If anyone from Mediacom responds, please do not ask me to contact Business Support. I spent most of the day Friday on the phone with them, and it took half of that time just to get them to send me the gateway setting. They have already told me they've provided everything they have.
I had my firewall / router configured for dynamic IPv6 from Mediacom for quite a while, but my /64 prefix delegation on my LAN kept changing. I was already paying for a static /30 IPv4 address, so I asked Business Support for a static IPv6 address. Eventually they sent this that I've obfuscated a little:
said by "Commercial Total Care" :IPv6 scope 2604:2e80:XXXX::/48
Gateway 2604:2e80:XXXX::1
Start Range: 2604:2e80:XXXX:0:0:0:0:0
End Range: 2604:2e80:XXXX:ffff:ffff:ffff:ffff:ffff
No. of host: 1,208,925,819,614,629,174,706,176
My firewall has two interfaces: WAN and LAN. So far the only IPv6 configuration that works for my firewall is putting the entire /48 on the WAN side. I have to set the default gateway on the WAN and pick a static address from the scope for my firewall's WAN interface. This doesn't provide any IPv6 connectivity on the LAN interface though. I have not been able to determine how I can split the /48 into subnets, so I can get my LAN connected.
When I read about IPv6 from other ISPs, they mention either using the first /64 subnet for the WAN, or using prefix delegation to split the /48 into subnets. Business Support can't say which of these they support, and neither option worked when I tested them.
My best guess is that the /48 is directly attached to the head-end, and this configuration effectively prevents splitting the /48 into subnets. Basically they expect all of the 1,208,925,819,614,629,174,706,176 addresses to be bridged to the head-end.
I've already tried several configurations that should work or might work. Does anyone know how Mediacom Business customers can split a static IPv6 /48 into subnets?
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