cox.net FYI
Tom Achtenberg
plug-discuss@lists.plug.phoenix.az.us
09 Feb 2002 13:02:09 -0700
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I agree with this setup. I'm useing a simular one only with a dial up
and have 6 computers connecting to the outside most of the time with no
problem unless one of us wants to download something.
On Sat, 2002-02-09 at 12:09, George Toft wrote:
Hi Lisa,
I highly recommend this configuration (bear with the ASCII art):
Cox ---- modem --- firewall --- hub/switch ---- computer
+--- computer
+--- computer
+--- computer
+--- computer
The main benefit here is that your ISP only sees one MAC and
you can have as many computers on the backside as you have
money/electricity to support (my record was 10 computers on
a cable modem service that only allowed one computer per IP
address).
Another benefit is when the CSR tells you to reboot Windows,
you log into the firewall (of course it's a Linux box, right?),
type (as root):
ifdown eth0; sleep 10; ifup eth0; ifconfig -a
(assuming eth0 is the public side) then go to your workstation,
play the Windows boot up music so they think you've rebooted,
and then you can get down to troubleshooting the real issue.
The firewall uses DHCP on the public side, private IPs on
the backside, and is a Linux box with NAT enabled. I have
two examples of this setup on my web site (one for cable and
one for DSL).
Regards,
George
Lisa Winkler wrote:
>
> I have been using 2 @home ips. They stopped working yesterday. I couldn't reach a DHCP server, so I couldn't get a cox ip.
>
> I finally got through to tech support (the wait is 1.5 hours) and the guy told me to plug the modem directly into the computer instead of going through the hub. I know this is on their standard list of things to tell the user to do and explained to the guy that it wouldn't solve anything if the DHCP server was unreachable. Finally I agreed to do it anyway. I was connected instantly!
>
> The t.s. guy explained that the software on their DHCP server (it's probably running windows!) is having problems when the modem reports that there are 2 different MAC addresses behind it. Apparently when this happens it just refuses to respond to my request. He says they are working on it, doesn't know when it will be fixed, but until it is you won't be able to have 2 computers with real-world IPs connected because if they are both up at the same time the DHCP server will refuse to assign them ips. I guess this is my official kick in the ass to try to get NAT working (instead of a bridge as I am currently using).
>
> Anyway, just a public service in case anyone else is dead in the water but still reading mail!
>
> Lisa
>
> ________________________________________________
> See http://PLUG.phoenix.az.us/navigator-mail.shtml if your mail doesn't post to the list quickly and you use Netscape to write mail.
>
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> http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss
________________________________________________
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--
Tom Achtenberg
Every day over 30,000 children die from hunger related causes
Visit http://www.ybnormal.org to find out how YOU can help.
Registered Linux User #242974 (See http://counter.li.org)
Visit my home page at http://achtenberg.com
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I agree with this setup. I'm useing a simular one only with a dial up and have 6 computers connecting to the outside most of the time with no problem unless one of us wants to download something.
<BR>
<BR>
<BR>
On Sat, 2002-02-09 at 12:09, George Toft wrote:
<BLOCKQUOTE>
<PRE><FONT COLOR="#731721"><FONT SIZE="3"><I>Hi Lisa,</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I></FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>I highly recommend this configuration (bear with the ASCII art):</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I></FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>Cox ---- modem --- firewall --- hub/switch ---- computer</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I> +--- computer</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I> +--- computer</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I> +--- computer</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I> +--- computer</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I></FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I></FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>The main benefit here is that your ISP only sees one MAC and</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>you can have as many computers on the backside as you have</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>money/electricity to support (my record was 10 computers on</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>a cable modem service that only allowed one computer per IP </FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>address).</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I></FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>Another benefit is when the CSR tells you to reboot Windows,</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>you log into the firewall (of course it's a Linux box, right?), </FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>type (as root):</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I> ifdown eth0; sleep 10; ifup eth0; ifconfig -a</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>(assuming eth0 is the public side) then go to your workstation,</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>play the Windows boot up music so they think you've rebooted, </FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>and then you can get down to troubleshooting the real issue.</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I></FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>The firewall uses DHCP on the public side, private IPs on</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>the backside, and is a Linux box with NAT enabled. I have</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>two examples of this setup on my web site (one for cable and</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>one for DSL).</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I></FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>Regards,</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I></FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>George</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I></FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I></FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>Lisa Winkler wrote:</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>> </FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>> I have been using 2 @home ips. They stopped working yesterday. I couldn't reach a DHCP server, so I couldn't get a cox ip.</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>> </FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>> I finally got through to tech support (the wait is 1.5 hours) and the guy told me to plug the modem directly into the computer instead of going through the hub. I know this is on their standard list of things to tell the user to do and explained to the guy that it wouldn't solve anything if the DHCP server was unreachable. Finally I agreed to do it anyway. I was connected instantly!</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>> </FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>> The t.s. guy explained that the software on their DHCP server (it's probably running windows!) is having problems when the modem reports that there are 2 different MAC addresses behind it. Apparently when this happens it just refuses to respond to my request. He says they are working on it, doesn't know when it will be fixed, but until it is you won't be able to have 2 computers with real-world IPs connected because if they are both up at the same time the DHCP server will refuse to assign them ips. I guess this is my official kick in the ass to try to get NAT working (instead of a bridge as I am currently using).</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>> </FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>> Anyway, just a public service in case anyone else is dead in the water but still reading mail!</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>> </FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>> Lisa</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>> </FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>> ________________________________________________</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>> See http://PLUG.phoenix.az.us/navigator-mail.shtml if your mail doesn't post to the list quickly and you use Netscape to write mail.</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>> </FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>> PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>> http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>________________________________________________</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>See http://PLUG.phoenix.az.us/navigator-mail.shtml if your mail doesn't post to the list quickly and you use Netscape to write mail.</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I></FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I>http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss</FONT></FONT></I>
<FONT COLOR="#731721"><FONT SIZE="3"><I></FONT></FONT></I></PRE>
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<PRE>--
Tom Achtenberg
Every day over 30,000 children die from hunger related causes
Visit http://www.ybnormal.org to find out how YOU can help.
Registered Linux User #242974 (See http://counter.li.org)
Visit my home page at http://achtenberg.com</PRE>
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