I have looked into doing something similar in one of my branch offices. We
would be getting ADSL provided with an ADSL modem and dynamic IP. We are
getting a PIX-506 to provide firewalling for that office and VPN tunnel
services to our datacentre. The outside interface connected to the ADSL
modem, the inside interface connected to the LAN segment.
PIXOS 5.2 (I believe) supports something Cisco calls EasyIP. EasyIP
*apparently* can use a DHCP client on an interface you specifiy. I know
that IOS does use EasyIP but I'm not 100% sure that IOS supports the same
feature, but am quite confident I've read that it does in my research of the
PIX-506. You will need a minimum of IOS 12.1 or a 12.0(T) image to support
EasyIP. (Corrections are of course welcome)
As far as the rest of the configuration goes, the equipment looks right,
though you may want to look into a WIC-1FE. This is a WIC with a Fast
Ethernet interface and I've read about this WIC coming out for the 1700
series soon, it may be supported in an upcoming revision of IOS for the
2600s. Having this WIC would allow you to eliminate the 2509 altogether.
You stated that you want to setup NAT on the 2620. I assume this will be a
NAT 'overloading' or PAT implementation. Be careful here, you may want to
move your NAT implementation to the 2509. The outside interface of your
2509 will have the external IP and of course you will want to give the
inside interface an internal one. The interface on the 2620 attached to the
2509 will also have an internal IP as well as the interface connected to
your LAN segment. If you implement NAT on the 2620, you will be NATing all
your internal addresses to one other internal address and passing that
traffic with that address to the 2509. Once at the 2509, you would have to
NAT the traffic again to get it on an external, routeable IP. (Is NATing
twice even possible?) With the NAT on the 2509 only, you could just route
all your LAN traffic destined for the WAN to the 2509 vanila style and let
it translate them once to one external IP.
That's my thoughts, open to correction or suggestions of course.
HTH,
Greg
""Tanner_Green"" <[EMAIL PROTECTED]> wrote in message
90hkbt$qpp$[EMAIL PROTECTED]">news:90hkbt$qpp$[EMAIL PROTECTED]...
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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