[ale] OpenVPN Tun and Routing

[Chris Fowler]

I've made tap work.   I'm now working on tun.  I have an issue where I can
ping the server (192.168.101.1) from the client (192.168.101.6) but I can
not ping the client from the server.  This does not make sense to me.

*Routing entry
192.168.101.2   0.0.0.0         255.255.255.255 UH    0      0        0 tun0
192.168.101.0   192.168.101.2   255.255.255.0   UG    0      0        0 tun0

tun0      Link encap:UNSPEC  HWaddr 
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 
          inet addr:192.168.101.1  P-t-P:192.168.101.2  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:4 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:240 (240.0 b)  TX bytes:408 (408.0 b)

tcpdump
[root at support openvpn]# tcpdump -i tun0
tcpdump: WARNING: arptype 65534 not supported by libpcap - falling back 
to cooked socket
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on tun0, link-type LINUX_SLL (Linux cooked), capture size 96 bytes
11:24:50.905395 IP 192.168.101.6 > 192.168.101.1: ICMP echo request, id 
768, seq 4864, length 40
11:24:50.905473 IP 192.168.101.1 > 192.168.101.6: ICMP echo reply, id 
768, seq 4864, length 40
11:24:52.484665 IP 192.168.101.6 > 192.168.101.1: ICMP echo request, id 
768, seq 5120, length 40
11:24:52.484733 IP 192.168.101.1 > 192.168.101.6: ICMP echo reply, id 
768, seq 5120, length 40
11:24:54.123712 IP 192.168.101.6 > 192.168.101.1: ICMP echo request, id 
768, seq 5376, length 40
11:24:54.123779 IP 192.168.101.1 > 192.168.101.6: ICMP echo reply, id 
768, seq 5376, length 40
*
What am I doing wrong?
I see packet going back and forth between the kernel and the client
via ICMP, but when I on the server and try to ping from there, I get no
reply.



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