[arin-ppml] An article of interest to the community....

[Jimmy Hess]

On Tue, Aug 30, 2011 at 8:31 PM, Mike Burns <mike at nationwideinc.com> wrote:
> Hi Paul,
> 80 is not the only port.
> Remember port 21's problem with port 20?
> That screwed up Nat right from the getgo, but how long did it take for
> passive ftp to appear?

Bad example.  Years;  nearly 20 years after the introduction of the
FTP protocol,
and packet filters preceded it by years as well,  it  was solving a
problem that had been around
for quite a while.

RFC 1579  "Firewall friendly" passive mode FTP was introduced to cope
with  inbound packet filters.

And...  RFC1918 did not exist in 1994, there was no such thing as a
private IP address.
NAT had nothing to do with this.

http://www.ietf.org/rfc/rfc1579.txt


--
-JH