"Virgin home internet is now on CGNAT. Are Bell customers next?" (not my subject heading)

[Liptonbrisk]

Ugggggggh. I hate CGNAT.

https://forum.virginplus.ca/t5/internet ... true#M1484

https://www.reddit.com/r/bell/comments/ ... _are_bell/


Related thread
viewtopic.php?p=82837#p82837


I keep thinking contracts from ISPs are potentially enticing if contracts guarantee no price hikes during the contract period, but there's really nothing stopping any ISP from implementing CGNAT (Carrier-Grade NAT) while you're on that contract. As far as I know, Rogers and Bell have price hikes (for residential home internet service) coming in March 2026 for a lot of customers.

Telus has also introduced CGNAT for some residential internet customers. Trying to be removed from CG-NAT with Telus doesn't seem fun, overall: https://forum.telus.com/discussions/my_ ... nat/167677. Others might get lucky: https://forum.telus.com/discussions/my_ ... ble/177503.

telMAX also rolled out CGNAT to some users: https://forum.netgate.com/topic/199775/ ... nat-needed.

Rogers Xfinity uses CGNAT when the Rogers gateway (or modem/router combo) is not in bridge mode.

Why is CGNAT relevant? Well, Rogers 5G Wireless Home internet, which also uses CGNAT, does not work with Freephoneline or Fongo Home Phone. I know Freephonline uses a 60 minute registration period (making fast port assignment changes to all your neighbours sharing your IPv4 address a problem); I suspect Fongo Home Phone uses a 60 minute registration period well (but I'm not positive). Freephoneline's SIP proxies don't use IPv6. Presumably Fongo Home Phone's don't either. voip4.freephoneline.ca:6060 is the same as sip2.fongo.com:6060, which Fongo Home Phone can use. I can't find AAAA records for sip2.fongo.com (as an example).

[Liptonbrisk]

I've been informed that Freephoneline and Fongo Home Phone now support TCP transport, which allows SIP clients to remain connected with both services through CGNAT. TCP transport being offered to Freephoneline customers is a significant change, in my opinion. Only use TCP when there's no other choice, please. That is, please only use TCP when dealing with CGNAT issues. Thank you.