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Replies

Failing with simplest NAT config ever

guitar007
Level 1
Level 1

I am using a Cisco 1921 with Gig0/0 and Gig0/1 interfaces on it.  I'm trying to do something really simple, however it isn't working at all and I feel I must be overlooking something very basic.

 

ip cef

no ip source-route

ip classless

!

interface GigabitEthernet0/0

  desc private internet

  ip address 192.168.116.1 255.255.255.0

  ip nat inside

  no ip virtual-reassembly

  speed 1000

  duplex full

  no mop enabled

!

interface GigabitEthernet0/1

  desc public internet  

  ip address x.x.x.244 255.255.255.240

  ip nat outside

  no ip virtual-reassembly

  speed 1000

  duplex full

!

ip nat inside source list 2 interface GigabitEthernet0/0 overload

ip route 0.0.0.0 0.0.0.0 x.x.x.241

!

access-list 2 permit 192.168.0.0 0.0.255.255

 

Packets in 192.168.116.0/24 get to Gig0/0 but don't get translated to go out onto the internet, so a ping to an address on the open internet fails but I can ping the .241 gateway. I turned on debug ip nat but it isn't showing anything useful. Any ideas on what I am overlooking?

 

Thanks,

CJ

1 Accepted Solution

Accepted Solutions

balaji.bandi
Hall of Fame
Hall of Fame

try this

 

config t

!

no ip nat inside source list 2 interface GigabitEthernet0/0 overload

ip nat inside source list 2 interface GigabitEthernet0/1 overload

!

end

 

 

BB

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4 Replies 4

guitar007
Level 1
Level 1

To clarify, I should have said:

 

"Packets in 192.168.116.0/24 get to Gig0/0 but don't get translated to go out onto the internet, so a ping to an address on the open internet fails. From the router, I can ping the .241 gateway."

 

CJ

balaji.bandi
Hall of Fame
Hall of Fame

try this

 

config t

!

no ip nat inside source list 2 interface GigabitEthernet0/0 overload

ip nat inside source list 2 interface GigabitEthernet0/1 overload

!

end

 

 

BB

***** Rate All Helpful Responses *****

How to Ask The Cisco Community for Help

asimGurung
Level 1
Level 1

Hi, maybe you could change the command "ip nat inside source list 2 interface GigabitEthernet0/0 overload" to use GigabitEthernet0/1 (the one pointing to the outside network) instead.

 

 

 

Thanks, I could swear I tried that!  I can't believe I made sych a simple mistake. Thanks for the assistance.

 

CJ

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