[clug] Linux routing problem - two interfaces on same media segment, one seems isolated

steve jenkin sjenkin at canb.auug.org.au
Tue Aug 26 03:02:13 GMT 2008

steve jenkin wrote on 24/8/08 11:14 AM:
> I've inherited some machines to admin and run into a knotty
> routing/network problem - and was hoping somebody on the list might have
> had this problem or know how to fix it.

Todays' update.

eth0 on the .15 machine can now see the 172.16.x.x network.
Huh?! Since when did networks 'self-heal'?

This is working like I'd expect - but does say 'don't touch'.

I did a canonical test on the .80 machine.
(Interfaces on separate segments)
 - eth0 connected to router/firewall, only device. DHCP 192.168.x.x
 - eth1 connected to dumb 100M switch. one other device, a laptop (.67)

Initially, ping yielded 'Host unreachable' messages.
Adding 'arp' entry resolved this - but no port activity.

Huh?! This should Just Work - and has always worked for me in the past.

I'm starting to think Daniel/Alex are right - this could be dodgy
hardware (network interfaces).

Or some strangeness in the '/proc/sys/net/ipv4/conf/' :-)

Steve Jenkin, Info Tech, Systems and Design Specialist.
0412 786 915 (+61 412 786 915)
PO Box 48, Kippax ACT 2615, AUSTRALIA

sjenkin at canb.auug.org.au http://members.tip.net.au/~sjenkin

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