nanog mailing list archives

Re: MTU to CDN's


From: valdis.kletnieks () vt edu
Date: Tue, 09 Jan 2018 01:23:41 -0500

On Mon, 08 Jan 2018 17:55:55 -0500, Dovid Bender said:
Hi,

N00b here trying to understand why certain CDN's such as Cloudfare have
issues where my MTU is low. For instance if I am using pptp and the MTU is
at 1300 it wont work. If I increase to 1478 it may or may not work.

Wait, what?  MTU 1300 fails but 1478 sometimes works?  Or was 1300 a typo
and you meant 1500?

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