NAT can't port mapping to internal website

Dear all:

I've create a Win2003 be my NAT, setup ICF and ICS.

The client can connect to internet via my NAT.

But when I create port mapping on my ICF, such as port 80,

then it can't pass to my internal website.

I've try other port, such as 25 or 21... etc, all can't pass to my internal
server.

How do I do to make port mapping work?


Many thanks for your reply!

Dear all:

I think my problem was solved.

If I try telnet port 25 on my NAT server, then it can't work.

But if I try same thing on other computer which at out of my NAT, then its
work.

I'm not sure why, but looks like its work.


"David" <(E-Mail Removed)> ¼¶¼g©ó¶l¥ó·s»D
:#(E-Mail Removed)...
> Dear all:
>
> I've create a Win2003 be my NAT, setup ICF and ICS.
>
> The client can connect to internet via my NAT.
>
> But when I create port mapping on my ICF, such as port 80,
>
> then it can't pass to my internal website.
>
> I've try other port, such as 25 or 21... etc, all can't pass to my
internal
> server.
>
> How do I do to make port mapping work?
>
>
> Many thanks for your reply!
>
>

wouldn't it be a different IP from internal to external? Once NAT changes
the IP I mean.

"David" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Dear all:
>
> I think my problem was solved.
>
> If I try telnet port 25 on my NAT server, then it can't work.
>
> But if I try same thing on other computer which at out of my NAT, then its
> work.
>
> I'm not sure why, but looks like its work.
>
>
> "David" <(E-Mail Removed)> ¼¶¼g©ó¶l¥ó·s»D
> :#(E-Mail Removed)...
>> Dear all:
>>
>> I've create a Win2003 be my NAT, setup ICF and ICS.
>>
>> The client can connect to internet via my NAT.
>>
>> But when I create port mapping on my ICF, such as port 80,
>>
>> then it can't pass to my internal website.
>>
>> I've try other port, such as 25 or 21... etc, all can't pass to my
> internal
>> server.
>>
>> How do I do to make port mapping work?
>>
>>
>> Many thanks for your reply!
>>
>>
>
>

Yes it is.
Its my first time to create my own NAT, before that I always use IP sharing
to be my NAT.


"mmac" <(E-Mail Removed)> ¼¶¼g©ó¶l¥ó·s»D
:(E-Mail Removed)...
> wouldn't it be a different IP from internal to external? Once NAT changes
> the IP I mean.
>
> "David" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
> > Dear all:
> >
> > I think my problem was solved.
> >
> > If I try telnet port 25 on my NAT server, then it can't work.
> >
> > But if I try same thing on other computer which at out of my NAT, then
its
> > work.
> >
> > I'm not sure why, but looks like its work.
> >
> >
> > "David" <(E-Mail Removed)> ¼¶¼g©ó¶l¥ó·s»D
> > :#(E-Mail Removed)...
> >> Dear all:
> >>
> >> I've create a Win2003 be my NAT, setup ICF and ICS.
> >>
> >> The client can connect to internet via my NAT.
> >>
> >> But when I create port mapping on my ICF, such as port 80,
> >>
> >> then it can't pass to my internal website.
> >>
> >> I've try other port, such as 25 or 21... etc, all can't pass to my
> > internal
> >> server.
> >>
> >> How do I do to make port mapping work?
> >>
> >>
> >> Many thanks for your reply!
> >>
> >>
> >
> >
>
>

"David" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Dear all:
>
> I think my problem was solved.
>
> If I try telnet port 25 on my NAT server, then it can't work.
>
> But if I try same thing on other computer which at out of my NAT, then its
> work.
>
> I'm not sure why, but looks like its work.

That is perfectly normal. NAT does not make "U-Turns",...it creates a
situation where the Source and Destination MAC address in the packets are
both the same MAC address. Ethernet, which operates via MAC addresses, can
not reconcile such a situation and shoots itself in the head.



--

Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com