Nat addresses

  • Thread starter Thread starter John Doue
  • Start date Start date
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John Doue

I realize this is a very simple question for this NG but I am at the
very bottom of the learning curve here, so please bear with me.

I am using a SMC Barricade 7404 router to connect my laptop (via a
Linksys wireless adapter) and my desktop via an ethernet cable.

My ISP assigns dynamically IP and I have to have DHCP active on the
router. My two machines do not use DHCP to connect to the router. I want
to use the NAT capabilities of the router but have no idea what address
to enter when it requires "global IP address" in the setup screen. Then,
do I need to reconfigure my two machines to new addresses and which ones?

Needless to say, the manual of the router is totally of no help to me.

Regards
 
what is it you want to do? network address translation is typically were you
would take a a public ip adress and asighn that to a computer with a private
ip adress behind the router/firewall this public ip adress (global ip
adress) is typically different than the ipadress asighned by your isp.
if what you are looking to do is make a comuter or service running on that
computer avilible thru the router then you are wanting to either port
forward, or place the computer into a dmz like setting. i'm not familier
with your exact router but there is usually a setting inside the config to
do all of this.
 
jazz said:
what is it you want to do? network address translation is typically were you
would take a a public ip adress and asighn that to a computer with a private
ip adress behind the router/firewall this public ip adress (global ip
adress) is typically different than the ipadress asighned by your isp.
if what you are looking to do is make a comuter or service running on that
computer avilible thru the router then you are wanting to either port
forward, or place the computer into a dmz like setting. i'm not familier
with your exact router but there is usually a setting inside the config to
do all of this.

I realize this is a very simple question for this NG but I am at the
very bottom of the learning curve here, so please bear with me.

I am using a SMC Barricade 7404 router to connect my laptop (via a
Linksys wireless adapter) and my desktop via an ethernet cable.

My ISP assigns dynamically IP and I have to have DHCP active on the
router. My two machines do not use DHCP to connect to the router. I want
to use the NAT capabilities of the router but have no idea what address
to enter when it requires "global IP address" in the setup screen. Then,
do I need to reconfigure my two machines to new addresses and which ones?

Needless to say, the manual of the router is totally of no help to me.

Regards
Click to expand...
No, I do not want to make my two computers accessible from outside my
home, just the opposite, I want to hide them so that they are
practically inaccessible to hackers. So DMZ (fortunately, I had come
across that acronym, otherwise I would not have understood a word of
what you said...) is NOT what I want. I just need to know how to setup
the screen that requires a global IP (which one? do I make one up and
how or where do I find this address) and a range of addresses.

Thanks for bearing with me!
Click to expand...
 
ok, i saw the screen your talking about and you don't want to set anythign
in there.
that screen maps public ip addresses to private ip adresses to behind the
router. it even allow more than one computer to offer services.
in essence what nat will do is, lets say you isp gives you an ip adress of
10.0.0.1 (i'm makeing these up) and you local networ has 2 computers with
an ip address of 192.168.1.1 and 192.168.1.2, from the internet (wich by the
way is the global ip adress) someone could try to goto 10.0.0.1 and it
would just reach you router. nothing would happen.
with nat, you could enter 10.0.0.1 as your global ip address and
192.168.1.1 as your inpout in both from boxes then someone could access that
192.168.1.1 computer from the internet by going to 10.0.0.1. also if you
split the services up between 2 different computers you could enter both
local ip addresses in the from boxes and then access either computer by the
services they are running.

again this makes the computers availible to the public instead of making
them hidden. i don't think it is what you want. have you set anything up so
you can get the router working yet? usualy there is a wan port with is what
your broad band will plug into, then you plug you local computers into the
regular ports. if you have cable internet, it is typicle that you need to
unnpolug the power from the cable modem and wait about 30 seconds then plug
it back in before it will start working with another device. (has to do with
the way it will lock to a specific media access adress on the network card
that it conects to so it will only give internet to one computer at a time)


 
jazz said:
ok, i saw the screen your talking about and you don't want to set anythign
in there.
that screen maps public ip addresses to private ip adresses to behind the
router. it even allow more than one computer to offer services.
in essence what nat will do is, lets say you isp gives you an ip adress of
10.0.0.1 (i'm makeing these up) and you local networ has 2 computers with
an ip address of 192.168.1.1 and 192.168.1.2, from the internet (wich by the
way is the global ip adress) someone could try to goto 10.0.0.1 and it
would just reach you router. nothing would happen.
with nat, you could enter 10.0.0.1 as your global ip address and
192.168.1.1 as your inpout in both from boxes then someone could access that
192.168.1.1 computer from the internet by going to 10.0.0.1. also if you
split the services up between 2 different computers you could enter both
local ip addresses in the from boxes and then access either computer by the
services they are running.

again this makes the computers availible to the public instead of making
them hidden. i don't think it is what you want. have you set anything up so
you can get the router working yet? usualy there is a wan port with is what
your broad band will plug into, then you plug you local computers into the
regular ports. if you have cable internet, it is typicle that you need to
unnpolug the power from the cable modem and wait about 30 seconds then plug
it back in before it will start working with another device. (has to do with
the way it will lock to a specific media access adress on the network card
that it conects to so it will only give internet to one computer at a time)


you

private

that

familier

to

ones?

No, I do not want to make my two computers accessible from outside my
home, just the opposite, I want to hide them so that they are
practically inaccessible to hackers. So DMZ (fortunately, I had come
across that acronym, otherwise I would not have understood a word of
what you said...) is NOT what I want. I just need to know how to setup
the screen that requires a global IP (which one? do I make one up and
how or where do I find this address) and a range of addresses.

Thanks for bearing with me!
Click to expand...
Thanks Jazz. After re-reading the help file on my router, I finally came
to the conclusion you describe. Indeed, this would do the opposite of
what I intended.

The problem is the absence of any documentation explaining the basics of
this...Would you recommend any book allowing me to learn the basics of
these addresses, routing, sub-masks and so that I get a handle on what
is going instead of just being satisfied that things work (and they do,
thanks, both machines connect properly to the internet).

Last point: now that my two machines are connected to the router, is
there anyway I can have them talk to each other? They belong to the same
workgroup and previously had a Ethernet cable connection, no longer
possible since my desktop uses the Ethernet port. Any suggestions?

Thanks a lot for taking the time to help.
Click to expand...
 
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