NAT and Multiple IP Help

[anthonymeluso]

This is just a general question but I have 8 static IPs that I can use.

What I don't get is that my router's WAN port IP is a totally different network from the static IPs that I can use. How does this work?

If I disable NAT on my router can I just assign that ip address to a computer's network card? What should I put in as the default gateway? The WAN address or something else.

Is my WAN address being NATed into 8 other public ip addresses?

Really confused here how this works.

Thanks,
Anthony

 

[leedsit]

Hi,

if Im interperating this correctly, You have 8 static addresses in series that are internet addresses, and you also have another internet address for the outside of your router.

So you have 2 Options, with all options you still have your single address on your router interface (outside interface ) then one of the following options

Option 1, you configure an inside interface with one of the 8 statics, then any other equipment must have a unique address from one of the 8 available. using the inside interface as your Default gateway

Option 2, you configure an inside interface with a personal inside scheme, such as 192.168.x.x then Nat any addresses going out behind your outside physical interface.

does this sound like what your after???

The reason your WAN port is a totally different address is because your router is a layer 3 device, hence the networks (subnet ) must be different.



LEEroy
MCNE6,CCNA2,CWNA, Project+

 

[JOAMON]

Sounds like your ISP furnished you a router and you have a static 8 block of internet routeable addresses. Even though it is called an 8 block the customer usually only has five useable to him. The reason is that one IP is the network address and one the broadcast address (neither useable) and the first one is typically used on the side facing the customer.
Below is an example of what an isp might provide to a customer for a new internet connection. What the isp refers to as the lan is actually your wan. Typically you would then connect this to your own router which would then use the 2nd ip routeable address on the outside interface and the inside interface would then be your private lan address.

Local WAN IP: 64.122.187.186
Remote WAN IP (Gateway): 64.122.187.185
WAN Subnet Mask: 255.255.255.252

LAN Subnet: 64.122.187.192
LAN Subnet Mask: 255.255.255.248
Number of Useable IP’s 5
Ethernet Interface IP (Gateway IP for LAN): 64.122.187.193
Range of IP available for assignment: 64.122.187.194 thru .198

 

[anthonymeluso]

Thanks a lot guys. I'm pretty sure I understand now.

With this no NAT setup I should configure my internal interface with one of the public IP addresses and have the other public IP addresses configured to my servers, using the router's internal interface as their default gateway.

I will be assigning all these addresses to the external interface on my ISA 2004 server and then configuring web publishing rules.