Firewall and VPN throughput: Please help me understand the real world difference ?
I'm working on examining different firewall's to replace an existing Nokia IP 380.
I see different throughput numbers being thrown around by different vendors and it gets rather confusing for me.
Take for example, a FW throughput as advertised at 1 Gbps and VPN throughput as advertised at 600 Mbps.
I only have 1 firewall and about 50 IPSEC VPNs; personally,it doesn't make sense to buy a firewall that can handle such throughput if the line coming into my office is just 1.5 Mbps ?
All VPN's at the site have T1's and the main site has a T1, so what's the point of getting a firewall that encrypts/decrypts traffic at 600 Mbps ?
And VPN throughput is combined into the overall FW throughput ?
I took a look at the device utilization of the firewall between yesterday and today and got this
-- i'm really uncertain how to analyze that and correctly size the new FW ?
On average i believe the current FW is running about 40 Mbps..
I know i'm not understanding something correctly, so please someone please school me...