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Tue, May 18, 2021 5:27 AM

Static IPs and dropped packets multiple time per day...

Are there known issues with Comcast static IPs randomly having responses not routed back from blocks of time?

For the past several weeks I've had issues where I lose internet connectivity 4 to 10 times per day. These outages last anywhere for 6 to 35+ minutes at a time. I added a network tap to port mirror packets on my switch between the Comcast gateway and my firewall to feed continuous packet capture and analysis software. Every time it goes down I can see packets being transmitted on the gateway switch port, but get only a handful of received packets for the length of the outage. When I check concast status it says there are no issues and the "status" from the gateway also shows no issues. During the outages the only traffic that seems to go through from my static IPs is ICMP, but anything else ends up in a black hole. Any of the (worthless) diag tools from the gateway get responses, but nothing from my equipment. For instance a DNS lookup from the gateway resolves, but from a host with a static IP (outside my firewall) the same DNS request (to the same servers) times out dozens of times in a row. Maybe 10 minutes later and those same queries resolve in milliseconds with no changes on my equipment.

I've had these statics for nearly a decade and only started having issues the past 3 or 4 months. I've called tech support 3 times and they replaced the gateway and had me restart the gateway several times, but always tell me it looks fine now so they'll close the ticket. Fine if it happened a couple times, but it is literally an hour plus every day.

For reference I'm a lead performance and reliability engineer with 25+ years of systems and network experience. Everything up to the CPE is working fine on my network, but I can't diagnose what happens after it hits Comcast equipment and I'm sick of calling tech support for them to tell me to restart the gateway. If it's a known issue I just want to know so I can ditch Comcast and go to a provider that can actually fix problems and consider on going reliability issues as something that needs to be resolved and not trying to get me off the phone as soon as possible.

No Responses!