Figure 23-1 shows the network topology for the PAT configuration that follows using the commands covered in this chapter.
router>en | |
router#config t | |
router(config)#host ISP | Sets host name |
ISP(config)#no ip domain-lookup | Turns off DNS resolution to avoid wait time due to DNS lookup of spelling errors |
ISP(config)#enable secret cisco | Sets encrypted password |
ISP(config)#line con 0 | |
ISP(config-line)#login | |
ISP(config-line)#password class | Sets console line password to class |
ISP(config-line)#logging synchronous | Commands will be appended to a new line |
ISP(config-line)#exit | |
ISP(config)#int s 0/1 | |
ISP(config-if)#ip address 199.85.64.6 255.255.255.252 | Assigns IP address |
ISP(config-if)#clockrate 56000 | Assigns clock rate to data communications equipment (DCE) cable on this side of link |
ISP(config-if)#no shut | |
ISP(config-if)#int lo0 | Creates loopback interface 0 |
ISP(config-if)#ip address 200.200.200.1 255.255.255.255 | Assigns IP address |
ISP(config-if)#exit | |
ISP(config)#exit | |
ISP#copy run start | Saves config to NVRAM |
router>en | |
router#config t | |
router(config)#host Company | Sets host name |
Company(config)#no ip domain-lookup | Turns off DNS resolution to avoid wait time due to DNS lookup of spelling errors |
Company(config)#enable secret cisco | Sets secret password |
Company(config)#line con 0 | |
Company(config-line)#login | |
Company(config-line)#password class | Sets console line password to class |
Company(config-line)#logging synchronous | Commands will be appended to a new line |
Company(config-line)#exit | |
Company(config)#int fa 0/0 | |
Company(config-if)#ip address 172.16.10.1 255.255.255.0 | |
Company(config-if)#no shut | |
Company(config-if)#int s0/0 | |
Company(config-if)#ip add 199.85.64.5 255.255.255.252 | |
Company(config-if)#no shut | |
Company(config-if)#exit | |
Company(config)#ip route 0.0.0.0 0.0.0.0 199.85.64.6 | Sends all packets not defined in the routing table to the ISP router |
Company(config)#access-list 1 permit 172.16.10.0 0.0.0.255 | Defines which addresses are permitted throughthese addresses are those that will be allowed to be translated with NAT |
Company(config)#ip nat inside source list 1 int s 0/0 overload | Creates NAT by combining List 1 with the interface S0/0. Overloading will take place |
Company(config)#int fa 0/0 | |
Company(config-if)#ip nat inside | Location of private inside addresses |
Company(config-if)#int s 0/0 | |
Company(config-if)#ip nat outside | Location of public outside addresses |
Company(config-if)# | |
Company#copy run start | |
