>ifconfig is working the first time through.  The second time you get the
>"ifconfig: SIOCDIFADDR: Address family not supported by protocol family"
>error.  Which is why dhcp is messing it up--it configures the interface
>for dhcp discovery, then tries to do it again and gets the message.
>
>I added a printf to in_control() in netinet/in.c.  When it fails,
>ifra->ifra_addr.sin_family is zero, which is AF_UNSPEC, not AF_INET.
>Perhaps a bad initialization in ifconfig?
>
>A workaround is to define "options COMPAT_43" in the kernel config file.
>If that's defined then in_control() will default AF_UNSPEC to AF_INET.
>I tried it and nothing else fell over.

	I made the above change.  without it, it is possible to configure
	PF_UNSPEC sockaddr by using SIOCSIFADDR.
	maybe we should enable COMPAT_43 portion by default, if it bites many
	people...

itojun