Date: Thu, 3 Feb 2000 09:52:19 +0000 (GMT) From: Mark Powell <M.S.Powell@salford.ac.uk> To: Luigi Rizzo <luigi@info.iet.unipi.it> Cc: freebsd-net@FreeBSD.ORG Subject: Re: Can 3.4-S cope with packets not addressed to it? Message-ID: <Pine.BSF.4.05.10002030924500.26330-100000@plato.salford.ac.uk> In-Reply-To: <200002021948.UAA06935@info.iet.unipi.it>
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On Wed, 2 Feb 2000, Luigi Rizzo wrote: > > We want to force the use of our web caches. Our boundary router is a 3Com > > NetBuilder II, which we can get to forward port 80 traffic to another IP > > address. However, it does not rewrite the destination IP address in the IP > > you mean in the reply ? because otherwise how can it forward the > traffic to another address! That's why the machine has to be plugged directly into the router. The router can of course forward the packet to a directly connected IP address. On the NBII an incoming firewall filter of the form: permit next hop <ip-address-of-directly-connected-server> tcp dst=80 achieves this for http traffic. However, due to the router not modifying the destination address in a packet, the machine will then recieve a packet which is not actually addressed to it. On the face of it, this seems useless. However, I wanted to know from someone with a better grip on the networking of FreeBSD, whether it would be able to make use of this facility. Specifically to provide enforced web caching. Cheers. Mark Powell - UNIX System Administrator - Clifford Whitworth Building A.I.S., University of Salford, Salford, Manchester, UK. Tel: +44 161 295 5936 Fax: +44 161 295 5888 www.pgp.com for PGP key M.S.Powell@ais.salfrd.ac.uk (spell salford correctly to reply to me) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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