On 11/08/12 16:37, Jason White wrote:
James Harper <james.harper@bendigoit.com.au> wrote:
On 11/08/2012 12:48 AM, Trent W. Buck wrote: Correct, PPPoA supports an MTU of 1500, but PPPoE has 8 more bytes of overhead, reducing this to 1492.
There are lots of placebo anecdotes to argue the merits of either one.
And some ISP's blindly use an MTU of 1492 (or lower) anyway.
I'm with Internode and using a Traverse Technologies Solos card with PPPoA.
AOL
I had to reduce my MTU to 1496 bytes. Packets above 1496 never reached the destination - if I remember rightly, they didn't reach the gateway either. I don't know why, however.
Blame their access network[1]. They really should not allow a PPP session to negotiate 1500 bytes but apparently some CPE fails if you limit MTU, they work around this in v4, but as I've pointed out to a few of their network people before they don't in v6 which makes things like YouTube suck for v6 enabled customers. Forcing link MTU is actually the right thing to do here. 1: For background see my LCA2012 sysadmin talk: http://www.youtube.com/watch?v=TYxPLEmbCuk