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Enable server behind a Cisco 677 w/ NAT

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by rodeo 1 view

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Hi,
I have a Cisco 677 DSL router with NAT enabled. My problem is I have a Windows 2000 web server behind the DSL on my local network. When the router receives a request on port 80 I want it forwarded to the web server. I have changed the built in web interface in the Cisco 677 to use port 8080 and I have tried to add a manual NAT entry to the router using the SET NAT ENTRY ADD command. I have wrote the parameters to the router and rebooted it but it still will not forward the packets. Any help would be greatly appreciated.

5 replies

by 4u21der

I would assume that you are NOT running DHCP services for your LAN. If you are port mapping will fail everytime you reboot or expire the DHCP lease. Make sure the Win2k server has a static IP!

I have not worked with any of the DSL routers. Ciscohas a great page that deals with mapping ports.

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120t/120t5/iosfw2/iosfw2_3.htm#xtocid2852820

What happens when there is a request to port 80?

Make sure you are providing mapping in both directions and that there is mapping for both protocols (*TCP,UDP). Make sure there is mapping for both the LAN and WAN interfaces.

Not exactly an answer, but i hope it can point you in another direction.

Good Luck!

by estebandelatorre

Nothing strange has to be done here. If the cisco is natting, simply add a default gateway to the web server pointing to the lan adress of the cisco.
Remember that the request will be to an address first, in port 80. You have to make a static routefrom internet_ip_address to Web Server IP address and enable nat for all of the users but from other internet_ip_address

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