hi, all guys and administrators,
I have a pull request #292 about ipv6 issue on master brach

src/lib/misc.c, fr_ipaddr_cmp()

	#ifdef HAVE_STRUCT_SOCKADDR_IN6
case AF_INET6:
-    if (a->scope < b->scope) return -1;
-    if (a->scope > b->scope) return +1;
-
return memcmp(&a->ipaddr.ip6addr,

this fix according to my test configuration,
1. problem

1.1 /usr/local/etc/raddb/clients.conf, add link local client
client fe80::/16 {
    secret = cameo
    shortname = atgs950
}

1.2 /usr/local/etc/raddb/sites-available/default, open ipv6 auth and acct:
ipv6addr = :: # any. ::1 == localhost

1.3 client send auth request, server debug info as below:
Wed May 22 11:18:57 2013 : Error: Ignoring request to auth interface eth0 address :: port 1812 as server default from unknown client fe80::290:c0ff:fe82:1630 port 49153 proto udp

2. I realy think scope is not necessary as a rb-tree key, for ip address will be unique and represent the scope "global", "link", "site", and it's transport issue
3. I also found no place to parse configured address's scope id

anyone can tell me if it's code issue or not?

please help review pull request, ! thanks