Maybe I'm misreading this but...

Fri Oct 16 21:39:11 UTC 1998

In article <199810161909.PAA16027 at merit.edu>,
I Am Not An Isp <patrick at ianai.net> wrote:
> At 01:12 PM 10/16/98 -0400, tvo wrote:
> >Doesn't this break MTU path discovery though?
> 
> No, it wouldn't.  Those addresses are not routable on the global 'Net,
> however, there is nothing stopping a device with an RFC1918 address from
> sending a packet onto the 'Net.

Except that many people filter out RFC 1918 at ingress, in the same
ACL that blocks spoofing of your own blocks.

(although if you see it in a traceroute you know that's not happening)
-- 
Shields, CrossLink.