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 From:  "Chris Buechler" <cbuechler at gmail dot com>
 Cc:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] Strange IPSec VPN problem -- Telnet get hang at the same place everytime!
 Date:  Fri, 23 Jun 2006 16:39:50 -0400
On 6/23/06, m0n0 <mono at gmitec dot com> wrote:
> My company use a text based ERP. We use telnet or SSH to connect the remote
> site server usually. But since telnet is so insecure through net so I tried
> to set an IPSec VPN between two offices. I found that if I use
> monowall-monowall IPSec or monowall-Sonicwall IPSec VPN, the user will get
> hang up at the EXACT SAME SCREEN POSITION (character) when telnet login ERP
> and enter a function.

Path MTU discovery doesn't work properly over IPsec VPN's in m0n0wall.
 Try dropping your client system's MTU to 1400 and see if that fixes
it.  It almost certainly will.