Regarding EDNS0

[Minoru Asano]

Hello,

The customer would like to know regarding EDNS0

[ENVIRONMENT]
Tru64 UNIX V5.1A
BIND 9.2.3 which is included in Internet Express 6.3

[SITUATION]
He would like to set 512bytes as UDP packet for DNS query.
In another Operation System, it seems to be possible to set disable EDNS0.

[QUESTION]
- Can we set 512 bytes as UDP packet for DNS query at BIND 9.2.3 which is IX 6.3 ?
I guess that we can set "edns no" at option field.

Thank you for support and advice.
Best Regards.
/Minoru.Asano

[Al Licause]

v6.3 of IX is two versions old....the current version is V6.5 but I don't believe they have upgraded the bind distribution to anything later than 9.2.3.

Looking at the ISC bind site, it appears that even v9.2.X is fairly old. They list v9.3.2-P2 as the most current release.

I've only found one hit pairing EDNS0 and bind and it's in German. Doesn't appear to be something DNS implementers have yet adopted. You might be better off trying to query the ISC site directly to see if they do support EDNS0 and in which versions.

Good luck.

[Minoru Asano]

Hello,
Thank you for reply and suggestion.

To make sure, can I ask a question again ?

If we can set EDNS0 function at named.conf , does UDP packet send 512bytes only ?

The setting is like following:

server 11.22.33.44 {
edns no;
}

Thank you for advice.
Best Regards.
/Minoru.Asano

[Al Licause]

I have submitted a query to our group that maintains our bind distribution and will post the results if they do not post directly.

[Al Licause]

According to what I have been told by engineering, it is possible to disabled EDNS0 in this version of bind. Unfortunately they gave no further details.