I would like to set up a web server on my PC. So that I can have
access to my computer whatever my location.
I do not want the computer open for public access and my WindowsXP
firewall is in place with the HTTP and FTP ports left open.

I have successfully configured Apache Web Server, and can view the
webpages when I type http://localhost:8080
However, I cannot access these pages web pages when I type
http://myipaddress, and neither can anybody else.

I asked a friend of mine to ping my IP address and it timed out.
But I get a response if I ping myself.

I've been told by him that this is because my IP address actually
belongs to my cable modem, and I will need to configure this to open
the right ports.

Is this true?
If so how do I do this as I cannot see any configuration controls on
it.
My modem is a Motorola Surfboard SB5100.

If not can someone tell me what the right course of action is?

Thanks in advance.

Elle

Your Motorola Surfboard SB 5100 uses it's own IP address.
You can use a USB cable from your computer's USB port, to the USB port on
the back of the Surfboard.
And connect to the Internet that way, running off the surfboard's IP
address.
While running of the USB port the Surfboards Ethernet connection will not
work.

In normal operation, when you just use an Ethernet cable from your
computer's network card to the
Ethernet connection on the Surfboard, your computer gets its own IP address.

I'm basing my info off using my Surfboard 4200.
I also worked in cable modem telephone tech support for 3 years.


"Elle Brent" <lbrent22@yahoo.com> wrote in message
news:2f4c4002.0407031303.135eab0a@posting.google.c om...

Elle Brent wrote:

What address does your computer get? The SB5100 can be used as a dhcp
server and NAT or get address from your ISP.

--

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Bill M. wrote:

Not quite. the SB5100 can be configured as a dhcp server & NAT or to simply
pass through the IP.

--

(This space intentionally left blank)

In article <2f4c4002.0407031303.135eab0a@posting.google.com>, lbrent22
@yahoo.com says...
What ISP and type of account do you have? Most forbid running servers.
Plus, the uplink speed is so slow (usually only 256K) that it's not very
useable.

--
If there is a no_junk in my address, please REMOVE it before replying!
All junk mail senders will be prosecuted to the fullest extent of the
law!!
http://home.att.net/~andyross

phoenix wrote:

According to the info that came with my modem, if a computer requests an
address, while the modem is in standby mode, the modem will assign the IP
to as many as 32 computers and use NAT. Does this not work with
Blueyonder?

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(This space intentionally left blank)

James Knott wrote:
It will assign IP addresses to up to 32 computers, but that doesn't mean
it is a NAT router. Once the Internet connection comes back up, only
computers with public IP addresses assigned by the provider will have
access. The feature you're speaking of allows a LAN to operate even if
there is no active connection to the Internet. Most modern cablemodems
will do that. It's not a feature unique to the SB5100.

--
Warren H.

==========
Disclaimer: My views reflect those of myself, and not my
employer, my friends, nor (as she often tells me) my wife.
Any resemblance to the views of anybody living or dead is
coincidental. No animals were hurt in the writing of this
response -- unless you count my dog who desperately wants
to go outside now.
Blatant Plug: Spend your Amazon gift certificates here:
http://www.holzemville.com/mall/associateshop.html

phoenix wrote:


Here's what the modem configuration says.


"DHCP Server Enabled
The SURFboard cable modem can be used as a gateway to the Internet by a
maximum of 32 users on a Local Area Network (LAN). When the Cable Modem is
disconnected from the Internet, users on the LAN can be dynamically
assigned IP Addresses by the Cable Modem DHCP Server. These addresses are
assigned from an address pool which begins with 192.168.100.11 and ends
with 192.168.100.42. Statically assigned IP addresses for other devices on
the LAN should be chosen from outside of this range"

I would assume that this would imply NAT is use. Otherwise, how could 32
computers use it as a gateway? Incidentally, since there's only one
ethernet connection, a separate hub or switch would be required to share
the connection.



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Warren wrote:


Then please read the following, which I copied from the modem. How does it
act as a "gateway to the Internet by a maximum of 32 users" , without NAT?

DHCP Server Enabled
The SURFboard cable modem can be used as a gateway to the Internet by a
maximum of 32 users on a Local Area Network (LAN). When the Cable Modem is
disconnected from the Internet, users on the LAN can be dynamically
assigned IP Addresses by the Cable Modem DHCP Server. These addresses are
assigned from an address pool which begins with 192.168.100.11 and ends
with 192.168.100.42. Statically assigned IP addresses for other devices on
the LAN should be chosen from outside of this range

--

(This space intentionally left blank)

"James Knott" <james.knott@rogers.com> wrote in message
news:NsYFc.718489$Ar.593964@twister01.bloor.is.net .cable.rogers.com...
The same way routers and bridges have been working for years before NAT was
used: they simply move packets between interfaces according to either
Ethernet address (bridges) or IP addresses (routers). In the case of the
Surfboards, the manual is telling us that the device supports up to a
maximum of 32 IP address on the LAN side. This is actually quite small when
compared to a commercial router, however it is more then enough for the
typical home network.

NAT is a mechanism to allow multiple private IP addresses to share a single
public IP address. If broadband providers didn't charge per IP address, a
big reason for NAT routers would go away.

-Gary

James Knott wrote:

It acts as a gateway to the Internet for up to 32 users when each of
those users has a public IP address. But when you disconnect the
cablemodem from the Internet, the modem will assign private range IP
addresses to any clients connected to it. NAT is not involved in any of
this.

Let me put it another way:

1. When the modem is connected to the Internet, you can connect up to 32
clients, assuming that your ISP will give you 32 IP addresses. (In the
real world, this isn't going to happen with residential cable internet
service, nor would there even be a need for it to happen. But the modem
can do it if it were ever called to do it.) Each client needs a public
IP address assigned by the ISP for this to work.

2. When the modem is NOT connected to the Internet, and thus is not
connected to an external (your ISP's) DHCP server, it acts as it's own
DCHP server, and will assign private range IP addresses to up to 32
clients connected to it. So if you have a LAN with 32 clients connected
through hubs to the modem, the modem will assign them all private range
IP addresses. If you aren't using static IP addresses, and you aren't
using a non-TCP/IP protocol, you're going to need a DHCP server for your
LAN to work, and the modem will act as that DHCP server.

3. If the modem was off-line when you connected all the clients, then
the DHCP server in the modem would go ahead and assign private range IP
addresses to each of the clients. If the modem was then put on the
Internet, none of those clients would have access to the internet until
their lease is renewed, and they get a public IP address from the ISP's
DHCP server. If the number of clients connected exceeds the number of IP
addresses allowed by the ISP, any further clients will get private range
IP addresses, and will not have access to the Internet.


There is no NAT involved in any of this. The ISP will only route traffic
to the devices with public range IP addresses. Any device with a private
range IP address assigned by the modem will not have access to the
Internet.

Just because a small device has a DHCP server in it doesn't mean that
NAT is involved. They are two separate concepts. You can use a DHCP
server and NAT together, but they both can exist on their own, too. And
there is nothing in the SB5100 literature that even hints that there is
NAT involved at all.

--
Warren H.

==========
Disclaimer: My views reflect those of myself, and not my
employer, my friends, nor (as she often tells me) my wife.
Any resemblance to the views of anybody living or dead is
coincidental. No animals were hurt in the writing of this
response -- unless you count my dog who desperately wants
to go outside now.
Blatant Plug: Spend your Amazon gift certificates here:
http://www.holzemville.com/mall/associateshop.html