Apologies, I'm an idiot, typed the tunnel IP address incorrectly in one of the
config files and for some reason couldn't see the problem when I checked it
again for errors.
Please ignore :-)
----- "Simon Detheridge" <[EMAIL PROTECTED]> wrote:
> Hello,
>
> Apologies if this is a FAQ.
>
> My first experiment with vtun isn't working and I'm not sure why. I've
> set up two linux virtual machines for mucking about with. They're on
> the same subnet and can see each other. I'm trying to set up a tunnel
> between the two, just to see how it works.
>
> The tunnel goes up, but when I ping the other end of it I see the ICMP
> request, but there's no repsonse. Syslog shows the connection gets
> established, and ifconfig shows what I should expect for the tun0
> device. If I start 'ping' on one side of the tunnel, and listen with
> tcpdump on the other, I see requests coming in, but no responses going
> out. It doesn't look like the responses are mistakenly going out over
> eth0 either... ?
>
> I get the same results when I try the experiment in either direction.
> (Client pings server, server pings client)
>
> Any suggestions?
>
>
> My configs say:
>
> On the server:
>
> options {
> port 5001;
> syslog daemon;
> }
> default {
> type tun;
> proto udp;
> compress no;
> speed 0;
> keepalive yes;
> }
> v1_v2 {
> passwd foo;
> up {
> ifconfig "%% 10.50.50.1 pointopoint 10.50.50.2 mtu 1450"
> }
>
> The client is the same as above, but says:
> v1_v2 {
> passwd foo;
> up {
> ifconfig "%% 10.50.50.2 pointopoint 10.50.50.1 mtu 1450"
> }
>
>
> ifconfig says (on the client):
> tun0 Link encap:UNSPEC HWaddr
> 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
> -00
> inet addr:10.50.0.2 P-t-P:10.50.50.1 Mask:255.255.255.255
> UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
> RX packets:98 errors:0 dropped:0 overruns:0 frame:0
> TX packets:13 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:500
> RX bytes:8064 (7.8 KB) TX bytes:1092 (1.0 KB)
>
> The server looks the same, but with the IP addresses switched.
>
> If I start:
> tcpdump -i any "net 10.50.50.0/24"
> on the client (10.50.50.2) and ping it from 10.50.50.1, I see the
> following:
>
> 13:04:34.743192 IP 10.50.50.1 > 10.50.50.2: ICMP echo request, id
> 52240, seq 1, length 64
> 13:04:35.743593 IP 10.50.50.1 > 10.50.50.2: ICMP echo request, id
> 52240, seq 2, length 64
> 13:04:36.743390 IP 10.50.50.1 > 10.50.50.2: ICMP echo request, id
> 52240, seq 3, length 64
> 13:04:37.743557 IP 10.50.50.1 > 10.50.50.2: ICMP echo request, id
> 52240, seq 4, length 64
>
>
> Thanks,
> Simon
--
Simon Detheridge - CTO, Widgit Software
26 Queen Street, Cubbington, CV32 7NA - Tel: +44 (0)1926 333680
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