On linux I can do that easly via gnome-network-applets.
Code:
$ ifconfig ppp0
ppp0 Link encap:Point-to-Point Protocol
inet addr:10.1.1.242 P-t-P:16.16.1.1 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1
RX packets:5973 errors:0 dropped:0 overruns:0 frame:0
TX packets:5846 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:5780677 (5.5 MiB) TX bytes:786531 (768.0 KiB)
I am still not able to connect over OpenBSD.