[rescue] Public IP addresses [Was: rescue Digest, Vol 226, Issue 38]

[Mike Meredith]

On Fri, 1 Oct 2021 15:08:45 -0400, Nemo Nusquam wrote:
> Sorry that I missed this comment earlier but my wife worked at a very 
> large university that had so many IPv4 addresses that all staff had 
> public IP addresses.

Well of course, and not necessarily so big. The really big ones got
/8's and I've only got a /16 to play with. They're really supposed to
be "globally unique addresses" rather than "public IP addresses" - it's
exceptionally likely that those IPv4 addresses are "public" without
behind behind a firewall.

If you want to be flamed to a crisp and beyond, mention that NAT is the
perfect solution to anyone who's dealt with multiple layers of NATting.
I've only dealt with up to three layers but I know people who've dealt
with situations with up to seven layers of NATting.  

-- 
Mike Meredith (http://zonky.org/)
  No security outfit ever went broke relying on the stupidity of users.