All the Comcast biz setups I've done, they provide you with an "SMC Gateway" which is a combo modem and router. You can configure your own router behind this, bypass the NAT/firewall rules...so that your own router will obtain the WAN IP address. If you have a basic Linksys router...there's really no need to use it instead of the SMC, as the SMC is quite stable and has all the basic feature sets.
The static IP is on the WAN interface.
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