• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 937
  • Last Modified:

c3750 nat

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
Paktusjet
Asked:
Paktusjet
  • 8
  • 6
1 Solution
 
sstone55423Commented:
PAQ
0
 
PaktusjetAuthor Commented:
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
SMB Security Just Got a Layer Stronger

WatchGuard acquires Percipient Networks to extend protection to the DNS layer, further increasing the value of Total Security Suite.  Learn more about what this means for you and how you can improve your security with WatchGuard today!

 
PaktusjetAuthor Commented:
I cannot configure the Linksys. What it has on it has to stay the same with no changes.
0
 
sstone55423Commented:
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
 
PaktusjetAuthor Commented:
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
 
sstone55423Commented:
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
 
PaktusjetAuthor Commented:
well we have limited resources. All I have to work with is that 3750 and a Linksys router.
0
 
sstone55423Commented:
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
 
PaktusjetAuthor Commented:
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
 
sstone55423Commented:
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
 
sstone55423Commented:
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
 
sstone55423Commented:
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
 
PaktusjetAuthor Commented:
I just wish there was another way :)
0

Featured Post

SMB Security Just Got a Layer Stronger

WatchGuard acquires Percipient Networks to extend protection to the DNS layer, further increasing the value of Total Security Suite.  Learn more about what this means for you and how you can improve your security with WatchGuard today!

  • 8
  • 6
Tackle projects and never again get stuck behind a technical roadblock.
Join Now