hi. i do have an old small PC with 3 network cards and i got it run debian 7. this PC is my SOHO router.
eth0:192.168.0.79/24 with gateway 192.168.0.1 (DSL router)
eth1:192.168.1.1/24 LAN

at the moment only with the following i get access to the net:
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables -A FORWARD -i eth1 -j ACCEPT
iptables -A FORWARD -i eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT

i have a second DSL connection that i would like to add in eth2 which has the following config:
192.168.2.79/24 with gateway 192.168.2.1 (dsl_router_2)

what config do i have to do so i can have a loadbalance failover. i would appreciate the per session connection, in order not to have problems with sip calls and https sites.

Just now i have found the following http://members.hellug.gr/vyruss/comp...d_balance.html. i have done:
#touch balance.sh
#vi balance.sh and then i pasted the contents of the script, i have change it to my networks
#chmod +x balance.sh


my question is, what do i have to do with that script to make it work, please?

1. Make sure the network cables are plugged into the right ports.
   
2. Be sure the correct values are entered for each variable in the script
   
3. Mark it executable and place it somewhere where it will be ran at each boot.

Then as root run it:

** It should just work assuming this tutorial is the actual solution to your problem. **

It might also help to read the documentation to iptables since it seems like you are sort of just running a script you do not fully understand.

how do i run this at the system boot?

i am trying to do this http://members.hellug.gr/vyruss/comp...d_balance.html to run automatically.

any help available.

You need to create a boot script that runs your script during start up. I forget if Debian 7 uses systemd or sysv-init as the init system. Debian 8 uses systemd. The process is different depending on which init system is in use. I do not have a Debian system currently. Someone else will have to help you.

it is debian 8 that i have upgraded yesterday.
any ideas?

First, you will need to edit your script so that it has "start" and "stop" functionality. Meaning, you should be able to execute this script to turn on your load balancer and to turn off the load balancer.

Second, you will need to do something similar to this discussion to create a service file for systemd that will start and stop your load balancer.

I do not have Debian installed. I do not have systemd installed. I also do not have experience with creating systemd service files. I cannot help you much at this point. Hopefully someone who has the required experience will step in to help you.