CentOS 5 Networking :: Adapter Failing Intermittently On Multiple Machine?
Jan 25, 2011
We have two recently installed centos machines, each running 5.5, and hosting an elastix pabx distro as well as a Virtual PC instance. On both machines, the network adaptor fails completely every week or so. As they are remote machines, the only option we have when this happens is a manual reboot.
I might be barking up the wrong tree here, but the only significant difference on these machines to others we have deployed is the Virtual PC instance. The machines have dual ethernet ports, with one assigned to the virtual PC. When the network failure occurs, it does not effect the virtual machine, which continues along merrily.
My expert colleague does not think so, but can anyone think of any way that our configuration could be causing the problem? If not, does anyone have any ideas on what the problem could be, or where I would start looking for information on the machine to debug the issue?
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Jul 3, 2010
I need to set a NAC (PacketFence) system (CentOS 5.5), i would like to set in my case eth0 to work with several different VLAN'S i created ifcfg-eth0.2 copied from orginal ifcfg-eth0 and changed the ip and append VLAN=yes but when i am triyng to load ifcfg-eth0.2 i get error
my ifcfg-eth0 goes as follow
# Intel Corporation 82578DM Gigabit Network Connection
# Normal VLAN Lan adapter (Managment)(On-boad 1st NIC)
DEVICE=eth0
[code]....
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Dec 8, 2009
I have a program that attaches to an interface. I can run two copies of the program on two systems (each running one instance), connect it to a switch, say 1.1.1.1 & 1.1.2.1. In this configuration two instances of the program can communicate and everything is fine.
Now, to reduce cost, it want to use only one system with two nics connected to the same switch, running two instances of the above program, each instance attached to two interfaces respectively on the system. I have the following settings:
eth1 Link encap:Ethernet HWaddr XXXXXXXXXXXXXXX
inet addr:1.1.1.1 Bcast:1.1.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
eth2 Link encap:Ethernet HWaddr XXXXXXXXXXXXXXX
inet addr:1.1.2.1 Bcast:1.1.2.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
[Code]...
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Nov 10, 2010
Is it possible to create virtual network adapter on the same physical network adapter? or How to give or have multiple MAC Address to the same adpater? I m working on centos 5.3.
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Jul 3, 2010
I need to set a NAC (PacketFence) system , i would like to set in my case eth0 to work with several different VLAN'S i created ifcfg-eth0.2 copied from orginal ifcfg-eth0 and changed the ip and append VLAN=yes but when i am triyng to load ifcfg-eth0.2 i get error
I must missed something
My ifcfg-eth0 goes as follow
Code:
My ifcfg-eth0.2 goes as follow
Code:
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Jan 21, 2010
I'm having some trouble with getting my DHCP service up and running on my server. Below is my /etc/dhcpd.conf file, which I believe is the right file necessary to get this service up and running correctly. When I do service dhcpd restart it just show in red letter [Failed] next to it.
Code:
ddns-update-style interim;
ignore client-updates;
subnet 10.2.3.1 netmask 255.0.0.0 {
# --- default gateway
#option routers 10.2.1.1;
#option subnet-mask255.0.0.0;
#option nis-domain"domain.org";
#option domain-name"domain.org";
#option domain-name-servers10.7.8.1;
option time-offset-18000;# Eastern Standard Time
#option ntp-servers192.168.1.1;
#option netbios-name-servers192.168.1.1;
# --- Selects point-to-point node (default is hybrid). Don't change this unless
# -- you understand Netbios very well
#option netbios-node-type 2;
range dynamic-bootp 10.2.3.2 10.2.3.254;
default-lease-time 21600;
max-lease-time 43200;
# we want the nameserver to appear at a fixed address
#host ns {
#next-server marvin.redhat.com;
#hardware ethernet 12:34:56:78:AB:CD;
#fixed-address 207.175.42.254; } }
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Oct 31, 2009
I have two machines, one has XP service pack2, second one has CentOS 5.3 (Linux), they are connected through crossover cable. I have configured everything fine but don't know why till now can't ping!
A. Windows machine settings as follows:
IP Address: 192.168.1.3
Subnet Mask: 255.255.255.0
Default Gatway: 192.168.1.1
+ Firewall is turned OFF.
B. For Linux machine, I will list everything stored in network files, logged as [root@localhost ~]# :
1. /etc/sysconfig/network:
ifconfig eth0 192.168.1.4 netmask 255.255.255.0 up
route add -net 192.168.1.0 netmask 255.255.255.0 eth0
route add default gw 192.168.1.1 eth0
NETWORKING = yes
NETWORKING_IPV6=no
HOSTNAME=localhost.localdomain
2. /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE="eth0"
IPADDR="192.168.1.4"
NETMASK="255.255.255.0"
ONBOOT="yes"
BOOTPROTO="yes"
3. /etc/resolv.conf
nameserver 192.168.1.4
search locadomain
4. I restarted network service using this command:
/etc/init.d/network start
everything is fine. When checking using ifconfig command. I get the following:
eth0 Link encap: Ethernet HWaddr 00:08:0D:EE:19:66
inet addr:192.168.1.4 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr:........
[code]....
I mean I assigned the IP: 192.168.1.4 to Linux machine (Eth0). I did everything above and can't ping till now, when pinging from windows or Linux I get a message "destination host unreachable" restarted Linux many times but same result. NETWORK CABLE is working fine I tested it.
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Jun 16, 2009
I have a CentOS 5.3 box with three network interfaces in it. Each interface is attached to a separate VLAN and I want traffic to stay on each network segment.What I can�t figure out is why I cannot get each interface to have its own gateway and everything gets sent through the default gateway.The basically takes my possible 3Gb total bandwidth and throws it down a single 1Gb pipe.Then on top of that, if I take down the interface (ifdown) that has the current default gateway,I loose contact to the other two interfaces.When I look at the routes, each one of the interfaces shows the gw as 0.0.0.0 and defers to the default route. So I delete the route and try to add a new route with:
[root@testsan ~]# ip route add 10.1.15.0/24 via 10.1.15.1 dev eth2
but end up with the error:
RTNETLINK answers: Network is unreachable
[root@testsan sysconfig]# cat network
NETWORKING=yes
NETWORKING_IPV6=no[code].....
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Dec 7, 2009
I have a program that attaches to an interface. I can run two copies of the program on two systems (each running one instance), connect it to a switch, say 1.1.1.1 & 1.1.2.1. In this configuration two instances of the program can communicate and everything is fine.Now, to reduce cost, it want to use only one system with two nics connected to the same switch, running two instances of the above program, each instance attached to two interfaces respectively on the system. I have the following settings:
eth1 Link encap:Ethernet HWaddr XXXXXXXXXXXXXXX
inet addr:1.1.1.1 Bcast:1.1.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
[code]....
However I cannot ping one from the other.
Neither "ping -I eth1 1.1.2.1" nor "ping -I eth2 1.1.1.1" works.
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Dec 13, 2010
I am find myself in need of building what amounts to 3 ip networks on 1 physical lan.
first LAN is another companies network on the 10.0.0.0 network a mix of pc's and equipment
second is LAN new company network 192.168.168.0/24
third network is an ip phone system for both i would like to use 192.168.200.0/24
i am hoping to use the same dhcp server to do this, assigning address to the old company's 10. network via mac address reservation.
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Feb 12, 2009
I've got a "new" Optiplex c640 coming and would like to get suggestions on a good WiFi pcmcia card for it. What works best with CentOS 5.x?
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May 10, 2009
I'm here because maybe this is a rare situation: I'm trying to mount a home server using a wireless card.
This is the output of my /sbin/lsusb code...
I'm trying to connect with this card but I don't know how.
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Oct 6, 2009
I have D-Link DWA-110 wireless usb adapter.
$/sbin/lsusb
Bus 001 Device 002: ID 07d1:3c07 D-Link System Wireless G DWA-110 Adapter
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Jun 1, 2011
had a really good reliable machine going with 10.10, but for some reason upon powering up this morning is failing to boot. Any ideas on how to fix this problem greatly appreciated, i have already tried dropping to root shell un-installing reinstalling the gnome desktop but that doesn't appear to be the problem.
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Aug 4, 2010
We are working on a project to create a display wall of 8 monitors arranged as 2 high by 4 wide. Each monitor is connected to a single machine and all machines are networked with a master machine with its own, seperate monitor.
Our goal is to get the 8 machines to share a single desktop, with the master machine acting as the server. We have looked at using Xinerama or NMM, but we are unsure about how to get started configuring the multi-machine, multi-head display.
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May 16, 2009
I have a Netgear GA311 PCI Gigabit Adapter. Any chance it might work with CentOS? It is not one of the cards listed when I do "NEW" Ethernet Adapter from the System Network menu. Maybe there is compatible choice?
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Feb 8, 2009
I just got 5.2 installed on my HP zd7000 laptop. I have a Zonet ZEW2502 USB Adapter but doesnt seem to be recognized. I tried to search in the forums and Google but didnt find any tutorial. point me in the right direction? or do I have to buy a different USB adapter?
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Jun 16, 2009
I want to add more than one Virtual IP to my CentOS machine. I was able to add one ver easily by creating a file ifcfg-eth0:1 and editing the IPADDR field. But I cannot create more by creating a ifcfg:eth0:2, for example.
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Feb 28, 2011
Installed CentOS 5.5 on VMware ESXi server running vsphere 4.1. Installed fine and picked the E1000 network adapter. But can't get the adapter to become active and pick up an IP address. Has anyone done this before? I can't get it to work. When i was testing CentOS out i used VirtualBox and worked fine using bridged networking but just can't seem to get this network card working.I've put some pictures of the config i've got.http:[url]....
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Jun 22, 2010
i have an asus eeepc that i recently upgraded from ubuntu 9.10 to 10.04. the wireless networking has worked great up until about 2 weeks ago. now it occasionally drops the connection (can't ping the gateway), even though the "blue bars" still say connected. my current solution is to click the bars, do a "disconnect", and then reconnect.i've ruled out the router being a problem (all 17 other wireless devices in my house remain connected), and i've ruled out a laptop hardware problem (when i dual boot into win7, i never lose my connection).
i'm new to linux (installed 9.10 back in february), but not new to computers/networking. i run a major campus lan [windows based] and have worked all aspects from the early mainframe days to client support to server admin to helpdesk - after 17 years, i'm now in management, so i've lost my edge a little... plus, being brand new to linux, i'm feeling a little lost in the troubleshooting aspect of this.i do believe that i've narrowed my problem down to "almost exactly" when this occurs. the wireless connection drops out as soon as i start to do "network intensive" stuff like watch a videos video, play a facebook flash game, or (and here's the kicker), try to run the update manager. unfortunately, this means that i have not been able to update for a few weeks now. i'm up to about 150mb worth of updates that are waiting.
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Jul 7, 2011
My network seems to be dropping every few minutes to few hours. There are a lot of networks in the area (apartment in NYC) and I wonder if it might be due to competing traffic. Any ideas for how to tell what channels other networks are on? or other modifications to router settings that might improve performance in this situation?Additionally the "Invalid Misc" in iwconfig is counting quite quickly.
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May 5, 2010
I just configured my (dataone) ADSL connection and now it stops intermittently. Can anyone tell me why this happens and what is the solution for this.
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Nov 7, 2010
I have done a fresh install of the OS and I am having wifi trouble. I am failing in connecting to an access point that Windows works fine with on the same machine. As far as I can tell it is connecting but not getting an IP address via DHCP. when running ifup it says its backgrounding getting an ip address.
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May 23, 2010
The wireless disconnects intermittently and asks for the WEP password again and again. The network adapter is intel wireless/pro 3945 ABG. Please let me know what I can do to avoid this issue. When using 9.10 there is no issue in wireless connection.
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Nov 15, 2010
This week I did a fresh install of Ubuntu 10.10 on a newly assembled PC. The hardware I am using is below.
My wife has a Macbook with built-in Wifi connected to our Linksys router. Previously, the connection would drop 0-2 times a day. She would turn off Wifi on her Macbook, turn it back on, and it would reconnect immediately.
Since getting my Ubuntu PC, these disconnections have become more frequent, every 30-90 minutes. They effect both computers simultaneously. And now, I MUST turn off Wifi on my Ubuntu box to regain the connection. Switching it off and on with the Mac doesn't help. Unplugging the router doesn't help. I have to run upstairs and uncheck "Enable Wireless" on the Ubuntu Network Manager outlet.
The connection doesn't seem to drop if the Ubuntu PC is sitting idle. But it can happen with web surfing, Samba file transfers, or torrent downloading.
I noticed that Encore has a linux driver for my card called RT2860. It looks very difficult to install. Ubuntu automatically uses RT2800. So I don't know if this could be a driver issue. Also, shouldn't my bit rate be more than 1Mb/s? Both the router and the card are 802.11n. Are the dmesg errors something to be concerned about?
Machine Brand and Model (PC/Laptop): Self-built Desktop. AMD Phenom, Gigabyte motherboard. Router Brand and Model: Linksys Wireless-N Broadband RouterWRT160Nv2. (I already updated the firmware to the most recent version)
[Code]...
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Dec 20, 2010
I can access my Win 7 machine from my CentOS machine, but not the other way around.
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Oct 12, 2009
Today my eth0 has intermittently shut down a couple of times without obvious cause from router or modem which appear normally lit. This happened a month or two ago soon after an update and them went away. I have unchecked ssh in the firewall settings as it is not needed but this has never been a problem. In the block of code there should be one attempt to graphically restart eth0.
[code]...
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Mar 30, 2009
I have a motherboard which has 4 x 1Gbps Ethernet controllers. I would like to use it as a Gateway for my home network. I have a static IP from my ISP which I can use to configure eth0 (I haven't done it yet as the LE-565 is currently sitting behind my Netgear router until I've got DHCP working). I would like to use eth1, eth2 and eth3 for my LAN. How do I set things up so that DHCP is handing out IP addresses on the same subnet (192.168.0.0/24) on all three interfaces?
P.S. I think what I'm asking is: how do I combine all 3 interfaces to behave like a switch (ie. just like my Netgear router)?
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Jan 7, 2010
Running CentOS 5.4 x64. Have successfully bridged eth2 with br2 by following the instructions here: [URL]../Networking (under the RHEL section) Have been running several KVM VMs successfully via this bridge.
I am now trying to bridge additional interfaces by using the same routine. Each bridge is named to correspond with the ethX device its bridged with.
Example of ifcfg-eth0 script:
DEVICE=eth0
HWADDR=00:16:76:D6:C9:45
ONBOOT=yes
BRIDGE=br0
[Code]...
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Dec 22, 2010
I have a virtual machine with two network interfaces. Now I wanted that both are part of different domains and tried to configure that with system-config-network. But there I only could change the the domain for the entire system. Is it possbile to edit the Domain for each network interface. If yes how?
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