On 21 August 2009, at 11:33, David Horn wrote:
On Fri, Aug 21, 2009 at 1:55 AM, Doug Hardie wrote:
I have found what to me seems like a bug with ICMPv6 handling in
IPv6.
However, before submitting a PR I wanted to check to be sure that
its not a
misunderstanding on my part.
The network setup. A host (A) connected to a router (B) connected to
another host (C) on a separate network. When all are up and
running, A can
ping6 to C and gets a response. If you power off C and then do the
ping
again, tpcdump on A shows an ICMPv6 destination unreachable datagram
received from B. However ping6 does not report that back to the
user. A
ktrace of ping6 shows that it does not receive the ICMPv6
response. Its my
understanding that it should and the ping6 code seems to imply that
also. Is
this a bug?
___
What version of FreeBSD are you using ?
7.2 and 7.0.
Did you try the -v parameter to ping6 to display non-echo responses ?
(man ping6)
No - didn't notice that in either the ping or ping6 man pages before.
In a similar test I ran, I was able to get the icmp6 host unreachable
message from ping6 -v on my FreeBSD 7.2 box. (I pinged a non-existent
address/machine off an upstream router)
uname -a
FreeBSD dhorn-bsd 7.2-RELEASE-p2 FreeBSD 7.2-RELEASE-p2 #0: Wed Jun 24
00:57:44 UTC 2009
r...@i386-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC i386
dh...@dhorn-bsd:~> ping6 -v 2001:470:7:584::3
PING6(56=40+8+8 bytes) 2001:470:8:584:20e:cff:: -->
2001:470:7:584::3
64 bytes from 2001:470:7:584::1: Destination Host Unreachable
Vr TC Flow Plen Nxt Hlim
6 00 0 0010 3a 3e
2001:470:8:584:20e:cff::->2001:470:7:584::3
ICMP6: type = 128, code = 0
The other thing to potentially look at would be firewall rules, but
that is unlikely if you can see the icmp6 response in tcpdump.
No firewall involved.
Good Luck.
It would appear that this is an error, but in ping and not ping6.
Both of their man pages have exactly the same comment for -v.
However, ping does show things like Host down etc without the -v
argument. Ping6 works per the man page and does not. I don't think
that this is worth a PR though. Thanks for the help.
--Dave
___
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