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Date:      Tue, 04 May 2004 11:30:58 -0400
From:      Bill Moran <wmoran@potentialtech.com>
To:        "J.D. Bronson" <jbronson@wixb.com>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: arp issues...but WHY
Message-ID:  <4097B732.90005@potentialtech.com>
In-Reply-To: <6.1.0.6.2.20040504100337.0245c7f0@localhost>
References:  <6.1.0.6.2.20040504071343.024331b8@localhost> <200405040635.03640.kstewart@owt.com> <6.1.0.6.2.20040504091427.02457290@localhost> <200405040724.09537.kstewart@owt.com> <6.1.0.6.2.20040504092942.0245ebe0@localhost> <4097AD72.70403@potentialtech.com> <6.1.0.6.2.20040504100337.0245c7f0@localhost>

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J.D. Bronson wrote:
> At 09:49 AM 05/04/2004, Bill Moran wrote:
> 
>>> Then how do I get data from one segment to the other w/o using a 
>>> router and yet at the same time keeping 'arp' happy ?
>>
>>
>> You don't.  That's what a router does.  If you want to move data between
>> two different networks you either need a router, or you need to cheat 
>> (like
>> you currently are) and just ignore the arp messages.
>>
>> You can just turn on forwarding on the BSD machine with the two NICs 
>> and it
>> will act as a router for you.
> 
> Thanks again for all the time for explanations.
> Since everything works fine the way it is (with the arp mesgs I can turn 
> off with systcl and hence solve that) would there be any benefit for 
> turning on forwarding
> or just leaving things as they are?

If you leave both NICs plugged into the same switch, do NOT turn on
forwarding, or you get duplicates of every packet!

You'll only need forwarding if you move one of the subnets to its own
leg.

-- 
Bill Moran
Potential Technologies
http://www.potentialtech.com



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