[pptp-server] Problems with PPTP on Digital Unix 4.0d

Terry Stillone terrys at maths.uwa.edu.au
Fri Feb 16 01:34:54 CST 2001


PPTP compiled fine on our Digital UNIX Alpha but won't run successfully [using a Windows client]. We tested the same source and configuration on a Redhat Linux system and that operated fine.

Details of Alpha setup:

OS:            Digital Unix 4.0d
PPP:          Version 2.3.11
PPTP:        Version 1.01
Network:    Switched 10baseT - no firewalls
Compiler:   GCC 2.7.2.3

Has anyone got PPTP to run on a Digital Unix system ?

After analysing the results of tcpdump scans and placing debug in the pptpcrtl code it appears that the problem is with the GRE socket [gre_fd]. The socket can send GRE packets out but the select system call is not recognising that there are packets available to read on the gre socket.

Tcpdump scanning on the Alpha showed that it was observing GRE packets from the client but the select call on the GRE raw socket was not acknowledging that they were available to be read.

Many Thanks,
Terry

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