Thanks Tim! I'll try 1400 and see if that provides for a more stable tunnel.

Dylan

On Jun 6, 2011, at 7:39 PM, Tim Payne wrote:

> I had to set my MTU's to 1400...  Still a little flakey..  Good Luck..
> 
> -tp
> On Jun 6, 2011, at 8:36 AM, Dylan Bouterse wrote:
> 
>> I have an IPSEC tunnel that has been giving us fits since we switch from a 
>> Pix to a RB750. There is location A that is at the main office with a RB750 
>> (on a fiber upstream) and the remote site on a RB750 using PPPOE over DSL. 
>> Both 750s are on 5.4 after upgrading due to various fixes. The tunnel will 
>> stay up for days, then drop, and neither an installed-sa flush nor reboot 
>> will bring the tunnel back up. The MTU on the pppoe client is set to 1440 
>> and mru at 1480. I believe there are issues with IPSEC over PPPOE with MTU 
>> set too high? Any ideas? If I need to provide more information, please let 
>> me know.
>> 
>> Dylan
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