Hi, On Wed, Apr 22, 2015 at 12:48:28PM -0700, Fred Templin wrote: > When I connect my device to my ISP, I am assigned > a default route that points to an ISP router. But,when > I connect using a VPN client like OpenVPN, won't > OpenVPN also try to set up a default route for me that > points to the VPN gateway?
That depends on the VPN provider (we only push specific routes to our
employees, "split tunnel VPN").
> If so, how does the networking stack know which default
> route to use, i.e., the one that goes to the ISP router via
> the access network or the one that goes to the VPN
> gateway via the VPN? Or, is there some other magic
> at work here?
OpenVPN will figure out how to reach the VPN server, install a host route
for that using the old default router, and then install a new default
route towards the VPN (either by replacing and restoring /0, or by adding
two /1 routes).
And this does not work for IPv6 yet, because nobody has written the
"find out what my default gateway is right now, so I can add more specific
routes to it!" code yet...
gert
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