How to choose MTU size for Beeline KZ L2TP connection?

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nihi1ist2020-04-23 10:52:42

Mikrotik

nihi1ist, 2020-04-23 10:52:42

The connection worked for a month and a half, and at some point the connection stopped rising. Is there a way to determine the MTU size?

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2 answer(s)

K

Keffer, 2020-04-23
@Keffer

You don't need to do this. There the standard MTU for L2TP is 1460.

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Alexander Karabanov, 2020-04-26
@karabanov

The MTU is determined as follows, ping with the target xsot in the parameters of the ping utility, specify the packet size and disable fragmentation, then reduce the packet size until the target host starts to respond, the resulting packet size plus 28 bytes is the desired MTU
Example for Linux ping 8.8.8.8 -M do -s 1472 target host responds, so MTU 1472+28=1500
But since L2TP is used, MLPPP can be used more details https://youtu.be/VP2q82tXZh4?t=4279 and presentation bit.ly/2HoOXN6