BBC News - 'Fresh proposals' planned over cyber-monitoring

Andrew Cormack Andrew.Cormack at
Fri May 10 13:49:57 BST 2013

> -----Original Message-----
> From: ukcrypto-bounces at [mailto:ukcrypto-
> bounces at] On Behalf Of Roland Perry
> Sent: 10 May 2013 11:42
> To: ukcrypto at
> Subject: Re: BBC News - 'Fresh proposals' planned over cyber-monitoring
> In article <518CB006.8000604 at>, Peter Tomlinson
> <pwt at> writes
> >The internet service provider (ISP) has announced that it is currently
> >piloting technology called Carrier-Grade Network Address Translation
> >(CGNAT) that will see as many as nine different customers share the
> >same IP address.
> Mobile networks use carrier-grade NAT as well, so the technique is well
> understood.

And the static mappings between port ranges and customers might arguably be covered by the current Data Retention Regs? And anyway represent only a similar volume of logs to current DHCP. That might explain the "may not need legislation" comment?

As opposed to some of the v6 variants, and traditional, non-CG, NAT, where you might have to log a lot more dynamic mappings from address/port to user; potentially as many as one for every TCP connection. Lots more logs, lots more hardware, and synchronised times even more critical :(


> >BT said it is trialling CGNAT in a bid to make the most efficient use
> >of existing "IPv4 internet address", which are currently "running
> out",
> >before new "IPv6 addresses become widely adopted". Doing so will
> enable
> >fixed-line internet customers to stay connected, it said.
> God forbid they roll out IPv6 instead :(
> --
> Roland Perry

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