Date: Mon, 19 Sep 2005 14:08:22 -0500 From: Colin Farley <Colin.Farley@ecarecenters.com> To: matt@fruitsalad.org Cc: freebsd-stable@freebsd.org Subject: Re: Gratuitous ARP Message-ID: <OFD295A5D9.11B50917-ON86257081.006922F9-86257081.006922FB@ecarecenters.com>
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Hi Matt,
Thanks for your reply. = The model of the Cisco router is 2811. Do
you think that lowering the= timeout to 5 seconds would be ok? I have
seen that Cisco does not recommen= d a timeout below 30 seconds but
after reading your reply and seeing as the= re are only a couple dozen
hosts on this subnet I would think that thi= s would be fine. Please
confirm. Thanks again.
Colin
-----owner-freebsd-stable@freebsd= .org wrote: -----
To: freebsd-stable@freebsd.org
From: Matt Douhan <matt@fru= itsalad.org>
Sent by: owner-freebsd-stable@freebsd.org
Date: 09/19= /2005 01:54PM
cc: Colin Farley <Colin.Farley@ecarecenters.com>
= Subject: Re: Gratuitous ARP
On Monday 19 September 2005 19:31, Colin = Farley wrote:
> 1.&nbs=p; Set the arp cache timeou= t of the cisco router
very low so
> that outages a=re = minimal. I would rather not do this as
it will
> p= roblably stress th=e router too much. Unfortunately I
know little> about cisco devices so=I really cant figure this
one = out, does anyone
> think that this is a bad th=ing? &n= bsp;Can you tell a
cisco device not to
> cache arp entri= es on just the=internal interface? The
subnet
> = currently consists of about 25 hosts =so this may not be
so bad after
= > all?
Depending on your Cisco router model you will= not have any issues
whatsoever
lowering the timeout to really low, in = the region of a few
seconds.
even an old 25xx device would be to han= dle that without problems.
>
> 2. Ru= n an ANT task to =clear the cache on the cisco
device, this
> = ; task can become part of the UCARP=scripts. This may be a
go= od
> solution but security is a concern.
This wou= ld be very very bad, cause no matter how you do it the
security
concern= would be severe.
--
Matt Douhan
www.fruitsalad.org
(remem= ber, amateurs built the Ark, professionals built the
Titanic)
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