NAT Configuration on a Cisco Router

[ssreckov]

idiot

[VictorButny]

Great video, i learned the part with "access-list" now! Thanks...:)

[enyawix]

What is "ip virtual-reassembly"? My router auto inserts this line on my interfaces.

[rickput]

ok i'm not a techy guy but when i play my game online and try to create a server, it says i'm on a private network and others wont be able to join me, is there an "easy" way to fix this?

[thimmarayasamy]

thanks



[asmae63]

thanks

[tro2a70]

wana  dynamic lab ccna plz nat dynamic example packet traiser

[Ralphied200]

howd you get that program?

[AceZero20]

that wasn't a program, it was an actual router connected through HyperTerminal. you can get a program called Packet Tracer to simulate this kind of stuff though.

[DeadSilence2009]

Hey, I have a motorola router from comcast and im trying to connect to xbox live it reads the router but will not read the IP connectivity anyone help me figure this problem out thanks

[zoltron30]

you can also tyep as an example:

ip nat inside source list 1 pool zoltron30 overload

[JoeyTribiane]

acl 1 should have the wildcard as 0.0.255.255 with 192.168.0.0

[Mortybf]

If you would like the 192.168.0.0/16 net, obviusly he did not want that and used the 0.0.0.255 mask.

He could use a 0.0.0.3 mask if he wanted just 2 host addresses.

What i'm trying to do is make the point that you can use any mask.

[Awantg]

@JoeyTribiane

why do you say that?... 3rd octect is network in this case..

[PsylencedMike]

@Awantg

You can use any wildcard mask in case of NATting for non-connected networks, or multiple networks spanning multiple interfaces.

Example:

The following could all be allowed through the NAT process using wildcard 192.168.0.0/16:

Fa0/0: 192.168.10.0/24

Fa0/1: 192.168.20.0/24

Fa1/1: 192.168.210.0/24

[JoeyTribiane]

@Awantg eeewps...I looked at this for about 3 seconds...I am sooo used to seeing 192.168.0.0/16, plus I just got done training a CCNA bootcamp, and I had to go back over CIDR and their masks (A=/8, B=/12, C=/16)

[yezidi11]

cool very cooooool

[RunBackNow]

is Cisco the same as Netcomm because i typed in Netcomm and this came up...i cnt find anything, any tips?

[kb8zxe]

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...

[westgatenetworks]

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!

[kb8zxe]

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!

[maze70]

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.

[JoeyTribiane]

ip nat inside source list bla int fa0/1 over

[Iwasblocked]

In your topology, you have fa0/1 connected to the cloud... I thought you can only use serial interfaces to a cloud...pls help...

[westgatenetworks]

The assumption is that there is a DSL or cable modem attached to the int fa0/1 interface.

[kwoaj]

excellent .. keep posting .. well aprreciated !!!