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Re: [Openvpn-users] UDP Tunneling?


  • Subject: Re: [Openvpn-users] UDP Tunneling?
  • From: R P Herrold <herrold@xxxxxxxxxxxx>
  • Date: Mon, 10 Nov 2003 13:32:06 -0500 (EST)

On Mon, 10 Nov 2003, Leo Vetterli wrote:

> Does anybody know if openvpn supports UDP Tunneling? I mean that the UDP
> Protocol on a Sub-LAN is tunneled with Openvpn to the LAN?

udp will route through the openvpn tunnel just fine:

Here is ICMP and UDP demonstrated through two openvpn links 
(hops 1 and 2) [I have a nameserver 53/udp at 10.30.0.254]:

[herrold@localhost herrold]$ traceroute -n 10.30.0.254
traceroute to 10.30.0.254 (10.30.0.254), 30 hops max, 38 byte 
packets
 1  10.255.251.2  77.960 ms  66.203 ms  76.749 ms
 2  10.254.10.1  72.592 ms  71.207 ms  72.613 ms
 3  10.10.10.36  72.359 ms  71.929 ms  72.609 ms
 4  10.30.254.2  74.943 ms  76.598 ms  75.899 ms
 5  10.30.0.254  81.672 ms  93.047 ms  96.622 ms
[herrold@localhost herrold]$ sudo nmap -n -sU -p 53 10.30.0.254

Starting nmap V. 3.00 ( www.insecure.org/nmap/ )
Interesting ports on  (10.30.0.254):
Port       State       Service
53/udp     open        domain

Nmap run completed -- 1 IP address (1 host up) scanned in 1 
second

-- Russ Herrold

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