Date: Fri, 27 Oct 2000 00:47:43 -0400 From: Bakul Shah <bakul@torrentnet.com> To: Nick Rogness <nick@rapidnet.com> Cc: "Richard A. Steenbergen" <ras@e-gerbil.net>, "Ron 'The InSaNe One' Rosson" <insane@lunatic.oneinsane.net>, freebsd-net@FreeBSD.ORG Subject: Re: Multihomed Routing Message-ID: <200010270447.e9R4lht14585@bacardi.torrentnet.com> In-Reply-To: Your message of "Thu, 26 Oct 2000 19:56:36 MDT." <Pine.BSF.4.21.0010261948400.29371-100000@rapidnet.com>
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> Sure that will work. However, consider the following:
>
>
>
> Network1 (2000 IP's)
> |
> |
> |---Router1
> |
> machine1---|
> |
> |---Router2 (default gateway)
>
> What happens to Router2 when machine1 is trying to access the IP's
> on Router1's network? Router2 gets clogged down sending ICMP
> redirects for Router1 back to machine1. The problem grows
> exponetially[spelling] when you add more machines to the same
> network machine1 is on.
Unless I am missing something the redirect traffic won't
grow exponentially. Machine1 will get one redirect per
destination D and will switch its route to D to go via
Router1. From then on it won't bother Router2 for D. So the
total number of redirects is
SUM(H[i]) for i = 1..number of servers,
where H[i] == number of hosts server i talks to.
So yes, there is some extra traffic but assuming your local
network is far faster than your external connections this
shouldn't be a problem (unless you send only a single packet
to each destination).
> Keep in mind, it only updates routes on machine1 for that IP...not
> the subnet...at least on WInBlows.
As per RFC 1812 a router will only generate host redirects.
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