DSL Network Connection with a Switch

[The Subject ®]

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Is there anyway, using Windows XP, that I can share a DSL connection
with other computers in my home network, using a LinkSys Work Group
Switch (Model EZXS55W). We can see each others files, but the other
computers can not log on to the internet. They are all on Windows 98,
where I am on Windows XP Home.

I did use a LinkSys Broadband Router in the past, however the
connection kept cutting out when I set the router up for PPOE
settings.

Any suggestions would be appreciated.

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[Thorsten Matzner]

Is there anyway, using Windows XP, that I can share a DSL connection
with other computers in my home network, using a LinkSys Work Group
Switch (Model EZXS55W). We can see each others files, but the other
computers can not log on to the internet. They are all on Windows 98,
where I am on Windows XP Home.

This should work, but you may have to check the router settings for
this.
To set up network connections, run the Network Setup Wizard on the
Windows XP machine. When it is finished, let it create the Wizard CD
to run the Wizard on the Windows 98 computers as well.

 

[The Subject ®]

I have tried it and from the Win 98 computers they say they can not find a
"Gateway". It is strange, all the computers can exchange files with each
other, however the Win98 computers can not get on the net.

This make a change in the set up so please let me know. The WinXP Computer
and 2 of the Win 98 Computers are using Symantec Internet Security
(Firewall). The 3rd Win 98 Computer has no firewall protection on it. Should
I open certain ports on the firewall to allow them all access to the net? If
so which computers and which ports?

Thanks a million

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[Thorsten Matzner]

I have tried it and from the Win 98 computers they say they can not find a
"Gateway". It is strange, all the computers can exchange files with each
other, however the Win98 computers can not get on the net.

This make a change in the set up so please let me know. The WinXP Computer
and 2 of the Win 98 Computers are using Symantec Internet Security
(Firewall). The 3rd Win 98 Computer has no firewall protection on it. Should
I open certain ports on the firewall to allow them all access to the net? If
so which computers and which ports?

I would disable all firewalls at first to make sure that they are not
causing this problem.

 

[Kenneth Roback]

Hi,

Sorry for barging in like this and asking some maybe stupid questions, but:

Since you say that the 3rd Win 98 Computer has no firewall protection on it
and still not can access Internet (if I understand it right), I doubt that
the trouble is firewall related.

Have you defined a default gateway at all in your computers
under Internet Protocol (TCP/IP) and properties ?
If you have, what does it say and point to ?

And how have you defined your computers separate IP addresses ?


Regards

/Kenneth

PS. Please respond directly to this newsgroup.


"The Subject ®" skrev:

 

[The Subject ®]

I let each computer automatically choose a IP address. Is this wrong?

Thanks


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[Kenneth Roback]

Firstly a computer doesn't choose an IP address...
Either you set it manually under Internet Protocol (TCP/IP) and properties
or it gets it's IP address from a DHCP server.

I don't know how much you know about networking, so bare with me...

Usually many Internet Providers only supply you with only one IP adress from their DHCP server.
This meaning that you only can use one computer towards Internet with that IP address.
So if you have several computers and only gets one IP address from your provider it wouldn't work.
This since every active computer needs to have an unique IP address in order to be able to
distinguish which one is "talking" to Internet and should have the correct response from Internet.

This is quite common and the solution in that case is to have either a hardware firewall,
router or gateway acting as a gateway between your Internet Provider and your local network.
It's necessary that it can handle NAT (Network Address Translation).
It's a good feature (but not absolutely necessary) if it also can act as a DHCP server itself
towards your local network.

This means that the IP address you get from your Internet Provider's DHCP server is taken by
that gateway in order to use towards your Internet Provider and Internet,
whilst the gateway itself (if it can act as a DHCP server) gives your computers local IP addresses
on your local network when you turn them on.
However if the gateway cannot act as a DHCP server, you will have to manually set each
computers IP addresses under Internet Protocol (TCP/IP) and properties.
I myself would prefer setting the IP addresses manually though and have done so in my network.

In your case you say that your computers can communicate with each other on your local network,
indicating that they must have received an unique IP address from somewhere though, so do you
know if your Internet Provider supply you with more than one IP address or if you have a DSL modem
or something having this DHCP feature active ?

If you don't know then go to a command prompt (MSDOS prompt) on each computer and enter
the command: netstat -n
and you'll see what local IP address each computer have.
If they say something like: 192.168.0.something then your computers doesn't get their IP addresses
from your Internet Provider but from some equipment you have in your local network.

On your XP computer, go to a command prompt (MSDOS prompt) and enter the command: ipconfig
and you should get some information about its IP address, netmask and default gateway.

Return with the information you gathered and we'll see if this information can give a clue...


Regards

/Kenneth


"The Subject ®" skrev:

 

[The Subject ®]

Before I forget, thank you for all your help.

First off my knowledge of networks is basic, just enough to be dangerous and
screw things up. Here is the information on the main computer (runs on XP
Home)

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 192.168.1.100
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1

PPP adapter ISP Name:

Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 68.126.80.120
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . : 68.126.80.120


From what I can tell from the other computers they get IP Addresses of
192.168.1.10x

From what I can gather, from what you are saying, I most likely should set
each of the other computers IP address and gateway.

Thanks


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[The Subject ®]

Ken,

Maybe I am jumping the gun. But I took one of the other computers and set
the ip at 192.168.1.103, Subnet Mask at 255.255.255.0, and Gateway at
192.168.1.1

After restarting I could see still see the other computers in the network,
but that computer could not get on to the net. Additionally when I ran the
Windows XP Network Wizard on the computer (not the main one), I got an error
message saying it that it could not find a proper gateway.

Once again thank you for your help.

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[Kenneth Roback]

Ok,

Can you do the following test and see what happens:

1. Turn off every computer.
2. Turn off and then back on the power to your DSL modem (PPP adapter) or what they call it.

3. Now only turn on one of the computers that doesn't work towards Internet
and make sure that you haven't set a fixed IP address on that one.
(i.e. that it get an IP address automatically).

4. Check again what local IP address it gets by the command: netstat -n
and make a note of it.

5. Now try to access Internet, does it work ?
If it does, make the same test with every computer one at a time
by following the procedure mentioned above and make sure that only one computer
at a time is powered on.

Return with the results of the tests.


Regards

/Kenneth




"The Subject ®" skrev:

 

[Thomas Wendell]

If yor're on 192.168.x.x , I don't think you can have gateway at
68.126.80.120, it should be in the same net (???)



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[Kenneth Roback]

68.126.80.120 is a public IP address from the Internet Provider
(Southwestern Bell Internet Service, in this case), and has nothing to do
with the local network addresses.

The Internet Assigned Numbers Authority (IANA) has reserved the
following three blocks of the IP address space for private internets:

10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)

If anyone is interested in more information about this have a look at:

http://www.faqs.org/rfcs/rfc1918.html

Therefore, since "The Subject ®" says that he/she has IP addresses in the range
192.168.1.something, this indicate that he/she has local addresses in his/her local network,
which is quite correct and these cannot be used on Internet which is also quite correct.

Regards

/Kenneth

Thomas Wendell skrev:

 

[Kenneth Roback]

As an extra test when you are connected to Internet, go to these two websites:

http://www.whatismyip.org/
http://www.showmyip.com

they will both clearly tell you what global IP address you have recevied from
your Internet Provider to use when you are surfing the Internet and they are
the addresses of your Internet Provider, not your local network.


Regards

/Kenneth


"The Subject ®" skrev:

 

[The Subject ®]

Kenneth,

I did as you requested and the first computer did not access the internet at
all. For the record this computer did not have a static IP address set in
the computer or Gateway, in addition it has no firewall software.

It did return with an IP address of 192.168.1.100 and a gateway of
192.168.1.1

It did dawn on me that it should not be able to access the internet though
since there is no software to log on to the internet on it. The only one of
the four computers that has actual software to log on to the internet is the
main computer which has no problem. I have, several months, ago placed the
software to log in to the internet on the other computers but that did not
work.

From my understanding, and correct me if I am wrong, if the main computer
logs into the internet, the others should be able to share the connection to
connect to the internet via the switch.

Thanks again for all your help and everyone else's.



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[Kenneth Roback]

No software...Well, no wonder...

/Kenneth

"The Subject ®" skrev: