Date: Fri, 24 Apr 1998 11:53:23 -0500 From: Dave Duchscher <Dave.Duchscher@net.tamu.edu> To: Luigi Rizzo <luigi@labinfo.iet.unipi.it> Cc: current@FreeBSD.ORG Subject: Re: Bridging... Message-ID: <199804241653.LAA09933@orion.tamu.edu> In-Reply-To: Your message of "Fri, 24 Apr 1998 08:07:24 %2B0200." <199804240607.IAA20557@labinfo.iet.unipi.it>
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> I am trying to see what could be the best way to implement bridging > within FreeBSD. The main app would be to connect 10/100 Mbit > interfaces in the most transparent way (I know doing packet filtering > on a 100 Mbit segment places a bit of load on the host and a > dedicated solution could be cheaper/more efficient). > > After thinking a bit, how about the following: > > + add a "linked" (or whatever name you like) command to "ifconfig" > so that you can say > > ifconfig de1 linked ed0 > > and then de1 inherits all features (ethernet and ip addresses, > aliases, netmasks...) of ed0. (Using the same ethernet addr makes > life easier when responding to ARP requests...) > > Implementing this probably requires adding a list of pointers > to the clustered interfaces in the descriptor of the parent > interface. > > + add a small table (perhaps this info is already in the arp table) > to determine on what interface is each destination. This is > used on output as follows: if the interface to use is known, > then use it, otherwise send to all interfaces which are part > of the same cluster. > > + when not configured as a bridge, interfaces are configured the > usual way (non promiscuous). Input is straightforward, output is > managed as above. > > + when configured as a bridge, just set the interfaces in promiscuous > mode, and pass incoming packets to the other interfaces in the > cluster using the usual bridging algorithms (see my bridge code on > my web page). > > Comments/opinions ? You might want to look at Drawbrdige beta. <http://drawbridge.tamu.edu/>; It may do most of what you want already. DaveD To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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