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SSTP accepts client MTU up to 16384 bytes
Closed, ResolvedPublicFEATURE REQUEST


[email protected]# set service sstp-server network-settings mtu 44

  Number 44 is not in the range 128-16384

  Invalid value
  Value validation failed
  Set failed

As this is a point to point link which runs over an IP network I do not know if a MTU up to 16k makes sense at all. I would expect a maximum MTU of 1500bytes minus the overhead of SSTP?

Please correct me if I'm wrong.


Difficulty level
Easy (less than an hour)
Why the issue appeared?
Will be filled on close
Is it a breaking change?
Behavior change
Issue type
Improvement (missing useful functionality)

Event Timeline

c-po triaged this task as Normal priority.
c-po created this task.
c-po changed Difficulty level from Unknown (require assessment) to Easy (less than an hour).
c-po changed Version from - to 1.3-rolling-202001311637.
c-po changed Is it a breaking change? from Unspecified (possibly destroys the router) to Behavior change.
c-po changed the task status from Open to In progress.Mar 20 2020, 3:34 PM
c-po claimed this task.
c-po added a subscriber: Dmitry.

As the mtu on an ip network could exceed 1500b it is not so strange to allow larger than 1500b frames on the tunnel. But this could be adjusted to follow the max mtu values on ethernet interfaces. As taken from my head max mtu on ethernet is about 9000b

erkin set Issue type to Bug (incorrect behavior).Aug 31 2021, 5:47 PM
erkin changed Issue type from Bug (incorrect behavior) to Improvement (missing useful functionality).