I will explain scenario in 2 steps :
1. Current Setup :
We have T1 line coming from datacenter to our office connected to serial port of 2621 router. Fastethernet0/0(FE0) is connected to 2900 Catalyst switch.
Firewall Pix 515E (OS version 8.0) is also going to this 2900 catayst switch. Theere is one cisco vpn connected to this 2900 Catalyst switch too.
Firewall has 6 Ethernet ports, 3 in use(1 to outside from catalyst, 2nd to lan switch, 3rd to Failover PIX)
The T1 line coming from datacenter also provides Public ip addresses which we are using to have VPN, 1-2 servers directly reachable from internet.
2. Proposed Setup :
We want to add one more internet connection through an ISP which will provide it through modem.
Something like below :
So my question is can I accommodate this new internet connection in my current setup without disturbing VPN, Internet, private network access to Datacenter ? Also, I want it to be load balanced Connection instead of Backup ISP connection.
I read http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a00806e880b.shtml which says how to setup 2nd Internet connection as backup Internet but I want it to be load balanced.
Please help me here.