Uanble to use mpd5 as a gateway VPN, FreeBSD

[Eugene M. Zheganin]

Hi.

On 30.07.2012 20:14, Bernard Higonnet wrote:
> Hello,
>
> Hope this is the right place to mail...
>
> I have two networks A and B.
>
> One machine on A runs an MPD5 server.
>
> On network B I have machine X which has an MPD5 client used to 
> establish a connection the VPN server on machine Z in network A. Seems 
> to work fine (ping, ssh, etc.). This machine is also set up as a 
> gateway. When I look at the routing table, it looks OK, all references 
> to A being sent to Z.
>
> On network B I also have machine Y. On this machine I have added a 
> route which specifies that network A is to accessed via machine X.
>
> It would appear (sic) that requests from Y to a machine on A are 
> received by that machine. However, nothing ever comes back.
>
> All these machines are running FreeBSD, 8 on Z, and 9.0 on X and Y.
>
> I'm hoping I have forgotten some very obvious thing which a kind soul 
> will point out to me so I don't have to tcpdump everything all over 
> the place...
>
So.... Z is an mpd, X is a client, Y is a machine behind a client. X 
sees Z, Y doesn't see Z because Z isn't answering, however, Z sees 
incoming packets.
My guess - Z doesn't know where is the B network, as when X is 
exchanging packets with Z, it does it by using it's p2p-address.

Try to see the output of 'route -n get <B network ip address>' on Z.
If I'm right - add a route, via bundle matching or via up-script, or 
manually, or use nat on X.

Eugene.