x11/gdm: default IPv6 disables IPv4 for xdmcp

[Joe Marcus Clarke]

On Fri, 2006-12-15 at 22:30 +0300, Boris Samorodov wrote:
> Hello All!
> 
> 
> Way back before gnome-2.14 IPv6 and IPv4 were mutual exclusive.
> Current gdm-2.16.4 behaves the same:
> 
> - gdm built with defaults listens only at udp6:
> %netstat -a | grep xdm
> udp6       0      0  *.xdmcp                *.*
> 
> - disabling IPv6 helps to listen at udp4.

GDM has been fixed so that if IPv6 support is enabled, IPv4 support will
still work iff v6 does not at runtime.  So, GDM will attempt to bind
using an IPv6 address.  Previously, if this failed, and IPv6 support was
enabled, GDM would not enable XDMCP support.  Now, it will fallback to
IPv4.

Joe

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