拠点①／hoge.aa0.netvolante.jp で DDNS 登録済み
tunnel select 1
ipsec tunnel 1
ipsec sa policy 1 1 esp 3des-cbc sha-hmac
ipsec ike keepalive use 1 on
ipsec ike local address 1 192.168.0.1
ipsec ike pre-shared-key 1 *
ipsec ike remote address 1 any
ipsec ike remote name 1 kyoten2
ip tunnel mtu 1280
ip tunnel tcp mss limit auto
tunnel enable 1

拠点②
tunnel select 1
ipsec tunnel 1
ipsec sa policy 1 1 esp 3des-cbc sha-hmac
ipsec ike keepalive use 1 on
ipsec ike local address 1 192.168.1.1
ipsec ike local name 1 kyoten2
ipsec ike pre-shared-key 1 *
ipsec ike remote address 1 hoge.aa0.netvolante.jp
ip tunnel mtu 1280
ip tunnel tcp mss limit auto
tunnel enable 1


この状態で 拠点② の syslog debug on したログみたら
[IKE] no such domain name hoge.aa0.netvolante.jp

と。nslookup hoge.aa0.netvolante.jp は正しいIPを返します。
もぅさっぱり・・・・