[RH9]Network stops after some time

Hi,

My network keeps stopping after some time, around a
day or something. I'll have to walk to my server and do
something to get it working again. I've disabled apmd
and didn't compile apm into the kernel. My cable between
those computers is ok so i don't have a clue on what it
could be. It worked for about 60 days until after some
time my little brother resetted the server. I don't really
want to reinstall Red Hat 9 if i don't to but if nobody
knows a solution...

I'm using my server for different purposes, it runs a dhcp
server, a ftp server, a http server, a ssh server and a mysql
server.

It is also used for masquerading on two interfaces.
eth0 = connected to ethernet adsl modem
eth1 (192.168.0.1) = connected to my pc (192.168.0.2)
eth2 (192.168.1.2) = connected to my parents pc (192.168.1.2)

I don't know if the connection fails to all network interfaces
but i don't think so. I'll try my parents computer
for some time to see if it fails there too.

I hope anyone can help me,
Thanks in advance,

Robert

Robert wrote:

> Hi,
>
> My network keeps stopping after some time, around a
> day or something. I'll have to walk to my server and do
> something to get it working again. I've disabled apmd
> and didn't compile apm into the kernel. My cable between
> those computers is ok so i don't have a clue on what it
> could be. It worked for about 60 days until after some
> time my little brother resetted the server. I don't really
> want to reinstall Red Hat 9 if i don't to but if nobody
> knows a solution...
>
> I'm using my server for different purposes, it runs a dhcp
> server, a ftp server, a http server, a ssh server and a mysql
> server.
>
> It is also used for masquerading on two interfaces.
> eth0 = connected to ethernet adsl modem
> eth1 (192.168.0.1) = connected to my pc (192.168.0.2)
> eth2 (192.168.1.2) = connected to my parents pc (192.168.1.2)
>
> I don't know if the connection fails to all network interfaces
> but i don't think so. I'll try my parents computer
> for some time to see if it fails there too.
>
> I hope anyone can help me,
> Thanks in advance,
>
> Robert

I just had time to test if it only occurs with eth1 because
it happened again :( and the result is that it only happens
with eth1, the original settings for this card in
redhat-config-network aren't changed. The network reactivates
as soon as i ping my computer from the server, plz help.

Thanks in advance,

Robert

Robert <R.Mens@hetnet.nl> wrote:

> Robert wrote:
[network stops sporadically]
>> My network keeps stopping after some time, around a
>> day or something. I'll have to walk to my server and do
>> something to get it working again. I've disabled apmd
>> and didn't compile apm into the kernel. My cable between
>> those computers is ok so i don't have a clue on what it
>> could be. It worked for about 60 days until after some
>> time my little brother resetted the server. I don't really
>> want to reinstall Red Hat 9 if i don't to but if nobody
>> knows a solution...
>>
>> I'm using my server for different purposes, it runs a dhcp
>> server, a ftp server, a http server, a ssh server and a mysql
>> server.
>>
>> It is also used for masquerading on two interfaces.
>> eth0 = connected to ethernet adsl modem
>> eth1 (192.168.0.1) = connected to my pc (192.168.0.2)
>> eth2 (192.168.1.2) = connected to my parents pc (192.168.1.2)
>>
>> I don't know if the connection fails to all network interfaces
>> but i don't think so. I'll try my parents computer
>> for some time to see if it fails there too.

Make more clear what "connection fails" mean. Is this
"only" the masqueraded Interface connection or also
*any* attempt to communicate with the server?


> I just had time to test if it only occurs with eth1 because
> it happened again :( and the result is that it only happens
> with eth1, the original settings for this card in
> redhat-config-network aren't changed. The network reactivates
> as soon as i ping my computer from the server, plz help.

Check Link/Activity-LEDs and error counters viewed by
ifconfig on both ends of the ethernet link.

Try to reproduce the error without waiting so long:

- Check whether the problem is ARP related. Clear ARP
cache on your PC and then try to ping the server.
- Move interface eth0 on your PC down and up again.
Does the interface get operational again?

Check log file whether your DHCP-Server works properly.
If in doubt disable DHCP for eth1 on server and eth0
on your PC, and use static configuration.

Check other log files on server and your PC whether
there are suspicous entries around the time of failure.

Exchange eth1 and eth2 NICs and watch whether the error
sticks with the NIC. (I got strange errors with a NIC
which sporadically failed; it still indicated with LEDs
and error counters that everything is fine, though).

If the error does not stick with the NIC, swapp cables
also between eth1 and eth2. However I don't think that
this will cause the error but it doesn't hurt to check
it.

When you get the failure, use tcpdump to sniff eth1 on
server and eth0 on your PC simultaneously. Then try
to ping from your PC the server, after this ping from
the server your PC.

If everything fails, you could use a wrong-around and
start on the server a periodically ping job pinging
your PC. Yuck, Yuck!


HTH

Ciao, Horst
--
»When pings go wrong (It hurts me too)« E.Clapton/E.James/P.Tscharn

"Horst Knobloch" <horschti2@gmx.de> schreef in bericht
news:bl41le$i1e$1@ulysses.news.tiscali.de...
> Robert <R.Mens@hetnet.nl> wrote:
>
> > Robert wrote:
> [network stops sporadically]
> >> My network keeps stopping after some time, around a
> >> day or something. I'll have to walk to my server and do
> >> something to get it working again. I've disabled apmd
> >> and didn't compile apm into the kernel. My cable between
> >> those computers is ok so i don't have a clue on what it
> >> could be. It worked for about 60 days until after some
> >> time my little brother resetted the server. I don't really
> >> want to reinstall Red Hat 9 if i don't to but if nobody
> >> knows a solution...
> >>
> >> I'm using my server for different purposes, it runs a dhcp
> >> server, a ftp server, a http server, a ssh server and a mysql
> >> server.
> >>
> >> It is also used for masquerading on two interfaces.
> >> eth0 = connected to ethernet adsl modem
> >> eth1 (192.168.0.1) = connected to my pc (192.168.0.2)
> >> eth2 (192.168.1.2) = connected to my parents pc (192.168.1.2)
> >>
> >> I don't know if the connection fails to all network interfaces
> >> but i don't think so. I'll try my parents computer
> >> for some time to see if it fails there too.
>
> Make more clear what "connection fails" mean. Is this
> "only" the masqueraded Interface connection or also
> *any* attempt to communicate with the server?
>
It is any attempt to communicate with the server, like when you down ifdown
eth1
>
> > I just had time to test if it only occurs with eth1 because
> > it happened again :( and the result is that it only happens
> > with eth1, the original settings for this card in
> > redhat-config-network aren't changed. The network reactivates
> > as soon as i ping my computer from the server, plz help.
>
> Check Link/Activity-LEDs and error counters viewed by
> ifconfig on both ends of the ethernet link.
ifconfig doesn't give any errors on the server side. Gotta try on client
soon
>
> Try to reproduce the error without waiting so long:
>
> - Check whether the problem is ARP related. Clear ARP
> cache on your PC and then try to ping the server.
> - Move interface eth0 on your PC down and up again.
> Does the interface get operational again?
>
I'll try that later
> Check log file whether your DHCP-Server works properly.
> If in doubt disable DHCP for eth1 on server and eth0
> on your PC, and use static configuration.
>
DHCP works fine, tested it in vmware and my computer has a static address.
Both fail btw when it occurs.
> Check other log files on server and your PC whether
> there are suspicous entries around the time of failure.
>
Didn't find anything in /var/log/messages

> Exchange eth1 and eth2 NICs and watch whether the error
> sticks with the NIC. (I got strange errors with a NIC
> which sporadically failed; it still indicated with LEDs
> and error counters that everything is fine, though).
>
I'll try this
> If the error does not stick with the NIC, swapp cables
> also between eth1 and eth2. However I don't think that
> this will cause the error but it doesn't hurt to check
> it.
>
I'll try this too
> When you get the failure, use tcpdump to sniff eth1 on
> server and eth0 on your PC simultaneously. Then try
> to ping from your PC the server, after this ping from
> the server your PC.
I'll try this too

> If everything fails, you could use a wrong-around and
> start on the server a periodically ping job pinging
> your PC. Yuck, Yuck!
I'm doing that now otherwise i have to walk up the stairs everytime i check
for reply's :)

> HTH
>
> Ciao, Horst
> --
> »When pings go wrong (It hurts me too)« E.Clapton/E.James/P.Tscharn