Date: Wed, 23 Feb 2000 10:15:01 -0800 (PST) From: Archie Cobbs <archie@whistle.com> To: julian@elischer.org (Julian Elischer) Cc: dwmalone@maths.tcd.ie, myevmenkin@att.com, freebsd-current@freebsd.org, freebsd-hackers@freebsd.org Subject: Re: NETGRAPH patches (proposal) Message-ID: <200002231815.KAA87838@bubba.whistle.com> In-Reply-To: <38B3F8FC.2781E494@elischer.org> from Julian Elischer at "Feb 23, 2000 07:13:00 am"
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Julian Elischer writes: > > > > It's because all packets sent by this node should have the node's > > > > address. If you don't have it then PPPoE cannot send a packet "FROM" > > > > thia node, as it has no idea of what this node's address is. > > > > > > So.. we can have two hooks, one that sets the host address and > > > one that doesn't.. :-) > > > > In that case can we have one that also sets the destination address > > via arp? > > Now I think you are talking a separate node that implements > such a protocol. Right.. ARP is an IP-specific protocol. Ethernet nodes should have no specific knowledge of ARP. But it would be easy to create an ARP node that sat between the IP stack and an Ethernet node... it would maintain an ARP cache, and when it saw an outgoing dest IP address that was unmapped would issue an ARP request, etc. It would listen to the incoming Ethertypes for IP and ARP coming up from the Ethernet node. This brings up another point.. to really do this correctly we would also need a 802.3/802.2 node type that decoded Ethertypes and SNAP headers. It would have a "downstream" hook that connected to the Ethernet node and also hooks for "ip", "arp", "appletalk", "aarp" (AppleTalk's ARP), "ipx", "ipv6", etc. Also, it could suport generic Ethertype hooks having names of the form "0xNNNN". Probably the raw Ethernet node type should not even know about 802.3 (the standard 14 byte Ethernet header and the 60 byte minimum packet length).. -Archie ___________________________________________________________________________ Archie Cobbs * Whistle Communications, Inc. * http://www.whistle.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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