[Format_C]

I don't know if I should put this in general or this page so feel free to move if needed anyway
As the title states I can't access my model status page of 192.168.100.1

This is somewhat of a new issue and is not really a problem per say but I can't check my signal or power levels anymore.

I tried using the modem directly as well and I still can't access the page so I suspect this is an ISP issue?

My modem is a Arris TM1602A and the ISP in question is Charter/Spectrum the modem does not have any configuration that I can change just status pages showing various thing such as firmware and power & signal levels as well as the total uptime and MTA (Media Terminal Adapter AKA the Phone modem portion)

Also do I correctly configure IPv6 for Charter/Spectrum

PS: I'm on the newest posted DD-WRT version posted on 10/13/2022 and this problem existed before this and this was just to see if it was a router issue but it seems the ISP changed the access or possibly blocked it?

Thanks

[blkt]

Unfortunately it is very likely your ISP pushed out a security patch or firmware update to the cable modem.
Only other possibility is if for some reason modem status pages are http, not https, check browser settings.
https://www.dslreports.com/forum/r32165651-Can-t-get-into-Arris-TM1602A-status-pages-recently
https://www.dslreports.com/forum/r33435825-OOL-Firmware-update-for-Arris-TM1602A
Try power cycling the modem. <shrug>

[Format_C]

Oh well not a biggie but now on to my second question then,

which is how do I correctly configure IPv6 for Charter/Spectrum?

[Per Yngve Berg]

Is your modem in bridge mode, i.e you have the public IP on your dd-wrt router's WAN?

IPv6 shall be set to get a PD with length 48-64

Your ISP probably uses 58, 60 or 64.

64=One sub-net. No room for guest network.
60=16 sub-nets
58=64 sub-nets.