[krbdev.mit.edu #3306] kdc sends udp replies from wrong addresses, does not listen on loopback interface

[Ken Raeburn via RT]

The IP_PKTINFO code looks good, at first glance; I've been wanting to  
do the IPV6_PKTINFO bit for a long time, but didn't know about  
IP_PKTINFO.  (Is it implemented anywhere other than Linux?)

I'm a bit concerned about simply extending the RPC code to IPv6,  
especially where IPv4 address structures are part of the API; we  
should see what Sun's doing in that regard.  But the KDC  
functionality upgrade shouldn't be a problem.  Thanks for the patch!

Ken