Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

I was wondering if anyone could help me narrow this problem

I have a gateway running Ubuntu server 10.04 (LTS) and I have added a new NIC to it which is a Intel PRO 1000PT GbE, bringing the interfaces to 3. The server sees the NIC, I can bring it up and assign it an IP but I can not reach anything devices off that interface.§

eth2      Link encap:Ethernet  HWaddr de:ad:de:ed:ab:ab  
          inet addr:10.10.1.1  Bcast:10.10.1.255  Mask:255.255.255.0
          inet6 addr: 056a::eeff:fafe:feee:65de/64 Scope:Link
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:3252 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2445 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:256154 (256.1 KB)  TX bytes:154118 (154.1 KB)
          Memory:efdc0000-efde0000

(the traffic seen here is from ping test from other subnets.

from dmesg

[1234567.123036] e1000e: eth2 NIC Link is Up 100 Mbps Full Duplex, Flow Control: RX/TX
[1234567.123042] 0000:02:00.0: eth2: 10/100 speed: disabling TSO
[1234567.124020] ADDRCONF(NETDEV_CHANGE): eth2: link becomes ready

the entry for eth2 in /etc/network/interfaces is

auto eth2
iface eth2 inet static
    address 10.10.1.1
    netmask 255.255.255.0
    network 10.10.1.0
    broadcast 10.10.1.255

If I try and ping the device off eth2 (a linksys wrt54gl) from the gateway it straight away gives a destination unreachable and arp -a does not return anything off the interface.

Similarly if I try and ping the interface of eth2 from a device on the network I can not and nothing showing up in arp -a

I can how ever ping eth2 (10.10.1.1) from any device off eth1

One other thing I notice in the output of ifconfig -a is that the last line of eth0 and eth1 differs from eth2 in that the former are interupt with the latter is memory

eth0      Link encap:Ethernet  HWaddr 00:00:00:00:aa:bb  
          inet addr:99.99.99.99  Bcast:99,99,99,127  Mask:255.255.255.192
          inet6 addr: eee0::bbb:21ff:fe3a:535b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:119305917 errors:0 dropped:0 overruns:0 frame:0
          TX packets:99141449 errors:1095 dropped:0 overruns:0 carrier:0
          collisions:1035730 txqueuelen:1000 
          RX bytes:2191962177 (2.1 GB)  TX bytes:3430112856 (3.4 GB)
          Interrupt:16 

eth1      Link encap:Ethernet  HWaddr 00:aa:ee:ee:dd:cc  
          inet addr:10.20.1.1  Bcast:10.20.1.255  Mask:255.255.255.0
          inet6 addr: fe80::222:aaaa:fe01:aaaa/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:126352198 errors:0 dropped:0 overruns:0 frame:0
          TX packets:159212343 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:3755860824 (3.7 GB)  TX bytes:501190807 (501.1 MB)
          Interrupt:17 

eth2      Link encap:Ethernet  HWaddr de:ad:de:ed:ab:ab  
          inet addr:10.10.1.1  Bcast:10.10.1.255  Mask:255.255.255.0
          inet6 addr: 056a::eeff:fafe:feee:65de/64 Scope:Link
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:3252 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2445 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:256154 (256.1 KB)  TX bytes:154118 (154.1 KB)
          Memory:efdc0000-efde0000

eth2 has been tested with multiple cat5 which has been tested working.

note I have sanitized some of the output

share|improve this question
    
The absence of RUNNING flag for eth2 is a bit strange. –  Mat Feb 10 '13 at 13:01

1 Answer 1

  1. Do you see anything on that interface by

    tcpdump -i eth2 -n

  2. I have no idea why this should be the case but is perhaps something wrong with the routing?

    ip route show table all

    ip rule list

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.