[TriLUG] need help in port forwarding
jonc at nc.rr.com
Thu Jan 15 11:58:39 EST 2004
On Thu, 2004-01-15 at 11:17, Magnus Hedemark wrote:
> On 15 Jan 2004, Jon Carnes wrote:
> > > ssh -l payal -L 1080:127.0.0.1:3128 <ip>
> > Why are you using ssh to do local port forwarding (127.0.0.1) - or was
> > that just an example?
> That's not local port forwarding; that's forwaring port 3128 of "<ip>" to
> localhost port 1080. The 127.0.0.1 in there is not from the context of
> the ssh client but from the ssh server specified at the end of the command
> In other words, the machine he's ssh'ing to is the same machine that also
> listens on port 3128 that he would like to forward to his own localhost's
> port 1080.
Hmmm, here are the man page entries for ssh:
Specifies that the given port on the local (client) host is to be
forwarded to the given host and port on the remote side. This
works by allocating a socket to listen to port on the local side,
and whenever a connection is made to this port, the connection is
forwarded over the secure channel, and a connection is made to
host port hostport from the remote machine. Port forwardings can
also be specified in the configuration file. Only root can for-
ward privileged ports. IPv6 addresses can be specified with an
alternative syntax: port/host/hostport
BTW: I've done this for a couple of clients, and it works a charm.
Note that only root can port forward ports below 1024.
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