From: Patrick McHardy <kaber@trash.net>
To: Chuck Anderson <cra@WPI.EDU>
Cc: netdev@vger.kernel.org
Subject: Re: "ping6 -M do" fragments packets
Date: Fri, 12 Oct 2007 18:00:12 +0200 [thread overview]
Message-ID: <470F9A0C.4080107@trash.net> (raw)
In-Reply-To: <20071012151841.GE3789@angus.ind.WPI.EDU>
Chuck Anderson wrote:
> I'm not subscribed, so please Cc: me on any responses. Thanks.
>
> According to the man page, ping6 should support the "-M do" option so
> never fragment packets, which I'd like to use for testing the MTU of a
> path. This option works fine for IPv4 ping, but doesn't work with
> IPv6 ping6. I can guarantee that I don't have an MTU of 63356 :-)
>
>
>>ping6 -M do -s 65527 www.kame.net
>
> Sure enough, wireshark reports fragments:
>
> No. Time Source Destination Protocol Info
> 1 0.000000 2001:468:616:8c9:213:72ff:fe74:da15 2001:200:0:8002:203:47ff:fea5:3085 IPv6 IPv6 fragment (nxt=ICMPv6 (0x3a) off=0 id=0x79)
> 2 0.000007 2001:468:616:8c9:213:72ff:fe74:da15 2001:200:0:8002:203:47ff:fea5:3085 IPv6 IPv6 fragment (nxt=ICMPv6 (0x3a) off=1448 id=0x79)
Are you using nf_conntrack_ipv6?
next prev parent reply other threads:[~2007-10-12 16:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-12 15:18 "ping6 -M do" fragments packets Chuck Anderson
2007-10-12 16:00 ` Patrick McHardy [this message]
2007-10-12 16:32 ` Chuck Anderson
2007-10-12 17:17 ` Patrick McHardy
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