Hi there. I am trying to set up a IPIP tunnel between two Linux 2.0.3[56]
machines, but have hit a brick wall. For testing purposes, I have the two
machines connected via ppp. I have followed the directions in section 6.8
of the NET-3 HOWTO. These directions seem to be rather different that those
in the drivers/net directory of the kernel source, but I couldn't follow the
kernel source directions as clearly.
When I try to ping the other side of the tunnel, all the packets are
dropped. The modem lights don't even blink indicating outgoing packets.
Since I can't even get encapsulated packets out of one box, I'll just show
the setup of one side for brevity.
In brief, the boxes are connected over ppp from 192.16.4.1 (A) to 192.16.4.2
(B). I can ping over this link just fine. Computer "A" (the one shown
below) is 192.168.3.128 on network 192.16.3.0/24 while machine "B" is
172.16.3.111 on 172.16.3.0/24.
Any ideas what I am doing wrong? If I can provide any addition information
to help track this down, let me know.
TIA,
Ken
Script started on Fri Nov 20 13:20:52 1998
[root@A ppp]# ifconfig -a
lo Link encap:Local Loopback
inet addr:127.0.0.1 Bcast:127.255.255.255 Mask:255.0.0.0
UP BROADCAST LOOPBACK RUNNING MTU:3584 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0
eth0 Link encap:Ethernet HWaddr 00:00:F8:70:C0:39
inet addr:192.168.3.128 Bcast:192.168.3.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:514357 errors:0 dropped:0 overruns:0 frame:0
TX packets:2628 errors:0 dropped:0 overruns:0 carrier:0
collisions:60
Interrupt:11 Base address:0xec00
ppp0 Link encap:Point-to-Point Protocol
inet addr:192.168.4.1 P-t-P:192.168.4.2 Mask:255.255.255.0
UP POINTOPOINT RUNNING MTU:1500 Metric:1
RX packets:49 errors:0 dropped:0 overruns:0 frame:0
TX packets:67 errors:0 dropped:0 overruns:0 carrier:0
collisions:0
Memory:1fb8038-1fb8c04
tunl0 Link encap:IPIP Tunnel HWaddr
inet addr:192.168.3.128 Mask:255.255.255.0
UP RUNNING NOARP MTU:1480 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
collisions:0
[root@A ppp]# netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt
Iface
192.168.4.2 0.0.0.0 255.255.255.255 UH 1500 0 0
ppp0
192.168.3.0 0.0.0.0 255.255.255.0 U 1500 0 0
eth0
172.16.3.0 192.168.4.2 255.255.255.0 UG 1480 0 0
tunl0
127.0.0.0 0.0.0.0 255.0.0.0 U 3584 0 0 lo
0.0.0.0 192.168.4.2 0.0.0.0 UG 1500 0 0
ppp0
[root@A ppp]# ping 172.16.3.111
PING 172.16.3.111 (172.16.3.111): 56 data bytes
--- 172.16.3.111 ping statistics ---
5 packets transmitted, 0 packets received, 100% packet loss
[root@A ppp]# exit
Script done on Fri Nov 20 13:21:23 1998
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