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As5300 NAT Option Available ?

Posted on 2002-06-17
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Last Modified: 2006-11-17
Hey All,
Is there a NAT option in as5300 router ??? i don`t happen to see it? I am using ver 12.0

Please tell me where i can find please ? and some tips on configuring it.
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Question by:peterh1975
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Expert Comment

by:mikecr
ID: 7083429
On the outside or internet interface you would use the command:

ip nat outside

On your inside ethernet interface you would use the command:

ip nat inside

You would then use the command similar to this:

ip nat inside source list 1 interface Serial0/0.1 overload

This command points to an access list, source list 1, which might look like this:

access-list 1 permit 10.5.0.0 0.0.255.255

All traffice going from network 10.5.0.0 will be natted as it goes out the serial interface to the internet. The overload command at the end is utilized if you have more than one machine that your going to nat.
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Author Comment

by:peterh1975
ID: 7084090
Thnxs for the reply Mike.
If i wanted to make a nat on the ethernet itself i would type this.
config term
interface eth0
ip nat outside ??? are does it have to be on a serial interface ? sorry i am at work so i cannot see my router as yet.
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Expert Comment

by:mikecr
ID: 7087580
The interface that is directly connected to your LAN will have the ip nat inside command on it. The interface on your router that connects to the WAN portion of your network will have the ip nat outside command on it. This shows nat where the ip is coming from and going to. Using an access list you would permit your network of 10.5.0.0 to be able to go to the internet just like the statement I used above. Then the ios knows from where the ip traffic is coming that is to be natted, and what network is supposed to be natted as it goes thru. And finally the ip nat source list command is used to point to the access list that has the network that is to be natted. When an IP packet comes thru, the ios measures it against the access list criteria and if it is valid it gets natted.
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Author Comment

by:peterh1975
ID: 7090052
Thnxs Mike,
Can you possibly show me a script ? sorry i am a newbie.
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Expert Comment

by:mikecr
ID: 7090087
config t

int e0/0
ip nat inside

exit

int s0/0
ip nat outside

exit

access-list 1 permit ip 10.5.0.0

ip nat inside source list 1 interface Serial0/0 overload

exit

That should pretty much do it.

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Author Comment

by:peterh1975
ID: 7090107
Thnxs mike,
I`ll give it a shot tonite. I`ll reply tonite and give you the info. BTW can i pm you ?
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Expert Comment

by:mikecr
ID: 7090262
I'm probably a little dense here but what does pm mean? If it's like IM, normally all conversations need to go on within the EE group and they frown on outside conversing.
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Author Comment

by:peterh1975
ID: 7090313
Hey Mike,
Private Message email that is. BTW i try find the nat last nite on the as5300 with the sho ip nat translation and it said command not found ??
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Accepted Solution

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mikecr earned 100 total points
ID: 7090740
If that is correct then your version of IOS does not contain the NAT software. You may need to upgrade to a different version. What version is currently on the router? You can do this by doing a show version.
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Author Comment

by:peterh1975
ID: 7090788
Thnxs fro the reply Mike. Thats why i ask if i can email you for what i can go about getting the firmware update ? i don`t have account with Cisco?
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Expert Comment

by:mikecr
ID: 7090849
Unfortunately you would need to get an account to be able to update the software and get the correct IOS version. This is out of the scope of our ability here.
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Author Comment

by:peterh1975
ID: 7090952
Hey Mike,
I remember my password and i will download the 12.2 from cisco site, i thought it was expired but i guess not. I will let you know by tonite, thank you.
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Author Comment

by:peterh1975
ID: 7091588
Awesome, upgraded to 12.2 a. it works!!!
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Expert Comment

by:mikecr
ID: 7092320
Okay sir, if there is anything esle that we can do for you, please stop back.
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