GRE 47 pass-through and VPN connection reliability

JCB · Guest

Is there any way to ensure reliable establishment of a PPTP VPN connection
when (apparently) some I'net routers do not permit GRE packet passthrough? I
have been unable to remote into my home office reliably - I frequently
receive a "Verifying Username and Password..." message but do not connect .
Once I do get in, I look at the System log on the RRAS box - it detected the
connection attempts but warned that the problem was likely due to I'net
blockage of GRE packets. I suspect I am successful, once the routers
redefine the best path to my Public IP, but this is a somewhat random process
via RIP or OSPF (i.e., the luck of the draw).

I know people who use 3rd party VPN connectivity software and never seem to
have connectivity problems. If there is some RRAS configuration setting I
have overlooked that would eliminate or mitigate this very frustrating
problem, please enlighten me.

regards,
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JCB\1059