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Re: problems with pppd




Try CIPE instead.  I almost went for that option but what you are
describing sounds typical of what the cipe people warn about.  I've been
using cipe for about a month and love it.  It encapsulates everything in
encrypted udp packets.  My telnet sessions to the other end actually
survive a adsl disconnect/connect.. last night I stepped away for a minute
and didn't even notice :)  (BTW, anyone have any advice about my ADSL
connection dropping?)

To answer your question:
"Why TCP Over TCP Is A Bad Idea"
http://sites.inka.de/sites/bigred/devel/tcp-tcp.html

Their main page:
http://sites.inka.de/sites/bigred/devel/cipe.html
or if you're feeling lucky, type cipe into google..

-Cedar

On Mon, 25 Jun 2001, Oded Arbel wrote:

> Hello list !
> 
> In the company I'm working for we use pppd to form a vpn to a remote
> network. we do this by using the "pty" option of pppd to run it over an
> ssh connection to a remote gateway.
> 
> now the wierdest things : sometimes the link will stop responding
> unexpectadly, but the script that supposed to detect that and restart the
> link doesnot do so ,since the pppd link seems to stay up. today I cought
> it in the act - while pinging to the remote ip (172.31.0.4) goes on
> un-answered, in the logs I see pppd happiliy chirping to itself "lcpecho
> sent, lcpecho recv, lcpecho sent, lcpecho recv..."
> it goes on for a few more mins, and then eventually it will stop getting
> lcpecho responses and drops. but before that I get at least several
> minutes where pppd is sure that the connection is up (and apparently it is
> - since it reports getting echo replys) but no packets travel the line.
> any one has any idea why ?
> 
>  the command used to invoke pppd is like this :
> /usr/sbin/pppd 172.31.0.3:172.31.0.4 silent debug lcp-echo-failure 20
> lcp-echo-interval 1 nodeflate pty "/usr/bin/ssh -t vpn@xxxxxx -i
> /etc/vpn/key.priv" linkname vpn-xxxxxx
> 
> TIA
> 
> Oded
> 
> 
> 
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