SSH tunnel 127.0.0.2 to supermicro IPMI system

map_remote_ipmi_ports_to_loopback_ip.sh

#!/bin/bash
set -x

#
# Purpose:  Run on a workstation to make a remote IPMI controller available at http://127.0.0.2:80/
#           Only does port mapping.  IPMI controllers may have their own taxing browser requirements.

# Requires that you have a shell on a host that is on the same network as your IPMI interface.
shell='user@ssh-host-on-ipmi-network'

# IPMI controller's IP address (on networks attached to your ssh host).
ipmihost='192.168.1.16'

# An additional address which we will later add as an alias on the loopback interface.
# This allows you to pretend that 127.0.0.2 is the address of your IPMI controller.
ifalias='127.0.0.2'

# The host I used this script with only required the following ports, for the features I was using.  Yours may require more.
ports="80 443 623 5900 5901 5120 5123 8889"

# 
# Forward each known IPMI port to the specified IPMI host-address using
# SSH TCP Forwarding as described in http://manpages.ubuntu.com/manpages/zesty/en/man1/ssh.1.html#contenttoc5
# Build the SSH forwarding args, adding a -L [bind_address:]port:host:hostport argument for each port.
#
for p in $ports; do
    fwportspec=" ${fwportspec} -L $ifalias:$p:$ipmihost:$p "
done

#
# Add an extra IP address that SSH will bind to for listening to the local forwarding ports.
#
sudo ifconfig lo0 alias $ifalias

#
# Open the ssh connection to the host that is on the same network as your IPMI interface.
# Puts SSH in verbose mode and enables compression for some reason.  This does the port forwarding over ssh channels.
#

# As long as your shell to the remote host is open, you can browse to http://127.0.0.2:80 and access the IPMI login page.
echo "Using shell $shell to map IPMI-related ports on host $ipmihost to 127.0.0.2. http://127.0.0.2:80/"
sudo ssh -v -C $fwportspec $shell

sleep 1   # I don't remember why this is here.
sudo ifconfig lo0 -alias $ifalias  # Remove the extra IP from the loopback interface.