Created
January 18, 2016 02:47
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MTU experiments - capture of ping with 1372 payload and DF=1 after moving MTU mismatch
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| # ping -c 1 -s 1372 -M do 10.4.31.102 | |
| PING 10.4.31.102 (10.4.31.102) 1372(1400) bytes of data. | |
| 1380 bytes from 10.4.31.102: icmp_seq=1 ttl=63 time=3.35 ms | |
| --- 10.4.31.102 ping statistics --- | |
| 1 packets transmitted, 1 received, 0% packet loss, time 0ms | |
| rtt min/avg/max/mdev = 3.352/3.352/3.352/0.000 ms | |
| Neutron public network router interface (gateway): | |
| 20:51:39.365146 7e:27:12:8e:ab:89 > fa:16:3e:1b:0d:d3, ethertype IPv4 (0x0800), length 1414: (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP (1), length 1400) | |
| 10.4.31.1 > 10.4.31.102: ICMP echo request, id 9135, seq 1, length 1380 | |
| 20:51:39.366687 fa:16:3e:1b:0d:d3 > 7e:27:12:8e:ab:89, ethertype IPv4 (0x0800), length 1414: (tos 0x0, ttl 63, id 36256, offset 0, flags [none], proto ICMP (1), length 1400) | |
| 10.4.31.102 > 10.4.31.1: ICMP echo reply, id 9135, seq 1, length 1380 | |
| Neutron private network router interface, namespace end of veth pair: | |
| 20:51:39.365181 fa:16:3e:1d:d1:a3 > fa:16:3e:bd:bf:3f, ethertype IPv4 (0x0800), length 1414: (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto ICMP (1), length 1400) | |
| 10.4.31.1 > 172.16.1.3: ICMP echo request, id 9135, seq 1, length 1380 | |
| 20:51:39.366673 fa:16:3e:bd:bf:3f > fa:16:3e:1d:d1:a3, ethertype IPv4 (0x0800), length 1414: (tos 0x0, ttl 64, id 36256, offset 0, flags [none], proto ICMP (1), length 1400) | |
| 172.16.1.3 > 10.4.31.1: ICMP echo reply, id 9135, seq 1, length 1380 | |
| Neutron private network router interface, bridge end of veth pair: | |
| 20:51:39.365189 fa:16:3e:1d:d1:a3 > fa:16:3e:bd:bf:3f, ethertype IPv4 (0x0800), length 1414: (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto ICMP (1), length 1400) | |
| 10.4.31.1 > 172.16.1.3: ICMP echo request, id 9135, seq 1, length 1380 | |
| 20:51:39.366667 fa:16:3e:bd:bf:3f > fa:16:3e:1d:d1:a3, ethertype IPv4 (0x0800), length 1414: (tos 0x0, ttl 64, id 36256, offset 0, flags [none], proto ICMP (1), length 1400) | |
| 172.16.1.3 > 10.4.31.1: ICMP echo reply, id 9135, seq 1, length 1380 | |
| Neutron private network VXLAN interface, controller node end of overlay: | |
| 20:51:39.365710 fa:16:3e:1d:d1:a3 > fa:16:3e:bd:bf:3f, ethertype IPv4 (0x0800), length 1414: (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto ICMP (1), length 1400) | |
| 10.4.31.1 > 172.16.1.3: ICMP echo request, id 9135, seq 1, length 1380 | |
| 20:51:39.366365 fa:16:3e:bd:bf:3f > fa:16:3e:1d:d1:a3, ethertype IPv4 (0x0800), length 1414: (tos 0x0, ttl 64, id 36256, offset 0, flags [none], proto ICMP (1), length 1400) | |
| 172.16.1.3 > 10.4.31.1: ICMP echo reply, id 9135, seq 1, length 1380 | |
| Neutron private network VXLAN interface, compute node end of overlay: | |
| 20:51:39.365710 fa:16:3e:1d:d1:a3 (oui Unknown) > fa:16:3e:bd:bf:3f (oui Unknown), ethertype IPv4 (0x0800), length 1414: (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto ICMP (1), length 1400) | |
| 10.4.31.1 > 172.16.1.3: ICMP echo request, id 9135, seq 1, length 1380 | |
| 20:51:39.366365 fa:16:3e:bd:bf:3f (oui Unknown) > fa:16:3e:1d:d1:a3 (oui Unknown), ethertype IPv4 (0x0800), length 1414: (tos 0x0, ttl 64, id 36256, offset 0, flags [none], proto ICMP (1), length 1400) | |
| 172.16.1.3 > 10.4.31.1: ICMP echo reply, id 9135, seq 1, length 1380 | |
| VM, bridge end of tap interface: | |
| 20:51:39.365816 fa:16:3e:1d:d1:a3 > fa:16:3e:bd:bf:3f, ethertype IPv4 (0x0800), length 1414: (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto ICMP (1), length 1400) | |
| 10.4.31.1 > 172.16.1.3: ICMP echo request, id 9135, seq 1, length 1380 | |
| 20:51:39.366349 fa:16:3e:bd:bf:3f > fa:16:3e:1d:d1:a3, ethertype IPv4 (0x0800), length 1414: (tos 0x0, ttl 64, id 36256, offset 0, flags [none], proto ICMP (1), length 1400) | |
| 172.16.1.3 > 10.4.31.1: ICMP echo reply, id 9135, seq 1, length 1380 |
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