Tanner,
This can easily be done with a single router that has 2 ethernet interfaces.
I suppose you could also use a router with a single fast ethernet interface
and use sub-interfaces on the fa interface.
I have done this recently for a customer and am now experimenting with this
for my home setup. I used a 2621 (2 fast ethernet interfaces) with IOS
12.1(5)T. I used NAT overload (PAT) since my cable modem provider only
permits 1 ip address. Alternately you could configure a NAT pool if you have
more than 1 public ip address.
IOS version 12.1(2)T introduces the "ip address dhcp" command, which allows
a ethernet interface to be dynamically be asigned it's ip address via DHCP;
from say a cable modem or an ADSL connection.
Here is my config:
!
version 12.1
no service password-encryption
!
hostname Router
!
!
ip subnet-zero
!
!
ip name-server 24.93.68.65 !Name servers are dynamically
configured from DHCP
ip name-server 24.93.68.64
!
!
interface FastEthernet0/0
ip address dhcp !Configures ip address via
DHCP
ip nat outside !Establishes the outside interface
for NAT
speed 10 !My cable modem is 10baseT
only
half-duplex
!
!
interface FastEthernet0/1
ip address 10.10.10.1 255.255.255.0 !Configure private address of inside
interface
ip nat inside !Establishes the inside
interface for NAT
speed 100
duplex full
!
ip nat service skinny tcp port 20002 !This allows my IP Phone to pass
thru the NAT
ip nat inside source list 1 interface Fa0/0 overload !Enables PAT
ip classless
ip route 0.0.0.0 0.0.0.0 FastEthernet0/0
no ip http server
!
access-list 1 permit any !Tells the router to NAT/PAT
any ip traffic
!
!
!
end
enjoy!
Tim Medley - CCNA, CCDA
Network Architect
VoIP Engineering Group
704-943-3615 - Phone
704-525-9119 - Fax
877-6-iReady - Helpdesk
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Tanner_Green
Sent: Monday, December 04, 2000 8:26 PM
To: [EMAIL PROTECTED]
Subject: Configuring NAT
Crude Network Diagram Segment
To Internet
/
/
+---------------+
| ADSL Modem |
+---------------+
|
| IP Address that changes on E0
|
+---------------+
| Cisco 2509 |
+---------------+
|
| Serial Link
|
+---------------+
| Cisco 2620 |
+---------------+
|
/
/
To Ethernet Lan Network 10.0.0.0 255.0.0.0
25-50 users.
----------------------------------------------------------
Problem: How do you configure a Cisco 2509 to
accommodate a dynamic IP from an
ADSL modem?
----------------------------------------------------------
Requirements
I am trying to accomplish the above as a lab exercise.
I have been unsuccessful and would appreciate advice.
I want to:
A.) Have the 2509 obtain and store the changing dynamic
IP from the ADSL modem.
B.) Route between the 2509 and 2620 via a serial link
C.) Have the 2620 setup as NAT router for the local
LAN of 240 users.
----------------------------------------------------------
Goal
Trying to use the above equipment to simulate the process
of a Cisco 675, Cayman 3220 or similar SOHO router.
----------------------------------------------------------
Constraints
Cannot purchase routers listed in above goal.
----------------------------------------------------------
Questions
1.) Can this be done? I am unable to find anything
on CCO that gives a sample config of this type.
Ref:
http://www.cisco.com/warp/public/701/60.html
http://www.cisco.com/warp/public/556/index.shtml
2.) Can this be done with one router? Appears no
but the dumb question is the one that you
done ask.
3.) Is there a better way to do this?
---------------------------------------------------------
Thank you for your help.
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