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Old 06-04-2004, 04:37 PM   #1
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Question System forgets default gateway

I'm running redhat, and am having a problem with it getting confused as to what the IP of the default gateway is. My default gateway is, and everything will work fine for a while (days, maybe even weeks) then the system will stop being able to acces the internet. If I look at the cached routeing table (/proc/net/rt_cache) it has the gateway for eth0 listed as which is my wireless router, and not right. If I run "ip route replace dev eth0" the default gateway is restored to and access to the internet is restored. Can anyone suggest what I am doing wrong, and what I need to do to fix it?

Thanks in advance,
Old 06-04-2004, 05:40 PM   #2
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have you tried manually editing your /etc/sysconfig/network-scripts/ifcfg-eth0? i believe that's the file, sorry if it's not, it's been a while since i used redhat.

<edit>hi NoneTheWiser, welcome to lq. sorry i forgot that.</edit>

Last edited by Peacedog; 06-04-2004 at 05:42 PM.
Old 06-04-2004, 05:56 PM   #3
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The GATEWAY line in ifcfg-eth0 is correct, it's

What I think is happening is the system tries to send an email from a cronjob while the DSL router is down and when it can't reach the outside world, deletes/modifies the default route. All of the places I can think to look for setting the default gateway are set correctly, but when the default gateway isn't working for reasons only my ISP knows, the system changes the setting in memory. I just can't figure where it gets the value from or how to stop it.



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