[RHEL] [linux] RHEL/CentOS 4 networking trouble

[Meryll Larkin]

Hi Jonathan,

If this server can be out of a production loop for a period of time:  have
you considered trying to use NIC that is now eth0 to server the eth1
connection?  and the opposite?  That would help isolate if the problem was
hardware (the NIC) or software/settings.

Meryll


----- Original Message ----- 
From: "Jonathan Nicol" <jnicol at backnine.org>
To: <linux at u.washington.edu>
Sent: Friday, July 06, 2007 10:24 AM
Subject: Re: [RHEL] [linux] RHEL/CentOS 4 networking trouble


I'm trying to ping 10.254.250.225.

]# ping -I eth1 10.254.250.225
PING 10.254.250.225 (10.254.250.225) from 10.254.250.226 eth1: 56(84)
bytes of data.
 From 10.254.250.226 icmp_seq=1 Destination Host Unreachable
 From 10.254.250.226 icmp_seq=2 Destination Host Unreachable
 From 10.254.250.226 icmp_seq=3 Destination Host Unreachable

--- 10.254.250.225 ping statistics ---
7 packets transmitted, 0 received, +3 errors, 100% packet loss, time 5999ms
, pipe 4

# ifconfig eth1
eth1      Link encap:Ethernet  HWaddr 00:30:48:8E:B4:5D
           inet addr:10.254.250.226  Bcast:10.254.250.255
Mask:255.255.255.224
           inet6 addr: fe80::230:48ff:fe8e:b45d/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:55 errors:0 dropped:0 overruns:0 frame:0
           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:100
           RX bytes:4069 (3.9 KiB)  TX bytes:0 (0.0 b)
           Base address:0x6000 Memory:e0400000-e0420000


Jonathan


Quoting Gordon Messmer <gmessmer at u.washington.edu>:

> Jonathan Nicol wrote:
>>
>> # netstat -rn
>> Kernel IP routing table
>> Destination     Gateway         Genmask         Flags   MSS Window
>>  irtt Iface
>> 10.254.250.224  0.0.0.0         255.255.255.224 U         0 0
>>     0 eth1
>> 10.1.3.0        0.0.0.0         255.255.255.0   U         0 0
>>     0 eth0
>> 0.0.0.0         10.1.3.1        0.0.0.0         UG        0 0
>>     0 eth0
>
> What host are you trying to "ping"?