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Trying to diagnose a speed issue. I thought that it could be old lines not capable of 300mbs, but the Xfinity rep said that all lines were capable of 1GB, everywhere. So, I can connect to the internet with my mac connected to my wifi router via ethernet, and the router connected to the modem. When I plug my mac directly to the modem via ethernet to thunderbolt adapter, I can't connect. My mac tells me that my IP address is self assigned. I'm not sure how to fix this. I tried to go into settings and tell it to renew the DHCP lease, but that didn't change anything.
Try power cycling the modem.
Thanks. That worked. My speed was basically the same when I went straight through the router.