How to check my IP???

[Bill Campbell]

On Sat, Dec 10, 2005, Tony Alfrey wrote:
>Bill Campbell wrote:
>>On Wed, Dec 07, 2005, Net Llama! wrote:
>>
>>>On Wed, 7 Dec 2005, Marcio A. Regalado wrote:
>>>
>>>>Hello everybody !!!!
>>>>
>>>>This silly message is to ask how can I check my actual IP I'm a formerly
>>>>winbug user so I don't know prety much about linux and I'm trying to
>>>>migrate so I'm sking if you guys can please help me with this issue.
>>>
>>>Run ifconfig as root
>>
>>
>>If you're behind a NAT firewall and are interested in what your IP appears
>>to the real world, there are sites that will display this.  We have one at:
>>
>>	http://www.celestial.com/showinfo_form
>
>I have a question about this; I am network stupid so consider that when 
>replying.
>We're on a Comcast cable modem.
>I connect the the cable modem with an Apple Airport Extreme wireless 
>router/firewall gizmo.  The configuration utility for the Airport 
>Extreme says that I am assigned an IP address via DHCP and NAT and the 
>address that I see at my end always looks something like 10.0.1.5 or 
>10.0.1.11 which is, of course, because we're behind the firewall 
>represented by the Apple box.
>The number I get when I use your website is something like 24.6.156.161. 
> Maybe it changes as time goes by because Comcast says that they assign 
>one address dynamically to each user (I haven't checked to see if this 
>is true, yet).  So I assume that this number that I see is somehow the 
>IP address of the "cable" or wireless router attached to the cable?

As Kurt and other explained, your Airport box gets an IP from
your cable provider which is visible to the outside world, and is
what it uses to send/receive IP packets to the 'Net.  The Airport
has a private set of IP addresses in the 10.0.1.x range, and
assigns private IP addresses from that using the DHCP protocol.

I haven't used any of the Airport boxes, but I assume that they
have a web-based configuration utility that will show you the
range of IP addresses assigned by DHCP, and other configuration
parameters for the WAN (Wide Area Network, aka Internet) side of
the box.

The WAN ip address of the Airport is assigned a public address by
Comcast using DHCP.  Other broadband providers may use different
methods which the broadband provider should be able to explain.

If you have boxes that you want to have on fixed IP addresses on
the 10.0.1.x private side (printers or whatever where you you don't
want their IP address to change), you should look at the range of
IP addresses the Airport is assigning via DHCP, and assign the
fixed IP addresses outside of that range.  Make sure that you
don't assign anything to the Airport's address, probably the
lowest address, 10.0.1.1.

Bill
--
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URL: http://www.celestial.com/

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