If it's not clear.....I want to carry a mother truckin 1500 byte packet
from the end user to the internet. I have full control of the path
between the pppoe client and server, so I didn't anticipate this being a
problem, but somehow it's a problem.
On 8/13/2019 12:04 AM, Adam Moffett wrote:
So I've never done much with PPPoE.
In my test setup I have a Mikrotik PPPoE Server set with "Max MTU" of
9216. This is a CCR with an actual max of 10,000+ bytes.
The PPPoE client is a Ubiquiti ER-X-SFP. The Ubiquiti client will not
allow me to set an MTU on the PPPoE interface higher than 1500. They
physical interface has an MTU of 2016 (maximum for this platform).
The active session on the mikrotik server reports "Actual MTU" of
1480, and fragments packets larger than that. Packets larger than 1492
are silently dropped.
There's a switch between the tik server and ubnt client, and it has
jumbo frames enabled and has an MTU of 9216.
So I'm 100% confused.
If the MTU on the client is 1500, where are the limits of 1480 and/or
1492 coming from?
Why in the ever loving hell does the Ubiquiti router not allow an MTU
higher than 1500 on the PPPoE client?
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