Technical issues on NAT

[Mohamed Kabeer S]

Hi all,

I am kabeer,I have configured Cisco 1841 router PAT buts its not worked please find the below configuration details,

In LAN  interface

Interface gigabit Ethernet 0/0

no shutdown

Ip address 192.168.1.1 255.255.255.0

Ip nat inside

Exit

In wan interface

Interface gigabit Ethernet 0/1

No shutdown

Ip address 202.100.x.x 255.255.x.x

Ip nat outside

Exit

Access-list 1 permit 192.168.1.0 0.0.0.255

Ip nat inside source list 1 interface gigabit Ethernet 0/1 overload

Similarly I have configured static and dynamic nat but its not works in my customer place.

So kindly provide the solution for this issue.

Thanks and Regards,

Kabeer

[Bilal Nawaz]

Asalaam Kabeer, I think the problem is that maybe your IP address on your WAN interface and your static route is incorrect.

When you plug your laptop in, is it in dhcp client mode? When you do ipconfig what information do you see on the laptop?

If DHCP is enabled on the laptop, that means we need to enable DHCP on the router instead of static ip configuration and static default route.

On your WAN interface

Conf t
Interface fa0/1
IP address DHCP
!
No ip route 0.0.0.0 0.0.0.0 202.200.x.x

You should let your router pick up address automatically if this is the case.
Please confirm this.

Hope this helps

Sent from Cisco Technical Support iPhone App

[hmukite34]

Config looks great. How about you create a pool of one:

ip nat pool NET 202.100.x.x 202.100.x.x netmask 255.255.x.x
ip nat inside source list 1 pool NET overload

[Bilal Nawaz]

Why would you need a nat pool for the WAN? This still won't work if the IP address of the interface is wrong and also the default route.

The NAT statement is fine

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[moncy_cisco]

Hi,

Your nat configuration is fine.in access list better to use extended acl, check the outside ip address from the isp and make sure you have the connectivity to the gateway of the isp and the internet . When you ping from the router your source should be outside ip of the router. If it’s working try to ping outside any public ip from the source of inside ip of the router. If ping not reaching gateway from the outside ip then check with isp.

If you are able to ping any public ip using inside ip of the router , again internet is not working for the users then configure dns.

Config ex.

Int f0/0

Ip nat inside

Int f0/1

Ip nat outside

access-list 110 permit ip any any

ip nat inside source list 110 interface f0/1 overload

ip route 0.0.0.0 0.0.0.0 f0/1

ip name-server x.x.dnsip.x

static nat :

ip nat inside source static tcp x.x.insideip.x 3389 interface f0/1 3389

Regadrs,