[AusNOG] GRE Tunnel MTU suggestions

[Roland Dobbins]

On Jul 1, 2014, at 6:13 PM, Mateusz Viste <nogs at border6.com> wrote:

> A "safe" value would be 1400 bytes for your MSS rewriting, but you might be able to get a little bit higher if not using the whole range of features in your GRE headers and/or if you're sure that hosts on both networks use no TCP extensions (but you probably never can be really sure about that).


1400 is indeed quite common; also, 1470 and 1476 are often used.

----------------------------------------------------------------------
Roland Dobbins <rdobbins at arbor.net> // <http://www.arbornetworks.com>

                   Equo ne credite, Teucri.

    		   	  -- Laocoön