Date: Wed, 6 Oct 1999 23:23:49 -0600 (MDT) From: "Aaron D. Gifford" <agifford@infowest.com> To: questions@freebsd.org Subject: ppp across ssh (vpn) Message-ID: <19991007052349.57D6D20FB8@infowest.com>
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Hello, I was playing around trying to establish a VPN connection by using userland ppp across SSH. I believe I have everything set up the way the ppp.conf.sample and man page described. It almost works. I can watch the log files on both sides of the tunnel. The client works as expected. However, on the server side, I keep getting "tun0: Phase: Exception detected on descriptor 0" and looking at the PPP code, it would seem that ssh is for some reason sending out-of-band data (since the select() man page explains that the only reason for an exception on a file descriptor is for OOB data). Looking at my ppp.startvpn.sh script: #!/bin/sh exec ssh -a -c blowfish -e none -l sshvpnuser -q -x vpn.server.host /usr/sbin/ppp -direct vpnserver When I add a "-t" to force ssh to allocate a pty and run the script by hand from the command line, sure enough, I see: # ./ppp.startvpn.sh ~ÿ}#À!}!}!} $}(}"}'}"}"}&} } } } }!}$}%Ü}%}&&á›ß}$}(À%} } <and other PPP-looking stuff> BUT when I do NOT allocate a pty OR I run the script via PPP on my client machine, nothing happens and I see the exception previously mentioned on the server side. I am assuming that there is some terminal-related traffic, perhaps, that SSH is doing with OOB data that's causing the exception, but is maybe handled when there's a pty allocated? Please, I'm grasping at straws here, playing with stuff I know nothing about. Any ideas? Suggestions? Thanks! Aaron out. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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