NOARP - gateway must answer and have frozen ARP table

[Bill Fenner]

Garrett and I discussed what IFF_NOARP should mean about 4-5 years
ago; we decided that it probably menat "no ARP".  We discussed
the idea of seperating it out into two flags; "Don't reply to ARP"
and "don't pay attention to ARP" but decided to wait and see what
people thought.  4-5 years is probably enough time to wait =)

My proposal: keep IFF_NOARP, but add IFF_NOSENDARP and IFF_NOREPLYARP
(or something, I'm no good at making up names).  I agree with Louie
that it makes sense for these to be per-interface as opposed to
Ruslan's sysctl.

  Bill

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