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Re: [Openvpn-users] Openvpn and rendezvous


  • Subject: Re: [Openvpn-users] Openvpn and rendezvous
  • From: Hans-Peter Mani <hp@xxxxxxxxxx>
  • Date: Sun, 07 Jan 2007 23:02:38 +0100


Les Mikesell wrote:
> On Fri, 2007-01-05 at 20:42 +0100, Hans-Peter Mani wrote:
>
>   
>> I am trying to get discovery service like apple's rendezvous working 
>> with openvpn tunnels. From what I googled I understand that i have to 
>> use a multicast router like mrouted. I am far away from being an expert 
>> but I tried to create a mrouted tunnel with something like this
>>
>> ifconfig:
>>
>> tun0  Link encap:UNSPEC  HWaddr 
>> 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 
>>           inet addr:10.5.5.1  P-t-P:10.5.5.2  Mask:255.255.255.255
>>           UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
>>           RX packets:10051 errors:0 dropped:0 overruns:0 frame:0
>>           TX packets:60457 errors:0 dropped:0 overruns:0 carrier:0
>>           collisions:0 txqueuelen:100
>>           RX bytes:1956681 (1.8 MiB)  TX bytes:82776222 (78.9 MiB)
>>
>> /etc/mrouted.conf:
>>
>> tunnel 10.5.5.1 10.5.5.2 metric 1 threshold 32
>>
>>
>> However, mrouted terminates immediately and reports
>>
>> warning - ignoring tun0, has invalid address (10.5.5.1) and/or mask 
>> (255.255.255.255)
>>
>> After some googling it seems mrouted does not work with mask 
>> 255.255.255.255.
>>
>> Can anyone confirm that this is the right way (using mrouted) to get 
>> rendezvous working ?
>> Can anyone help and can post a complete example ?
>>     
>
> Assuming you aren't using the .0 and .3 addresses, you could
> ifconfig the interface to use a netmask of 255.255.255.252
> which might work if it wants to see a traditional 4-host subnet
> for the route instead of a p-t-p link.
>
>   
How does that look like ? Do you change the netmask by using

ifconfig tun0 netmask 255.255.255.252

Do you have to change the routing table ?

> I haven't used mrouted, but have run multicast over openvpn using
> the static router smcroute.  If you know the multicast group
> and potential senders ahead of time you can set up static
> routes to forward them.
>   
How does that look like ?

hp

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