From: fonesurj (dwinkworth@wi.rr.com)
Date: Wed Apr 04 2007 - 17:42:39 ART
Not sure what you are asking here.
In an IPv6 network, the routers will not fragment the packet. So you're
ping will fail if it is too large. In that case, you should get a
datagram-too-large ICMPv6 message back from the router that can't pass the
traffic.
So if you have dot1q tunneling "on" and for some reason that reduces your
path MTU, the ping will fail if the ping is larger than allowed. It won't
know why it failed or what kind of link caused the failure, but it will
fail.
----- Original Message -----
From: <johngibson1541@yahoo.com>
To: <ccielab@groupstudy.com>
Sent: Wednesday, April 04, 2007 10:10 AM
Subject: Re: IPv6: routers don't fragment any packet. End hosts all MUST
have path MTU discovery ?
> If we use ping to ping an IPv6 host across our lab, if we set the
> data size to test if various packet size can go through our pad,
> our routers will fragment the data according to the MTU discovery ?
>
> If there is a misconfiguration in our switches in our pad (such as
> dot1q tunneling) , the ping can not detect the misconfiguration ?
> Because the path MTU discovery will detect the packet size that
> can go through our pad lossless ? How do we know if we have MTU
> misconfiguration in IPv6 then ?
>
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This archive was generated by hypermail 2.1.4 : Tue May 01 2007 - 08:28:34 ART