On Mon, 5 Mar 2001, Andreas Meyer wrote:
> Very interessting stuff all this! I´m not sure about the proxyarp-stuff and
> what it means exactly; must have something to do with routing into subnets
> or something...
Proxy ARP is a kludge alternative to proper subnet routing. Let's say you
have a system connected via a serial link to another system that's also on
your LAN. There are two ways to make this work:
1) Put the serial IPs in a different subnet from the LAN, and make sure
that other systems on the LAN are aware that the LAN<->serial machine is
the gateway to the serial machine's IP. If the LAN<->serial machine is
also the default gateway, this is pretty much automatic, but otherwise it
requires some manual routing, at least on the default gateway, and perhaps
elsewhere.
2) Put the serial IPs in the same subnet as the LAN, and configure the
LAN<->serial machine to answer ARP requests for the serial IP, supplying
its own Ethernet address. Then it appears to other machines on the LAN to
be directly connected to the LAN. This is called Proxy ARP, and has some
disadvantages with respect to broadcast handling and things like
traceroute, but it's an alternative if #1 doesn't work.
Fred Wright
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