DNS report for zone “e-exterior.net”
Hostmaster for zone e-exterior.net is: root@ns.toyama-smenet.or.jpIP settings (as seen from ns3.system-cobo.net)
error
You have less than 2 nameservers. You need to have at least 2 nameservers!
info
You have nameservers in several C-Nets, that's good!
Mail settings (as seen from ns3.system-cobo.net)
warn
You have only 1 mailserver. Consider getting a backup one!
Zone as seen from “ns2.system-cobo.net” [218.224.235.179]
info
ns2.system-cobo.net is running the latest version of the zone(2008072501).
info
SOA serial seems to follow good standards. We recommend it to be in YYYYMMDDxx-format, which yours appear to be. This would suggest that your zone was last updated at 2008-07-25, and has been updated 2 times on that day.
info
This nameserver does not allow zone transfers.
error
Your nameserver supports recursion. This is really bad to have activated on public nameservers since they can then be used for amplification of Denial Of Service attacks! You can find more information about it here: http://www.us-cert.gov/reading_room/DNS-recursion033006.pdf
info
Your nameserver responds to queries via TCP.
info
Your nameserver responds authorative for the zone.
info
Your SOA refresh value of 60 minutes is good.
info
Your SOA retry value of 60 minutes is good.
warn
A SOA expiry value of 3600000 is quite high. You should consider lowering this to a value inbetween 2 and 4 weeks. This value defines for how long the zone should be valid when the slaves are unable to reach the master.
warn
A minimum TTL (Time To Live) of 86400 is quite high. RFC2308 recommends a minimum TTL between 1-3 hours.
Zone as seen from “ns3.system-cobo.net” [210.227.92.166]
error
Host is not authorative!