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Last active January 26, 2016 00:47
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MTU experiments with Open vSwitch - capture of ping with 8922 payload and DF=1, increasing namespace interface MTUs
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gistfile1.txt
Router namespace, neutron public network router interface (gateway):
18:25:39.183952 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 4900, seq 1, length 8930
Router namespace, neutron private network router interface:
18:25:39.184003 fa:16:3e:34:67:40 > fa:16:3e:ea:22:3a, ethertype IPv4 (0x0800), length 8964: (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto ICMP (1), length 8950)
10.100.52.45 > 172.16.1.3: ICMP echo request, id 4900, seq 1, length 8930
Neutron private network VXLAN underlying interface, controller node end of overlay:
18:25:39.184141 00:1a:64:f1:e5:74 > 00:1a:64:f1:df:74, ethertype IPv4 (0x0800), length 9014: (tos 0x0, ttl 64, id 41884, offset 0, flags [DF], proto UDP (17), length 9000)
9.30.183.46.46263 > 9.30.183.47.4789: VXLAN, flags [I] (0x08), vni 144
fa:16:3e:34:67:40 > fa:16:3e:ea:22:3a, ethertype IPv4 (0x0800), length 8964: (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto ICMP (1), length 8950)
10.100.52.45 > 172.16.1.3: ICMP echo request, id 4900, seq 1, length 8930
Neutron private network VXLAN underlying interface, compute node end of overlay:
18:25:39.185038 00:1a:64:f1:e5:74 > 00:1a:64:f1:df:74, ethertype IPv4 (0x0800), length 9014: (tos 0x0, ttl 64, id 41884, offset 0, flags [DF], proto UDP (17), length 9000)
9.30.183.46.46263 > 9.30.183.47.4789: VXLAN, flags [I] (0x08), vni 144
fa:16:3e:34:67:40 > fa:16:3e:ea:22:3a, ethertype IPv4 (0x0800), length 8964: (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto ICMP (1), length 8950)
10.100.52.45 > 172.16.1.3: ICMP echo request, id 4900, seq 1, length 8930
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