Router Cisco 1841

use este script e adapte para a sua necessidade como range de ip.

Current configuration : 4525 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname (seu hostname)
!
boot-start-marker
boot-end-marker
!
enable password cisco
!
no aaa new-model
ip cef
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
 ip address 7.7.7.254 255.255.255.0
 ip access-group 100 in
 ip nat inside
 duplex auto
 speed auto
!
interface FastEthernet0/1
 ip address dhcp
 ip nat outside
 duplex auto
 speed auto
!
interface Serial0/0/0
 no ip address
 shutdown
 clock rate 2000000
!
!
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
ip nat pool (seu pool name ) 192.168.0.100 192.168.0.107 netmask 255.255.255.0
ip nat pool (pool name) 192.168.254.1 192.168.254.254 netmask 255.255.255.0
ip nat inside source list 1 pool (pool name)
!
access-list 1 permit 7.7.7.0 0.0.0.255
access-list 100 permit tcp 7.7.7.0 0.0.0.255 any
access-list 100 deny   udp 192.168.0.0 0.0.0.255 any eq 23
access-list 100 deny   icmp 192.168.0.0 0.0.0.255 any
access-list 100 permit ip any any
!
!
control-plane
!
!
banner exec ^CCC              
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*                                                                             *                                                                              
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*                                                                                          

*y                             ===============                                *                                                                              
*                                                                             *                                                                              
               *                                                                              
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*******************************************************************************                                                                              
^C
banner motd ^CCCC               
###########################################################################                                                                          
#             ACESSO PERMITIDO SOMENTE A PESSOAS AUTORIZADAS              #                                                                          
#                                                                         #                                                                          
#            TODAS AS CONEXOES ESTAO SENDO MONITORADAS E AUDITADAS        #                                                                          
#                                                                         #                                                                          
#                   ATTENTION: AUTHORIZED PERSONAL ONLY.                  #                                                                          
#                                                                         #                                                                          
#                          DISCONNECT IMMEDIATELY.                                                                  
#                                                                         #                                                                          
#                      DSREDE SUPPORT INFO E TELECOM                      #                                                                          
###########################################################################
^C
!
line con 0
line aux 0
line vty 0 4
 password cisco
 login
!
scheduler allocate 20000 1000
end