Further to PPP to ISP saga - once the PPP connection is up netstat -nr gives (this is copied by hand so excuse formatting) ...
Destination Gateway Genmask Flags MSS Win irtt Iface 195.92.66.87 0.0.0.0 255.255.255.255 UH 1500 0 0 ppp0 127.0.0.0 0.0.0.0 255.0.0.0 U 3584 0 0 lo 0.0.0.0 195.92.66.87 0.0.0.0 UG 1500 0 0 ppp0 195.92.66.87 is the dynamically assigned IP address for the far end of the PPP link. To reiterate the problem I only get ping responses from the IP address at the far end of the connection (in this case 195.92.66.87) . My box is happy to send ping packets to anything else but claims 100% packet loss for returned packets ( despite fact that my modem led seems to indicate incoming packets).