Bob Schwier on 22 Dec 2009 09:01:34 -0800

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Re: [PLUG] WAP DHCP & Cable DHCP and some static IP's

My question is probably  more basic than the person seeking this reply, so I am
top posting as as far as I can tell I am on the same subject but at a far more
lower level.  I've never had to create a network before.
I want to create an internal network for three computers and two printers.
Cavalier is my internet provider and takes 24 bits, so the network must work
on the remaining eight bits if I understand correctly the IP statement.
This computer uses Ubantu 8.04 and connects by ethernet cable to the box
provided by Cavalier (Zhone 6218-I2-200-0CL)  The upstairs printer is an
old 9 pin attached by serial port to this computer.  The two other machines
will have to use wireless.  One will be attached to a Canon printer.  The other
is a laptop.  The one on the Canon has to be a Windows box because Wine did
not work with the Brother/Babylock embroidery program. 
I know that the answer has to be in the howtos but my eyes keep glazing over
from the turgid prose before I get to the meaty part.

--- On Mon, 12/21/09, Lee Marzke <> wrote:

From: Lee Marzke <>
Subject: Re: [PLUG] WAP DHCP & Cable DHCP and some static IP's
To: "Philadelphia Linux User's Group Discussion List" <>
Date: Monday, December 21, 2009, 4:36 PM

Claude M. Schrader wrote:
> Ed,
> I would give the WAP a static IP in the same subnet as the cable
> modem/router, and disable the DHCP server on the wap, and plug everything
> in. Let the cable device manage IPs.
> You do not want to plug everything in as is. Having 2 DHCP servers on a
> network may cause problems, and even if it doesn't, it overcomplicates things
> and will make troubleshooting future problems more difficult in the
> future.
> Claude
The existing static IP's can't be inside the range of assigned IP's.

I agree with using one DHCP.  If you want to have static IP's for your
print server use a DHCP server that supports 'static IP's'

For instance the Linksys WRT-54G,  with OpenWRT or DD-WRT firmware will
do this.

If your using web and mail servers inside your office,  you might want
to consider
a multi-zone firewall  and UTM in  place of the commodity cable device
for improved
security.  The cable device wasn't really designed for security for
hosting local servers.

Also putting outside hosted servers ( email + web ) on the same server
as your
DNS and file server is very bad security practice.

You generally put your outside servers in a DMZ (orange) zone so if they
get rooted
they still don't have access to your file servers on your LAN.

I use the free opensource Endian Firewall

This does DNS, DHCP,  Transparent Proxy of( DNS, SMTP, Web, FTP ),
virus filtering,  Spam checking,  QoS ( for VOIP )  ,   OpenVPN  and more.


"Between subtle shading and the absence of light lies the nuance of iqlusion..."  - Kryptos

Lee Marzke,
IT Consultant, VMware, VCenter, SAN storage, infrastructure, SW CM
+1 484-961-0369  voice         +1 484-348-2230 fax

> On 11:57 Mon 21 Dec     , Ed Ackerman wrote:
>> It's something that is right at the edge of what passes for my brain, but
>> I need a nudge to accomplish this.
>> There is a cable device (, can/serves DHCP (,
>> a WAP ( that can/serves DHCP (,
>> a printserver ( that everyone needs to use,
>> a Linux server (, runs mail, web, dns, and Samba.
>> What I want is for everything to work together. There are 5 static IPs
>> available, and 10 devices. Cable, WAP, and server all need static IP's.
>> The printserver is a maybe. There are other devices, laptops, desktops
>> nothing that requires a static IP.
>> Now to the question can I just plug everything into the existing switch
>> and plug the switch into the cable device and will it all work or what am
>> I missing?
>> ---
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