[Bug 262828] [carp] CARP arp replays with wrong src mac

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262828

--- Comment #7 from Zhenlei Huang <zlei@FreeBSD.org> ---
(In reply to Ivan Rozhuk from comment #6)

As @Gleb Smirnoff Has pointed out:
> According to RFC826, which is current standard for ARP implementations,
> the hardware address in the transmission layer does not need to match
> the hardware addrees in the ARP reply packet itself. At least I can't
> find any evidence in the RFC that it must or even should. Moreover, it
> is mentioned in the RFC that:

> "Ethernet transmission layer (not necessarily accessible to the user)"

> So, RFC states that data in the Ethernet header isn't crucial for
> the operation of address resolution protocol.

This sysctl knob is for non-RFC-compliant devices and should be default off, so
that the change will be a NOOP to existing (RFC-compliant) setups. 

The change is somewhat different than the original design of CARP protocol,
until it is proven stable enough then let's change the sysctl knob to default
on and eventually remove it.

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