John Heffner wrote:
Jeroen Massar wrote:
I wonder how many RFC's it violates. An interface must only answer ARP's
on the interface that it is configured on, not anything else.
Not true. See RFC 1122, section 3.3.4. The standard leaves this
decision up to the implementation, for good reason.
From 1122 (note the use of MAY, not MUST or SHOULD):
"
There are two key requirement issues related to multihoming:
(A) A host MAY silently discard an incoming datagram whose
destination address does not correspond to the physical
interface through which it is received.
(B) A host MAY restrict itself to sending (non-source-
routed) IP datagrams only through the physical
interface that corresponds to the IP source address of
the datagrams.
"
That's the discussion related to things like the "Strong ES" (end system) model
right? As such, isn't that discussing what _IP_ may do rather than what ARP may
do? 1122 doesn't say much about the interfaces/MAC's that should be part of a
given ARP reply. ARP seems to be RFC 826 and probably others, and the algorithm
described in 826 doesn't seem to be specific on the topic of interfaces - at
least not to my really brief read.
rick jones
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