Thank you, for your reply, sure here are the configurations used in the lab:
192.168.11.1 (gateway+dns server)
192.168.11.200 (router with the problem)
Current configuration : 1833 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname techno-router
!
boot-start-marker
boot-end-marker
!
enable secret 5 adsfads
enable password 7 dasfasdf
!
no aaa new-model
no network-clock-participate slot 1
no network-clock-participate wic 0
ip cef
!
ip name-server 192.168.11.1
!
!
interface FastEthernet0/0
ip address 192.168.11.200 255.255.255.0
ip access-group 110 in
ip nat outside
ip virtual-reassembly
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.57.1 255.255.255.0
ip nat inside
ip virtual-reassembly
duplex auto
speed auto
!
no ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 192.168.11.1
!
ip dns server
!
no ip http server
no ip http secure-server
ip nat pool nat-pool 192.168.11.200 192.168.11.200 netmask 255.255.255.0
ip nat inside source list 10 pool nat-pool overload
ip nat inside source static tcp 192.168.57.171 53 192.168.11.200 53 extendable
ip nat inside source static udp 192.168.57.171 53 192.168.11.200 53 extendable
!
access-list 10 permit 192.168.57.0 0.0.0.255
access-list 110 deny tcp any 192.168.11.0 0.0.0.255 eq telnet
access-list 110 deny icmp any 192.168.11.0 0.0.0.255 8 0
access-list 110 permit ip any any
!
!
!
control-plane
!
line con 0
password 7 dasf
login
speed 115200
line aux 0
password 7 adsf
login
line vty 0 4
password 7 adsf
login
!
!
end
