The MAC shown on your Roku screen is the MAC of the Roku device itself. The modem has its own MAC.
Your problem in connecting to the network may have been caused by an update to your router which affects some Roku models. The update in question changes the router's wifi connection parameters from b/g/n to g/n. This has been reported lately with equipment from Comcast/Xfinity and Cox, but there may be others.
Affected users report the Roku identifies the local network as available and rates the connection quality, but will not then connect. The fix is to switch the router configuration protocols from the g/n wifi that was set by the update back to b/g/n. If you don't have access to your router's configuration controls you may have to have your internet provider do it for you.
Step-by-step post from @AvsGunnar for Comcast/Xfinity users: https://community.roku.com/t5/Network-Wireless-Wired-Connections/Error-014-30-stuck-for-three-days/m...
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I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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