Wolfgang Bornath wrote:
>
> On Fri, Apr 06, 2001 at 01:31 -0400, Pierre Fortin wrote:
>
> > [Going back to your ealier posting, you had a UH entry overlapping the subnet;
> > have you tried deleting it? I'm not sure why a host route would even be there
> > when a net route exists...]
>
> Err... How do I delete that? Sorry, concerning net I'm a newbie.
route del 192.168.100.X (X matches what is in route table)
> > I forgot the default output of tcpdump was terse... Can you give the output of
> > "tcpdump -ex"?
>
> 1. lapmolch is pinging molch:
> [root@molch wobo]# tcpdump -ex
> tcpdump: listening on eth0
lapmolch(.2) ARPing for molch(.3):
> 10:32:06.173354 0:a0:c:14:8b:6b Broadcast arp 60: arp who-has
> molch.wolf-b.de tell lapmolch.wolf-b.de
> 0001 0800 0604 0001 00a0 0c14 8b6b c0a8
> 6402 0000 0000 0000 c0a8 6403 ffff 0000
> ffff ffff 0000 ffff 0000 ffff 0000
Since tcpdump is seeing this packet, molch does see lapmolch's ARP,
and replies here:
> 10:32:06.173432 0:50:ba:31:f:b2 0:a0:c:14:8b:6b arp 42: arp reply
> molch.wolf-b.de is-at 0:50:ba:31:f:b2
> 0001 0800 0604 0002 0050 ba31 0fb2 c0a8
> 6403 00a0 0c14 8b6b c0a8 6402
which lapmolch sees allowing it to ping, which molch sees (it's running
tcpdump):
> 10:32:06.173906 0:a0:c:14:8b:6b 0:50:ba:31:f:b2 ip 98:
> lapmolch.wolf-b.de > molch.wolf-b.de: icmp: echo request
> 4500 0054 0000 0000 4001 3153 c0a8 6402
> c0a8 6403 0800 291a 6c00 0000 827f cd3a
> 2828 0000 0809 0a0b 0c0d 0e0f 1011 1213
> 1415 1617 1819
then, for some reason molch tries to ARP itself rather than send a ping reply:
> 10:32:06.173996 0:50:ba:31:f:b2 Broadcast arp 42: arp who-has
> molch.wolf-b.de tell molch.wolf-b.de
> 0001 0800 0604 0001 0050 ba31 0fb2 c0a8
> 6403 0000 0000 0000 c0a8 6401
So molch appears to have a problem above.
Let's look at the other now...
> [.....]
>
> 2. molch is pinging lapmolch:
> [root@molch wobo]# tcpdump -ex
> tcpdump: listening on eth0
molch is ARPing for itself
> 10:37:02.071155 0:50:ba:31:f:b2 Broadcast arp 42: arp who-has
> molch.wolf-b.de tell molch.wolf-b.de
> 0001 0800 0604 0001 0050 ba31 0fb2 c0a8
> 6403 0000 0000 0000 c0a8 6401
gets no reply, tries again:
> 10:37:03.065233 0:50:ba:31:f:b2 Broadcast arp 42: arp who-has
> molch.wolf-b.de tell molch.wolf-b.de
> 0001 0800 0604 0001 0050 ba31 0fb2 c0a8
> 6403 0000 0000 0000 c0a8 6401
and again:
> 10:37:04.065234 0:50:ba:31:f:b2 Broadcast arp 42: arp who-has
> molch.wolf-b.de tell molch.wolf-b.de
> 0001 0800 0604 0001 0050 ba31 0fb2 c0a8
> 6403 0000 0000 0000 c0a8 6401
> [....]
>
> Looks like molch doesn't know who molch is?
Looks like lapmolch is probably OK; but molch is confused...
Did you make any changes to molch recently?
Pierre
> wobo
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