Charles
At 23:10 16.07.2004, Charles Steinkuehler wrote:
Erich Titl wrote:
...The way I understand proxy arp is that the interface which is the proxy replies to arp requests for the corresponding IP.
So I have to enter all addresses of all the other interfaces to each of the interfaces for them to reply to arp requests?
Um...it's a lot simpler than I think you're trying to make it. In a nutshell:
If 'proxy-arp' is enabled for an interface and the kernel recieves an arp request for an IP address that the kernel would route out a *DIFFERENT* interface than the arp request was recieved on, the kernel 'proxys' the arp request, or answers on behalf of the IP address which would otherwise be unreachable.
Ah, that's the thing I missed.... Of course that maks it a lot easier
Now here is my problem with this set up. Two of those separate subnets/branches have a radio interface and another disjunct branch of this net connects to either of them (actually it's a train moving back and forth between two stations). The train nets are of the overall net. I have no control on how the addresses have been assigned to the net and don't know if it is subnettable at all.
<snip detail>
I don't really understand exactly how your network is numbered.
Most of it is fairly static, not necessarily contiguous, the thing I am uncertain about is the moving subnet(s) which may connect on multiple locations of the net.
Suffice it to say if you have fairly static IP allotment (regardless of how haphazard and non-subnettted), you can use either proxy-arp or bridging to connect them (although the more jumbled the IP assignments, the more routing rules required to correctly build the kernel routing table).
If your IPs are fairly dynamic (more so than would be possible to track by hand configuration changes or a routing protocol), the use of bridging is probably more appropriate.
That's what my gut feeling tells me, but your analysis helped a lot.
Thanks Erich
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