Re: Should we enable IPv6 support by default?

[Guy Harris <guy () alum mit edu>]

Carter Bullard wrote:
> I think the point is that you shouldn't have routines that are 'inherently'
> limited to IPv4 addresses, if you support IPv6.

Removing pcap_lookupnet() would break source and binary compatibility. 
I suppose libpcap 1.0 could, in theory, break both, so we could perhaps 
get rid of pcap_lookupnet().

> Tcpdump is still using pcap_lookupnet().

It's doing so in order to:

	1) implement the "-f" flag, to determine what network addresses are 
"foreign";

	2) pass a netmask to pcap_compile() so that it can implement "ip 
broadcast".

Both of those are IPv4-specific; "-f" applies only to IPv4 addresses, 
and there is no "ip6 broadcast".  Whether it's worth eliminating those 
features in a world where both IPv4 and IPv6 are used is another matter.
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