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Date:      Thu, 30 Aug 2001 15:50:19 +0800
From:      "Matthew P. Marino" <freebsd@citystamp.com>
To:        Edwin Groothuis <edwin@mavetju.org>
Cc:        Joshua Drake <joshdrake@mediaone.net>, freebsd-questions@FreeBSD.ORG
Subject:   Re: IP address being switched between 2 MAC addresses
Message-ID:  <3B8DF03B.52701D1F@citystamp.com>
References:  <CIEFJJFHBFDIMIFNKPDDKEGDCAAA.joshdrake@mediaone.net> <20010830111315.M29422@k7.mavetju.org>

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If you read your service agreement you'll find you probably don't want to tell
them you have a server on the wire. They monkey with addresses just for that
reason. The occasional client PC never notices. Helps root out the bandwith banditos.

Edwin Groothuis wrote:
> 
> On Wed, Aug 29, 2001 at 08:57:59PM -0400, Joshua Drake wrote:
> > connected via a cable modem. It works great until my ISP's gateway switches
> > the MAC address associated with the IP address. It switches between 2 MACs
> > on a regular basis, and when it does so, makes my web server basically
> 
> Why do they do that???? Call them and tell them not to do that :-)
> 
> In the mean time, you can set the time-out of the arp cache from
> 20 minutes (1200 seconds) to say one minute (60 seconds in case
> you're not good at math :-) to the net.link.ether.inet.max_age
> variable with sysctl:
>         sysctl -w net.link.ether.inet.max_age=60
> 
> Edwin
> 
> --
> Edwin Groothuis   |              Personal website: http://www.MavEtJu.org
> edwin@mavetju.org |           Interested in MUDs? Visit Fatal Dimensions:
> ------------------+                       http://www.FatalDimensions.org/
> 
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