I have a Motorola SB6121 cablemodem connected to a custom PFsense router.
The issue is when the internet is being somewhat spotty, occasionally it might disconnect for 5-10 seconds.
What usually happens is the modem has a T4 timeout and reboots itself. After that, if the internet is still down it will assign a 192.168.100.x IP to the WAN port of my router instead of a public IP.
The problem then is that the internet will come back up, but there is a delay before it starts working again because the WAN port of my router still has a 192.168.100.x private IP address. I can either log into the router and force it to renew it's DHCP lease or wait an additional few minutes for it to occur automatically.
This is extremely annoying because the disconnects themselves are often very short, often so short that I don't even get disconnected from online games. But once the modem assigns the router a private IP, the internet will be down for minutes at least. I'm not sure why it even needs to assign the 192.168.100.x addresses, as the modem diagnostic page at 192.168.100.1 is always accessible even when the router is assigned a public IP.
I have a dynamic ISP IP address, but it stayed the same for years. I tried entering the info manually as a static IP in my router and the results were great. Since the router was never being assigned a private IP, the internet would always come back up instantly once the disconnection was over. Unfortunately after a few days my internet stopped working, and after switching back to DHCP again it came back but it had a different IP. Apparently because I wasn't constantly refreshing my DHCP lease anymore, the IP was dropped, so I can't set it as static for more than a few days at most.
Any ideas?
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