Cisco DSL ルータの設定とトラブルシューティング ガイド - 単一の固定 IP アドレスによる RFC1483 ルーティング

!--- Comments contain explanations and additional information.service timestamps debug datetime msecservice timestamps log datetime msecip subnet-zero!!--- For DHCP:ip dhcp excluded-address <ip address of ethernet0>ip dhcp pool <dhcp pool name> network <ip network address of ethernet0> <subnet mask> default-router <ip address of ethernet0> dns-server <ip address of dns server>!interface ethernet0 no shut ip address <ip address> <subnet mask> ip nat inside no ip directed-broadcast!interface atm0 no shut no ip address no ip directed-broadcast no atm ilmi-keepalive!interface atm0.1 point-to-point ip address <ip address> <subnet mask>!--- For NAT: ip nat outside pvc <vpi/vci>  encapsulation aal5snap !--- Common PVC values supported by ISPs are 0/35 or 8/35. !--- Confirm your PVC values with your ISP. !!!--- For NAT:ip nat inside source list 1 interface atm0.1 overload!--- If you have a pool (a range) of public IP addresses provided !--- by your ISP, you can use a NAT Pool. Replace !--- ip nat inside source list 1 interface atm0.1 overload   !--- with these two configuration statements: !--- ip nat inside source list 1 pool <nat pool name> overload !--- ip nat pool <nat pool name> <first ip address> <last ip address>  !--- netmask <subnet mask> !--- If Internet users require access to an internal server, you can !--- add this static NAT configuration statement: !--- ip nat inside source static tcp <inside ip address of server> {80 or 25} !--- <outside well-known ip address of server> {80 or 25} extendable !--- Note: TCP port 80 (HTTP/web) and TCP port 25 (SMTP/mail) are used !--- for this example. You can open other TCP or UDP ports, if needed.! ip classless ip route 0.0.0.0 0.0.0.0 <default gateway to isp>!--- For NAT:access-list 1 permit <ip network address of ethernet0> <wildcard mask>!--- In this configuration, access-list 1 defines a standard access list !--- that permits the addresses that NAT translates. For example, if !--- your private IP network is 10.10.10.0, configure !--- access-list 1 permit 10.10.10.0 0.0.0.255 in order to allow NAT to translate !--- packets with source addresses between 10.10.10.0 and 10.10.10.255.!end