Merging two internet bandwidths and load sharing

I have a large network with over 1600 pcs divided into 5 IP subnets, which are connected to a core switch. The subnets are,,, and and the core switch is the one doing all the routing between this subnets and its ip is

Now I have two internet bandwidths coming in. One is over RF and is 1Mbps RAW and another one is 512 Kbps through VSAT. Both of them have different IP Pools. The Bandwidth-One has ip pool of and the bandwidth-Two has ip pool of

Now I want to merge this bandwidth in such a way that the total BW avlb. to the users is 1.5Mbps and whenever one of them is down the load is switched to other one automatically.

I have 2 PCs with redhat linux 9 and squid installed on it. Both of them have 2 NICs one connected to internal VLAN and other having live IP.

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rarrrConnect With a Mentor Commented:
I've looked into this quite a bit since at work with have two 512kbs lines coming into one redhat box.

I'd suggest putting both internet connections into on box and then either using something like netsplitter ( or try something like

Failing that search on google for load balancing.

just my 2p worth
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