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
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