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11-11-2005 01:17 AM
11-11-2005 01:17 AM
Problem with default routing.
Hello All,
We are facing a problem with one of our Linux box. Some time I cannot connect to other system across router(Traceroute /ping doesnt work).
netstst -rn will display the proper routing setting.
But temporary workaround is , If I remove and add the default router (route delete default ; route add default gw xx.xx.xx.xx ) will solve the problem.
We will face this problem 3-4 times a week.
Is Anyone faced such problem like this ..??
Thanks ,
shashi
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11-11-2005 01:28 AM
11-11-2005 01:28 AM
Re: Problem with default routing.
When the problem occurs, you should verify the MAC associated to the IP of the router by using the arp -a command.
When the problem occurs, can you ping the router? Where the traceroute command stops?
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11-11-2005 01:37 AM
11-11-2005 01:37 AM
Re: Problem with default routing.
HI , Thank s for quick respone.I can ping the router but not the host .
Thanks & regards,
shashi
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11-14-2005 03:35 AM
11-14-2005 03:35 AM
Re: Problem with default routing.
Talk to your network people; they may have closed the port that allows ICMP packets. If so, you will be able to login to the host, but not ping it.
Regards,
Mark
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11-14-2005 05:21 PM
11-14-2005 05:21 PM
Re: Problem with default routing.
hth.
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11-15-2005 04:12 AM
11-15-2005 04:12 AM
Re: Problem with default routing.
It does not look like a router issue since you had mentioned that during such condition you are able to remove and add the default router.
- If you have redhat support you can ask them if there are any fixes for this (maybe a patch) or is this happening only on 1 server if yes
- then in that case you can try to move this to a different subnet and see (it maybe not be as easy as I'm telling ,changing subnet)but that is another option to sort the issue permanently, or
- there might be some issue with that network interface, you want to move the cable and ip to another ietrface and make sure the hardware is good.
Hope this helps
Rgds
HGN
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11-15-2005 10:26 PM
11-15-2005 10:26 PM
Re: Problem with default routing.
service iptables status
netstat -nr
arp -a
traceroute destination_host
Cheers.