VPN Tracker is the leading Mac VPN client and compatible with almost all IPSec VPN gateways (Try VPN Tracker for free). Please refer to the following table to find out if the VPN Tracker team has already successfully tested VPN Tracker with your Linksys (Belkin) VPN gateway. If configuration guides are available for your Linksys (Belkin) VPN gateway, you'll find them here.
In case your Linksys (Belkin) IPSec VPN gateway is not in the list, there's a good chance that your Linksys (Belkin) VPN appliance will still work with VPN Tracker. The VPN Tracker manual has general configuration instructions.
This page lists only Linksys (Belkin) devices sold from 2013 on.
If your Linksys branded device is not in the list, also try the Cisco Small Business / Linksys by Cisco category.