 | | | strange network problem | strange network problem 2004-02-10 - By Pete Nesbitt
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On February 9, 2004 08:45 pm, Xu Congyuan, Patrick wrote:
> I am upgrading from redhat 8 to redhat el es 3. I have problem with the
> netowrk.
>
> This server has two network cards installed. One is connected to our
> internal network. The other one is connected to internet.
>
> The problem is with the external network.
>
> When the server is up for a while, the external network is down. It
> means it cannot be accessed via its external ip address. The internal
> network is working fine.
>
> I found out the external network can be resumed by "ifdown eth1; ifup
> eth1 ", which means to restart the network card.
>
> When the external network is down, I run "ifconfig ", and the result
> shows eth1 is "UP " and working. I really cannot figure out what caused
> this problem. Now what I can do is to restart the "eth1 " every 10 minutes.
>
> Any suggestion?
>
> The result of "ifconfig " is shown below.
>
> eth0 Link encap:Ethernet HWaddr 00:03:47:F1:94:5A
> inet addr:192.168.42.248 Bcast:192.168.42.255
> Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:22271 errors:0 dropped:0 overruns:0 frame:0
> TX packets:9294 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:3229764 (3.0 Mb) TX bytes:2858019 (2.7 Mb)
> Interrupt:10 Base address:0x1400 Memory:fe7e0000-fe7e0038
>
> eth1 Link encap:Ethernet HWaddr 00:03:47:F1:94:5C
> inet addr:202.73.42.108 Bcast:202.73.42.111
> Mask:255.255.255.248 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:20886 errors:0 dropped:0 overruns:0 frame:0
> TX packets:12747 errors:0 dropped:0 overruns:0 carrier:0
> collisions:4 txqueuelen:1000
> RX bytes:3119008 (2.9 Mb) TX bytes:5289086 (5.0 Mb)
> Interrupt:5 Base address:0x1440 Memory:fe780000-fe780038
>
> lo Link encap:Local Loopback
> inet addr:127.0.0.1 Mask:255.0.0.0
> UP LOOPBACK RUNNING MTU:16436 Metric:1
> RX packets:200665 errors:0 dropped:0 overruns:0 frame:0
> TX packets:200665 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:19471584 (18.5 Mb) TX bytes:19471584 (18.5 Mb)
Hi,
I had a similar problem a few years ago with a newly build firewall. It turned
out I was blocking dhcp updates. Check your firewall. Although every 10
minutes sounds a little short for a dhcp problem.
Hope that helps.
--
Pete Nesbitt, rhce
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