Date: Sat, 03 Nov 2007 00:05:07 +0900 From: Byung-Hee HWANG <bh@izb.knu.ac.kr> To: stable@freebsd.org Cc: bind-users@isc.org Subject: [FreeBSD 7.0-BETA1] strange behavior in hostname resolving order Message-ID: <1194015907.1422.14.camel@viola.izb.knu.ac.kr>
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To Whom It May Concern: (Cc'ed bind-users@isc.org) Usually i prefer 6to4(stf(4)) to 6over4(gif(4)) because some tunnel providers like to limit bandwidth too musch. So until my upstream ISP give me native ipv6 addresses (it's take long time maybe), i'm going to use 6to4 instead of 6over4 continuous. Here is my shot using 6to4: bh@viola:~> uname -a FreeBSD viola.izb.knu.ac.kr 7.0-BETA1 FreeBSD 7.0-BETA1 #0: Fri Nov 2 12:13:10 KST 2007 root@viola.izb.knu.ac.kr:/usr/obj/usr/src/sys/GENERIC i386 bh@viola:~> ifconfig rl0 | grep 2002 inet6 2002:9be6:9d5d:2:20b:6aff:fe56:969f prefixlen 64 autoconf bh@viola:~> ping6 -c 5 mx.jp.freebsd.org. PING6(56=40+8+8 bytes) 2002:9be6:9d5d:2:20b:6aff:fe56:969f --> 2001:218:422:1::15 16 bytes from 2001:218:422:1::15, icmp_seq=0 hlim=49 time=225.297 ms 16 bytes from 2001:218:422:1::15, icmp_seq=1 hlim=49 time=224.591 ms 16 bytes from 2001:218:422:1::15, icmp_seq=2 hlim=49 time=237.175 ms 16 bytes from 2001:218:422:1::15, icmp_seq=3 hlim=49 time=230.540 ms 16 bytes from 2001:218:422:1::15, icmp_seq=4 hlim=49 time=224.681 ms --- mx.jp.freebsd.org ping6 statistics --- 5 packets transmitted, 5 packets received, 0.0% packet loss round-trip min/avg/max/std-dev = 224.591/228.457/237.175/4.889 ms bh@viola:~> traceroute6 mx.jp.freebsd.org. traceroute6 to mx.jp.freebsd.org (2001:218:422:1::15) from 2002:9be6:9d5d:2:20b:6aff:fe56:969f, 64 hops max, 12 byte packets 1 2002:9be6:9d5d:2:250:4dff:fe00:5df3 1.541 ms 0.949 ms 1.154 ms [......] 23 v6.imgsrc.co.jp 264.635 ms 226.812 ms 232.207 ms 24 castle.jp.FreeBSD.org 427.683 ms 219.659 ms 222.862 ms bh@viola:~> And from now on, i would give you one question. Why is 7.0-BETA1 different from another -RELEASE in hostname resolving order? AFAIK, at least on 6.2-RELEASE, the order is first IPv6 and then IPv4. However, 7.0-BETA1 try to lookup in first IPv4 than IPv6. Here is the evidence: bh@setaria:~> uname -srm FreeBSD 6.2-RELEASE-p8 i386 bh@setaria:~> telnet mx.jp.freebsd.org 25 Trying 2001:218:422:1::15... Connected to mx.jp.freebsd.org. Escape character is '^]'. [......] bh@setaria:~> ssh -v mx.jp.freebsd.org. debug1: Connecting to mx.jp.freebsd.org. [2001:218:422:1::15] ^C And bh@viola:~> uname -srm FreeBSD 7.0-BETA1 i386 bh@viola:~> telnet mx.jp.freebsd.org 25 Trying 210.226.20.15... Connected to mx.jp.freebsd.org. Escape character is '^]'. [......] bh@viola:~> ssh -v mx.jp.freebsd.org. debug1: Connecting to mx.jp.freebsd.org. [210.226.20.15] ^C What happended? Is there anyone to dislike IPv6 in src committers? Please let me know the correct answer to this puzzle ;; Byung-Hee -- "After super, can you drive me and the kids to New York in your car?" "That's what I came for." -- Kay Adams and Tom Hagen, "Chapter 32", page 443
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