Help connecting Netgear router and modem using multi gig

[ModemRouterhelp]

Hi All,

 I'm unable to find any articals on how to setup CM2050v modem to RAX120v2 router to use the multi gig connection. I have Xfinity 1.2 gig and was hoping to use this. I would like to find out what settings i need to use in both and what order do this. The articals i keep finding are using 2 ethernet lines and my modem only has 1 port. Any help would be much appreciated for this novice tech guy.

[plemans]

Page 30 of the manual goes over enabling the multigig connection on the RAX120v2. 

https://www.netgear.com/support/product/rax120v2.aspx

If thats not working, where is it failing in the process? What are you doing and whats going wrong? Details are key to helping 

[ModemRouterhelp]

Thank you for responding. The issue is me not being tech savy. I can follow all instruction. The problem i'm having is on page 32 #3 that says ( 3. Connect Ethernet port 1 and the Internet port on your router to two Ethernet ports
on your modem.) My Modem only has 1 ethernet port to plug into. Did i read too far into this and the second connection is not nessasary ?

[plemans]

you read to far. thats if you're setting it up with wan port aggregation. You're not. You connecting the modem to the 5gig port on the router. 

[ModemRouterhelp]

Yep read too far. I did get all the settings changed and everthing is working except not getting over 1 gig. I have xfiniti 1.2 gig. I'm also using cat8 ehternet cables. I do have a 2.5Gbps Network card. Win 10 - CPU i9 9900K. 32 GB Ram. I will contact Xfiniti and make sure they are sending me the correct speed. Thanks again for all your help. 

[plemans]

Do you get 1.2 connected directly to the modern? The rax only has the one port rated for greater than gigabit speeds