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 From:  Lee Sharp <leesharp at hal dash pc dot org>
 To:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] Dropped Traffic on IPSec VPN after switching ISPs
 Date:  Tue, 12 Apr 2011 17:01:19 -0400
On 04/12/2011 04:46 PM, Jim Spaloss wrote:

> That said, I have m0n0wall deployed at quite a few locations, many of which
> have been have been working reliably with IPSec tunnels for several years.
> This location that I'm dealing with the issue in was trouble-free for
> several years over IPSec, right until until we switched from DSL to cable.

> This issue may very well be unrelated to M0n0wall or IPSec, and I probably
> will pursue it with the ISP. The only reason why I haven't so far, is that
> the same ping command that loses 50% traffic over the tunnel, doesn't drop
> any when going out to an external web site like Google, and I've have no
> freeze-ups, or disconnects when connecting to the site via PPTP. That's what
> has me stumped.

I have had some bizarre problems with MTU.  The worst was a website that 
would only partially load till I dropped it.  I am about to start 
setting it to 1400 as a regular practice.