 | | | strange network problem | strange network problem 2004-02-10 - By crucificator
Back
Xu Congyuan, Patrick wrote:
> crucificator wrote:
>
> > 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)
> > >
> > >
> > >
> > >
> > Just a thought... Maybe APM brings down the card?
> > Look in the logs maybe you can find something strange. Although if
> > you say that the OS reports the interface as up...
> > What exactly means "a while "?
> > Ah, just saw... 10 minutes. If it 's exactly 10 minutes and occurs
> > constantly then you must realise that there is something
> > configurable. Anyway give us the output from ifconfig eth1 when your
> > connection is down and the exact occurence of the spookie thing :).
> >
> >
> >
> "A while " can be 1 minute, 10 minutes, etc. It is not fixed.
> As I have said, the result of ifconfig eth1 is showing it is "UP " when
> the external network is down.
Yes but do you still have it configured (IP, mask, gw, etc)?
>
>
> Maybe I should look into the system log file.
Maybe you should... :)
>
>
> Btw, this is my company 's web server. So I cannot afford to let it
> down. Currently I did a cron job to restart the eth1 every 10 minutes.
>
>
Brute force, ha? :)
As far as I am concerned unless you get more specific there could be a
lot of problems:
I see you have 4 collisions on eth1. What device do you have ,
topologically speaking, between your server and your ISP? Maybe you
have a switch that died on you... I 'm not sure what kind of device you
might have that is not providing L3 filtering.
Try to change your eth1 card.
Try lower your interface to 10Mbps halfduplex and see if you get the
same result.
Stop shorewall and see if this still happens.
Check at boot time for other devices that might use the same IRQ as eth0
(IRQ5).
--
redhat-list mailing list
unsubscribe mailto:redhat-list-request@(protected)?subject=unsubscribe
https://www.redhat.com/mailman/listinfo/redhat-list
|
|
|