Hi all,

I've connected to one of the vpngate's vpnserver successfully, see my
following openvpn client connection info:

------------------------------------------------
$ sudo ifconfig tun1
tun1      Link encap:UNSPEC  HWaddr
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          inet addr:10.211.1.9  P-t-P:10.211.1.10  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:464 errors:0 dropped:0 overruns:0 frame:0
          TX packets:206 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:101188 (98.8 KiB)  TX bytes:17304 (16.8 KiB)
--------------------------------------------------

The vpn server has the address 223.217.208.231, and I connect to it via eth0.

Now I try to do some ping tests wrt this vpn server as follows:

[1]  Ping the vpn server's address via the tun1 interface:

$ ping -c 4 -I tun1 223.217.208.231
PING 223.217.208.231 (223.217.208.231) from 10.211.1.9 tun1: 56(84)
bytes of data.
64 bytes from 223.217.208.231: icmp_seq=1 ttl=254 time=96.1 ms
64 bytes from 223.217.208.231: icmp_seq=2 ttl=254 time=96.2 ms
64 bytes from 223.217.208.231: icmp_seq=3 ttl=254 time=97.7 ms
64 bytes from 223.217.208.231: icmp_seq=4 ttl=254 time=96.6 ms

--- 223.217.208.231 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 96.145/96.708/97.727/0.693 ms

[2] Ping the vpn server's address via the eth0 interface:

$ ping -c 4 -I eth0 223.217.208.231
PING 223.217.208.231 (223.217.208.231) from 192.168.0.2 eth0: 56(84)
bytes of data.

--- 223.217.208.231 ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3018ms

[3] Ping the vpn server's remote tunnel point address via the tun1 interface:

$ ping -c 4 -I tun1 10.211.1.10
PING 10.211.1.10 (10.211.1.10) from 10.211.1.9 tun1: 56(84) bytes of data.

--- 10.211.1.10 ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3022ms

As you can see, only the fist test can be done successfully, while the
other two tests are failed.  Any hints for this issue?

Regards
-- 
Hongyi Zhao <hongyi.z...@gmail.com>
Xinjiang Technical Institute of Physics and Chemistry
Chinese Academy of Sciences
GnuPG DSA: 0xD108493

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