I bought SURFboard s33v3 cable modem in June this year (2025). Initially was able to use port 2.5 GE connecting to Google mesh WIFI router and then from the ethernet port on the Google mesh to the 24-ports switch. All my computers and a few devices access internet with ethernet cables. Everything was working as expected for 2 months. One day suddenly internet dropped, I had to power off and power on the cable modem because port 2.5 GE was constantly flashing in yellow color. I have to switch to port 1 GE, it stays with solid green light. BUT everything slowing down now. The internet connecting through ethernet is very slow, 100MBS and takes long time to switch to a new web page. Any help would be greatly appreciated.
Answer
I cannot connect to Xfinity internet through port 2.5 GE on my newly purchased SURFboard s33v3 cable modem
- The Many
Best answer by SURFboard Moderator
Regarding the 2.5G Ethernet port not establishing a connection, please ensure that only one Ethernet port is used at a time. Connecting both ports simultaneously may cause conflicts and prevent proper network access.
The S33 is a standalone cable modem and does not include a built-in DHCP server. As a result, when your internet service provider (ISP) activates the modem, it typically assigns only one public IP address, which supports a single internet connection.
If you wish to use both Ethernet ports on the S33 simultaneously, you would need to contact your ISP and request the activation of a second public IP address. However, please note that not all ISPs offer multiple public IP addresses for residential customers.
It seems you're experiencing slow internet connectivity.
Could you please let us the speed plan you have subscribed to?
Does the slow speed occur only on the Wi-Fi through the router, or does it also affect the wired connection as well?
This topic has been closed for replies.
- Wi-Fi Warriors
- Answer
Regarding the 2.5G Ethernet port not establishing a connection, please ensure that only one Ethernet port is used at a time. Connecting both ports simultaneously may cause conflicts and prevent proper network access.
The S33 is a standalone cable modem and does not include a built-in DHCP server. As a result, when your internet service provider (ISP) activates the modem, it typically assigns only one public IP address, which supports a single internet connection.
If you wish to use both Ethernet ports on the S33 simultaneously, you would need to contact your ISP and request the activation of a second public IP address. However, please note that not all ISPs offer multiple public IP addresses for residential customers.
It seems you're experiencing slow internet connectivity.
Could you please let us the speed plan you have subscribed to?
Does the slow speed occur only on the Wi-Fi through the router, or does it also affect the wired connection as well?
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