Domain unresolved in Singapore
Stephane Bortzmeyer
bortzmeyer at nic.fr
Tue Feb 19 08:43:40 UTC 2008
On Tue, Feb 19, 2008 at 03:30:48PM +0700,
Kadek Hendra Lesmana <ikadek at gmail.com> wrote
a message of 10 lines which said:
> Why this address is unresolved in Singapore but it's okay in Germany?
> I checked with DNS Report from DNS-Stuff and no error, only some
> warning.
Bad tools, use another tool.
Zonecheck (http://www.zonecheck.fr/) clearly indicates the problem:
only two name servers and probably in the same room, which means that
any network glitch will prevent name resolution. Use more diverse name servers.
w> IP addresses are likely to be all on the same subnet
| Adv: ZoneCheck
| To avoid loosing all connectivity with the authoritative DNS in case
| of network outage it is advised to host the DNS on different networks.
|
| Ref: IETF RFC2182 (Abstract)
| The Domain Name System requires that multiple servers exist for every
| delegated domain (zone). This document discusses the selection of
| secondary servers for DNS zones. Both the physical and topological
| location of each server are material considerations when selecting
| secondary servers. The number of servers appropriate for a zone is also
| discussed, and some general secondary server maintenance issues
| considered.
`----- -- -- - - -
: All the servers are likely to be on the subnet 222.124.211.224/28,
: try moving some of them to another subnet.
`..... .. .. . . .
=> generic
w> Nameservers are all part of the same AS
| Adv: ZoneCheck
| To avoid loosing all connectivity with the authoritative DNS in case
| of a routing problem inside your Autonomous System, it is advised to
| host the DNS on different AS.
`----- -- -- - - -
: All the nameservers are part of the same Autonomous System (AS number
: 17974), try to have some of them hosted on another AS.
`..... .. .. . . .
=> generic
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