forwarding features

Tim McGarry tim at
Wed Nov 20 08:39:05 EST 2002

This is what agent-forwarding does, it could be handy if it was available
for other uses too


----- Original Message -----
From: "Jon Peatfield" <J.S.Peatfield at>
To: <openssh-unix-dev at>
Sent: Tuesday, November 19, 2002 6:37 PM
Subject: forwarding features

> While messing with various tunnels it occured to me that there may be
> cases where some extra tunneling functionality would come in handy.  I
> thought I better run it past the list before trying to implement a
> patch since the last 2 times I did this there was another way to
> get the effect I wanted with no code changes...
>   Forwarding should not just be of AF_INET but (where available)
>   AF_UNIX (ie forwarding unix-domain sockets).  The syntax might be a
>   little messy though.
>   The ability to set up forwardings at any point, e.g. ssh to a host
>   which runs some code to determine which ports need forwarding and it
>   asks the sshd to negotiate with the client, or a user might want to
>   add a new forwarded connection by typing some ~ stuff from the
>   client end...
> The reason I've been thinking about this is that I need to be able to
> set up a -R tunnel, but I don't know the port to listen on since
> someone else may already be using that port (well I can select the
> port at random, but that isn't safe either -- perhaps port 0 should
> ask sshd to select any free port).  If I could port-forward
> unix-domain sockets then the name could be guarenteed unique,
> similarly if the forwarding could be added after running code we would
> be ok too.
> [ Well I could do it with external code at both ends I suppose, but
> that just makes it harder to run on some platforms ... ]
> --
> Jon Peatfield,  DAMTP,  Computer Officer,   University of Cambridge
> Telephone: +44 1223  3 37852    Mail: J.S.Peatfield at
> _______________________________________________
> openssh-unix-dev at mailing list

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