our isp not supports EDNS?

[Mark Andrews]

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.
> "218.204.255.72 DNS reply size limit is at least 490"
> "218.204.255.72 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.
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org