(this works perfectly with a CISCO router having 2 LAN subnets defined on it – when you enter additional default gateway address on a workstation it gets access to the second LAN subnet defined on the router).

Fortinet (and probably others) have firewall type appliances that are able to handle this with ease and even provide some level of load balancing.

I am not good at ISA configuration, but there was a way in this link. You can find “Load balancing between two ISP links option”.

I hope this will help you.

Regards

SiThu

if the router had 2 wan ports there would not have been a problem at all.

ok, so its only through a server-machine with 3 NICs that two ISP’s can distributed into LAN simultaneously.

what about adding some extra routes to the routing table on the workstations (the routes under additional ip to be directed to the 2nd router)???

and to elaborate further on the routing table – all the entrances there have the same value as interface – the default IP address –
is there any way to add an extra interface with different IP address on the same NIC into the routing table?
in other words how is an extra IP address (defined in the network settings next to primary one) handled by the machine and the network (the original idea was: internet down on 1st router – workstations use 2nd IP and 2nd default gateway defined in the net settings to ask for internet from the 2nd router, which is the 2nd default gateway).

by the way, where can i find the correct syntaxis for the “if” option of the “route add” command (what should i enter after if – it will not accept the IP as interface definition).

thanks in advance for all the comments.