DNSの逆引きはなぜ遅いのかDNS <minmin@jprs.co.jp> 2005/7/29 JANOG16@ 2005/7/29 DNS 2 ? • ssh(telnet) – telnet SMTP • ftp anonymous 1 2 • DNS • DNS ? 2005/7/29 DNS 3 ? • LAME ( ) – DNS ( ) … – DNS – – etc... • LAME – 2005/7/29 DNS 4 • IP 0.20.30.40 – DNS 40.30.20.10.in-addr.arpa. PTR RR – • 2 DNS • 2005/7/29 DNS 5 • DNS ns.example.jp • ? – DNS DNS – BIND 8(BIND 4 ) 2005/7/29 DNS 6 BIND 8( BIND 4) (1/2) • – www.example.jp A
