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Last active January 26, 2016 00:46
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MTU experiments with Open vSwitch - capture of ping with 8922 payload and DF=1
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gistfile1.txt
Neutron public network router interface (gateway), IPv4:
17:09:06.741464 00:1a:64:f1:e8:39 > fa:16:3e:70:09:54, ethertype IPv4 (0x0800), length 8964: (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP (1), length 8950)
10.100.52.45 > 10.100.52.102: ICMP echo request, id 4859, seq 1, length 8930
17:09:06.741542 fa:16:3e:70:09:54 > 00:1a:64:f1:e8:39, ethertype IPv4 (0x0800), length 590: (tos 0xc0, ttl 64, id 64195, offset 0, flags [none], proto ICMP (1), length 576)
10.100.52.102 > 10.100.52.45: ICMP 10.100.52.102 unreachable - need to frag (mtu 1500), length 556
(tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP (1), length 8950)
10.100.52.45 > 10.100.52.102: ICMP echo request, id 4859, seq 1, length 8930
Neutron public network router interface (gateway), IPv6:
17:10:19.654987 00:1a:64:f1:e8:39 > fa:16:3e:70:09:54, ethertype IPv6 (0x86dd), length 8964: (hlim 64, next-header ICMPv6 (58) payload length: 8910) fd00:100:52::45 > fd00:100:52:1:f816:3eff:feea:223a: [icmp6 sum ok] ICMP6, echo request, seq 1
17:10:19.655045 fa:16:3e:70:09:54 > 00:1a:64:f1:e8:39, ethertype IPv6 (0x86dd), length 1294: (hlim 64, next-header ICMPv6 (58) payload length: 1240) fd00:100:52::101 > fd00:100:52::45: [icmp6 sum ok] ICMP6, packet too big, mtu 1500
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