Disclaimer: I am NOT a Cisco expert.
We have recently aquired a company in another state and I have been assigned the task of connecting the 2 locations. We currently have one T1 to the Internet running thru a 1720 router. There is no routing being done except for the default route out. The router has room for 2 WIC's but only one slot is being used. I do have an extra WIC for the empty slot. We are currently using a high percentage of our bandwidth during business hours (~
60%) and have ordered another T1 due to be delivered in about 3 weeks.
How do I best load balance the 2 circuits assuming that we will be using a firewall-to-firewall VPN to connect the 2 locations? Will this router handle the task or do I need different hardware? Would it be better to setup a router-to-router VPN than using the firewall(SonicWall) method? Will there be any changes necessary on the ISP end or will all inbound traffic come in 1 interface?
I have many more questions but will leave it at that for now.
All help is appreciated.