Sunos 5.8 Error:EDNS not supported by your namesever

Mark Andrews marka at
Wed Sep 5 07:11:13 UTC 2012

In message <CAJw6AQC1EApdkaz+7EF2kn5C7zgzAdWMxuk1BQdyRrGczOggiA at>, syed haq writes:
> Hi
> When I enter the query for the client in the RIPE DataBase for the Reverse
> DNS ,the Error getting is
> EDNS not supported by ***.**.**.**
>          EDNS is an extension to the DNS protocol. The major change
>          is that the 512-byte size limit of the query/answer packet has
>          been removed, which allows more information to be provided.
>          EDNS is essential for newer protocols and technologies (such
>          as DNSSEC and IPv6) that requires larger packet sizes.
> Please let me know what to do to resolve the issue

1)  Make sure your firewall passes EDNS packets both in and out.
2)  Run a nameserver that supports EDNS.

Since you are asking here, if you run BIND 9 (or a late BIND 8)
your nameserver supports EDNS.

Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at

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