What is "the meaning" of this `ip route`?
Solution 1:
That's one of a pair of routes that certain VPN software sets when you tell it to redirect all of your traffic through the VPN.
The other route is:
0.0.0.0/1 via 10.144.1.8 dev ppp0 ...
The reason for setting these routes, of course, is so that (almost) all of your traffic goes through the VPN link. It is done this way so as not to override the default route, which has to be left alone in order to carry the VPN traffic itself.