NAT Configuration on a Cisco Router
This is a tutorial that shows how to configure network address translation (NAT) on a Cisco router. For additional videos and white papers from West Gate Networks, please visit http://www.westgatenetworks.com/whitepapers.html
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you can also tyep as an example:
ip nat inside source list 1 pool zoltron30 overload
acl 1 should have the wildcard as 0.0.255.255 with 192.168.0.0
ip nat inside source list bla int fa0/1 over
cool very cooooool
is Cisco the same as Netcomm because i typed in Netcomm and this came up…i cnt find anything, any tips?
You shouldn’t have to “double NAT” anything, you either let the DSL modem/router do it or the Cisco, one or the other. The best thing to do is turn the DSL router into bridge mode, let it do the PPP negotiation for you and set the Cisco fa0/1 for dynamic. The dynamic or static IP addressing has nothing to do with the performance of the NAT, as your interface needs an ip address before the NAT will work at all.
I just found that out. However, I found out that it works well if you do set a static IP and then double nat everything (once in the Cisco and once in the DSL modem since most dsl lines require pppoe). The part that was throwing me for a loop was configuring an IP route for internet traffic. I finally found this command ( ip route 0.0.0.0 0.0.0.0 192.168.1.1 ) and now it all works. Thanks for the posts, they are a great help with trying to get my CCNA!
The assumption is that there is a DSL or cable modem attached to the int fa0/1 interface.
If your 1601’s are running IOS 12.1T or above, they should have a command to dynamically assign an IP to an interface. So instead of assigning a static IP on int fa0/1, you just do these commands:
int fa0/1
ip address dhcp
Your Interface will then pick up a dynamic address from your ISP and NAT will run without problems even when the interface address changes. I hope this helps!
Nice example, but, how would you do this with a dynamic ip address. I have a network consisting of a few 1601’s (using VLSM) and I would like to add internet to them. I have a dsl modem that will hand out a public IP but it always changes. All the NAT example that I see use a fixed IP, how would it be different for dynamic? Thanks…
In your topology, you have fa0/1 connected to the cloud… I thought you can only use serial interfaces to a cloud…pls help…
excellent .. keep posting .. well aprreciated !!!