[FreeBSD 7.0-BETA1] strange behavior in hostname resolving order
Byung-Hee HWANG
bh at izb.knu.ac.kr
Fri Nov 2 15:05:07 UTC 2007
To Whom It May Concern: (Cc'ed bind-users at 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 at 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 at viola.izb.knu.ac.kr:/usr/obj/usr/src/sys/GENERIC i386
bh at viola:~> ifconfig rl0 | grep 2002
inet6 2002:9be6:9d5d:2:20b:6aff:fe56:969f prefixlen 64 autoconf
bh at 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 at 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 at 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 at setaria:~> uname -srm
FreeBSD 6.2-RELEASE-p8 i386
bh at setaria:~> telnet mx.jp.freebsd.org 25
Trying 2001:218:422:1::15...
Connected to mx.jp.freebsd.org.
Escape character is '^]'.
[......]
bh at setaria:~> ssh -v mx.jp.freebsd.org.
debug1: Connecting to mx.jp.freebsd.org. [2001:218:422:1::15]
^C
And
bh at viola:~> uname -srm
FreeBSD 7.0-BETA1 i386
bh at viola:~> telnet mx.jp.freebsd.org 25
Trying 210.226.20.15...
Connected to mx.jp.freebsd.org.
Escape character is '^]'.
[......]
bh at 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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