CentOS 5 Networking :: Configuring A VPN On Centos?
Jul 10, 2009
I have to servers online, both are connected to a virtual rack and both have public inet IPs. The thing is that I want the communication between the servers to be handled locally. This is my ifconfig from one of my servers,
eth0 Link encap:Ethernet HWaddr x:x:x:x:x:x
inet addr:x.x.x.x Bcast:x.x.x.x Mask:255.255.255.248
inet6 addr: fe80::21d:9ff:fef1:e665/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:114342 errors:0 dropped:0 overruns:0 frame:0
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Mar 22, 2010
Recently my motherboard went out, I replaced it and booted centos 5. All went well except sound, video tuners and netoworking. The sound I re-configured, and have gotten tuners working but I am running into trouble with the new network card. The networking setup is;
DSL wireless router/modem IP 192.168.0.1 connected to XP computer through WIFI IP 192.168.0.3. all set to subnetmask 255.255.255.0 and with DNS servers 192.168.0.1 and 205.171.3.25 the XP computer is the only one that supports my wifi card. On wired LAN I share that connection to 4 devices. 3/4 work well, my cent os 5 box will not connect. here are the lan settings:
win xp: IP 192.168.0.60 255.255.255.0
mac 8.6: IP 192.168.0.34 255.255.255.0
blueray: IP 192.168.0.65 255.255.255.0
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Jan 24, 2011
i've got a select based application that wants to support a large number of mostly idle connections. the code is java and works on windows, suse enterprise linux, mac os x. it does not work on centos 5.5 (32-bit, 2.6.18 kernel, 1G of memory).
i've read and followed the directions in various articles about tuning linux for large numbers of connections (including the C10K problem), and gotten the number of sockets up to 3200.
these didn't make any apparent difference:
[URL]
on windows, i can get up to around 78,000.
on suse enterprise linux (a few years ago), i got up to 90,000. that's where i got bored and stopped.
on my mac laptop with os x (snow leopard), i got up to 10,500.
i have used ulimit -n 10240
my current goal is 10k sockets.
the test is that i'm opening one socket at a time until it fails. when it fails, many of the sockets which have already been opened also fail, in one giant cascade. sounds like a buffer / memory problem.
each group of 64 sockets gets a thread to manage select calls for them. thus i'm only using around 61 threads total when it fails.
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Mar 31, 2011
configuring DHCP server with two NICs. I need DHCP server with 2 NICs:
eth1 - 192.168.103.11
eth2 - 192.168.123.11
The client also has two NICs and suppose to receive ip addresses eth1 from 192.168.103.0 and eth2 from 192.168.123.0 Here is the dhcpd.conf from dhcp server:
ddns-update-style interim;
authoritative;
ignore client-updates;
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Feb 16, 2010
I've search for info on configuring ndiswrapper for the BCM4318 Wireless card. All I've been able to find is information on Ubuntu and Debian, which don't seem to use the same methods for configuration. Has anyone configured ndiswrapper for this or any wireless card on CentOS 5? I've installed 5.4.
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Nov 15, 2009
I have a desktop that has a d-link DWL-520 wireless card, which was working under Windoze. Today I installed Centos 5.4 on the system , which went cleanly. I then used Network Configuration to set up the wireless card. I specified to use DHCP, set the SSID and authentication password. When I tried to activate the card I get these error messages
Error for wireless request "Set Mode" (8B06): SET failed on device wlan0 ; Operation not supported. Error for wireless request "Set Encode" (8B2A): SET failed on device wlan0 ; Invalid argument. Error for wireless request "Set Encode" (8B2A): SET failed on device wlan0 ; Invalid argument. Determining IP information for wlan0.
The hardware manager seems to have correctly identified the card and chipset, (Intersil Prism 2.5) and installed driver hostap_pci which came with the distro. This web site seems to suggest that this is the correct driver: [URL] searching forums I've found a few references to these errors, but they were from several years ago, and for different distros and cards. I did find a reference to using Network Manager to configure the card instead of Network Configuration. I started the NM service and configured a connection using it instead, but still no luck.
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Aug 12, 2010
I'm trying to configure SNMP service to send traps to SNMP server. I've installed net-snmp-utils, now I need to configure the "snmpd.conf" file...
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Oct 5, 2009
I installed syslog-ng-3.0.3-1.rhel5.i386.rpm and at first blush it appears to be working fine to /var/log/messages. However it doesn't seem to be doing any other ancillary logging as defined in syslog-ng.conf (I've had to mod /etc/init.d/syslog-ng to look in /etc). e.g.
destination d_auth { file("/var/log/secure"); };
filter f_filter3 { facility(authpriv); };
log { source(s_sys); filter(f_filter3); destination(d_auth); };
I'm using a syslog-ng.conf which has served me well in the past (v1.6.9 on fedora).
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Aug 11, 2010
where i can learn configuring DNS and apache
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May 7, 2010
I have installed CentOS in multi-boot set up.when i am trying internet thru win7,its working fine but when i am tryin to connect using CentOs,its not working.I have tried and changed the mac address to the one that is on windows(this worked fine with ubuntu) but the issue remains in CentOS.
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Jul 31, 2011
I installed the Centos 5.5 on a WM instance. Run out of space after doing the updates. It is very difficult to keep re-partitioning /
I tried to install a new instance but it doesn't let me configure the disc and it just goes and install the OS.
How can I use the good old installation options etc?
What happened to control? This became a control nightmare.
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Feb 10, 2009
Am using Icefaces1.7.2 in tomcat5.5.23 in Centos5( jdk 1.6.06 and jre 6u11 and no X window system in my server ).. Am getting the error(java.lang.Error: Probable fatal error: No fonts found) when am using the functions getFontMetrics() and drawString() methods in my Captcha Image Generation programs. I am only using the fonts that me retrieved using ge.getAllFonts() ( i.e., the fonts available in the system ).
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May 13, 2009
I've got a server with several different virtual hosts on them, e.g. host1.com, host2.com, host3.com.
Is there a way I can set up an email alias just for an individual domain?
e.g. I want to set up help@host2.com, but not to have help@host1.com or help@host3.com.
I can't see how to do this in the /etc/aliases file...
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Jun 30, 2011
I've installed CentOS 5.6 to my laptop, primarily to use some simulation programs. With much help of google I'm getting my hardware and software to work quite well, but I still have some troubles.My first problem is my Synaptics-Touchpad. It is extremely sensitive and I am not able to scroll. Is there any application which allows me to configure it properly? Before CentOS, I've tried openSUSE 11.4, where there was an application especially for configuring synaptics touchpad (dont't remember the name though). In general, the "feeling" of the touchpad was way much better under openSUSE, but I can't define that properly. I have a bluetooth mouse (Dicota Blue Light) conntected to my laptop, which is working fine except for the scroll wheel, which doesn't work at all. How can I activate it?
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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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Jan 17, 2011
full steps of configuring mail server in CentOS 5.5.
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Nov 26, 2009
I am using Centos 5.4 on an Intel DG451D Main Board. Two SATA drives in RAID1 mode via the main board's built in AHCI controller. It seems to work just fine but I would like to be able to monitor the state of my drives and controller, especially during a re-build and make configuration changes etc if possible, so new drives can be added etc from within the OS. Is there a way to do this within Centos or am I stuck with using just the BIOS configuration system? Apologies if this is a stupid question - I am pretty new to this and have spent several hours trying to find a solution to my question but to no avail.
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Nov 10, 2010
i have linux server application based on centos 5 that run httpd daemon from /usr/local/pf/conf/httpd.conf which is generated from the /usr/local/pf/conf/templates/httpd.conf.apache22 file
the problem is every time i run my linux server application i am not able to access phpmyadmin unless i stop my linux server application which is stop it httpd daemon then start "service httpd start"
i have been told by forum moderator to create an alias for my phpmyadmin in Virtual Host but it stil dont work, i am not able access my phpmyadmin site
this is what i have done to solve this problem
- open /usr/local/pf/conf/templates/httpd.conf.apache22 file then look for <VirtualHost *:%%admin_port%%>
- add Alias /phpmyadmin "/usr/share/phpmyadmin" (Failed)
- add Alias /phpmyadmin /usr/share/phpmyadmin (Failed)
- add Alias /phpmyadmin "/usr/share/phpmyadmin/" (Failed)
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NB : my phpmyadmin is install on /usr/share/phpmyadmin with /etc/httpd/conf.d/phpmyadmin.conf as phpmyadmin configuration file
why i still cant open my phpmyadmin site ? or why i cant run phpmyadmin together with my linux server application because it use the same daemon (httpd daemon)
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Jul 31, 2009
On a new install of CentOS 5.3 I am trying to make the Logitech MX Revolution mouse work (I did actually succeed in configuring it by BTNX on my previous machine, but can't make btnx work now...). I am following the instructions from [url] works. However, when installing the xmacro package it complains about a missing library: libstdc++.so.6(GLIBCXX_3.4.9)(64bit). The library is available in Fedora but not in CentOS. I guess installing the Fedora library is unwise...?
Does anyone know how to make xmacro work?
Also, in xorg.conf it seems (from other posts etc) using the evdev driver for the mouse would be advisable.
However, when I change from [driver "mouse"] to [driver "evdev"] X cannot start. In the xorg.conf logfile (/var/log/Xorg.0.log) it seems like the evdev driver is not compiled:
I don't really understand the error, but it seems to me, that the evdev driver is not compiled... The evdev driver should, though, be installed (through the package xorg-x11-drv-evdev-1.0.0.5-3.el5.x86_64)
If this is right, how, then do I compile the evdev driver?
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Apr 7, 2011
If I have Redhat 5 Enterprise workstation, how can I configure it to point to Centos 5 so I can receive updates and fixes through Centos rather than paying for Redhat support ? I heard this can be done, but wasn't sure what the steps are in terms of configuring Redhat
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Feb 18, 2009
I seem to be having a strange problem configuring Piranha to load balance (Direct route) 2 ports across 2 w2k3 servers in a test environment. What is strange is that 1 of the ports are working fine but the other port doesn't work. I've read many how-to and after many frustrating hours I disabled the firewall, iptables and arptables services and one of the ports are load balanced across the 2 real servers. Here's the environment.
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I can telnet from the client to the realserves on both ports and it's works. When I telnet to the VIP only one port gets through and the other gives me "could not open connection to host port 32777 : connect failed. The configuration in Piranha for one port is the same as the other. I can't help but think that some other configuration for port 32777 was missed.
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Apr 28, 2009
I'm running a fresh install on an intel i7 system on an asus p6t deluxe v2 motherboard with the onboard NIC (Marvell Technology pci-e). I know the NIC is working as when I boot into the onboard OS that Asus provides (Asus Express Gate SSD)I have a working net connection.Booting up CentOS hangs at determining IP information for eth0 and eventually fails with the following error:PING xxx.170.30.1 from xxx.170.31.231 eth0: 56(84) bytes of data---xxx.170.30.1 ping statistics ---4 packets transmitted, o received, +3 errors, 100% packet loss, time 2999ms, pipe 3 failed.
RTNETLINK answers: file exists.
RTNETLINK answers: file exists.
RTNETLINK answers: file exists.
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Jan 27, 2009
I have a Centos 5.2 VM running under Windows 2008 Hyper-V. If I add two "legacy Nic's" and bridge them, everything appears to work fine. However, if I remove the legacy nics and replace them with two synthetic nics (linux integration components), the nics seems to function fine UNTIL I add them to a bridge.This VM will eventually be used as a DansGuardian/Squid transparent proxy for a local library. The logical layout is represented by the attached jpg image. I have also included the ifcfg- scripts for the adapters and bridge for both scenarios.It would also be useful if someone else has Hyper-V with the integration components and dual physical nics to see if they can reproduce my symptoms on their box.Legacy Adapters:
ifcfg-br0:
DEVICE=br0
BOOTPROTO=dhcp
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Jun 27, 2009
This will be a little long (having read Phil's 'how to ask questions' FAQ). I'm trying to get OpenVPN working between my CentOS server and some Windoze laptops running XP. There seems to be plenty of sample
config files available, but to date, none of them have worked for me. Pulling out my trusty Wireshark, I've found some clues,
BACKGROUND:
My local subnet (NAT'ed by my gateway router) is 192.168.52.x. My router has been configured with a conduit (port-forward) for port 1194 (the standard OpenVPN port), which points towards my CentOS server.The CentOS server is .52.112, and the supplicant is .52.110. I have tried the lient both inside and outside my local subnet, with no difference in events or outcomes.
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Jan 1, 2010
How can i add a PPPOE connection witch connect automatically on system start up in text mode in centos 5.4
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Sep 13, 2010
I've installed from the CD the Centos version 5.5. When I try to connect to Internet I can't because I received some errors. I've the Intel Corporation 82801CAM (ICH3) PRO/100 VE (LOM) Ethernet Controller also a wireless slot (I've the wireless card DWL-G650+) When I turn on the pc and I go to "Ethernet Device", I see set: peth0 (Intel Corporation 82801CAM (ICH3) PRO/100 VE (LOM) ETHERNET CONTROLLER) and also set "Bind to MAC address": fe:ff:ff:ff:ff:ff I've set manually the IP address (I'm under router). Status is "Active" but can't go on the Net. When I change to "eth0 (Intel EtherExpress/100 driver)...sometimes become "Active" an other times said that the MAC address is different or to check the cable because can't find the IP. What can I do?
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Feb 25, 2009
I'm new on Dell PowerEdge 2900. I dont know how to install centOS 5.2 on it. whice OS type that I should select. at first I select RH enterprise 5 and it format HDD. already and I put centOS 5.2 in, but it was deny and eject that cd. when I power off it shown that
"root(hd0,1)filesystem type is ext2f2,partition type0x83
kernel/linux/vmlinz%(ksLocations)
Error is : file not found
press any key to continue"
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May 4, 2009
I am using asus p5ld2-x/1333 motherboard,I installed the centos ,Centos saw other drivers but didn't see ethernet card.I am not connection the internet.
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May 12, 2009
I have installed CentOS 5.3, and updated with yum update. I have kernel 2.6.18-128.1.10.el5xen.
I can't get my wirelss network to work, I have AR928X wireles network adapter.
Do I need to install a newer kernel and install ath9k or can I just downlad a driver without updating the kernel?
I'm new to CetOS and Linux so I hope someone kan give me a step by step guide to what I can do!
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Jun 7, 2009
I want to install CentOS from netinstall CD, but it doesn't work for wireless connection, because it just looks up for eth0 connection. Well, I connected server to wired USB connection and it's named eth1. I want to use netinstall CD but using eth1 connection. Is there any way for doing it?
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