Date: Fri, 17 Mar 2006 20:34:32 -0800 From: ray@redshift.com To: freebsd-hackers@freebsd.org Subject: strange ARP problem Message-ID: <3.0.1.32.20060317203432.00bf8a40@pop.redshift.com> In-Reply-To: <20060317192029.GB10869@odin.ac.hmc.edu> References: <441B09DA.1010902@elischer.org> <200603171502.k2HF2IV3086523@pinky.frank-behrens.de> <20060317151220.GA26987@britannica.bec.de> <441B09DA.1010902@elischer.org>
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I'm having a strange issue here and thought maybe someone on this list might
have some ideas. I have tried to figure it out for a couple of days, but no
luck yet. The problem seems to be around reporting of arp information.
Here is my basic config. I have my workstation (a windows XP box) with 2 IP's
on a private network segment (both with /24 subnet masks)
192.168.10.250
192.168.20.250
the 10.250 and 20.250 are connected out to a small switch. Also connected to
that small switch is a mail server as shown below.
[ workstation ] [ mail server ]
[192.168.10.250]-------[ small ]--------[ 192.168.10.15]
[192.168.20.250]-------[ switch ]--------[ 192.168.20.15]
|
|
[router 192.168.10.1]
|
public IP
10.15 handles SMTP to the public, 20.15 is for admin and POP to/from the
workstation on 20.250
Okay, so the problem is that when I fire up the Workstation (it's running
Windows XP), the arp data for 192.168.20.15 comes back with the incorrect Mac
address. It ends up with the Mac address for 10.15, instead of 20.15 - which
keeps the machines from talking correctly. If you delete the ARP table and
re-arp, then it's perfectly fine from then on. Totally odd.
Then the other night I noticed the following errors (see below) from the mail
server. It seems to be related, but I can't pin point the source or what might
cause something like this.
Does anyone have any ideas what could be causing this?
> arp: 192.168.10.1 is on fxp0 but got reply from 00:30:48:52:08:03 on bge0
> arp: 192.168.20.250 is on bge0 but got reply from 00:e0:81:32:e0:a0 on fxp0
> arp: 00:30:48:51:ce:f0 is using my IP address 192.168.20.15!
> arp: 00:30:48:51:ce:f0 is using my IP address 192.168.20.15!
> arp: 192.168.10.1 is on fxp0 but got reply from 00:30:48:52:08:03 on bge0
> arp: 00:30:48:51:ce:f0 is using my IP address 192.168.20.15!
> arp: 192.168.10.15 is on lo0 but got reply from 00:30:48:51:ce:f0 on bge0
> arp: 192.168.10.1 is on fxp0 but got reply from 00:30:48:52:08:03 on bge0
> arp: 192.168.10.15 is on lo0 but got reply from 00:30:48:51:ce:f0 on bge0
> arp: 192.168.20.250 is on bge0 but got reply from 00:e0:81:32:e0:a0 on fxp0
> arp: 192.168.10.15 is on lo0 but got reply from 00:30:48:51:ce:f0 on bge0
> arp: 192.168.10.1 is on fxp0 but got reply from 00:30:48:52:08:03 on bge0
here is the ifconfig from the mail server:
[ray@mail ray]$ ifconfig
fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 192.168.10.15 netmask 0xffffff00 broadcast 192.168.10.255
ether 00:30:48:51:ce:f0
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
bge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=1b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING>
inet 192.168.20.15 netmask 0xffffff00 broadcast 192.168.20.255
ether 00:30:48:51:ce:f1
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
inet 127.0.0.1 netmask 0xff000000
If anyone has any idea, please let me know. Thanks!
Ray
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