On Mon, 7 Jan 2002 17:40:47 +0800 "glynn" <glynn@itextron.com> wrote: > when you configure that tunneling did you reconfigure your kernel? what > should i enable in my kernel? by the way when i log-on to the linux A, I > could ping the linux B eth0(internet) and eth1(let say "192.168.1.1") > but when i ping the "192.168.1.2" which is a windows workstation > connected to hub it wont pass thru. how do i sniff the interface where > the packets go, can you help me about that pls. Thanks So you can ping from 192.168.2.1 to 192.168.1.1, this is good, as it means that the tunnel definitively is working. Now, if you try to ping from 192.168.2.1 to 192.168.1.2, the Windows box, it seems to fail. First I would try to ping from 192.168.1.1 to 192.168.1.2, just to make sure, everything is working fine locally. If this works too, I would make tcpdump listen at the external interface of 192.168.2.1. Does the packet actually go out? If not, the routing or filter problem must be there. If it works, I'd listen on the external interface of 192.168.1.1; obviously these must arrive because the tunnel is working and the packet left at the other side. Now you can listen to the internal interface, seeing if the packet is actually being forwarded. If this fails, your problem is routing, filtering or forwarding on 192.168.1.1. Don't know how to sniff on a Windows, but as the ping from 192.168.1.1 to 192.168.1.2 presumibly worked, there shouldn't be a need. If you have access and there is no other traffic, a much simpler method would be just to watch the leds on the modems, network cards, hubs, etc. This will help finding out where your problem is. As you can ping the first computer after the tunnel, I feel sure, the tunnel is working fine, the problem must be in another place, probably a stupid little detail. Note that the suggestion of introducing a different network address for the tunnel interfaces themselves will slightly complicate routing. But if you pay attention, this shouldn't be a problem. -- Christoph Simon ciccio@kiosknet.com.br --- ^X^C q quit :q ^C end x exit ZZ ^D ? help .
