On Fri, Oct 22, 2010 at 10:58:34AM +1100, Nat N wrote: > On Thu, Oct 21, 2010 at 9:52 PM, Nat N <phenisha@xxxxxxxxx> wrote: > > Hi List, > > > > I am running a x86_64 Centos server, after a reboot the network has decided to > > not work.. this particular machine has 8 eth ports eth0-7. eth0 and eth3 were > > bonded (mode 1 ) after reboot the bond did not work. It came up OK but no > > data was passing through it. all other interfaces on the machine were working. > > > > I decided to remove the bond, so after removing the bond i was left with eth0 > > using the same IP as the bond used. however it still does the same thing, > > it starts up with no errors but i cannot even ping the default gateway, > > tcpdump shows nothing on the interface. > > > > I have made sure of the following > > * no iptables installed > > * kernel modules for the NIC are loaded with no errors > > * the bond kernel module is not installed / all bond configs have been removed > > > > Below is some info on the interface, it should be noted that all others are OK > > the only 2 that were having the issue are eth0 and eth3 (the ex-bonded ones) > > > > server1:/etc/sysconfig/network-scripts# ip route | grep 172.18 > > 172.18.16.0/24 dev eth0 proto kernel scope link src 172.18.16.1 > > default via 172.18.16.254 dev eth0 > > > > > > # ifconfig eth0 > > eth0 Link encap:Ethernet HWaddr 00:24:49:C8:66:98 > > inet addr:172.18.16.1 Bcast:172.18.16.255 Mask:255.255.255.0 > > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > > RX packets:0 errors:0 dropped:0 overruns:0 frame:0 > > TX packets:7223 errors:0 dropped:0 overruns:0 carrier:0 > > collisions:0 txqueuelen:1000 > > RX bytes:0 (0.0 b) TX bytes:463918 (453.0 KiB) > > Interrupt:226 Memory:dc000000-dc012800 > > > > > > If you look closely TX and RX are massively different, but I am not > > seeing anything on tcpdump even there is a large number of TX packets. > > > > Just some more information on this issue. > > I have tried different kernels and the same issue is still occurring. > > # ethtool eth0 > Settings for eth0: > Supported ports: [ TP ] > Supported link modes: 10baseT/Half 10baseT/Full > 100baseT/Half 100baseT/Full > 1000baseT/Full > Supports auto-negotiation: Yes > Advertised link modes: 10baseT/Half 10baseT/Full > 100baseT/Half 100baseT/Full > 1000baseT/Full > Advertised auto-negotiation: Yes > Speed: 1000Mb/s > Duplex: Full > Port: Twisted Pair > PHYAD: 1 > Transceiver: internal > Auto-negotiation: on > Supports Wake-on: g > Wake-on: d > Link detected: yes > > #mii-tool -v eth0 > eth0: negotiated, link ok > product info: vendor 00:08:18, model 54 rev 6 > basic mode: autonegotiation enabled > basic status: autonegotiation complete, link ok > capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD > advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control > > > I am still racking my brains on what is causing this Maybe you have problem with switch configuration instead of system one. -- Dominik Zyla
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