[AusNOG] TPG EFM - low MTU

[Ryan Crouch]

Hey Bruce,



Easy fix for this one. Land your AGVC/VPDN interconnects inside separate
VRF's split by product/carrier?



I know TPG use internet routable LAC's and that can be used to your
advantage, but to avoid these exact kinds of issues, VRF's are your friend!



- Ryan





*From:* AusNOG [mailto:ausnog-bounces at lists.ausnog.net] *On Behalf Of *Bruce
Forster
*Sent:* Monday, 23 June 2014 3:53 PM
*To:* McDonald Richards; ausnog at ausnog.net
*Subject:* Re: [AusNOG] TPG EFM - low MTU



Hi Noggers,

Ahh i found my issue.... Cheers for the help! feel silly posting should of
seen this!

For those playing at home i seem to be picking up the route for the lac via
another peer and i found a low mtu in the path!



On Mon, Jun 23, 2014 at 3:26 PM, McDonald Richards <
McDonald.Richards at vocus.com.au> wrote:

You need to be able to hit a LAC at 1540 bytes from your LNS if you don't
want to be fragmenting clients. Add another 8 bytes for PPPOE…



Macca





*From: *Bruce Forster <bruce at tubes.net.au>
*Date: *Monday, 23 June 2014 3:20 PM
*To: *"ausnog at ausnog.net" <ausnog at ausnog.net>
*Subject: *[AusNOG] TPG EFM - low MTU



Hi Noggers,

I have a strange issue seems to be isolated to VIC LAC's

Some session are coming up at MTU 1476.

I did managed to clear a l2tp tun and the session came back via another LAC
at 1500.

These are the ones i have had problems with: TPGVICLAC-6e / TPGVICLAC-5e

To get around it iv set mtu on the dialer to match and used a mss-adjust...



I can ping to the LAC's IP at 1500 with no issue.


-- 
Regards,

Bruce




-- 
Regards,

Bruce
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