Hi,
The "-s" option provides the length of the ICMP data in the packet, not
the total packet length.
To the data size you need to add 8 bytes for the ICMP header and 20
bytes for the IP header.
So, you are sending 1328 bytes (which is noted between the brackets in
your output).
If you change to "-s 1292" then you are actually sending packets with
total length of 1320.
Kind regards,
Frank
Op 2-4-2022 om 19:41 schreef lejeczek:
Hi guys
I thought there was no better place to ask but here so - both ends are
centOS and end up having different MTUs for 'wg' interfaces and that I
thought, was wrong.
1370 (server) VS 1320 (client)
I expected that would be negotiated between nodes without user
involved, right?
Moreover if I from the client do:
-> $ ping server -M do -s 1300
PING 10.3.3.1 (10.3.3.1) 1300(1328) bytes of data.
ping: local error: message too long, mtu=1320
Could some expert or two shed more light on what & why is happening?
many thanks, L.
