Network Routing Issue

@XfinityEricB​ Your answer indicates that you are most certainly not a network support agent. A Tier 2 network support agent would have simply requested my location, then accessed my router to run a tracerout to an endpoint at my location, determined why I'm only getting 4 Kb/s throughput, and resolved the problem. There is nothing wrong with my LAN. Xfinity speed test returns 900 Mbps download speed (but fails to report upload speed). Any issue that reduces my throughput so drastically simply has to be in the WAN, not my gateway. As has happened in the past, there is absolutely nothing an Xfinity technician can accomplish in my home to resolve this issue. If I reboot my gateway multiple times, it would probably eventually trigger the address change I'm asking for but without the intelligent guidance of a knowledgeable network technician to avoid pulling from the same IP address block. Please escalate this to Tier 2 network support as I requested.

user_etl198 My colleague is correct that for your own security this is beyond our level of access to release and renew the IP address. That does need to be done in your home, and you can find the directions we provide on how to do so here. The best option would be, if you have someone who has access to your home while you are out of the country, is to have them go to your home and follow the steps that are detailed in that link. This is not something anyone will have access to do remotely, including our Tier 2 support. 

Sorry,  but you and your colleague are both wrong. The procedure you cited is to release and renew the IP address my Xfinity gateway assigns to a PC on my Local Area Network, not the DHCP address the Xfinity ISP assigns to my Xfinity gateway Wide Area Network (WAN) port. Please escalate this request to qualified Tier 2/3 Network support:

Subject: Request for WAN IP Reassignment Due to Mis‑Routed IP Block (76.135.59.x)

Hello Xfinity Support,

I need assistance with a routing issue tied to my current WAN IP assignment.

My modem has been assigned the WAN IP 76.135.59.x, and this IP block is being mis-routed through a distant region. As a result, I am experiencing extremely high latency and unusable upstream performance.

Symptoms
- Latency to my own server: 176–181 ms
- Throughput: 4 KB/s
- No packet loss
- Local LAN performance: normal
- Gateway speed test: 900 Mbps

Technical Summary:
The latency profile is consistent with long‑haul or international mis-routing. 

This behavior is consistent with:
- Mis‑advertised BGP routing  
- Incorrect geolocation of the assigned IP block  
- Assignment to a foreign or overflow transit path  
- A CMTS assigning an IP from a mis‑routed pool  

This is not a local equipment issue.

Please release my DHCP lease and assign a new IPv4 address from a different routing pool.  
If needed, please escalate to a network engineer. A new IP assignment from a properly routed block should resolve this issue immediately.

Thank you for your help.