our isp not supports EDNS?

Lightner, Jeff jlightner at water.com
Tue May 4 12:26:39 UTC 2010

That's what makes this whole discussion so much fun.  There don't seem
to be any yes/no answers.

Based on my reading yesterday and consistent with our findings here it
seems the most likely issue is somewhere in the network path rather than
the name server itself.  You should check your internal
routers/switches/firewalls first.  

-----Original Message-----
From: bind-users-bounces+jlightner=water.com at lists.isc.org
[mailto:bind-users-bounces+jlightner=water.com at lists.isc.org] On Behalf
Of Mark Andrews
Sent: Tuesday, May 04, 2010 12:31 AM
To: Jeff Pang
Cc: bind-users at isc.org
Subject: Re: our isp not supports EDNS? 

In message
<y2sf7e964441005031927m7774769ev280156817d8b4d53 at mail.gmail.com>, Je
ff Pang writes:
> Hello,
> Following the discussions in the list, I made a test on one of our
> servers, which is in an ISP's datacenter.
> The result is below:
> $ dig +short rs.dns-oarc.net txt
> rst.x476.rs.dns-oarc.net.
> rst.x485.x476.rs.dns-oarc.net.
> rst.x490.x485.x476.rs.dns-oarc.net.
> " DNS reply size limit is at least 490"
> " lacks EDNS, defaults to 512"
> "Tested at 2010-05-04 02:23:51 UTC"
> Does this mean our ISP's filrewall block EDNS query/response?

Maybe / maybe not.  It could just mean that the nameserver itself
doesn't support EDNS.

> Thanks.
> _______________________________________________
> bind-users mailing list
> bind-users at lists.isc.org
> https://lists.isc.org/mailman/listinfo/bind-users
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org
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