[pptp-server] pptp and ADSL

[Justin Kreger]

ADSL lines are not the best of technology.  I mean, if you have a good
high quality phone line, with no water, or anything in the line, it will
be just fine, but when there is water in the line, or if the line is
downright a Piece of $hit, the adsl connection may be dropped for a few
minutes at a time.  I have an ipsec tunnel running between two places with
DSL.  The place with the newer phone line has more problems, goes down so
often that I four emails per hour saying that it had to reconnect the
ipsec tunnel.  DSL is good, but only if your phone line is good.

Justin Kreger, MCP MCSE CCNA
jkreger at earthling.2y.net jwkreger at uncg.edu jkreger at aristotle.wss.net


On Tue, 22 May 2001, Joe Ward wrote:

> pptp and ADSLI used to get this error all the time with my cable modem.
> I set the following in my options.pptp file and that removed almost all
> instances of the problem
> 
> mtu 750
> mru 750
> 
> Also running the latest version of poptop will alllow for packet reordering.
> this will further improve the problems.
> 
> -Joe Ward
> 
> 
>    -----Original Message-----
>   From: pptp-server-admin at lists.schulte.org
> [mailto:pptp-server-admin at lists.schulte.org]On Behalf Of Scott Stone
>   Sent: Tuesday, May 22, 2001 1:40 PM
>   To: 'Krebs Peter'; pptp-server at lists.schulte.org
>   Subject: RE: [pptp-server] pptp and ADSL
> 
> 
>   sounds like this isn't a case of them blocking the VPN ports so much as it
> is a case of a poor quality ISP that doesn't want to be bothered with
> concepts that are over their heads :)  if you're getting the connection
> established at all, they're not blocking VPN traffic, at least not any that
> you need...
> 
>   -----------------------------------------------------
>   Scott M. Stone <sstone at taos.com>
>   Senior Technical Consultant - UNIX and Networking
>   Taos, the Sysadmin Company - Santa Clara, CA
> 
>     -----Original Message-----
>     From: Krebs Peter [mailto:pkrebs at lvu.at]
>     Sent: Tuesday, May 22, 2001 10:06 AM
>     To: pptp-server at lists.schulte.org
>     Subject: [pptp-server] pptp and ADSL
> 
> 
>     Hi,
> 
>     has any one experiences with pptp and ADSL?
> 
>     We use linux pptp and your client uses win2k with a ADSL connection to
> his ISP.
> 
>     It seams to work but sometimes i get an error:
> 
>     GRE: Discarding out of order packet
> 
>     As we use the tunnel to connect to a AS/400 i get trubles if connection
> between AS/400 and
>     client dies for a (short) time (1 to 2 sec). With M$ products like
> Outlook connection to a Exchange
>     Server the tunnel works fine.
> 
>     Can the reason for this be that ADSL uses tunneling.
>     The ADSL provider just say we do not support VPN.
> 
> 
> 
>