More likely, your ISP is using Port Address Translation (Masquerading in 
Linux-speak), and so you probably share a single registered IP address with 
many other users, so precluding incoming connections from the outset - no 
filtering or packet sniffing required on the ISPs part.

Graham....

At 04:55 17/10/2000, you wrote:
>On Mon, 16 Oct 2000, Ward William E PHDN wrote:
>
> > IOW, could you arrange that the only way the ISP would be able to
> > detect the service was to either use a packet sniffer, or to go
> > outside the native IPs of the ISP and sniff from outside the ISP?
>
>Yes, but:
>
>what if the ISP does the equivalent of...
>
>  ipchains -A input -d $DSL/24 80 -j DENY
>
>at their border routers?
>
>--
>  John Hardin KA7OHZ   ICQ#15735746   http://www.wolfenet.com/~jhardin/
>  [EMAIL PROTECTED]      pgpk -a finger://gonzo.wolfenet.com/jhardin
>   768: 0x41EA94F5 - A3 0C 5B C2 EF 0D 2C E5  E9 BF C8 33 A7 A9 CE 76



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