topic Re: Route problem in Operating System - Linux

Route problem

Prasanna_3 — Tue, 17 Aug 2004 23:04:31 GMT

Hi,,

I have this HP-UX machine in another subnetwork.
I added a route in this machine as
route add 11.255.23.0 11.255.23.1 1 and to make it permanent, I have updated netconf file.
After I do 'route -f' and '/sbin/init.d/net start' , I can telnet to this machine from the remote network for first 5 minutes.. after that I'm not able to reach this machine from a remote network.

What could be the problem..

Can these two route entries co-exist in the table ..?
results of 'netstat -rn'

11.255.23.0 Boston U 2 lan0 1500
11.255.23.0 11.255.23.1 UG 0 lan0 1500

'Boston ' is the machine that i'm working on..

Re: Route problem

Stuart Browne — Tue, 17 Aug 2004 23:47:20 GMT

Apart from the fact that it looks like you're using HP-UX and not linux from the commands and ouptuts given, here's a few words.

The destination host appears to be '11.255.23.xx' (you don't specify), and your own host 'Boston' appears to be on the same subnet.

You shouldn't need to add a gateway for local network traffic.

However, using '255' as part of your network address is just wrong, and I'm amazed it works *at all!*.

The usable range of byte values in an ip address range from 1-254 (in a standard network environment). Usually the values 0 and 255 are reserved for network/broadcast addresses and subnet mask's only.

If using smaller than 24 bit netmasks however, there can be other un-usable values.

The fact this works for a short period of time at all is the miracle.

Re: Route problem

Laurie Gellatly — Wed, 18 Aug 2004 19:05:54 GMT

What are :
1) IP address/Subnet Mask and default gateway
for Boston?
2) IP address/Subnet Mask and default gateway
for other machine?
3) routing tables for both machines?

...Laurie :{)

Re: Route problem

Jeroen Peereboom — Thu, 19 Aug 2004 02:20:28 GMT

Hmm,

duplicate question (HP-UX)
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=673118

JP