Cannot get static ip block to work with external router

Hello, I have a block of 5 static ips and I'm trying to use an external router (RV340W), however I cannot get the static ips to route. I put the comcast router into bridge mode (Advanced). If I set the wan of the router to dhcp, it gets an external dynamic ip, all clients can get out to the internet, but none of the 1 to 1 NAT rules work for the ips in the block. If I set the wan to the static ip information that I see on the My account page I do not get internet access at all.

Here is what comcast account shows

Static IPv6 Information2603:3023:a25:XXXX::/XX
Static IP Range96.78.XXX.XXX - 96.78.XXX.XXX
CIDR Block Number96.78.XXX.XXX/29
Gateway IP Address96.78.XXX.XXX
Subnet Mask IP Address255.255.255.248

Cisco router wants

Static IP (I'm assuming this is the first address of the CIDR block)
Subnet: (255.255.255.248)
Default Gateway: Using the one provided
DNS: providing standard comcast dns 75.75.75.75, 75.75.76.76

Responses

Comcast_Ray

Official Employee

•

32 Messages

4 years ago

Hello, @Mindcloud. Thank you for reaching out about the connection issues happening when involving the router. You may find this link useful to get things working, https://comca.st/2SWgdM5. If you need further assistance past the steps in the link please feel free to send us a chat message with your first and last name and the service address.

Here are the detailed steps to direct message us:
• Click "Sign In" if necessary
• Click the "Peer to peer chat" icon (upper right corner of this page)
• Click the "New message" (pencil and paper) icon
• Type "Xfinity Support" in the to line and select "Xfinity Support" from the drop-down list
• Type your message in the text area near the bottom of the window
• Press Enter to send your message

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