP, when these TCP:80 packets are sent out, the router switches the local address with the static IP of the router (i.e. Provider given IP) so the server can reply to the appropriate address. But how does the router know to which computer to forward the HTTP reply, since the TCP header does not contain the local IP address (does it?), and all computers are using port 80? Does this have anything to do with the MAC addresses? How exactly does this work?

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• Enable Server Status using Plesk 11

  - by Lars Ebert

  I am trying to get apaches server status to work with Plesk 11. But running sudo /usr/sbin/apache2ctl fullstatus results in: Forbidden You don't have permission to access /server-status on this server. __________________________________________________________________ Apache Server at localhost Port 80 'www-browser -dump http://localhost:80/server-status' failed. Maybe you need to install a package providing www-browser or you need to adjust the APACHE_LYNX variable in /etc/apache2/envvars How can I enable server status? So far I have tried to insert <Location /server-status> SetHandler server-status Order Deny,Allow Deny from all Allow from localhost </Location> into the httpd.conf, but I am not sure if it is active. I also tried adding it to /var/www/vhosts/somedomain/conf/vhost.conf but I do not know which domain I have to add this to, as fullstatus seems to query localhost directly. I guess I am a little confused by the use of vhost configuration in Plesk.

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• Ubuntu Startup xsp4

  - by Chin Ye

  when i type in terminal command are working fine root@syscomp:/var/www/WebSite2# xsp4 xsp4 Listening on address: 0.0.0.0 Root directory: /var/www/WebSite2 Listening on port: 9000 (non-secure) Hit Return to stop the server. but i m using script in /etc/init/GPS_WebSite.conf when the script are running fine, but not running in background when the script run one time and then closed, that is why my mono server are not running all the time, this is my GPS_WebSite.conf script, what i need to change to be running forever in background? start on login-session-start script exec > /tmp/debug-my-script.txt 2>&1 sleep 10 cd /var/www/WebSite2 xsp4 end script

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• Internet connection very slow after Linksys configuration

  - by NLV

  Hello We have this network setup Server1 - DHCP server, Domain Controller, AD Lease line for Internet connection From lease line to Linksys router (we dont use wireless though) From linksys to Netgear (24 port Switch) and vonage (VoIP) Netgear to all our machines We configured Linsys with the static IP and DNS server addresses our ISP gave and we have routed it correctly. All our work machines are configured with Get IP automatically DNS server addresses our ISP gave The problem is that none of the sites are getting opened promptly. It is taking around 5 minutes to load google.com. But we are able to ping all the sites. What could be the problem?

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• Crossover cable in addition to normal network connection on servers?

  - by Zero0ne

  I have 2 servers, both with Windows 2003 R2 Each have 2 NIC ports that are 10/100/1000 They are both connected to our LAN + joined to the domain (1 NIC port free on each server) The problem is that our main router is only 10/100 on the ports that these servers are connected to. Since one server is going to host SQL 2005 and the other will be running Altiris NS7, I was hoping that I could use a crossover cable to connect the two directly, thus taking advantage of their 1gbps NIC cards. Is this possible? If so what steps do I need to take to accomplish this? What needs to be done to make sure that when the app server is communicating with the SQL server that it is using the direct link vs traversing the LAN? Thanks a lot!

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• List of tablets with keyboards.

  - by JamesM

  Please if you know any good tablets with keyboards that come either built-in or attachable (not via a USB port) please post a link to the tablet, Please add a review for that tablet if you have one, if you don't have one please say what you would do with it if you had one. It must have a physical keyboard, Cannot be a wired or wireless keyboard, only built-in/attachable see below tablets for more of an idea. Tablets With Keyboards: http://gdgt.com/asus/eee/pad/slider/ http://gdgt.com/asus/eee/pad/transformer/ If you have a table, Please what do you think of it: (Review) Your-Name: Your review. If you don't have a tablet (with a non USB keyboard) please say what you would do with one: JamesM: If I have a slider or a transformer, it would be running kFreeBSD-Debian-Squeeze. Please feel free to improve the layout/format of this topic.

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• SATA 3 PCIe Controller working with decreased performance (slower than SATA 2)

  - by V M

  After reading this question about maxing out an SSD I decided to do so myself. My mobo only supports SATA 2 and has two PCIe 2.0 x1 connectors (which promiss up to 500 mb/s). So after some searching I decided to go with this controller from amazon. My Samsung magician benchmark before upgrade (running SATA 2): Now after installing the controller all of the benchmark scores are lower (even though the Samsung Magician app confirms its connected to a SATA 3 port): What can I do to remedy this? Any help is appreciated.

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• IIS exclude specific host?

  - by chakrit

  I have an IIS server running several websites. It is stationed behind an ISA server of which I do not have access. But I do have all of the defined websites (on port 80) routed to my server. So I want to take down one website, say it's foo.bar.com and in its place setup a LAMP server instead using a VM software. It needs to run alongside all the existing websites and it should not interfere with them. I have full control over my server, but not the ISA. Is this possible? If so, how? The OS is Win Server 2003 Standard with IIS6

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• How to give virtual machine access to the Internet, but block from LAN?

  - by Pekka

  I am setting up a virtual machine using Microsoft Virtual PC in Windows 7. The VM will run a Windows XP. I want to set up a public-facing server in it for web pages, subversion and other things, and instruct the router to port forward any requests to that Virtual Machine. I managed to do that - I assigned the VM to the network adapter, and it is now acting as just another DHCP client - but to increase security I would like to block the VM from the rest of the LAN, so it accepts only incoming connections from the Internet. For this to be effective in case of a compromise, it would have to happen on VM level as far as I can see. Can this be done?

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• Can't connect using Jail SFTP account

  - by Fazal

  I've been following this tutorial "Limiting Access with SFTP Jails on Debian and Ubuntu" and whilst I've had no errors setting it up, I've had issues on Ubuntu 10.04LTS logging in as a user on a virtualhost. I've changed my SSH port to 22022, and enter all the credentials when attempting to login. I ran these commands to add a user to the virtualhost: # useradd -d /srv/www/[domain] [username] # passwd [username] # usermod -G filetransfer [username] # chown [username]:[username] /srv/www/[domain]/public_html I should add that this is the only time I've setup the user they have no other /home directories or such. The directory that does exist is at /srv/www/example.com/public_html When I try using a desktop package such as cyberduck to login to the site, I keep getting a "Login failed with this username or password". I am completely lost as what to do next... The reason why I'm trying this method is because I want my clients to use SFTP and not FTP to upload files to their websites. Any help or direction is appreciated.

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• OS X 10.7.5 - telnet: connect to address 10.0.0.12: Operation not permitted

  - by user2169619

  I have troubles to connect from macos to reach windows shares and I hit some general problem with my macos. When I try to telnet to 445 port to my windows share server the macos throws "Operation not permitted". I have no firewall rule and I'm not able to google anything. sh-3.2# telnet 10.0.0.12 445 Trying 10.0.0.12... telnet: connect to address 10.0.0.12: Operation not permitted telnet: Unable to connect to remote host Any idea what can be the reason?

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• High availability for Windows Service under Windows Server 2003

  - by empi

  Hi. I have a following situation: I need to deploy a windows service that listens for incoming request on tcp port (basically WCF service). I have a High Availability requirement - the service must be deployed on two servers and if the service stops (only the service, not the whole server) on one server, all the requests must be redirected to the second one. For me it looks like a basic failover scenario. How can I achieve this on Windows Server 2003? Should I use Microsoft Cluster Service or Network Load Balancing? The important part is that the process of swapping the servers should not concern the clients (the client must see only single address / single host or domain name). Thanks in advance for help.

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• datacenter network change control best practices

  - by jpolache

  I have been tasked with compiling a list of possible network equipment changes at a data center. The task includes tagging which changes need change control and which don't. Does anyone know of a "best practices" list that I can start from? The methods for doing change control at this data center are well established. The list would be of specific configuration items that should or should not be included in the change control process, of example; static route entries switch port assignments firewall rule additions/changes etc.

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• Routing to various node.js servers on same machine

  - by Dtang

  I'd like to set up multiple node.js servers on the same machine (but listening on different ports) for different projects (so I can pull any down to edit code without affecting the others). However I want to be able to access these web apps from a browser without typing in the port number, and instead map different urls to different ports: e.g. 45.23.12.01/app - 45.23.12.01:8001. I've considered using node-http-proxy for this, but it doesn't yet support SSL. My hunch is that nginx might be the most suitable. I've never set up nginx before - what configuration do I need to do? The examples of config files I've seen only deal with subdomains, which I don't have. Alternatively, is there a better (stable, hassle-free) way of hosting multiple apps under the same IP address?

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• How to create a virtual input in windows from an audio stream

  - by Brian

  Great to find this forum full of knowledge. I was wondering if anyone knew of an application or other work around to create a virtual input device in windows. I have a IP cam app on my android phone, that I would like to use for skype webcam. It comes with a port for getting the video feed into skype, and that works great. However, the only audio available, is a OGG stream. Both video and audio work great with media players such as VLC etc, but ot with skype, since skype only works with windows input devices. Is there such software outthere, in which I could simply name my audio stream address, and pipe that to a virtual input device to allow skype to find it?

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• Get OWA and ActiveSync working on server using HTTP redirect in IIS 7

  - by eric

  We have two servers on our LAN. One is a Windows 2003 Server domain controller running Exchange 2003. The other is a stand-alone Windows 2008 server running IIS 7. Our company website runs on the IIS 7 (2008) server, so the firewall forwards port 80 to this. How can I get OWA and ActiveSync to work with this setup? And without using SSL. I have tried setting up a website on the IIS 7 box (mail.ourdomain.com) and using HTTP redirect to point to http://mailserver/exchange, but this doesn't work. Do we have to purchase an SSL certificate for this to work?

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• help setting up an IPSEC vpn from my linux box

  - by robthewolf

  I have an office with a router and a remote server (Linux - Ubuntu 10.10). Both locations need to connect to a data supplier through a VPN. The VPN is an IPSEC gateway. I was able to configure my Linksys rv42 router to create a VPN connection successfully and now I need to do the same for Linux server. I have been messing around with this for too long. First I tried OpenVPN, but that is SSL and not IPSEC. Then I tried Shrew. I think I have the settings correct but I haven't been able to create the connection. It maybe that I have to use something else like a direct IPSEC config or something like that. If someone knows of a way to turn the following settings that I have been given below into a working IPSEC VPN connection I would be very grateful. Here are the settings I was given that must be used to connect to my supplier: Local destination network: 192.168.4.0/24 Local destination hosts: 192.168.4.100 Remote destination network: 192.167.40.0/24 Remote destination hosts: 192.168.40.27 VPN peering point: xxx.xxx.xxx.xxx Then they have given me the following details: IPSEC/ISAKMP Phase 1 Parameters: Authentication method: pre shared secret Diffie Hellman group: group 2 Encryption Algorithm: 3DES Lifetime in seconds:28800 Phase 2 parameters: IPSEC security: ESP Encryption algortims: 3DES Authentication algorithms: MD5 lifetime in seconds: 28800 pfs: disabled Here are the settings from my attempt to use shrew: n:version:2 n:network-ike-port:500 n:network-mtu-size:1380 n:client-addr-auto:0 n:network-frag-size:540 n:network-dpd-enable:1 n:network-notify-enable:1 n:client-banner-enable:1 n:client-dns-used:1 b:auth-mutual-psk:YjJzN2QzdDhyN2EyZDNpNG42ZzQ= n:phase1-dhgroup:2 n:phase1-keylen:0 n:phase1-life-secs:28800 n:phase1-life-kbytes:0 n:vendor-chkpt-enable:0 n:phase2-keylen:0 n:phase2-pfsgroup:-1 n:phase2-life-secs:28800 n:phase2-life-kbytes:0 n:policy-nailed:0 n:policy-list-auto:1 n:client-dns-auto:1 n:network-natt-port:4500 n:network-natt-rate:15 s:client-dns-addr:0.0.0.0 s:client-dns-suffix: s:network-host:xxx.xxx.xxx.xxx s:client-auto-mode:pull s:client-iface:virtual s:client-ip-addr:192.168.4.0 s:client-ip-mask:255.255.255.0 s:network-natt-mode:enable s:network-frag-mode:disable s:auth-method:mutual-psk s:ident-client-type:address s:ident-client-data:192.168.4.0 s:ident-server-type:address s:ident-server-data:192.168.40.0 s:phase1-exchange:aggressive s:phase1-cipher:3des s:phase1-hash:md5 s:phase2-transform:3des s:phase2-hmac:md5 s:ipcomp-transform:disabled Finally here is the debug output from the shrew log: 10/12/22 17:22:18 ii : ipc client process thread begin ... 10/12/22 17:22:18 < A : peer config add message 10/12/22 17:22:18 DB : peer added ( obj count = 1 ) 10/12/22 17:22:18 ii : local address 217.xxx.xxx.xxx selected for peer 10/12/22 17:22:18 DB : tunnel added ( obj count = 1 ) 10/12/22 17:22:18 < A : proposal config message 10/12/22 17:22:18 < A : proposal config message 10/12/22 17:22:18 < A : client config message 10/12/22 17:22:18 < A : local id '192.168.4.0' message 10/12/22 17:22:18 < A : remote id '192.168.40.0' message 10/12/22 17:22:18 < A : preshared key message 10/12/22 17:22:18 < A : peer tunnel enable message 10/12/22 17:22:18 DB : new phase1 ( ISAKMP initiator ) 10/12/22 17:22:18 DB : exchange type is aggressive 10/12/22 17:22:18 DB : 217.xxx.xxx.xxx:500 <- 206.xxx.xxx.xxx:500 10/12/22 17:22:18 DB : c1a8b31ac860995d:0000000000000000 10/12/22 17:22:18 DB : phase1 added ( obj count = 1 ) 10/12/22 17:22:18 : security association payload 10/12/22 17:22:18 : - proposal #1 payload 10/12/22 17:22:18 : -- transform #1 payload 10/12/22 17:22:18 : key exchange payload 10/12/22 17:22:18 : nonce payload 10/12/22 17:22:18 : identification payload 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local supports nat-t ( draft v00 ) 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local supports nat-t ( draft v01 ) 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local supports nat-t ( draft v02 ) 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local supports nat-t ( draft v03 ) 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local supports nat-t ( rfc ) 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local supports DPDv1 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local is SHREW SOFT compatible 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local is NETSCREEN compatible 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local is SIDEWINDER compatible 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local is CISCO UNITY compatible 10/12/22 17:22:18 = : cookies c1a8b31ac860995d:0000000000000000 10/12/22 17:22:18 = : message 00000000 10/12/22 17:22:18 - : send IKE packet 217.xxx.xxx.xxx:500 - 206.xxx.xxx.xxx:500 ( 484 bytes ) 10/12/22 17:22:18 DB : phase1 resend event scheduled ( ref count = 2 ) 10/12/22 17:22:18 ii : opened tap device tap0 10/12/22 17:22:28 - : resend 1 phase1 packet(s) 217.xxx.xxx.xxx:500 - 206.xxx.xxx.xxx:500 10/12/22 17:22:38 - : resend 1 phase1 packet(s) 217.xxx.xxx.xxx:500 - 206.xxx.xxx.xxx:500 10/12/22 17:22:48 - : resend 1 phase1 packet(s) 217.xxx.xxx.xxx:500 - 206.xxx.xxx.xxx:500 10/12/22 17:22:58 ii : resend limit exceeded for phase1 exchange 10/12/22 17:22:58 ii : phase1 removal before expire time 10/12/22 17:22:58 DB : phase1 deleted ( obj count = 0 ) 10/12/22 17:22:58 ii : closed tap device tap0 10/12/22 17:22:58 DB : tunnel stats event canceled ( ref count = 1 ) 10/12/22 17:22:58 DB : removing tunnel config references 10/12/22 17:22:58 DB : removing tunnel phase2 references 10/12/22 17:22:58 DB : removing tunnel phase1 references 10/12/22 17:22:58 DB : tunnel deleted ( obj count = 0 ) 10/12/22 17:22:58 DB : removing all peer tunnel refrences 10/12/22 17:22:58 DB : peer deleted ( obj count = 0 ) 10/12/22 17:22:58 ii : ipc client process thread exit ...

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• 1Gigabit vs 1.25Gibabit mismatch

  - by Joel Coel

  I need to re-connect the network to a small old outbuilding that hasn't been used in several years. I have to use the existing 62.5um multi-mode fiber run. This end of the fiber is already connected. For the end in the building, I was looking at this pair: http://www.tp-link.com/products/productDetails.asp?class=switch&content=spe&pmodel=TL-SM311LM http://www.tp-link.com/products/productDetails.asp?class=&content=spe&pmodel=TL-SL2210WEB If you look at the sfp first (first link), it's listed at 1.25Gpbs. That's odd, because IIRC the fiber should really only do 1Gbps. It's also supposed to work with the switch I posted (2nd link), but the gbic port on the switch also only shows 1Gbps. What am I missing here?

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• setting up delegate or smtp forwarding

  - by cotiso

  for work we have a remote dedicated server to run our webservice that also runs our email services, at home(comcast residential internet) i cannot send mail using the dedicated server's SMTP, comcast spits back a error saying i can only use their SMTP server for sending mail at work(comcast business internet) we can use our dedicated server for sending mail with no problem so i set up a box at work to forward smtp traffic, i'm new to all this networking stuff by the way i used delegate to forward smtp traffic, can someone point me in the right direction on how to use this program(delegate) to fix our issue the delegate command i used to test is : delegated -P25 SERVER="smtp://dedicated.server.com:25" PERMIT=":::" -v i also opened up port 25 on the router so it points to my boxes ip are there any other ways to fool comcast into thinking im using my works ip to send mail, my coworkers and i are unable to send mail from home for some time now thanks

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• Belking Wireless Router unable to connect to internet although wireless connection is working

  - by ptamzz

  I have a Belkin Basic N150 Wireless router. I'm trying to set up wireless connection using the wired ports my university has provided in my hostel room. Usually, when I connect my laptop using a LAN wire through the port, my settings are like IP: 10.5.130.X Subnet Mask: 255.255.254.0 Default Gateway: 10.5.130.250 DNS Server: 10.200.1.11 and I'm able to connect to the internet. Now instead of connecting my laptop directly, I've connected the lan wire to the Belkin Wireless Router, set the router as "Use as an Access Point" and in the IP field, I've put up 10.5.130.1. Now I've set the IP of my system manually to 10.5.130.3. I'm able to connect to the wi-fi but I'm still not able to connect to the internet. What am I missing?

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• Canot send SMS using gammu-smsd

  - by khalid hussain

  I am trying to send SMS using gammu-smsd, but it does not work. Modem: Huawei E1550 Steps: #vi /etc/gammu-smsdrc port= /dev/ttyUSB0 connection = at Then restarted gammu-smsd: # /etc/init.d/gammu-smsd restart SMS Sending test echo "Test message" | gammu-smsd-inject TEXT 335123456 It does not send SMS. Log Sep 27 14:19:25 Dell-Laptop gammu-smsd[10285]: Going to 30 seconds sleep because of too much connection errors Sep 27 14:19:55 Dell-Laptop gammu-smsd[10285]: Starting phone communication... Sep 27 14:19:55 Dell-Laptop gammu-smsd[10285]: Error at init connection: Error opening device, it doesn't exist. (DEVICENOTEXIST[4])

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• Apache: Setting up a reverse proxy configuration with SSL with url rewriting

  - by user1172468

  There is a host: secure.foo.com that exposes a webservice using https I want to create a reverse proxy using Apache that maps a local http port on a server internal.bar.com to the https service exposed by secure.foo.com Since it a web service I need to map all urls so that a path: https://secure.foo.com/some/path/123 is accessible by going to: http://internal.bar.com/some/path/123 Thanks. I've gotten this far: <VirtualHost *:80> ServerName gnip.measr.com SSLProxyEngine On ProxyPass / https://internal.bar.com/ </VirtualHost> I think this is working except for the url rewriting. Some resources I've found on this are: Setting up a complex Apache reverse proxy Apache as reverse proxy for https server

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