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Created January 18, 2016 02:50
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MTU experiments - capture of ping with 1373 payload and DF=1 after moving MTU mismatch
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gistfile1.txt
# ping -c 1 -s 1373 -M do 10.4.31.102
PING 10.4.31.102 (10.4.31.102) 1373(1401) bytes of data.
From 10.4.31.102 icmp_seq=1 Frag needed and DF set (mtu = 1400)
--- 10.4.31.102 ping statistics ---
1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms
Neutron public network router interface (gateway):
20:53:46.626324 7e:27:12:8e:ab:89 > fa:16:3e:1b:0d:d3, ethertype IPv4 (0x0800), length 1415: (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP (1), length 1401)
10.4.31.1 > 10.4.31.102: ICMP echo request, id 9414, seq 1, length 1381
20:53:46.626387 fa:16:3e:1b:0d:d3 > 7e:27:12:8e:ab:89, ethertype IPv4 (0x0800), length 590: (tos 0xc0, ttl 64, id 9338, offset 0, flags [none], proto ICMP (1), length 576)
10.4.31.102 > 10.4.31.1: ICMP 10.4.31.102 unreachable - need to frag (mtu 1400), length 556
(tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP (1), length 1401)
10.4.31.1 > 10.4.31.102: ICMP echo request, id 9414, seq 1, length 1381
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