British Telecom Retail Tests IP Address Sharing
, the 'IPv4 adress shortage' department:
BT Retail has begun testing a controversial technology called Carrier-Grade Network Address Translation (CGNAT), which will see some BT Retail customers sharing IP addresses, following a similar pilot scheme begun by BT-owned ISP PlusNet earlier this year.
The technology is being piloted with BT’s Option 1 Total Broadband customers, who BT says use the Internet the least.
You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump