フレッツ光クロスの場合は、プロバイダによっては動的なIPv4を振ってくれますが、限られたポート番号のみで80番とか433番とか普通のポート番号を使うことができません。フレッツ光クロスでは、今のようなPPPoEでの接続のように完全なIPv4を振ってくれません。現状のようにダイナミックDNSでサーバーを外に公開することができません。この辺りの説明はザックリしていますので、MAP-E、v6プラス、IPv4 over IPv6、transixのキーワードで正確な情報は各自調べてみてください。
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