Need help knowing how to NAT

blake69 · Joined: Sep 30, 2004 Posts: 45

I have a Cisco 2600 router and I’m using an AT&T 2wire router.

What I’m trying to do is connect the Cisco to the 2wire. Then connect the Cisco to a black hawk switch to set up a lab in hopes of completing MCSE. After doing a basic configuration of the router here is what I have done so far base on information I found on the internet.

overload a single Internet IP address. Since this is the only IP address we have, we'll create a pool with only one IP address in it

determine who the router allows to use NAT to access the Internet using our NAT pool, which we can accomplish by creating an access list

connect the pool and the list of users. We can accomplish this by telling the router that we want to use NAT from the inside (using the access list to define our possible source IP addresses) and go to the outside using the pool that contains our single Internet IP address. In addition, we want to overload this single Internet IP address using PAT.

tell the router to send any traffic it doesn't know what to do with to the ISP (i.e., the Internet). In other words, we need to configure a default route to the ISP.

ip route 0.0.0.0 0.0.0.0 1.1.1.2

statically configure the PC's IP address, subnet mask, default gateway, and DNS servers. Of course, the IP address should be in the 192.168.1.2 to 254 range, and the subnet mask should be 255.255.255.0. The default gateway should match the router's LAN IP address—in this case, 192.168.1.1

after doing all of that all I can do is successfully ping the router. Where did I go wrong

Baby_Tux · Joined: Mar 06, 2007 Posts: 1242

What you are trying to do is very confusing to try to follow but it appears that you are dividing up your access into groups the turning around & combining them back again. WHY?

If I follow you, you have ONE outside address from the ISP
You want to divide the internal into separate groups & give all access to the outside WITHOUT access to each other or limited access to each other (WHICH?)

Also, are you trying to use IPv6?

Am I following you? If not, please clarify.

blake69 · Joined: Sep 30, 2004 Posts: 45

Thank you, for your patience and I’m sorry for the confusion. I its confusing because I’m confused. I’m basically trying to build a separate network off the 2wire with the cisco router. I overheard how one guy had did it at work and had a network separate from one the rest of the house hold was using. So I did some research and put gather a way to do it but it does not work. Here is the link that I used to get to where I’m. Also I’m not using IPV6.

http://articles.techrepublic.com.com/5100-10878_11-5596835.html?tag=rbxccnbtr1#

Baby_Tux · Joined: Mar 06, 2007 Posts: 1242

OK - 1st lets try to make some sense out of all this:

BTW: quite frankly, until now, I've NEVER heard of overloading (at least NOT the way it is said in the link) & what THEY are portraying is as clear as MUD so, I'd forget it - for now.

Lets see if this is what you are after;

ISP (IP address of ISP)
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2WIRE ROUTER (subnet 1)------------- PC's - group one (all have an address of subnet one) (may need hub or switch depending on number of PC's)
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CISCO ROUTER (subnet 2)
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SWITCH (really not needed if amount of PC's are less than or equal to number of ports)
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PC's - group two (all have an address of subnet 2)

Groups one in no way is to see group two - is this what you are after? - We will clarify & go from there.

blake69 · Joined: Sep 30, 2004 Posts: 45

Yes, Yes, that is it, that is it excalty.

Baby_Tux · Joined: Mar 06, 2007 Posts: 1242

blake69 · Joined: Sep 30, 2004 Posts: 45

Many, Thanks, I cant wait to give it a try. And I will let you know how it turns out.