Router#sh conf
　　Using 1306 out of 8061 bytes
　　!
　　version 12.0
　　no service pad
　　service timestamps debug uptime
　　service timestamps log uptime
　　no service password-encryption
　　service udp-small-servers
　　service tcp-small-servers
　　!
　　hostname Router
　　!
　　!
　　ip subnet-zero
　　ip dhcp excluded-address 172.16.240.1 172.16.240.10
　　ip dhcp excluded-address 172.16.240.201 172.16.240.254
　　!
　　ip dhcp pool flink
　　network 172.16.240.0 255.255.255.0
　　default-router 172.16.240.254
　　domain-name ns3.bta.net.cn
　　dns-server 202.106.196.115 202.106.0.20
　　!
　　no ip domain-lookup
　　!
　　!
　　process-max-time 200
　　!
　　interface Ethernet0
　　ip address 172.16.241.254 255.255.255.0 secondary
　　ip address 172.16.242.254 255.255.255.0 secondary
　　ip address 172.16.243.254 255.255.255.0 secondary
　　ip address 172.16.244.254 255.255.255.0 secondary
　　ip address 172.16.240.254 255.255.255.0
　　no ip directed-broadcast
　　ip nat inside
　　!
　　interface Serial0
　　ip address 192.168.108.22 255.255.255.252
　　no ip directed-broadcast
　　ip nat outside
　　!
　　ip nat pool gj 210.72.225.88 210.72.225.95 netmask 255.255.255.248
　　ip nat inside source list 1 pool gj overload
　　ip nat inside source static n
　　no ip http server
　　ip route 0.0.0.0 0.0.0.0 192.168.108.21
　　!
　　access-list 1 permit 172.16.240.0 0.0.0.255
　　!
　　line con 0
　　transport input none
　　stopbits 1
　　line vty 0 4
　　login