[RFC] Use noafif in dhcpif and sycndhcpif

[Hiroki Sato]

Xin LI <delphij at delphij.net> wrote
  in <4E7A75EB.80308 at delphij.net>:

de> -----BEGIN PGP SIGNED MESSAGE-----
de> Hash: SHA256
de>
de> Hi,
de>
de> While developing FreeNAS we have hit a problem -- when
de> ifconfig_DEFAULT is set to "DHCP", all interfaces including pfsync0
de> and pflog0 would be probed by dhclient.
de>
de> It seems to be reasonable to check noafif in both dhcpif and
de> syncdhcpif, as did in ipv6_autoconfif based on same reasoning.

 I think the patch is reasonable.  Using "ifconfig -l AF" does not
 work for this purpose because 1) it depends on an already-configured
 address (ifa->ifa_addr->sa_family) on 9.X and 2) it does not work on
 8.X as intended.

 BTW, setting ifconfig_DEFAULT to DHCP may have to be revisited at a
 certain point in the future.  It works, but a problem is that this
 variable does not support a per-AF configuration and the DHCP keyword
 is IPv4-specific.  Having "ifconfig_DEFAULT_AF" may be a good
 candidate, but another issue is that it is difficult to maintain
 backward compatibility in that case...

-- Hiroki
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