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
PING www.kame.net(orange.kame.net) 65527 data bytes
65535 bytes from orange.kame.net: icmp_seq=1 ttl=49 time=224 ms
65535 bytes from orange.kame.net: icmp_seq=2 ttl=49 time=226 ms
65535 bytes from orange.kame.net: icmp_seq=3 ttl=49 time=224 ms
--- www.kame.net ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1999ms
rtt min/avg/max/mdev = 224.118/225.270/226.909/1.251 ms
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)
3 0.000010 2001:468:616:8c9:213:72ff:fe74:da15
2001:200:0:8002:203:47ff:fea5:3085 IPv6 IPv6 fragment (nxt=ICMPv6 (0x3a)
off=2896 id=0x79)
4 0.000013 2001:468:616:8c9:213:72ff:fe74:da15
2001:200:0:8002:203:47ff:fea5:3085 IPv6 IPv6 fragment (nxt=ICMPv6 (0x3a)
off=4344 id=0x79)
5 0.000015 2001:468:616:8c9:213:72ff:fe74:da15
2001:200:0:8002:203:47ff:fea5:3085 IPv6 IPv6 fragment (nxt=ICMPv6 (0x3a)
off=5792 id=0x79)
6 0.000018 2001:468:616:8c9:213:72ff:fe74:da15
2001:200:0:8002:203:47ff:fea5:3085 IPv6 IPv6 fragment (nxt=ICMPv6 (0x3a)
off=7240 id=0x79)
Is this a known issue, or some issue with the Fedora build I'm using?
iputils-20070202-3.fc7
Thanks.
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