CentOS 5 :: Setting Up Initial Networking
Mar 18, 2010
I am configuring a new installation of CentOS 5.4 with the goal of setting up a server. Ive been through the installation and set up everything that I thought that I had to setup. Im getting into CentOS because my work utilizes this distribution. I do have some debian experience, and I have used Ubuntu on both server and desktop platforms.
Now, when setting up Ubuntu, I found that I was able to get networking up much easier. During the initial installation it had asked me to choose between DHCP or manual configuration. As this is going to be a server I want it setup with a static IP. But for some reason no matter what I do I can not get the machine connected. I go so far as trying to do a 'yum update' and I can not make a connection.
A few things Ive noticed that might be applicable here . . . . .
For DNS servers, I am unsure exactly what I need to put here. My ISP is Cox. I am not sure what NS's to put there for them, so I thought that I would be able to use third party DNS servers such as OpenDNS or the Google Public DNS. I know that I have setup my debian server like that with no issues. Also when setting up my debian server it prepopulated certain areas that I am required to fill when setting up CentOS. Example, when setting up localhost.localdomain -- I would choose my hostname and local domain was prepopulated as ph.cox.net. I dont know if this is something that I have to use, or if it would change if I am using third party DNS.
My resolv.conf file looks like this
search ph.cox.net
nameserver (IP address of third party dns either opendns or google)
nameserver (IP address of third party dns either opendns or google)
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Feb 19, 2010
I just started setting up a linux box in the office...I have some experience with ssh commands but not setting up a linux system and stuff.The box is connected to our network but I have no clue how to make windows & osx talk with it. How can I go by doing that and also setting up an apache server to be able to connect through network. Right now I have apache/linux/mysql running it works when i go to localhost, but I would also like to let all the computers in office to access it. I would guess that will deal with virtual host which I know how to setup. I just need to setup an IP.
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May 27, 2009
ive just ported another system over to CentOS however when I went to run the initial set of updates using the graphical tool it asked me after downloading if I wanted to import a new public key which I dont remember ever being asked this before? Is this right or has there been a problem with my downloads?
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Nov 15, 2010
I am busy to do some tests using the Adaptec 1430sa hardware raid controler .I started the setup by generating the raid 1 aray and it worked ok .I did the regular setup of Cent Os 5.5 64 bits all worked ok but the system do not boot .When I start the box it enter the minimal grub screen .I tried to install a first time on the MBR like suggested and how it need to be done for soft raid setup .nd I tried to install it on the first cluster from the boot sequence like possible on second choice
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Nov 14, 2009
I'm trying to seup my dual ethernet card. One to go to the internet and the other to serve the LAN. Do I need a router for the NIC that will serving the LAN and another one to the NIC that will be connected to the internet? I don't want the LAN computers to connect to the internet. Can someone please give me a description on how to set this connection. And yes I will be using my server as a DHCP and DNS BIND.
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Oct 24, 2009
I am trying to learn about networking and am looking to set up a mini network between three bare bones Centos machines in Virtualbox. I set up the machines with a static IP. In the Virtualbox I am using NAT and have the IPs as follows
Centos-1
IP: 10.0.2.15
Gateway: 10.0.2.2
DNS: 10.0.2.3
Centos-2
IP: 10.0.2.16
Gateway: 10.0.2.2
DNS: 10.0.2.3
Centos-3
IP: 10.0.2.17
Gateway: 10.0.2.2
DNS: 10.0.2.3
On all machines i can ping google.com, and yum updates, but I can not ping any other machine. It says they are unreachable. NOt really sure what to do. Any help would be much appreciated.
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Apr 27, 2009
I'm setting up a LDAP server to centralize the admin of a bunch of Centos 5.2 servers. I've got the LDAP server set up. I've got my client machines reading their autofs mount tables from LDAP. Now, I'd like to get name resolution working via LDAP.
Here's what I have so far:
1) /etc/nsswitch.conf contains the line "hosts: files dns ldap"
2) /etc/openldap/ldap.conf has URI and NSS_BASE_HOSTS set up to indicate root of "hosts" subtree in LDAP database.
3) "hosts" node in database is an "orginizationalUnit" object.
4) Below "hosts" I have a number of "ipHost" nodes defined with "cn" set to host name and "ipHostNumber" set to host's IP address
This setup doesn't work. Attempting to ping a host by name locks up. If I take the "ldap" keyword off of the "hosts:" entry in the nsswitch.conf file, the ping then returns immediately with "unknown host".
I'm surprised that there isn't better information available online on how to do this. I've found bits and pieces, but nothing concise. how to get name resolution working through LDAP?
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Jul 22, 2009
how to setup a broadband connection in Centos5.. My broadband connection is over a PPPoE link
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Sep 19, 2010
I'm trying to follow the instructions here to get my dell wireless NIC working in CentOS. I've got to step 3 but when I run the make command.But it does exist, as a link pointing to ../../../usr/src/kernels/2.6.18-194.el5-i686.
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Jun 18, 2009
I am looking for a procedure to recover the initial installed state of my system with out over writing user data areas. The install procedure has the phrase "will remove all linux partitions" which interpret to mean data partitions, not just /bin and /. Additional background - Was attempting to build a 32 bit cross compile of Mozilla/Firefox on a x86_64 configuration and had a conflict with libgl. Online advice was to remove duplicate libgls from the system (that was bad advice). This led to running yum update.
When I restarted the system I know longer had wireless networking, ntfs mounts and possibly other features I had installed. Further, attempts to update, re-install, erase and reinstall have had no effect on the situation. My assumption is that I need to start with a clean install - which will be about 10-20 hours to reset all the additions I made. But I don't see another solution.
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Aug 30, 2009
Does anyone know how to install the Default KDE Desktop settings in an existing user? I copied a user's home directory from another Linux and when I added the user using adduser on the new intallation, it did not copy any of the Desktop or other .rc/.profile settings.
Is there a script that is run by adduser, or a list somewhere of the files that are needed for KDE Desktop to work correctly? Or, do I delete or rename certain files and then, what executable do I run to get the Desktop?
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Oct 15, 2009
I am using CentOS outside the GUI envirement and upon initial bootup it does not recognise the USB keyboard or mose is there a way to get them to work and recognize them on bootup?
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Aug 4, 2009
I have a Sprint U760 air card that apparently works under Linux. Sprint has a guide: "Wireless Mobile Broadband Setup Guide for Linux OS" that I am using to setup the air card. When I go through the procedure in the manual for "Setting Up PPP Using KPPP" the last task is to query the modem to see if Linux recognizes it. When I do the query I get a response "unable to open modem". I have tried going back through the PPP setup but still get the same response.
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Jul 7, 2010
i have encounter strange situation i have set all my network configuration via /etc/sysconfig/network-scripts/ifcfg-eth0 ,eth0.2 ,eth1 etc ....i have used only once Gnome network manage settings to add routing since then all my network config change although all files mention above showing the same config i have set initially and same for Gnome network Manager.
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Sep 11, 2010
I recently purchased the Linksys WMP45G wireless card for my desktop (as my router is too far for ethernet cable). I can't get it to work. The NetworkManager icon doesn't appear in the upper-right corner, despite being up-and-running. Here is some output:
[root@cwatson ~]$ uname -a
Linux cwatson.homeunix.net 2.6.18-194.11.1.el5.centos.plus #1 SMP Wed Aug 11 08:19:38 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
[root@cwatson ~]$ yum list installed "Network*"
[code]....
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Jan 18, 2011
I set up a bridge device but I can not figure out how to pass parameters into the ifcfg-vmbr0 in particular I need to pass:
maxage
ageing
fd and stp seems to be passed by DELAY=0 and STP=on the others? I have not found anything in the post, tips, docs how could I do?
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Mar 18, 2011
My internet connection is pretty fast, but the initial connection to websites take about 4-10 seconds. Sometimes I even get a "connection timed out" error. Once and if the connection is made, the website loads up pretty quickly. I have no problems with internet speed otherwise as I get pretty good speeds for downloads and torrents.
Chrome shows "sending request" and Firefox shows "looking up" during this period of apparent inactivity.
It is not a DNS problem as I have switched DNS from my default to the OpenDNS servers. Besides, everything works fine on Windows with either DNS setup.
I have also tried switching off ipv6 by adding "alias net-pf-10 off" in modprobe.conf. I even switched off ipv6 in Firefox in about:config to no avail.
Oddly, wget seems to work fast and normally. And nslookup returns results almost instantly.
I am on Arch linux with a Broadcom wireless card.
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Jan 9, 2010
I'm running Lucid Alpha 1. Installed it about two weeks ago. Until a few days ago, the wireless networking was the best I've witnessed on any o.s. However, after last Wednesday's updates, connectivity now lags about 10-30 seconds whenever I open any web-page or access the repositories via aptitude. Granted after it gets going, it's fine. I noticed this same behavior in 9.10. I tested my XP connection and found no problems. .
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Mar 28, 2010
I want to identify why my ISP is sometimes slow, and wonder how and what tools to use. The problem is as follows: While the lines are very fast, I experience that at times of day where there are presumably high traffic, a new initial connection is very slow and unstable. For example getting response from DNS is slow. And after getting the answer, getting response from a web server is also slow. Or sometimes there is no response at all, and I have to retry. Running a speed test will show high data rates. So it is only initial connection that is slow/unstable.
What is the explanation for these symptoms? Are there some tools and tests I can use to pinpoint the problem from home, without/before contacting the ISP?
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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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Nov 19, 2010
I'm setting up anonymous FTP on my VPS (just for testing purposes) and I need to copy the shared libraries needed by ls to ~ftp/bin. I'm not sure where these libraries are located.
I'm running Cent 5 i386
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Feb 12, 2009
I am trying to set up a SVN server on my centos box.
I have my box set up to do ssh/samba
I need to set up SVN but when I followed [url]
I get a 403 error.
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May 24, 2010
Is there a setting in rpm or yum to tell it to -not- do any upversioning (say from 5.3 to anything else)?
I know someone's going to ask 'why'.
1. Need to maintain close similarity to a bunch of enterprise RHEL53 boxes.
2. Don't want to enable ipv6.
3. Don't have time to QCC it.
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Feb 22, 2011
I've setup a server for a small office (10 people) before with samba domain and file server with slackware. no problem there. now am tasked to setup a samba domain and file server for 300 users in 5 different locations. I am currently given a 1u rack server and I requested for 2x1tb drives that I plan to with RAID.
Some of the offices will be connected via VPN using sonicwall. Would it be ideal for remote users to login to the server in the HQ? Am not so familiar with how other companies setup their servers if they have multiple remote sites. Am also open to setting up servers in each site but because of the currently limited manpower, i'd rather have it close by so I can work on the server remotely if needed.
are there any things that I should consider or are there any good references on setting up a corporate server? the problem now is that the company uses google's email app as their email provider, I have gotten a host to do that already. But since they use email to share files, its not very efficient, hence the file server. But since there are a lot of mobile employees and employees in different sites, I would want them to be able to access those files being shared access the company or departments also.
Then I have to consider how to backup the files and other apps that the company will be using. SInce we will be primarily using linux, we would need to do virtualize some windows based apps that they are using now.
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Nov 16, 2010
I have CentOS installed on my laptop. I hooked up my TV via VGA and it works, just not as I'd like it to. The left side (on the tv) is cut off, like the image is justified too far left. I want it to be centered, but I also want to use a different resolution. You see, I use a netbook, and thus my laptop screen is tiny, meaning some things cant fit in the same window without scrolling. I want my TV to fix that for me.
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Apr 5, 2010
as part of a course project, I need to document and demonstrate how to install and set up a Wireless adapter with CentOS 5.1.I have the following devices available:
USB NetGear WG111V2
USB NetGear MA101
Can anybody direct to me to where I can find information on where to find the drivers, and how to get set up under CentOS?
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Oct 27, 2010
I'm trying to install php / mysql on a remote Centos server.I've completed the installation stages but when I try ' php -v ' it comes up with these errors:
Code:
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/modules/mcrypt.so' - libltdl.so.3: cannot open shared object file: No such file or directory in Unknown on line 0
[code].....
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Jan 13, 2011
I'm trying to setup a couple POP accounts in CentOS. I started doing a tutorial that had me install dovecot, and now I have dovecot running but I can't connect at all.Does anyone know of a simple way to get email up and running? It seems like it should be easier than the 14 step tutorials I was finding on Google.Also, should I leave dovecot or try and remove it?
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Feb 24, 2010
I am running VirtualBox on CentOS 5.4 & am not able to connect the usb ports to the guest operating systems. When I click on the device menu & usb, the devices I have plugged in show up, but are greyed out. I had this problem on Mandriva when I first started using VirtualBox & had to put my user account in the USB group. My account is in the vboxusers group but there is no USB group on CentOS & I can't figure out how to give myself permission to the USB ports.
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Feb 7, 2010
When I login remotely with PuTTy, I can type dir --color=always and it will give me that particular directory listing in color, but then the next one is not in color (the color setting does not stick).I have tried:dir --color=yesdir --color=forcedir --color=always
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