1. 再帰検索

リゾルバー(名前解決のためのDNSサーバー）の動作を調べてみよう。

http://D/intro-dns.html DNSの動作

2. DNS キャッシュの動作 具体例

日頃お世話になっている tokai-ic.or.jp へメイルを出すとしたときの DNS キャッシュサーバの動作を追跡してみましょう。

ついでに DNS/reflection と [DNS/202.41.218.246 の逆引き]]も

見かけはこれだけのことですが、 

dnsqr mx tokai-ic.or.jp
15 tokai-ic.or.jp:
51 bytes, 1+1+0+0 records, response, noerror
query: 15 tokai-ic.or.jp
answer: tokai-ic.or.jp 39731 MX 0 mx.tokai-ic.or.jp

裏ではおお忙しです。 

@40000000443c5fd801a476ac starting
@40000000443c5feb1bab177c query 1 7f000001:73d8:a4b7 15 tokai-ic.or.jp.
@40000000443c5feb1babe684 tx 0 15 tokai-ic.or.jp. . c03a801e c0e44fc9 c620400c c0702404 c0cbe60a c021040c c1000e81 80080a5a 803f0235 ca0c1b21 c0249411 c00505f1 c6290004
@40000000443c5feb2ca6b3c4 rr c03a801e 172800 1 a.dns.jp. cb770101
@40000000443c5feb2ca73894 rr c03a801e 172800 1 b.dns.jp. ca0c1e83
@40000000443c5feb2ca79654 rr c03a801e 172800 1 d.dns.jp. d28aaff4
@40000000443c5feb2ca7f414 rr c03a801e 172800 1 e.dns.jp. c0322b35
@40000000443c5feb2ca84dec rr c03a801e 172800 1 f.dns.jp. 96640203
@40000000443c5feb2ca8b37c rr c03a801e 172800 ns jp. f.dns.jp.
@40000000443c5feb2ca8f9cc rr c03a801e 172800 ns jp. d.dns.jp.
@40000000443c5feb2ca9401c rr c03a801e 172800 ns jp. e.dns.jp.
@40000000443c5feb2ca9c4ec rr c03a801e 172800 ns jp. a.dns.jp.
@40000000443c5feb2caa0754 rr c03a801e 172800 ns jp. b.dns.jp.
@40000000443c5feb2caa68fc rr c03a801e 172800 28 a.dns.jp. 20010dc4000000000000000000000001
@40000000443c5feb2caacaa4 rr c03a801e 172800 28 d.dns.jp. 20010240000000000000000000000053
@40000000443c5feb2cab2c4c rr c03a801e 172800 28 e.dns.jp. 20010200000000010000000000000004
@40000000443c5feb2cab8624 rr c03a801e 172800 28 f.dns.jp. 200102f8000001000000000000000153
@40000000443c5feb2cabd444 stats 1 456 1 0

jp ドメインの NS サーバ(+A)が分った。 

@40000000443c5feb2cac458c cached 1 f.dns.jp.
@40000000443c5feb2cac9b7c cached 1 d.dns.jp.
@40000000443c5feb2caced84 cached 1 e.dns.jp.
@40000000443c5feb2cad3f8c cached 1 a.dns.jp.
@40000000443c5feb2cad9194 cached 1 b.dns.jp.
@40000000443c5feb2cadf33c tx 0 15 tokai-ic.or.jp. jp. 96640203 c0322b35 ca0c1e83 d28aaff4 cb770101
@40000000443c5feb2d180b64 rr 96640203 86400 1 ns.tokai-ic.or.jp. ca29daf6
@40000000443c5feb2d1878c4 rr 96640203 86400 ns tokai-ic.or.jp. ns.tokai-ic.or.jp.
@40000000443c5feb2d19cc9c rr 96640203 86400 ns tokai-ic.or.jp. ns2.reflec.to.
@40000000443c5feb2d19d854 stats 1 573 1 0

tokai-ic.or.jp の NS 名が分った。(一部は A レコードも)

A レコードが分らない ns2.reflec.to の検索が始まる。 (これがまた大騒ぎ； root サーバに問合せ) 

@40000000443c5feb2d19e024 cached 1 ns.tokai-ic.or.jp.
@40000000443c5feb2d19ebdc tx 1 1 ns2.reflec.to. . 80080a5a c1000e81 ca0c1b21 c620400c c6290004 c0249411 c021040c c0cbe60a c0702404 c0e44fc9 c03a801e c00505f1 803f0235
@40000000443c5feb386c38b4 rr 80080a5a 172800 1 colo.to. ce0ed69c
@40000000443c5feb386c9a5c rr 80080a5a 172800 1 tonic.to. ce0ed2eb
@40000000443c5feb386d2ae4 rr 80080a5a 172800 ns to. auth02.ns.uu.net.
@40000000443c5feb386d751c rr 80080a5a 172800 ns to. colo.to.
@40000000443c5feb386db784 rr 80080a5a 172800 ns to. dns.msen.com.
@40000000443c5feb386e01bc rr 80080a5a 172800 ns to. ns1.iafrica.com.
@40000000443c5feb386e4424 rr 80080a5a 172800 ns to. tonic.to.
@40000000443c5feb386e8a74 rr 80080a5a 172800 ns to. ns-to.ripe.net.
@40000000443c5feb386ed894 stats 1 754 1 0

to の NS レコードが分った。

今度は auth02.ns.uu.net. の A レコードの番だ。 

@40000000443c5feb386f6d04 tx 2 1 auth02.ns.uu.net. . 803f0235 c0cbe60a c0249411 c0e44fc9 c0702404 c00505f1 c620400c c6290004 c03a801e 80080a5a ca0c1b21 c021040c c1000e81
@40000000443c5fec082a918c rr 803f0235 172800 1 a.gtld-servers.net. c005061e
@40000000443c5fec082afeec rr 803f0235 172800 1 b.gtld-servers.net. c0210e1e
@40000000443c5fec082b5cac rr 803f0235 172800 1 c.gtld-servers.net. c01a5c1e
@40000000443c5fec082bbe54 rr 803f0235 172800 1 d.gtld-servers.net. c01f501e
@40000000443c5fec082c1c14 rr 803f0235 172800 1 e.gtld-servers.net. c00c5e1e
@40000000443c5fec082c7dbc rr 803f0235 172800 1 f.gtld-servers.net. c023331e
@40000000443c5fec082cdf64 rr 803f0235 172800 1 g.gtld-servers.net. c02a5d1e
@40000000443c5fec082d3d24 rr 803f0235 172800 1 h.gtld-servers.net. c036701e
@40000000443c5fec082d9ecc rr 803f0235 172800 1 i.gtld-servers.net. c02bac1e
@40000000443c5fec082dfc8c rr 803f0235 172800 1 j.gtld-servers.net. c0304f1e
@40000000443c5fec082e5e34 rr 803f0235 172800 1 k.gtld-servers.net. c034b21e
@40000000443c5fec082ebfdc rr 803f0235 172800 1 l.gtld-servers.net. c029a21e
@40000000443c5fec082f1d9c rr 803f0235 172800 1 m.gtld-servers.net. c037531e
@40000000443c5fec082f96b4 rr 803f0235 172800 ns net. a.gtld-servers.net.
@40000000443c5fec082fe0ec rr 803f0235 172800 ns net. g.gtld-servers.net.
@40000000443c5fec08302b24 rr 803f0235 172800 ns net. h.gtld-servers.net.
@40000000443c5fec08307174 rr 803f0235 172800 ns net. c.gtld-servers.net.
@40000000443c5fec0830b7c4 rr 803f0235 172800 ns net. i.gtld-servers.net.
@40000000443c5fec0830fe14 rr 803f0235 172800 ns net. b.gtld-servers.net.
@40000000443c5fec0831484c rr 803f0235 172800 ns net. d.gtld-servers.net.
@40000000443c5fec08318e9c rr 803f0235 172800 ns net. l.gtld-servers.net.
@40000000443c5fec0831d4ec rr 803f0235 172800 ns net. f.gtld-servers.net.
@40000000443c5fec08321b3c rr 803f0235 172800 ns net. j.gtld-servers.net.
@40000000443c5fec0832618c rr 803f0235 172800 ns net. k.gtld-servers.net.
@40000000443c5fec0832abc4 rr 803f0235 172800 ns net. e.gtld-servers.net.
@40000000443c5fec0832f214 rr 803f0235 172800 ns net. m.gtld-servers.net.
@40000000443c5fec08334fd4 rr 803f0235 172800 28 a.gtld-servers.net. 20010503a83e00000000000000020030
@40000000443c5fec083474cc stats 1 1699 1 0

net の NS レコードが判明した。 

@40000000443c5fec08350d24 cached 1 a.gtld-servers.net.
@40000000443c5fec08355f2c cached 1 g.gtld-servers.net.
@40000000443c5fec0835b134 cached 1 h.gtld-servers.net.
@40000000443c5fec08360724 cached 1 c.gtld-servers.net.
@40000000443c5fec0836592c cached 1 i.gtld-servers.net.
@40000000443c5fec0836ab34 cached 1 b.gtld-servers.net.
@40000000443c5fec08370124 cached 1 d.gtld-servers.net.
@40000000443c5fec0837532c cached 1 l.gtld-servers.net.
@40000000443c5fec0837a91c cached 1 f.gtld-servers.net.
@40000000443c5fec0837fb24 cached 1 j.gtld-servers.net.
@40000000443c5fec08384d2c cached 1 k.gtld-servers.net.
@40000000443c5fec0838a31c cached 1 e.gtld-servers.net.
@40000000443c5fec0838f524 cached 1 m.gtld-servers.net.
@40000000443c5fec08395e9c tx 2 1 auth02.ns.uu.net. net. c0304f1e c005061e c037531e c02bac1e c0210e1e c02a5d1e c01f501e c00c5e1e c01a5c1e c023331e c029a21e c034b21e c036701e
@40000000443c5fec089e3aec rr c0304f1e 172800 1 auth00.ns.uu.net. c6060141
@40000000443c5fec089ea464 rr c0304f1e 172800 1 auth02.ns.uu.net. c6060152
@40000000443c5fec089f060c rr c0304f1e 172800 1 auth60.ns.uu.net. c60601b5
@40000000443c5fec089f67b4 rr c0304f1e 172800 1 auth200.ns.uu.net. c3810c52
@40000000443c5fec089fc574 rr c0304f1e 172800 1 auth210.ns.uu.net. c3810c4a
@40000000443c5fec08a02b04 rr c0304f1e 172800 ns uu.net. auth00.ns.uu.net.
@40000000443c5fec08a07154 rr c0304f1e 172800 ns uu.net. auth200.ns.uu.net.
@40000000443c5fec08a0b7a4 rr c0304f1e 172800 ns uu.net. auth210.ns.uu.net.
@40000000443c5fec08a0fdf4 rr c0304f1e 172800 ns uu.net. auth60.ns.uu.net.
@40000000443c5fec08a14c14 stats 1 2025 1 0

ここはキャッシュにあるものが使えた。

次は dns.msen.com. か、やれやれ。 

@40000000443c5fec08a1a5ec cached 1 colo.to.
@40000000443c5fec08a21b1c tx 2 1 dns.msen.com. . c00505f1 c620400c c0702404 c0249411 c0cbe60a c6290004 ca0c1b21 c021040c 80080a5a c0e44fc9 c1000e81 803f0235 c03a801e
@40000000443c5fec13d5e374 rr c00505f1 172800 ns com. a.gtld-servers.net.
@40000000443c5fec13d6357c rr c00505f1 172800 ns com. b.gtld-servers.net.
@40000000443c5fec13d67bcc rr c00505f1 172800 ns com. c.gtld-servers.net.
@40000000443c5fec13d7009c rr c00505f1 172800 ns com. d.gtld-servers.net.
@40000000443c5fec13d746ec rr c00505f1 172800 ns com. e.gtld-servers.net.
@40000000443c5fec13d78d3c rr c00505f1 172800 ns com. f.gtld-servers.net.
@40000000443c5fec13d7d38c rr c00505f1 172800 ns com. g.gtld-servers.net.
@40000000443c5fec13d819dc rr c00505f1 172800 ns com. h.gtld-servers.net.
@40000000443c5fec13d8602c rr c00505f1 172800 ns com. i.gtld-servers.net.
@40000000443c5fec13d8a67c rr c00505f1 172800 ns com. j.gtld-servers.net.
@40000000443c5fec13d8eccc rr c00505f1 172800 ns com. k.gtld-servers.net.
@40000000443c5fec13d9331c rr c00505f1 172800 ns com. l.gtld-servers.net.
@40000000443c5fec13d9796c rr c00505f1 172800 ns com. m.gtld-servers.net.
@40000000443c5fec13d9defc rr c00505f1 172800 28 a.gtld-servers.net. 20010503a83e00000000000000020030
@40000000443c5fec13da3cbc rr c00505f1 172800 28 b.gtld-servers.net. 20010503231d00000000000000020030
@40000000443c5fec13da8adc stats 1 2432 1 0

ここはキャッシュにあるのが使える。 

@40000000443c5fec13db2334 cached 1 a.gtld-servers.net.
@40000000443c5fec13db753c cached 1 b.gtld-servers.net.
@40000000443c5fec13dbcb2c cached 1 c.gtld-servers.net.
@40000000443c5fec13dc1d34 cached 1 d.gtld-servers.net.
@40000000443c5fec13dc6f3c cached 1 e.gtld-servers.net.
@40000000443c5fec13dcc52c cached 1 f.gtld-servers.net.
@40000000443c5fec13dd1734 cached 1 g.gtld-servers.net.
@40000000443c5fec13dd6d24 cached 1 h.gtld-servers.net.
@40000000443c5fec13ddbf2c cached 1 i.gtld-servers.net.
@40000000443c5fec13de1134 cached 1 j.gtld-servers.net.
@40000000443c5fec13de6724 cached 1 k.gtld-servers.net.
@40000000443c5fec13deb92c cached 1 l.gtld-servers.net.
@40000000443c5fec13df0f1c cached 1 m.gtld-servers.net.
@40000000443c5fec13df7894 tx 2 1 dns.msen.com. com. c023331e c01a5c1e c034b21e c00c5e1e c01f501e c02a5d1e c02bac1e c029a21e c005061e c0210e1e c036701e c037531e c0304f1e
@40000000443c5fec1b57decc rr c023331e 172800 1 dns.msen.com. 943b130b
@40000000443c5fec1b582cec rr c023331e 172800 1 dns.msen.com. 943b130b
@40000000443c5fec1b58add4 rr c023331e 172800 1 dns1.msen.com. 943b0e0c
@40000000443c5fec1b590b94 rr c023331e 172800 1 dns2.msen.com. c6164143
@40000000443c5fec1b596954 rr c023331e 172800 ns msen.com. dns.msen.com.
@40000000443c5fec1b59b38c rr c023331e 172800 ns msen.com. dns1.msen.com.
@40000000443c5fec1b59f9dc rr c023331e 172800 ns msen.com. dns2.msen.com.
@40000000443c5fec1b5a47fc stats 1 2634 1 0

ns1.iafrica.com. の A レコードも調べておこう。 

@40000000443c5fec1b5ac114 tx 2 1 ns1.iafrica.com. . 80080a5a c021040c c0702404 c0cbe60a c00505f1 c1000e81 c0249411 c03a801e c6290004 c0e44fc9 c620400c 803f0235 ca0c1b21
@40000000443c5fec26b2363c rr 80080a5a 172800 ns com. a.gtld-servers.net.
@40000000443c5fec26b2845c rr 80080a5a 172800 ns com. g.gtld-servers.net.
@40000000443c5fec26b2ce94 rr 80080a5a 172800 ns com. h.gtld-servers.net.
@40000000443c5fec26b310fc rr 80080a5a 172800 ns com. c.gtld-servers.net.
@40000000443c5fec26b3574c rr 80080a5a 172800 ns com. i.gtld-servers.net.
@40000000443c5fec26b3a184 rr 80080a5a 172800 ns com. b.gtld-servers.net.
@40000000443c5fec26b3e3ec rr 80080a5a 172800 ns com. d.gtld-servers.net.
@40000000443c5fec26b42e24 rr 80080a5a 172800 ns com. l.gtld-servers.net.
@40000000443c5fec26b4708c rr 80080a5a 172800 ns com. f.gtld-servers.net.
@40000000443c5fec26b4bac4 rr 80080a5a 172800 ns com. j.gtld-servers.net.
@40000000443c5fec26b4fd2c rr 80080a5a 172800 ns com. k.gtld-servers.net.
@40000000443c5fec26b54764 rr 80080a5a 172800 ns com. e.gtld-servers.net.
@40000000443c5fec26b58db4 rr 80080a5a 172800 ns com. m.gtld-servers.net.
@40000000443c5fec26b5eb74 rr 80080a5a 172800 28 a.gtld-servers.net. 20010503a83e00000000000000020030
@40000000443c5fec26b63994 stats 1 2981 1 0

@40000000443c5fec26b6d1ec cached 1 a.gtld-servers.net.
@40000000443c5fec26b723f4 cached 1 g.gtld-servers.net.
@40000000443c5fec26b779e4 cached 1 h.gtld-servers.net.
@40000000443c5fec26b7cbec cached 1 c.gtld-servers.net.
@40000000443c5fec26b821dc cached 1 i.gtld-servers.net.
@40000000443c5fec26b873e4 cached 1 b.gtld-servers.net.
@40000000443c5fec26b8c9d4 cached 1 d.gtld-servers.net.
@40000000443c5fec26b93b1c cached 1 l.gtld-servers.net.
@40000000443c5fec26b9910c cached 1 f.gtld-servers.net.
@40000000443c5fec26b9e314 cached 1 j.gtld-servers.net.
@40000000443c5fec26ba3904 cached 1 k.gtld-servers.net.
@40000000443c5fec26ba8ef4 cached 1 e.gtld-servers.net.
@40000000443c5fec26bae4e4 cached 1 m.gtld-servers.net.
@40000000443c5fec26bb4e5c tx 2 1 ns1.iafrica.com. com. c0304f1e c02a5d1e c036701e c01a5c1e c023331e c00c5e1e c005061e c029a21e c02bac1e c034b21e c0210e1e c01f501e c037531e
@40000000443c5fec2745b40c rr c0304f1e 172800 1 ns1.iafrica.com. c407008b
@40000000443c5fec2746022c rr c0304f1e 172800 1 ns1.iafrica.com. c407008b
@40000000443c5fec27465fec rr c0304f1e 172800 1 ns2.iafrica.com. c4078e85
@40000000443c5fec2746c194 rr c0304f1e 172800 ns iafrica.com. ns1.iafrica.com.
@40000000443c5fec27470bcc rr c0304f1e 172800 ns iafrica.com. ns2.iafrica.com.
@40000000443c5fec2747521c rr c0304f1e 172800 ns iafrica.com. rip.psg.com.
@40000000443c5fec2747a03c stats 1 3153 1 0

えー、ns-to.ripe.net も調べるの。 

@40000000443c5fec2747f62c cached 1 tonic.to.
@40000000443c5fec27486b5c tx 2 1 ns-to.ripe.net. . c00505f1 c0702404 c0249411 ca0c1b21 c1000e81 c620400c 80080a5a c6290004 c021040c c03a801e c0e44fc9 803f0235 c0cbe60a
@40000000443c5fec328474fc rr c00505f1 172800 1 a.gtld-servers.net. c005061e
@40000000443c5fec3284de74 rr c00505f1 172800 1 b.gtld-servers.net. c0210e1e
@40000000443c5fec3285401c rr c00505f1 172800 1 c.gtld-servers.net. c01a5c1e
@40000000443c5fec32859ddc rr c00505f1 172800 1 d.gtld-servers.net. c01f501e
@40000000443c5fec3285fb9c rr c00505f1 172800 1 e.gtld-servers.net. c00c5e1e
@40000000443c5fec32865d44 rr c00505f1 172800 1 f.gtld-servers.net. c023331e
@40000000443c5fec3286bb04 rr c00505f1 172800 1 g.gtld-servers.net. c02a5d1e
@40000000443c5fec32871cac rr c00505f1 172800 1 h.gtld-servers.net. c036701e
@40000000443c5fec32877a6c rr c00505f1 172800 1 i.gtld-servers.net. c02bac1e
@40000000443c5fec3287dc14 rr c00505f1 172800 1 j.gtld-servers.net. c0304f1e
@40000000443c5fec328839d4 rr c00505f1 172800 1 k.gtld-servers.net. c034b21e
@40000000443c5fec3288babc rr c00505f1 172800 1 l.gtld-servers.net. c029a21e
@40000000443c5fec328937bc rr c00505f1 172800 ns net. e.gtld-servers.net.
@40000000443c5fec32897e0c rr c00505f1 172800 ns net. f.gtld-servers.net.
@40000000443c5fec3289c45c rr c00505f1 172800 ns net. g.gtld-servers.net.
@40000000443c5fec328a0aac rr c00505f1 172800 ns net. h.gtld-servers.net.
@40000000443c5fec328a50fc rr c00505f1 172800 ns net. i.gtld-servers.net.
@40000000443c5fec328a974c rr c00505f1 172800 ns net. j.gtld-servers.net.
@40000000443c5fec328ae184 rr c00505f1 172800 ns net. k.gtld-servers.net.
@40000000443c5fec328b27d4 rr c00505f1 172800 ns net. l.gtld-servers.net.
@40000000443c5fec328b6e24 rr c00505f1 172800 ns net. m.gtld-servers.net.
@40000000443c5fec328bb474 rr c00505f1 172800 ns net. a.gtld-servers.net.
@40000000443c5fec328bfac4 rr c00505f1 172800 ns net. b.gtld-servers.net.
@40000000443c5fec328c4114 rr c00505f1 172800 ns net. c.gtld-servers.net.
@40000000443c5fec328c8764 rr c00505f1 172800 ns net. d.gtld-servers.net.
@40000000443c5fec328ce90c rr c00505f1 172800 28 a.gtld-servers.net. 20010503a83e00000000000000020030
@40000000443c5fec328d4ab4 rr c00505f1 172800 28 b.gtld-servers.net. 20010503231d00000000000000020030
@40000000443c5fec328d98d4 stats 1 4112 1 0

@40000000443c5fec328e2d44 cached 1 e.gtld-servers.net.
@40000000443c5fec328e8334 cached 1 f.gtld-servers.net.
@40000000443c5fec328ed924 cached 1 g.gtld-servers.net.
@40000000443c5fec328f2b2c cached 1 h.gtld-servers.net.
@40000000443c5fec328f811c cached 1 i.gtld-servers.net.
@40000000443c5fec328fd324 cached 1 j.gtld-servers.net.
@40000000443c5fec32902914 cached 1 k.gtld-servers.net.
@40000000443c5fec32907b1c cached 1 l.gtld-servers.net.
@40000000443c5fec3290d10c cached 1 m.gtld-servers.net.
@40000000443c5fec329126fc cached 1 a.gtld-servers.net.
@40000000443c5fec32917cec cached 1 b.gtld-servers.net.
@40000000443c5fec3291cef4 cached 1 c.gtld-servers.net.
@40000000443c5fec329224e4 cached 1 d.gtld-servers.net.
@40000000443c5fec32928e5c tx 2 1 ns-to.ripe.net. net. c037531e c02bac1e c0304f1e c01a5c1e c01f501e c034b21e c02a5d1e c0210e1e c029a21e c005061e c00c5e1e c023331e c036701e
@40000000443c5fec373aec74 rr c037531e 172800 1 ns-to.ripe.net. c1000ce0
@40000000443c5fec373b55ec rr c037531e 172800 1 ns-pri.ripe.net. c10000c3
@40000000443c5fec373bbf64 rr c037531e 172800 ns ripe.net. ns-ext.isc.org.
@40000000443c5fec373c099c rr c037531e 172800 ns ripe.net. ns-pri.ripe.net.
@40000000443c5fec373c4c04 rr c037531e 172800 ns ripe.net. ns3.nic.fr.
@40000000443c5fec373c963c rr c037531e 172800 ns ripe.net. sec3.apnic.net.
@40000000443c5fec373cdc8c rr c037531e 172800 ns ripe.net. sunic.sunet.se.
@40000000443c5fec373d3a4c rr c037531e 172800 28 sec3.apnic.net. 20010dc0000100004777000000000140
@40000000443c5fec373d886c stats 1 4362 1 0

やっと、ns2.reflec.to の A レコードを検索する準備完了。 

@40000000443c5fec373df1e4 tx 1 1 ns2.reflec.to. to. ce0ed69c ce0ed2eb c1000ce0 c6060152 c407008b 943b130b
@40000000443c5fed0208a334 rr ce0ed69c 86400 1 ns.reflec.to. ca29dae2
@40000000443c5fed02090cac rr ce0ed69c 86400 1 ns2.reflec.to. d2a13992
@40000000443c5fed020952fc rr ce0ed69c 86400 1 ns2.reflec.to. d2a13992
@40000000443c5fed0209acd4 rr ce0ed69c 86400 1 ns3.reflec.to. ca29dae5
@40000000443c5fed020a0e7c rr ce0ed69c 86400 ns reflec.to. ns.reflec.to.
@40000000443c5fed020a54cc rr ce0ed69c 86400 ns reflec.to. ns2.reflec.to.
@40000000443c5fed020a9b1c rr ce0ed69c 86400 ns reflec.to. ns3.reflec.to.
@40000000443c5fed020ae93c stats 1 4565 1 0

ここまでやらんでもよさそうだが。

これでやっと、tokai-ic.or.jp の NS とその A レコードが揃ったので、 MX の問合せができる。 

@40000000443c5fed020b4ecc tx 0 15 tokai-ic.or.jp. tokai-ic.or.jp. d2a13992 ca29daf6
@40000000443c5fed031b0d34 rr d2a13992 86400 1 mx.tokai-ic.or.jp. ca29daf6
@40000000443c5fed031b76ac rr d2a13992 259200 1 ns.tokai-ic.or.jp. ca29daf6
@40000000443c5fed031bdc3c rr d2a13992 259200 ns tokai-ic.or.jp. ns2.reflec.to.
@40000000443c5fed031c2674 rr d2a13992 259200 ns tokai-ic.or.jp. ns.tokai-ic.or.jp.
@40000000443c5fed031c881c rr d2a13992 86400 mx tokai-ic.or.jp. 0 mx.tokai-ic.or.jp.
@40000000443c5fed031cd63c stats 1 4786 1 0
@40000000443c5fed031d8dd4 sent 1 51

やれやれ。おつかれさま。