Re: resubnetting
- From: "Phillip Windell" <philwindell@xxxxxxxxxxx>
- Date: Thu, 19 Jun 2008 10:23:35 -0500
"Will Sellers" <willsellers@xxxxxxxxxxx> wrote in message
news:ZQg6k.2440$ul.663@xxxxxxxxxxx
For the sake of simplicity...
I'm afraid there is no simplicity with this stuff,...it can get complicated.
If you have less than 240 hosts I would not even mess with this unless I
knew for a fact that I would grow beyond 254 hosts. I have done it
needlessly in the past and even broken down the new segment into even more
smaller pieces,....and it just wasn't worth the trouble,...but is even more
trouble to "undo". So I have had to leave it that way.
we have a 48 port switch
connected to the switch is our DHCP server 1 nic card
and a dual band T1 router to the Internet.
What about the Firewall? Something has to be NATing your LAN Addresses.
The T1 Routers tend to just be just simple (no-NAT) routers running on
Public IP#s,...the Firewall sits between them and the LAN.
What I am trying to understand is where the LAN Router is plugged in.
If I add a new IP segment say 198.168.1.0, will my mask need to be
changed?
So if I follow your advice, will the DHCP issue IP's on the new segment as
needed?
To clairfy, nothing will involve the T1 router. The LAN Router is something
that you will have to buy/add.
One interface on the LAN Router gets an IP for the existing LAN segment
(just pick a number) and it will plug into one of your existing LAN Switches
(doesn't matter where).
The opposite Ethernet Interface will get an IP# from a completely new IP
Segment (avoid low numbers like "1" or "0" in the third octet). The router
interface will plug into a new Switch that you will have to buy/add unless
you are familar with VLANs and can split up an existing Switch into
segments. I would discourage the use of VLANs unless you are really familar
with doing this stuff, in which case you probably would never have had to
post to this group in the first place.
Now this new LAN Router will become the new Default Gateway for the entire
LAN (all segments that it touches). The Default Gateway of the Router
itself will be the Firewall NAT Device.
The Firewall NAT Device will need two things:
1. A Static Route that tells it to use the LAN Router to reach the new
Segment on the opposite side.
2. It will need the IP Range of all (both?) of the LAN Segments added to the
Local Address Table so that it properly interprets those addresses as
originating from the LAN and not the Internet
--
Phillip Windell
www.wandtv.com
The views expressed, are my own and not those of my employer, or Microsoft,
or anyone else associated with me, including my cats.
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