Mac OS XでFireFoxやそのExtensionsのChatZillaを使う場合にabout:configでnetwork.dns.disableIPv6のValueをfalseにしてもIPv6で接続に行きません。
昔はMac OS X上のMozillaでもIPv6で接続出来てたと想うのですが、今は駄目なんでしょうか?
gustav: {2049} ping6 ftp.netbsd.org
PING6(56=40+8+8 bytes) 2001:3e0:a01::1 --> 2001:4f8:3:7:230:48ff:fec6:9aaa
16 bytes from 2001:4f8:3:7:230:48ff:fec6:9aaa, icmp_seq=1 hlim=51 time=132.747 ms
16 bytes from 2001:4f8:3:7:230:48ff:fec6:9aaa, icmp_seq=3 hlim=51 time=121.493 ms
16 bytes from 2001:4f8:3:7:230:48ff:fec6:9aaa, icmp_seq=5 hlim=51 time=140.178 ms
16 bytes from 2001:4f8:3:7:230:48ff:fec6:9aaa, icmp_seq=7 hlim=50 time=139.974 ms
16 bytes from 2001:4f8:3:7:230:48ff:fec6:9aaa, icmp_seq=9 hlim=51 time=140.353 ms
16 bytes from 2001:4f8:3:7:230:48ff:fec6:9aaa, icmp_seq=11 hlim=50 time=137.274 ms
16 bytes from 2001:4f8:3:7:230:48ff:fec6:9aaa, icmp_seq=13 hlim=51 time=140.666 ms
16 bytes from 2001:4f8:3:7:230:48ff:fec6:9aaa, icmp_seq=15 hlim=50 time=137.621 ms
16 bytes from 2001:4f8:3:7:230:48ff:fec6:9aaa, icmp_seq=17 hlim=51 time=120.951 ms
16 bytes from 2001:4f8:3:7:230:48ff:fec6:9aaa, icmp_seq=19 hlim=51 time=120.833 ms
16 bytes from 2001:4f8:3:7:230:48ff:fec6:9aaa, icmp_seq=21 hlim=50 time=148.708 ms
16 bytes from 2001:4f8:3:7:230:48ff:fec6:9aaa, icmp_seq=23 hlim=50 time=135.852 ms
16 bytes from 2001:4f8:3:7:230:48ff:fec6:9aaa, icmp_seq=25 hlim=50 time=135.211 ms
16 bytes from 2001:4f8:3:7:230:48ff:fec6:9aaa, icmp_seq=27 hlim=50 time=137.687 ms
16 bytes from 2001:4f8:3:7:230:48ff:fec6:9aaa, icmp_seq=29 hlim=51 time=121.078 ms
16 bytes from 2001:4f8:3:7:230:48ff:fec6:9aaa, icmp_seq=31 hlim=50 time=140.282 ms
16 bytes from 2001:4f8:3:7:230:48ff:fec6:9aaa, icmp_seq=33 hlim=50 time=138.174 ms
16 bytes from 2001:4f8:3:7:230:48ff:fec6:9aaa, icmp_seq=34 hlim=51 time=121.565 ms
^C
--- ftp.netbsd.org ping6 statistics ---
35 packets transmitted, 18 packets received, 48.6% packet loss
round-trip min/avg/max/std-dev = 120.833/133.925/148.708/8.736 ms