DHCP Problem when NAT is Enable

[AlexBar76]

Hi,

I've a trouble on a simple configuration.

I need to connect a cisco c1111 router with a modem tooway, 

the cisco have the gigabiteth under dhcp and need to acquire the address from the tooway

from the other side I have some clients that need to access to internet and also the cisco c1111 made a tunnel gre on another site for a private connection

no problem even i insert the nat rule on cisco so this stop to acquire the address from DHCP 

if i remove the nat rule this start to work again and take the ip from tooway dhcp

but i need the nat for the internet connetcion for the clients 

Any solution ?? 

Thanks a lot

Alessandro

[balaji.bandi]

I believe you need to exempt the IP range from NAT exemption.Can you post the configuration show run from the device . and explain where is the DHCP Server and remote VPN address?

[AlexBar76]

Hi

Thanks, this is the configuration, i've put a note on the ip nat 

do not see the tunnel because i'm not already made firs i need to solve the DHCP problem 

many thanks for you help

A

[Georg Pauwen · Accepted solution]

Hello,

the problem is most likely that the access list (197) used for NAT has 'permit ip any any' configured, which does not work for NAT.

Change the access list to:

ip access-list extended 197
10 permit ip 10.0.0.0 0.0.255.255 any
20 permit udp any any eq bootpc

[AlexBar76]

Many thanks

Yes now the DHCP aquire without problems

I Have also modify the defaul route in this way

ip route 0.0.0.0 0.0.0.0 gigabitethernet0/0/1 dhcp

Many thanks for you support

regards

Alessandro 

[balaji.bandi]

i may be late here, glad to know all working by removing that ACL, thank you.