Ubuntu Networking :: Infiniband Configuration On 11.04 Server?

Aug 11, 2011

I work at an IT firm and was tasked with setting up an Infiniband network. As of now this consists of 2 Servers, each with a Mellanox Technologies MT25204 card, connected by a cableI installed the userspace drivers and the ofed drivers, added the following to my /etc/modules:

rdma_ucm
ib_sa
ib_cm

[code]....

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Networking :: Concepts Of IPoIB And TCP Over Infiniband?

May 19, 2011

Can someone explain the concepts of IPoIB and TCP over infiniband? I understand the overall concept and data rates provided by native infiniband, but dont quite understand how TCP and IPoIB fit in. Why do u need them and what do they do? What is the difference when someone says their network uses native IB, IPoIB or TCP with infiniband? Which one is better? I am not from a strong networking background, so it would be nice if you could elaborate.

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Fedora Networking :: Infiniband Cards - Slow Initial Ping

Aug 10, 2011

So after some period of inactivity, my FC servers with infiniband cards in them seem to go to sleep or something. If I login to the machine and try to ping other machines with IB interfaces, the first request takes much longer than the others. This is not so over Ethernet.

compute-4-12 ~]# ping ib-s0-1 (this is a solaris machine)
PING ib-s0-1.local (192.168.1.19) 56(84) bytes of data.
64 bytes from ib-s0-1.168.192.in-addr.arpa (192.168.1.19): icmp_req=1 ttl=255 time=3.64 ms
64 bytes from ib-s0-1.168.192.in-addr.arpa (192.168.1.19): icmp_req=2 ttl=255 time=0.131 ms
64 bytes from ib-s0-1.168.192.in-addr.arpa (192.168.1.19): icmp_req=3 ttl=255 time=0.222 ms

compute-4-08 ~]# ping c4-7 (identical neighboring FC machine)
PING compute-4-07.local.local (10.255.255.187) 56(84) bytes of data.
64 bytes from compute-4-07.local.255.10.in-addr.arpa (10.255.255.187): icmp_req=1 ttl=64 time=1.28 ms
64 bytes from compute-4-07.local.255.10.in-addr.arpa (10.255.255.187): icmp_req=2 ttl=64 time=0.108 ms
64 bytes from compute-4-07.local.255.10.in-addr.arpa (10.255.255.187): icmp_req=3 ttl=64 time=0.115 ms
64 bytes from compute-4-07.local.255.10.in-addr.arpa (10.255.255.187): icmp_req=4 ttl=64 time=0.119 ms
64 bytes from compute-4-07.local.255.10.in-addr.arpa (10.255.255.187): icmp_req=5 ttl=64 time=0.180 ms

This issue does not only affect ping. I created a user that mounts his home directory over nfs over infiniband. ssh'ing in takes longer the first time as well. If I ssh with verbosity turned up all the way, I get a brief hang at "we sent a hostbased packet, wait for reply" (this is the primary symptom I'm trying to get rid of since we want home directories over nfs over IB (without the initial delay)).

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Ubuntu Networking :: Specify The WINS Server In The Lan Configuration?

Jan 12, 2010

I'm trying to configure my ubuntu 9.10 to access a lan. In the gnome network manager I can find all the blanks to fill with the ip, subnet mask, gateway and dns, but I can't understand how I can specify the wins server ip.

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Networking :: Regarding Squid Server Configuration

Jun 11, 2011

I have 10 systems on my network and I have centos5.5 installed on server. All other clients are on WinXP. I am using squid server to share internet on my network.Problem is: whenever an user trying to open a website through squid server, it opens too slow, but if same user tries to open same website by passing squid server, it opens 3 times faster. Downloading speed is same in both scenario. Only buffering speed is slow through squid.

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Fedora Networking :: OpenVPN Server Configuration On F14

Jun 16, 2011

I have (seemingly regretfully) finally upgraded my Fedora Core 7 linux machine that has served me so well for the past decade. One of the final pieces to put in place was my Openvpn config (which was running flawlessly on my FC7) which I cannot get to work.

Here are my steps.

1. Disabled SELinux

2. Added the following entry in my iptables: (although I've stopped iptables to help troubleshoot)
-A INPUT -i tap0 -j ACCEPT
-A INPUT -i br0 -j ACCEPT
-A FORWARD -i br0 -j ACCEPT

3. Yum installed openvpn and bridge-utils (btw I'm using bridging)

4. Configured my bridge-start script as such:
#!/bin/bash
# Set up Ethernet bridge on Linux
# Requires: bridge-utils
# Define Bridge Interface
br="br0" .....

5. Configured my openvpn server conf as such:
proto tcp-server
port 5990
dev tap0 .....

When I execute my bridge-start script it creates the br0 and tap0 then all connectivity vanishes (I can only ping my gateway 10.0.0.50) - internet and any other addresses time out.

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Networking :: Samba Server Configuration - Error

Jul 19, 2010

I am trying to configure samba server on my linux RHEL 5 box to windows 2000 NT boxes but getting the following error

Global parameter guest account found in service section!
[2010/07/16 16:01:13, 0] lib/util_sock.c826)
bind failed on port 139 socket_addr = 0.0.0.0.
Error = Address already in use

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Ubuntu Networking :: Wired Network Configuration - Server Can't Be Found At The Given Address In Firefox

Sep 11, 2010

My father has configured his network and the computer has connected to the wired network. The problem is firefox says the server cant be found at the given address. The wired router says its connected to the network and yet firefox doesn't see the router admin page or network.

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CentOS 5 Networking :: RDNS For E-mail Server Configuration - NAT Involved?

Aug 24, 2009

I'm having an issue with an e-mail server (with an IP of 10.10.0.1) which is behind NAT (Cisco ASA) which in turn of course has it's own external IP (let's say - IP 10.10.0.100). Both IPs are public.Now, if i wanted to set up a correct RDNS configuration for my domain, what should be the IP address entry for the PTR record in this case?

I know this is strictly network configuration related question (not Linux, or CentOS for that matter), but I wouldn't be asking if I didn't get a few bouncing e-mails every once in a while (i.e. NDRs) with messages like: You do not have permission to send to this recipient. For assistance, contact your system administrator.

[Code]...

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CentOS 5 Networking :: Configuration In Huawei Switch And Radius Server For User Authentication

Sep 25, 2009

i want to authenticate user (client) via switch to the radius server(CentOS)Can anyone tell me the authentication/authorization configuration that should be made in the switch (huawei) and the radius server(centos).Esp. the main files under /etc/raddb/ in the Server& the configuration to be made under the radius server template "test"( as of my case)...

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CentOS 5 Hardware :: Infiniband (mlx4) Works On 16-core System But (now) Fails On 32-core System

Jan 27, 2010

We have a small cluster of 20 HP systems, all running CentOS 5.3 in an NFS-root environment. Half are quad-socket, quad-core Xeon E7340 @ 2.40GHz (total 16 cores), the other half are 8-socket, quad-core Opteron 8354 (total 32 cores). All systems have a Mellanox Infiniband adapter ("Mellanox Technologies MT25418 [ConnectX VPI PCIe 2.0 2.5GT/s - IB DDR / 10GigE] (rev a0)")

With kernel 2.6.18-128.1.6.el5, infiniband works fine on all systems.

With the update to kernel 2.6.18-164.11.1.el5 (and both types of node running the same NFS-root image), the 16-core Xeons still work fine. Infiniband no longer works on the 32-core Opterons. Specifically, either the ib0 interface fails to appear, or it does appear but when configured with an IP address, doesn't actually work. In either case, loading the IB kernel modules takes a long time, but I haven't instrumented the load script yet to see which module, if any, is at fault. More errors listed below.

However, if I tweak the BIOS of the 32-core systems to reduce the per-socket core count to 2 (so effectively 8-socket, dual-core, down to a total of 16 available cores), Infiniband starts working again. Putting it back to 32-cores makes it fail. Booting the older kernel makes it work again. In summary: old kernel, IB works on all systems. Newer kernel, IB only works on 16-core systems.

Updating the IB firmware from 2.5.0 to 2.7.0 (latest available) doesn't help. I also did a full 'yum update' to make sure that libmlx4, openibd all other associated packages were up-to-date. Doesn't help either.

Some errors that appear on 32-core nodes:

ib_query_port failed (-16) for mlx4_0
ib_query_port failed (-16) for mlx4_0
mlx4_core 0000:04:00.0: SW2HW_MPT failed (-16)
mlx4_core 0000:04:00.0: SW2HW_MPT failed (-16)

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Networking :: Network Configuration: Server - Router Vs Router-server

Aug 14, 2010

I am thinking of moving the router behind a server and connecting the server directly to the internet via a modem. Are there any security issues related to doing this? or other things I should be aware of. Iptables are implemented on the server blocking access on unused ports.

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Server :: Server Configuration For Small Office Server, Which Smtp, Pop Imap Server And Backup?

Apr 2, 2010

I have installed a linux server in my office to run 16 machines. Its main use will be a internal mail server but will be also running websites.

I have installed Ubuntu 9.10 server x64 and have got apache running.

I am looking for the simplest more robust solution for smtp, pop3 and imap. I have only ever used qmail before and found it a pain to configure and its getting old so I though I should probably try something new. I have not much experience with running pop3 or imap on linux so would love a suggestion on that.

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Debian Configuration :: Reboot Both The Server And The Client Machines Every Time Change The SAMBA Configuration?

Apr 5, 2010

I am *finally* getting around to rebuilding my file-sharing computer. I'll be sharing files with both Linux and Windoze machines. It's a home network, so there's nothing fancy needed. I know I have to tweak my smb.conf file until I'm satisfied with the features and security. I'm using SWAT and I'm starting with a bare-bones conf file. It's not secure but I can see the server and selected files/directories from my other Linux box.

My really dumb question is, do I have to reboot both the server and the client machines every time I change the SAMBA configuration? I thought I just had to stop and restart the SAMBA service in the SWAT software - but then the server disappears from my client. It looks like I need to reboot both machines for the client to see the server.

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Server :: Minimum Partition Size Required In Redhat Linux Server For DNS Server Configuration?

May 5, 2011

Right now i have a HP DL 180 Server with 130 Gb Hard Disk & 8 Gb ram after Raiding0+1. i want to configure Domain Controller Server for my office for 200 to 300 Users. what should the partition size must be mentioned in my 130 Gb Hard Disk, is that going to be Sufficient for ME ?

i am bit confused about /Usr /Var /Boot partitions, as i need to manage perfectly in 130 GB

if i go with 4 Gb swap and remaining for " / " is that will be fine ? should i need to specify partition sizes separately for / tmp /var / usr ..

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Debian Configuration :: Install A Multi-core System And Configure It To Run Several VMs, One Each For A Firewall, A Caching Proxy Server, A Mail Server, A Web Server?

Jan 25, 2011

I will be relocating to a permanent residence sometime in the next year or two. I've recently begun thinking about the best way to implement a home-based network. It occurred to me that the most elegant solution might be the use of VM technology to eliminate as much hardware and wiring as possible.My thinking is this: Install a multi-core system and configure it to run several VMs, one each for a firewall, a caching proxy server, a mail server, a web server. Additionally, I would like to run 2-4 VMs as remote (RDP)workstations, using diskless workstations to boot the VMs over powerline ethernet.The latest powerline technology (available later this year) will allow multiple devices on a residential circuit operating at near gigabit speed, just like legacy wired networks.

In theory, the above would allow me to consolidate everything but the disklessworkstations on a single server and eliminate all wired (and wireless) connections except the broadband connection to the Internet and the cabling to the nearest power outlets. It appears technically possible, but I'm not sure about the various virtual connections among VMs. In theory, each VM should be able to communicate with the other as if it was on the same network via the server data bus, but what about setting up firewall zones? Any internal I/O bandwidth bottlenecks? Any other potential "gotchas", caveats, issues? (Other than the obvious requirement of having enough CPU and RAM).Any thoughts or observations welcome, especially if they are from real world experience in a VM environment. BTW--in case you're wondering why I'm posting here, it's because I run Debian on all my workstations/servers (running VirtualBox as a VM for Windows XP on one workstation).

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Networking :: LDAP Configuration Error - Can't Connect To LDAP Server -1

May 31, 2010

I'm trying to set up a Linux server and I am new to this. I have gone through most of the configuration using SAMBA 3.0 and when I populate the ldap directory all I get this error before the password request:

Then when I perform an ldapsearch to see if the directory is populated I get this message:

I'm positive all my .conf files are done right.

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Programming :: Java Servlets: Setup The Server Side Configuration On Fedora Web Server?

Jan 4, 2010

If you hadn't guessed it from my last 3000(ish) java-related posts, I'm a Java n00b writing a Java Applet for a work project. I got to the part was I was about to write the applet code that would send HTTP requests to my CGI scripts. But I read some paragraphs in a book praising Java servlets as better that CGI because they are easier to use and give much better performance server side. My server load isn't very big, though, and I was wondering if it would be worth taking the time to learn about Java servlets and how to set up the server side configuration on my Fedora web server.

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Debian Configuration :: Keeping The Dns Server Running With Current Server Information?

Jun 26, 2010

I'm running the current release of Debian with the 2.6.26-2 kernel. This is an upgrade from an older (2.4 kernel) series redhat release. One of the things I had working in the older system was a dns server with accompanying monthly update of the root hints file. I tried working through a dns how-to to set this up again, but it seems much has moved around since I last played with this. All of the files listed in the how-to are not where it says they should be. I am looking for a better reference on keeping the dns server running with current server information.

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Debian Configuration :: Installed Nfs-kernel-server On The Server And Nfs-common On The Client?

May 3, 2011

I have installed nfs-kernel-server on the server and nfs-common on the client. Assumeserver 192.168.1.1client 192.168.1.3

content of /etc/exports is:
/home  192.168.1.0/255.255.255.0(rw,sync,no_root_squash)
/home/nfsroot  192.168.1.0/255.255.255.0(rw,no_subtree_check,async,no_root_squash)

[code]....

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Server :: Apache Server In No Starting / Not Strating On Default Configuration File?

Mar 21, 2011

I have install Mandriva 2009 and install apache server but its not strating on default configuration file . What I should do for starting apache . i have tried /etc/init.d/httpd start but apache is not running .

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Server :: Email Sent My Server Always Received To Spam Folder / Wrong Configuration?

Aug 16, 2010

After installing postfix on my server , all emails sent by a PHP class that i built , are received to spam folder , no matter what i do .am not an expert , except in PHP , the class i built works fine everywhere else except on this server , so i think the problem might be from the server it self ?some told me wrong configuration/software on my server , others told me wrong DNS stuff . actually i don't understand the DNS stuff , and am not an expert in linux softwares and services but i cann install/configure them , so could anyone please check the DNS for problems ?

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Server :: Slackware 13.0 DHCP Server - Configuration File Errors Encountered?

Nov 17, 2010

I'm trying to set up a PXE boot server on a PC running Slackware 13.0 using the default apps and info shipped with that Slackware version but to no avail...Carefully reading the Slackware 13.0 README_PXE I've put together this dhcpd.conf file:

# dhcpd.conf
#
# Configuration file for ISC dhcpd (see 'man dhcpd.conf')

[code]....

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Server :: LDAP SERVER: Post A Tar.gz With The Working Configuration Files?

Jan 14, 2010

LDAP is endlessly not working, due to difficulties to simply configure it. I even cannot make the first steps of the installations ... It seems so difficult ... After many howto, wiki, reading, re-reading the errors are still there, always different, and not working.Is there an admin, coming from hell, that made running a LDAP server for sharing the basic configuratin files /var.. /etc... of a working LDAP Server in a tar.gz?

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Debian Configuration :: DHCP Server With External Dns Name Server

Jun 14, 2011

I wanted to setup my server as a router/gateway just for educational purposes and also when it succeeded i will keep the gateway and place it on the front line right after my modem.

My current setup as it is now :

The GATEWAY/ROUTER will be doing the main work to act as a dhcp server and firewall.

Now my setup as it is now :

So now what i ment to do was :

Let the clients connect to the gateway via ETH1 and all the stuff being router to ETH0 which is the NIC that is connected to the internet.

But now i have two huge problems :

1. The DHCP configuration seems to be fine the client machines get their ip adresses and /etc/resolve.conf looks fine to. But somehow the GATEWAY/ROUTER wont let me use the specified external DNs server so i cant do anything on these machines.

2. The firewall script [url] at line 27 should be DROP but if i use this line of code the GATEWAY/ROUTER cannot use his dns server settings so when i try to browse the internet or ping a machine outside my local network it would came up with nothing.

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Server :: (OpenSuse 11.2) Installation And Configuration Of Web / Mail Server?

Feb 16, 2010

I am hoping to find some much needed help here. I have been to various other sites and am beginning to think that I am not meant to have a server of my own.

I was told that OpenSuSE was good for beginners. So far, I am wondering.I am trying to set up a home network ( 2 laptops, 1 desktop. The laptops are wireless )

I'd like to set up a web server to run a personal webpage or two and maybe a forum, shoutcast server and IRC at some point down the road after I figure out the first two.

I found a guide, but it was for 64 bit and wanted me to install ISPConfig 3 ( Which, obviously I don't need )

I would like some basic, beginner help on installation, configuration and whatnot on setting up a web-server and mail server.

Yes. I have a static IP ( leasing an IP block from my ISP ). Yes, they allow me a web-server and mail server ( I had to get the IP block to do so ) and I have my own domain name to use.

On the various attempts, I managed to get apache working. ( When I visit my domain name, it says "IT WORKS!" which is nice and all, but I am use to using Cpanel and have no clue how to setup / edit a website outside of a panel ( or even FTP )

I think I got the mail server installed, but again ( as with the web server ) have no clue how to setup / configure and use it.

I either am using the wrong search words for help or asking incorrectly or something. This is my final stop. I am at the point of just forgetting it, chalking it up to a lost cause.

I do hope someone here is willing to be patient with me and help me through it all. I will even give link backs and Kudos to this site if it all works out.

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Ubuntu Networking :: Broken Networking After OpenVPN Configuration Attempt?

Jul 13, 2011

I have been trying to set up openVPN on a Virtual Machine running Ubuntu 10.04 with the eventual intention of having a closed VPN in the workspace I'm at, and a bridged internet connection out through the server.My initial process/instinct was to go through Webmin. After a fair bit of tooling around making eys/certificates, I was able to get a response (and that's all it was, really) from my windows machine accessing the VPN server. However, in my attempt to bridge the network, I have lost all internet/networking capabilities from the server.Fortunately I am able to access the server directly from the hardware underneath (i.e. I don't need to SSH in or anything), and so I've been attempting to restore the server's networking back to default. I have returned the /etc/network/interfaces file to it's original state (just the loop, and an eth0 on dhcp) and restarted the networking. A check with ifconfig returns what seems to be a working eth0, and the loop (noting else) however I am unable to ping any outside server. When I do, I am given the message:From XXX.XXX.XXX.XXX icmp_seq=1 Destination Host Unreachable(where of course XXX is my IP address).nother VM on the server is able to access the internet just fine, so it's not the overall server hardware...I guess at this point I'm just trying to take steps back,

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Server :: LDAP Server Configuration In CentOS

Jun 15, 2010

How to setup Ldap Service in RHEL5/CentOS5?

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Server :: RAID Configuration For New Home Server

Jun 1, 2010

I have a new home server I built this weekend with 4 x 320 GB Seagate Barracuda SATA drives. I am going to load my O.S. this week however I don't have a RAID controller so I would like to utilize 'Software RAID' via 'mdadm' package. My question is since this is a general home server with no specific function rather than hold my data reliabily and resonably fast, how do you guys recommend I configure my partitions for RAID? What level would be best with my 4 drive configuration? RAID5 or RAID10? Should I use a 3 drive RAID and use the 4th as a spare? Please let me know what you recommend as I don't have a lot of expertise with what is not practical or useless when it comes to Mdadm RAID.

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Server :: Http Error "Invalid Command 'JkSet', Perhaps Misspelled Or Defined By A Module Not Included In The Server Configuration"

Feb 11, 2011

I am running apache httpd-2.2.3-43.el5.centos.3 When i restart the http, it says the following error "Invalid command 'JkSet', perhaps misspelled or defined by a module not included in the server configuration "

Do I need to install anything like tomcat? or include any configuration setting in apache? kernel version: 2.6.18-194.32.1.el5

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