Temporary load-balance fix (VPN and L2TP) to add connected routes

There are way too many posts about issues with VPN and L2TP with load-balance config on 1.9.0 firmware.

The issue is being tracked by UBNT (see beta forum # 6 HERE) and hopefully we'll see permanent fix soon.

Temporary workaround is to add connected routes via /usr/sbin/ubnt-add-connected.pl script. This needs to be executed periodically.

Here's a little cron to do it every 5 minutes with minimal load on a system.

1) Create script /config/scripts/fix-add-connected.sh with content

#!/bin/bash/sbin/ip route show table 201 | /bin/grep -q "127.0.0.0/8" || /usr/sbin/ubnt-add-connected.pl
# add any logging you may want here

If you're using non-default LB routing tables change 201 for one of your custom routing LB tables.

Make sure the script is executable by chmod 755 /config/scripts/fix-add-connected.sh

2) Create task scheduler to execute it every 5 minutes

    task-scheduler {
        task ADD_CONNECTED {
            executable {
                path /config/scripts/fix-add-connected.sh
            }
            interval 5m
        }
    }

... same as configuration commands

set system task-scheduler task ADD_CONNECTED executable path /config/scripts/fix-add-connected.sh
set system task-scheduler task ADD_CONNECTED interval 5m