We have 2 FWSMs [versions: FWSM1: 2.3(4) & FWSM2: 2.3(3)] in C6509 chassis [with IOS version 12.2(18)SXF4]
We have 10Gbps link towards ISP and we would like to use full bandwidth with the 2 FWSMs.
FWSM1 is the main firewall have one inside and one ISP interface and both interface have one IP address.
FWSM1 firewalled our network thus far but we run out of IP addresses :(
We have to use the FWSM2 to NAT [translate roughly 1500 IPs/clients] but we have only one IP address towards ISP.
Can we configure the 2 FWSMs side-by-side in C6509 chassis to provide 10Gbps, and stay one IP address towards ISP?
Or we should ask more IP from ISP?
ISP's gw IP (etc.): 10.0.0.213 metric 1 (default gw)
Should it work? If won't, how to configure the C6509 & FWSMs to works side-by-side?