I have a problem with NAT in my Cisco router 831. My network topology looks like this: I have a router 831, in ethernet 0 is connected my main switch (cisco 2950), in ethernet 1 is connect my isp modem, and in ethernet 2 (DMZ zone) is connected another 2950 switch, with a webserver connected to it.
When I access my router through SDM, I try to add an address translation rule (NAT, Edit NAT Configuration, Add), to be able to access the webserver from WAN. The IP of the webserver is 172.25.4.10/16. These are the entries when I add the rule to the NAT config:
Direction: from outside to inside
Outside interface: Ethernet 1
IP Address: ***.***.***.*** (my ISP address)
Inside interfaces: Ethernet0,Ethernet2
IP Address: 172.25.4.10 (webserver)
TCP(original port:80-translated port:80)
Now I click OK, and the problem occurs. The webserver is now unreachable. His IP Address is now 0.0.0.0 and I get this error in taskbar: LAN is unavailable. Windows cannot connect to a network at this time. Please update your network address.
When I try to force the NIC to use 172.25.4.10 in tcp-ip properties, it gets me the following error: The static IP address that was just configured is already in use on the network. Please reconfigure a different IP address.
It seems like the router is assigning the IP somewhere and I cannot use it anymore.
I made some research on this forum and on google, but I didn't found any answers to my problem. I recently upgraded my IOS to the latest version. Can anyone help me out on this please?
I am starting with Cisco products, and I still have some interogations and confusions about DMZ with NAT and PAT. Can someone clear me up with these terms: Static NAT, Dynamic NAT, Pool NAT, NAT overload, extendable, PAT, etc.. and if it is prefered to work with NAT in SDM or CLI?
I will try that command in SDM and give you guys a follow-up!
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