On 16Feb2020 13:44, Patrick Dupre <pdupre@xxxxxxx> wrote:
I also tried:
ssh -f -L 5901:localhost.fr:5901 euripide sleep 10
bind [127.0.0.1]:5901: Address already in use
channel_setup_fwd_listener_tcpip: cannot listen to port: 5901
Could not request local forwarding.
Just to this part:
For things to which I connect regularly I allocate extra 127.0.0.n
addresses to my local interface. This lets you bind to a specific
address without conflict. Here's part of my local machine's ifconfig:
% ifconfig -a
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
options=3<RXCSUM,TXCSUM>
inet6 ::1 prefixlen 128
inet 127.0.0.1 netmask 0xff000000
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
inet 127.0.0.31 netmask 0xff000000
inet 127.0.0.25 netmask 0xff000000
inet 127.0.0.23 netmask 0xff000000
inet 127.0.0.2 netmask 0xff000000
inet 127.0.0.3 netmask 0xff000000
... etc ...
I also make entries in /etc/hosts:
127.0.0.28 solar.l
... etc ...
which lets you do things like this:
ssh -f -L solar.l:5900:localhost.fr:5900 euripide sleep 10
i.e. bind the local port to a distinct 127.0.0.n address allocated for
that ssh tunnel target. I've got over 30 such addresses and names on my
personal machine, to support several tunnels.
Our home server does similar (on a lesser scale) and has this line in
/etc/rc.local:
addif -i lo 127.0.0.2..9
Note the "2..9" indicating I want 127.0.0.2 through 127.0.0.9. You can
get addif here:
https://bitbucket.org/cameron_simpson/css/src/tip/bin/addif
It is just a script to make the right "ifconfig" calls to add addresses,
with the right OS-specific variants.
With this I have ssh clauses with preprepared port forward
configurations using these. For example, my standard tunnel to the home
server has (amongst other forwards):
Host homeserver
LocalForward homeserver.l:5905 localhost:5905
LocalForward solar.l:5900 solar:5900
which forwards to the server's local vnc:5 desktop and also to the VNC
on the solar monitoring box (which is on the home LAN).
Cheers,
Cameron Simpson <cs@xxxxxxxxxx>
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