We have one service provider that we use the full T1 on a regular basis. We would like to go with another service provider to double our bandwidth and load balance the 2 internet connections. We contacted a consultant, and he keeps pushing the Radware Linkproof device (http://www.radware.com/content/products/lp/default.asp)
We currently have a Cisco2811 series router unused. Could this achieve our desired function?
Also, how difficult would this be to do?
There are several ways to accomplish this.
1. If you use 2 separate providers you will want to have your own IP space to simplify things, unless the IP space you have the provider will allow you to route that space through their network. Other wise you will need your own. The best scenario for this is to run BGP with both providers. In order to do this you will need your own ASN since you will be multi-homed. Now traffic will never balance, no one can ever guarentee that, but it will share traffic. Based on many different route selections in the BGP rules, you can do a search for BGP route selection if you want to know them all. Once you get this you can then begin to do some traffic shaping if it is not giving you exactly what you want, but with BGP you have that ability since you advertise the routing, your peers just send it to their peers.
2. Another way is to have another link from the same provider from the same POP, then run equal weight static routes, this will give you more of a 50/50 split, but again not always.
3. You can used different providers and different IP space and route outbound traffic out one line and all inbound traffic in the other.
4. You can subnet your block's. If you own a /24 route the lower half of the /25 block out one connection and the higher /25 out the other connection then have a metric on the opposite block when routing in case one link goes down the other will pickup the load for all traffic.
Bottom line it comes down to requirement.