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Point to Point Tunneling Protocol
Authored by: denty on Sep 09, '03 06:42:23PM

An alternative to altering the way pppd works is to set up the local routing table so that more specific routes already exist to the places you want to go on your LAN/intranet.

For example, if your local intranet uses the network (as many do), if 10.x.y.z is the address of your local network router, then saying:

sudo route add 10.x.y.z

will make your local intranet immune from the defaultroute problem.

In this scenario, all intranet traffic will go via en0, as before, while internet traffic will go by whatever PPP/PPTP says.

If you really want almost all traffic to go via en0 (with only those very specific tunelled networks going by the PPP link), you can say:

sudo route add 10.x.y.z
sudo route add 10.x.y.z

This has almost the same effect as blocking out PPP/PPTP's defaultroute (which is equivalent to because both and are more specific (the number after the slash is bigger). Together, these two routes cover the whole of the internet.

If you get into a mess with routing, 'netstat -nr', 'route get' and 'route delete' are your friends.


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