Here are just a few of the snags that I've run into while using this
system. I put them here so that you can hopefully avoid them. If you
run into any new ones, please
email them to me so that I can keep track, and help others avoid
them.
This error is associated with mis-matched
versions off pppd. If you get it, try upgrading both ends of the
connection to the latest version of pppd. I've found that pppd version
2.2 has this problem, so use version 2.3.7 or 2.3.8 instead.
This error is generated by route. I've seen it happen when the
sleep time between ssh and ppd is not long enough. If
you get this error, run ifconfig, and you may see that there is no
pppX interface. This means that ssh was not done
authenticating before pppd was launched, and therefore
pppd did not make the connection. just increase the delay, and
your problems will be solved.
I wonder however if there might be some pppd option that will fix this
problem.
In the new 2.2 kernel, you must specifically enable IP forwarding in the
kernel at boot up. This with the following command:
# echo 1 > /proc/sys/net/ipv4/ip_forward
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Without this, the kernel will not forward any packets, and hence the
server will not work, nor will any of the gatewaying clients.
It should go without saying, but be careful when you are routing real numbers
that you don't route traffic destined for the VPN server's external address
through the tunnel. It won't make it. (yes, this is from personal
experience.)
