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IPv4/v6 環境での SMTP 

%size 4
山本和彦
WIDE プロジェクト
v6@wide.ad.jp

%font "typewriter"
http://www.v6.wide.ad.jp/
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IPv4/v6 環境の SMTP に向けて

	IPv4/v6 MTAs -- パッチはすでにある
	IPv4/v6 MUAs -- だいたい OK (pop6)

DNS データベースの
%cont, font "typewriter"
"IN AAAA" 
%cont, font "standard"
レコードは、古き良き MTAs/DNS サーバにどのような影響を与えるか？

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実験

	以下のアドレスにテスト・メールを送ってもらうよう呼びかけた。

%size 3
To: test@a.v6.wide.ad.jp
To: test@b.v6.wide.ad.jp

%font "typewriter", size 3
a.v6.wide.ad.jp. IN A 203.178.137.73
a.v6.wide.ad.jp. IN AAAA 3ffe:0501:1000::1

b.v6.wide.ad.jp. IN MX 10 c.v6.wide.ad.jp.
b.v6.wide.ad.jp. IN MX 20 a.v4.wide.ad.jp.

c.v6.wide.ad.jp. IN AAAA 3ffe:0501:1000::1
c.v4.wide.ad.jp. IN A 203.178.137.73

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結果

	1256 のサブドメインから 1380 のメールが送られてきた。
		33 通は正しくない From: フィールドを持っていた。

	"MX loopback to myself" エラーが 2 通
		(送り主の設定ミス？)
	"no route to host" エラーが 1 通
		(古いネームサーバ - 4.8.3 - のせい)

	AAAA がうまく取り扱えないソフトウェア
		x.x.x 以前の Sendmail
		x.x.x 以前の bind

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これからなにをすべきか？

	問題の周知徹底
		古いソフトウェアをバージョンアップしてもらう
		ドニュメントを書く

	安全のために、v6 用のドメインを分ける
		v6.wide.ad.jp