from this article：
http://backreference.org/2010/03/26/tuntap-interface-tutorial/
the author created a tun interface
# openvpn --mktun --dev tun2
# ip link set tun2 up
# ip addr add 10.0.0.1/24 dev tun2
then he did a ICMP ping to 10.0.0.2
# ping 10.0.0.2
PING 10.0.0.2 (10.0.0.2) 56(84) bytes of data.
From 10.0.0.1 icmp_seq=2 Destination Host Unreachable
From 10.0.0.1 icmp_seq=3 Destination Host Unreachable
...
and he used tshark or tcpdump to capture packets on interface tun2, and he
can capture packets as below:
0.000000 10.0.0.1 -> 10.0.0.2 ICMP Echo (ping) request
0.999374 10.0.0.1 -> 10.0.0.2 ICMP Echo (ping) request
1.999055 10.0.0.1 -> 10.0.0.2 ICMP Echo (ping) request
I followed the same procedures, but I can't capture packets like he did,
and I don't get `Destination Host Unreachable`. I think the problem is due
to local routing, in his test, it seems that the system regard `10.0.0.1`
as the default gateway for subnet 10.0.0.0/24, but in my test, it is not
the case.
so how can I get the same result as the author's?
BTW, on my machine:
tun2 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-
00-00-00-00-00-00
inet addr:10.0.0.1 P-t-P:10.0.0.1 Mask:255.255.255.0
UP POINTOPOINT NOARP MULTICAST MTU:1500 Metric:1
RX packets:7 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:420 (420.0 b) TX bytes:0 (0.0 b)
route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0
wlan0
10.0.0.0 0.0.0.0 255.255.255.0 U 0 0 0
tun2
192.168.1.0 0.0.0.0 255.255.255.0 U 2 0 0
wlan0
I don't understand what is the meaning of `0.0.0.0` for gateway, so I did
add a route:
route add -net 10.0.0.0 netmask 255.255.255.0 gw 10.0.0.1
and get
Destination Gateway Genmask Flags Metric Ref
Use Iface
0.0.0.0 192.168.1.1 0.0.0.0 UG 0
0 0 wlan0
10.0.0.0 10.0.0.1 255.255.255.0 UG 0
0 0 tun2
10.0.0.0 0.0.0.0 255.255.255.0 U 0
0 0 tun2
192.168.1.0 0.0.0.0 255.255.255.0 U 2
0 0 wlan0
still it doesn't work. I really don't understand why.
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