yamaha接続例（ブリッジ式）：
ip routing on
ip lan2 address 192.168.3.22/24
ip route default gateway 192.168.3.1
ipsec auto refresh on
ipsec transport 1 101 udp 1701
tunnel select 1
tunnel encapsulation l2tpv3
tunnel endpoint address 117.122.180.50
tunnel endpoint name 8.8.8.8 fqdn
ipsec tunnel 101
ipsec sa policy 101 1 esp aes-cbc sha-hmac
ipsec ike restrict-dangling-sa 1 off
ipsec ike nat-traversal 1 on keepalive=30 force=off
ipsec ike keepalive log 1 on
ipsec ike keepalive use 1 on dpd 10 6 0
ipsec ike pre-shared-key 1 text vpn
ipsec ike local name 1 YAMAHA1_ID fqdn
ipsec ike duration isakmp-sa 1 691200 rekey 90%
ipsec ike duration ipsec-sa 1 691200 rekey 90%
ipsec ike remote address 1 117.122.180.50
ipsec ike remote address 1 8.8.8.8
l2tp always-on on
l2tp tunnel disconnect time off
l2tp keepalive use on 5 10
l2tp keepalive log on
l2tp syslog on
l2tp remote end-id vpn
tunnel enable 1
ip bridge1 address 10.255.255.253/22
heartbeat2 myname keepalive
heartbeat2 transmit 1 auth keepalive 10.255.255.255
heartbeat2 transmit interval 30
heartbeat2 transmit enable 1