(PM) Proxy Arp with 3.7.2 (fwd)

MegaZone (megazone@livingston.com)
Fri, 21 Nov 1997 02:02:51 -0800 (PST)

Once upon a time Jim Riffle shaped the electrons to say...
>I recall from the release notes for 3.7.2 something about Proxy Arp now
>being supported on the Portmaster 2E's. Is there a option we need to turn

Proxy-ARP has always been supported. The thing in 3.7.2 concerns
supernetting. We had a bug whereby we'd only proxyarp within the class
boundary for the IP on ether0 (this was normal before VLSM/CIDR allowed
supernetting). 3.7.2 just fixes that so we proxy-ARP to the entire
supernet.

>saw mention to this working if your supernet is continous. Does this
>mean, this proxy arp will not work if the class C's are not continous?

That is a fundamental ARP issue. ARP works on a contigous logical network -
period. If the class Cs are non-contiguous, then they cannot be made
into one logical network, and ARP/Proxy-ARP/RARP will not cover them.

-MZ

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