Ciscoルータをもっているなら、Anyconnect を使ってみてもいいのだけれども、OS標準（Android/Apple iOS含む）でVPNを張れる環境にしたいのでSoftEtherで構築した。
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! WAN側は CBAC を使う ip inspect name CBAC-WAN-OUT tcp ip inspect name CBAC-WAN-OUT udp router-traffic ip inspect name CBAC-WAN-OUT icmp router-traffic ! PPPoE を喋るインターフェイス interface GigabitEthernet0/5 description to ONU no ip address duplex auto speed auto pppoe enable group global pppoe-client dial-pool-number 1 ! ! 内側のネットワーク interface Vlan100 description Inner Network ip address 192.168.0.1 255.255.255.0 ip nat inside ip virtual-reassembly in ip tcp adjust-mss 1414 ! PPPoE (Dialer) interface Dialer1 mtu 1454 ip address negotiated ip access-group WAN-IN in ip nat outside ip virtual-reassembly in encapsulation ppp ip tcp adjust-mss 1414 dialer pool 1 dialer-group 1 ppp authentication chap callin ppp chap hostname ＜ほげほげ＞ ppp chap password 7 ＜ふがふが＞ no cdp enable ! NAT ip dns server ip nat inside source list 1 interface Dialer1 overload ip nat inside source static udp 192.168.0.3 4500 interface Dialer1 4500 ip nat inside source static esp 192.168.0.3 interface Dialer1 ip nat inside source static udp 192.168.0.3 500 interface Dialer1 500 ip route 0.0.0.0 0.0.0.0 Dialer1 ! WANインターフェイスのアクセスリスト ip access-list extended WAN-IN permit udp any eq domain any permit icmp any any echo-reply permit udp any any eq isakmp permit udp any any eq non500-isakmp permit esp any any deny ip any any log ! ! Dialer と NAPTの設定 dialer-list 1 protocol ip permit access-list 1 permit 192.168.0.0 0.0.255.255
