[GLLUG] Arp warnings

[Scott Overfield]

Both interfaces are 3com905.....as far as the layout of the network.....

<<internet 65.x.x.x>>--<<firewall appliance>>--<<building1
65.x.x.x>>-----<<DSLRouter>>----<<building2 65.x.x.x>>----<<3com
switch>>------<<3com hub>>-------<<firewall>>-------<<building2 172.x.x.x>>

-----Original Message-----
From: Adam McDougall [mailto:mcdouga9@egr.msu.edu] 
Sent: Wednesday, February 13, 2002 1:42 PM
To: Scott Overfield
Cc: linux-user@egr.msu.edu
Subject: Re: [GLLUG] Arp warnings


arp -a -d in FreeBSD will clear the arp table.  

It would probably be helpful to see it first however. 

Any idea what interface 00:04:76:bc:0e:ec is?  It appears to be a 3com.

What is the physical layout of your network like?

On Wed, Feb 13, 2002 at 01:22:57PM -0500, Melson, Paul wrote:

  If you run `arp -a` which device has the record for that IP address?
  
  Perhaps try clearing the ARP table.  Cisco makes it nice & easy (`clear
arp`), but I think for BSD/Linux you've got to use something ugly like `arp
-a | awk '{ print $1 }' | xargs arp -d` to avoid doing it all by hand.
  
  PaulM
  
  -----Original Message-----
  From: Scott Overfield [mailto:soverfield@gccmha.org]
  Sent: Wednesday, February 13, 2002 12:58 PM
  To: 'Brad Fears'; Linux-User (linux-user@egr.msu.edu)
  Subject: RE: [GLLUG] Arp warnings
  
  
  65.x.x.x 255.255.255.224, 172.x.x.x, 255.255.255.0
  
  -----Original Message-----
  From: Brad Fears [mailto:fearsb@michigan.gov] 
  Sent: Wednesday, February 13, 2002 1:08 PM
  To: linux-user@egr.msu.edu; soverfield@gccmha.org
  Subject: Re: [GLLUG] Arp warnings
  
  
  What IP addresses/netmasks did you assign to 'xl0' and 'xl1'?  The routed
  deamon won't route packets if both nics are on the same subnet.
  
  --Brad Fears
  
  >>> Scott Overfield <soverfield@gccmha.org> 02/13/02 11:46AM >>>
  Good Mornong,
  Yesterday I set up a dual-homed freebsd box as an internal firewall
between
  2 subnets on my LAN....this morning when I came in, the console was full
of
  messages like this: arp: 172.16.0.1 is on xl1 but got reply from
  00:04:76:bc:0e:ec on xl0.... Any ideas?
  
  ********************************************
  Scott Overfield
  Network Administrator
  Gratiot County Community Mental Health
  989-466-4109
  soverfield@gccmha.org 
  
  
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