On Sun, Aug 17, 2003 at 06:31:38AM +0800, John Summerfield wrote: | On Sat, 16 Aug 2003, Phil Howard wrote: | | > I'm running Linux/390 (2.4.17) under Hercules (2.17.1) under Linux (2.4.21) | > on x86, and noticed that the encapsulation between host and guest systems | > for the CTC via TUN interface is different: | > | > On the host side: | > | > tun0 Link encap:Point-to-Point Protocol | > inet addr:192.168.10.1 P-t-P:192.168.10.2 Mask:255.255.255.255 | > UP POINTOPOINT RUNNING MTU:1500 Metric:1 | > RX packets:45 errors:0 dropped:0 overruns:0 frame:0 | > TX packets:55 errors:0 dropped:0 overruns:0 carrier:0 | > collisions:0 txqueuelen:10 | > RX bytes:6067 (5.9 Kb) TX bytes:5780 (5.6 Kb) | > | > On the guest side (note the P-t-P address, too): | > | > ctc0 Link encap:Serial Line IP | > inet addr:192.168.10.2 P-t-P:192.168.10.2 Mask:255.255.255.252 | > UP POINTOPOINT RUNNING NOARP MTU:1500 Metric:1 | > RX packets:49 errors:0 dropped:0 overruns:0 frame:0 | > TX packets:40 errors:0 dropped:0 overruns:0 carrier:0 | > collisions:0 txqueuelen:100 | > RX bytes:5460 (5.3 KiB) TX bytes:5471 (5.3 KiB) | > | > How is that supposed to work? | | With those IP addresses, does it?
Yes, it is working fine. The ifconfig output was obtained via an ssh session to the Linux/390 system running under Hercules right then. | I IPLed my system to take a look and for once tun0 didn't come up | cleanly so I had to configure it cleanly. | | Now I have different encapsulation _and_ different multicast and | different MTU. I'm thinking the PPP code might have a default capability that if it does not receive any negotiations, it falls back to a "raw" IP tranfer mode, which is basically SLIP. -- ----------------------------------------------------------------------------- | Phil Howard KA9WGN | http://linuxhomepage.com/ http://ham.org/ | | (first name) at ipal.net | http://phil.ipal.org/ http://ka9wgn.ham.org/ | -----------------------------------------------------------------------------
