[Okta Webinar] Learn how to a build a cloud-first strategyRegister Now

x
?
Solved

c3750 nat

Posted on 2008-10-06
14
Medium Priority
?
934 Views
Last Modified: 2012-05-05
Howdy,
  I currently have a cisco c3750 switch hooked up to a linksys router. What I'm wanting to do on the Cisco 3750 is to be able to nat. I want to have it so thatall  the linksys see's is 192.168.1.1 which i statically assigned to g1/0/1 which leads to the linksys router. Is this possible?

I enabled ip routing on the switch and turned g1/0/1 into a L3 port. But for some reason I cannot find the NAT command. Any Ideas?
0
Comment
Question by:Paktusjet
  • 8
  • 6
14 Comments
 
LVL 8

Expert Comment

by:sstone55423
ID: 22655919
0
 
LVL 8

Expert Comment

by:sstone55423
ID: 22655922
PAQ
0
 
LVL 2

Author Comment

by:Paktusjet
ID: 22655979
I'm currently in that same situation as the link you provided.

Switch#config t
Switch(config)#ip nat ?
% Unrecognized command
Switch(config)#int fa0/1
Switch(config-if)#ip nat ?
% Unrecognized command

so how would I get NAT enabled? Many accepted solutions in that link stated that NAT was not supported by 3750's. Is that true or false? If so I need a work around.
0
 The Evil-ution of Network Security Threats

What are the hacks that forever changed the security industry? To answer that question, we created an exciting new eBook that takes you on a trip through hacking history. It explores the top hacks from the 80s to 2010s, why they mattered, and how the security industry responded.

 
LVL 2

Author Comment

by:Paktusjet
ID: 22655988
I cannot configure the Linksys. What it has on it has to stay the same with no changes.
0
 
LVL 8

Accepted Solution

by:
sstone55423 earned 1500 total points
ID: 22655998
http://www.tek-tips.com/viewthread.cfm?qid=1159588&page=1
 
AND
http://www.netxg.net/newsxg/2007/cisco-catalyst-3750-series-switch-quick-look/ 
Q. Is NAT supported? A. No. There are no plans to support NAT.
 
Well, I was wondering about that.  Sorry to point you the wrong way.
0
 
LVL 2

Author Comment

by:Paktusjet
ID: 22656028
well can there be a work around? Is there any way that I can mask these IP addresses? This Linksys router does not know about the other networks on my backside. I need some way to wrap the IP's on my backside inside of one usable IP address if I cannot NAT.
0
 
LVL 8

Expert Comment

by:sstone55423
ID: 22656121
Well, just throw a router in there for basic NAT.  A Linksys WRT54G is good, or something like that.  There are other models without wireless that are like $29 at Best Buy.  It will do basic one to many NAT, and solve all of your problems.
0
 
LVL 2

Author Comment

by:Paktusjet
ID: 22656126
well we have limited resources. All I have to work with is that 3750 and a Linksys router.
0
 
LVL 8

Expert Comment

by:sstone55423
ID: 22656127
I know, with the other linksys, that it will look a bit odd...but You seem to have some reason you don;t want the other Linksys to do the NAT.  SO...
Internet-->OLD Linksys-->New Linksys -->CIsco 3750
Does that make sense?  Or can you set the first Linksys to do NAT (or is it out of your realm of control?)
0
 
LVL 2

Author Comment

by:Paktusjet
ID: 22656146
the main linksys is natting but heres how the setup kinda looks..

computer -----> 3750 -----> linksys -----------> modem
                                                    (NAT)

I have one class C given to me. which is 192.168.1.0. I'm running out of room on that C network. So I need to implement 2.0 and 3.0. My Linksys doesnt know about the 2.0 and 3.0 network which Is why I need it to mask them 2 networks. And yes there is a reason behind all of this, but it is fully supported :) I just can't change the linksys.
0
 
LVL 8

Expert Comment

by:sstone55423
ID: 22656197
Change the NAT'ing Linksys to NAT the 192.168.0.0 255.255.0.0    That is, change to use a class B (/16) network instead of a Class C (/24).  Then you get lots more IP addresses, and can still route between them without changing anything on the PC's.
0
 
LVL 8

Expert Comment

by:sstone55423
ID: 22656201
Well, if you truely can't change the existing linksys.  Like I said, get another Linksys.  Make it's outside address 192.168.1.x and then set the inside addresses to 10.1.0.0/24 and you will have plenty of inside addreses.
0
 
LVL 8

Expert Comment

by:sstone55423
ID: 22656202
Whoops  10.0.0.0/8 ot 10.0.0.0/16  (not 24) or you will be no better off.  I better get some sleep.
0
 
LVL 2

Author Closing Comment

by:Paktusjet
ID: 31503686
I just wish there was another way :)
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this article, WatchGuard's Director of Security Strategy and Research Teri Radichel, takes a look at insider threats, the risk they can pose to your organization, and the best ways to defend against them.
Tech spooks aren't just for those who are tech savvy, it also happens to those of us running a business. Check out the top tech spooks for business owners.
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.
In this video we outline the Physical Segments view of NetCrunch network monitor. By following this brief how-to video, you will be able to learn how NetCrunch visualizes your network, how granular is the information collected, as well as where to f…

834 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question