I tested routing performance using our standard router tests, using desktop machines running Windows XP SP2 for both IxChariot endpoints, since both had gigabit Ethernet LAN cards. All tests were done with the LAN client in DMZ, but I had problems getting the LAN to WAN tests to complete. This was probably due to the 600N's use of an SPI+NAT firewall, which usually causes problems with IxChariot test completion. This accounts for the "Abandoned" notation you'll see in the performance plots.
Table 1 shows around 171 Mbps of total simultaneous routing throughput, which places it in the #4 slot in our current Router Performance Charts. The 136 simultaneous connections are a bit disappointing, but the highest for any Linksys router I've tested to date.
|WAN - LAN||
|LAN - WAN||
|Maximum Simultaneous Connections||136|
Table 1: Routing performance
Figure 11 shows throughput variation for simultaneous up and downlink traffic, which is balanced and pretty well-behaved.