Date: Fri, 20 Oct 2000 14:18:56 -0700 (PDT) From: Rudy <rudy@monkeybrains.net> To: freebsd-net@freebsd.org Subject: arp and bridging Message-ID: <Pine.BSF.4.21.0010201339400.71388-100000@pizza.monkeybrains.net>
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Here is my setup:
lala <---> bridge <---> pizza
Problem: 'pizza' cannot always access lala.
One ip occationally moves from one MAC to another, there are three
things which make this 'wierd':
1) If I scan my whole network (namp -sP '209.21.40.*') to prime the
current ARP entries, and then do a arp -a, that '00:a0:c9:f2:fc:63'
MAC doesn't show up.
2) Another wierd thing: half the MAC address is the same
00:a0:c9:f2:fc:63 (phantom MAC)
00:d0:b7:1f:fc:63 (actual lala address)
3) And finally, in /var/log/messages lala and bridge, no arp
complaints show up. Only pizza gets confused.
4) The MAC move only lasts a few minutes and occurs about
once a day.
Right now, I am doing a make world on the bridge box to bring it up to
date.
pizza: FreeBSD 4.1.1-STABLE #0: Mon Oct 16 21:19:46 PDT 2000
lala: FreeBSD 3.5-STABLE #0: Wed Jul 5 16:57:58 PDT 2000
bridge: 4.1-STABLE #0: Thu Sep 7 16:19:48 PDT 2000
bridge# sysctl -a | grep bridge
net.link.ether.bridge_cfg: fxp0:1,xl0:1,xl1:1,
net.link.ether.bridge: 1
net.link.ether.bridge_ipfw: 0
net.link.ether.bridge_ipfw_drop: 0
net.link.ether.bridge_ipfw_collisions: 0
/var/log/messages:
Oct 13 02:57:07 pizza /kernel: arp: 209.21.40.3 moved from
00:d0:b7:1f:fc:63 to 00:a0:c9:f2:fc:63 on fxp0
Oct 13 03:11:39 pizza /kernel: arp: 209.21.40.3 moved from
00:a0:c9:f2:fc:63 to 00:d0:b7:1f:fc:63 on fxp0
Oct 13 06:27:06 pizza /kernel: arp: 209.21.40.3 moved from
00:d0:b7:1f:fc:63 to 00:a0:c9:f2:fc:63 on fxp0
Oct 13 06:34:25 pizza /kernel: arp: 209.21.40.3 moved from
00:a0:c9:f2:fc:63 to 00:d0:b7:1f:fc:63 on fxp0
Oct 17 01:11:37 pizza /kernel: arp: 209.21.40.3 moved from
00:d0:b7:1f:fc:63 to 00:a0:c9:f2:fc:63 on fxp0
Oct 17 01:17:18 pizza /kernel: arp: 209.21.40.3 moved from
00:a0:c9:f2:fc:63 to 00:d0:b7:1f:fc:63 on fxp0
Oct 19 04:27:36 pizza /kernel: arp: 209.21.40.3 moved from
00:d0:b7:1f:fc:63 to 00:a0:c9:f2:fc:63 on fxp0
Oct 19 04:45:54 pizza /kernel: arp: 209.21.40.3 moved from
00:a0:c9:f2:fc:63 to 00:d0:b7:1f:fc:63 on fxp0
Oct 20 06:42:28 pizza /kernel: arp: 209.21.40.3 moved from
00:d0:b7:1f:fc:63 to 00:a0:c9:f2:fc:63 on fxp0
Oct 20 06:57:00 pizza /kernel: arp: 209.21.40.3 moved from
00:a0:c9:f2:fc:63 to 00:d0:b7:1f:fc:63 on fxp0
Oct 20 10:42:26 pizza /kernel: arp: 209.21.40.3 moved from
00:d0:b7:1f:fc:63 to 00:a0:c9:f2:fc:63 on fxp0
Oct 20 10:49:27 pizza /kernel: arp: 209.21.40.3 moved from
00:a0:c9:f2:fc:63 to 00:d0:b7:1f:fc:63 on fxp0
This is my first post to the freebsd-net list: hi!
Rudy
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