Date: Mon, 21 Jun 2004 17:01:35 -0400 From: Charles Swiger <cswiger@mac.com> To: matt@example.com Cc: freebsd questions <freebsd-questions@freebsd.org> Subject: Re: Redirection with a bridge ? Message-ID: <2E739980-C3C6-11D8-BF1C-003065ABFD92@mac.com> In-Reply-To: <3514.134.210.7.179.1087850914.squirrel@134.210.7.179> References: <40D3752A.8000809@atopia.net> <40D46636.1020909@mac.com> <3514.134.210.7.179.1087850914.squirrel@134.210.7.179>
next in thread | previous in thread | raw e-mail | index | archive | help
On Jun 21, 2004, at 4:48 PM, matt@example.com wrote: > Is it possible to redirect packets that are being passed through a > bridge > based on their protocol/port, so that if a HTTP packet (port 80) goes > through the bridge, no matter what its destination is, it will be > redirected to IP address 4.3.2.1. Yes. In order to redirect packets to a different IP address, you have to rewrite those packets, which is what natd or ipnat do, working at layer 3. > Thats what I'm trying to solve. I know that you can do the above > successfully if you are using a NAT (ipnat) or if you are doing routing > (IPFW's forward command), but is it possible to do it with a bridge? Bridging works at layer-2. Without using NAT, bridging alone will forward the traffic but not change the destination IP to 4.3.2.1. Note that the IPFW forward command redirects traffic via a specific outbound interface, it does not perform layer-3 routing (ie, your traditional IP stuff using netmasks, gateways, and the local routing table that most people mean by the word "routing"). -- -Chuck
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?2E739980-C3C6-11D8-BF1C-003065ABFD92>