Problems pinging PC on tunnel

[Guus Sliepen]

On Fri, Mar 28, 2008 at 02:36:36PM +0200, Viktors Žilinskis wrote:

> If I run the same as a root, I get:
> ### ###
> PING 10.20.40.2 (10.20.40.2): 56 data bytes
> 64 bytes from 10.20.40.2: icmp_seq=0 ttl=128 time=13.039 ms
> 64 bytes from 10.20.40.2: icmp_seq=1 ttl=128 time=148.408 ms
> 64 bytes from 10.20.40.2: icmp_seq=2 ttl=128 time=72.130 ms
> 64 bytes from 10.20.40.2: icmp_seq=3 ttl=128 time=12.023 ms
> 64 bytes from 10.20.40.2: icmp_seq=4 ttl=128 time=101.818 ms
> 36 bytes from 120.Red-83-34-193.dynamicIP.rima-tde.net (83.34.193.120):
> Destination Port Unreachable
> Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst
>  4  5  00 9300 1476   0 0000  30  11 3159 XX.XXX.XXX.XXX  83.34.193.120
> UDP: from port 2885, to port 24052 (decimal)

Perhaps ping, when run as root, intercepts all ICMP packets. It could be
that hosts from rima-tde.net are indeed sending these strange packets to
you, and you end up seeing them when you are running the ping command.
Try using tcpdump on both the VPN and your real Ethernet interface(s)
while you are running ping to see what kind of packets you are
receiving.

-- 
Met vriendelijke groet / with kind regards,
     Guus Sliepen <guus at tinc-vpn.org>
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