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From Gary Turner <>
Subject Re: [users@httpd] apache server 2.0.43
Date Fri, 10 Jan 2003 19:53:48 GMT
David Jones wrote:

>my isp say they are filtering port 80 and i have 3 computers 2 of them are
>on a router
>and the other one  on a diffrent connection but all on the same ISP
>2 cable modems
>one for the 2 cpu's on the router
>and one by its self
>i can go to my other computer on the other side of the room and pull it up
>by typing this
>and only this ---->
>but not able to with this--->
>can someone help here
>could it be that all 3 computers are networked together via broadband cable
>line within my house

internet-->ISP firewall-|->ISP LAN-->you

you-->ext DNS(internet)-->ISP firewall-|->ISP LAN-->you

Request from outside is blocked.

you-->ISP LAN-->another you

Nothing is blocked within the LAN.

This is just a guess.  Just as you can address any machine on your LAN
without going through your own firewall/router, the same thing is true
of on the larger LAN run by the ISP.

On the other hand, is dynamic DNS service, right?  The request
must exit the ISPs LAN, go through the internet DNS process and re-enter
through the ISPs firewall, where port 80 addresses are blocked (or maybe
any address from within the LAN).

Consider this to be a very non-technical analogy.  It also does not
consider your own firewall rules.
 If someone tells you---
 "I have a sense of humor, but that's not funny." 
                                  ---they don't.

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