Re: VPN & PPPoE

["Rob Davis" <RobWadeD () hotmail com>]

Hi Paul,

I worked for a VPN company in the past.  Check the MTU size.  I think the
packet may not be making it thru both the IPSec encapsulation and the PPPoe
encapsulation.  The max MTU size is 1524.  IPSec adds overhead to the IP
packet (new header and extra data) and then PPPoe adds even more.  It works
fine for small packets (ping and etc), but when you get to larger packets
they get dropped.

----- Original Message -----
From: "Paul Gaskin" <paul () midwesttechnologies com>
To: <security-basics () securityfocus com>
Sent: Friday, January 17, 2003 3:29 PM
Subject: VPN & PPPoE


> I am new to the list and I'm not sure if this even falls into this
category
> but I'm getting desperate!
>
> We have set up a VPN and it seems to work fine everyone can log on and
move
> around the network and send and receive email.
>
> One person though... on a DSL using PPPoE can not send e-mail. we have
tried
> everything... has anyone run into this problem?
>
> the user is on a Windows XP laptop connected to a Linksys wireless router
> (Using PPPoE). and Outlook for E-mail.
>
> Any help would be greatly appreciated
>
> Thanks in advance
>
> Paul