topic Re: Rare IP from ping in Operating System - Linux

Rare IP from ping

Tonatiuh — Tue, 20 Nov 2007 12:06:33 GMT

Red Hat Enterprise Linux.

I rebooted a server and put a "ping -t" to work to know when it is available again.

But, once the server is not responding (because it is rebooting) the IP responding change:

C:\>ping dev -t

Pinging dev.lc.org [172.16.18.59] with 32 bytes of data:

Reply from 201.161.22.122: Destination host unreachable.
Reply from 201.161.22.122: Destination host unreachable.
Reply from 201.161.22.122: Destination host unreachable.
Reply from 201.161.22.122: Destination host unreachable.
Reply from 201.161.22.122: Destination host unreachable.
Reply from 201.161.22.122: Destination host unreachable.
Reply from 201.161.22.122: Destination host unreachable.
Reply from 201.161.22.122: Destination host unreachable.

1) Why?
2) What does it means?

Re: Rare IP from ping

~sesh — Tue, 20 Nov 2007 12:47:00 GMT

Try the "traceroute" command to see where the network packets "hop" on their way to their destination [172.16.18.59]]. You may well get the answer. :)

Re: Rare IP from ping

Ivan Ferreira — Tue, 20 Nov 2007 12:59:56 GMT

Probably, 201.161.22.122 is the gateway that allows you to reach the remote host, and is reporting that the host is unreachable.

Check your network route table with:

netstat -nr

You should see and entry for 201.161.22.122.

Re: Rare IP from ping

skt_skt — Tue, 20 Nov 2007 20:39:17 GMT

check if you have any routing set like one below

0.0.0.0 201.161.22.122 0.0.0.0 UG 0 0 0 ethx

or add one

#route add default 201.161.22.122

or something similar

#route add -net 172.16.18.0 netmask 255.255.255.0 gw 201.161.22.122

Re: Rare IP from ping

palaniappan.sp — Wed, 05 Dec 2007 03:47:21 GMT

Hi,

First u try to get traceroute of the packet.Otherwise the Hostname to ipaddress naming may not be updated in the server and client side..

Regds
Palani