Sunos 5.8 Error:EDNS not supported by your namesever

Stephane Bortzmeyer bortzmeyer at
Wed Sep 5 07:17:00 UTC 2012

On Wed, Sep 05, 2012 at 10:01:45AM +0300,
 syed haq <smuh99 at> wrote 
 a message of 66 lines which said:

> EDNS not supported by ***.**.**.**

1) Test your name server to be sure the diagnostic is correct:


You should get in the answer something like:

; EDNS: version: 0, flags:; udp: 4096

(To test with a non-EDNS name server, 'dig +bufsize=4096 SOA' and with a EDNS name server 'dig +bufsize=4096
SOA fr' so you can see the difference)

2) BIND supports EDNS for so long that everyone forget when it was
included. So, it is unlikely it is the fault of your name server. If
your name server does not support EDNS, it probably means there is a
broken middlebox (firewall or something like that: most are configured
by ignorants, specially when it comes to the DNS) that you have to

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