Hi, David I work at Google Public DNS and will take a look at this issue. No RRSIG should be returned unless the client set the DO bit to ask for it. Thanks Yunhong On Thu, Nov 15, 2012 at 9:12 AM, MailPlus| David Hofstee <david@mailplus.nl> wrote:
Hi,
We've been seeing automatic RRSIG records on Google DNS lately, the 8.8.8.8 en 8.8.4.4. They are not always provided. They cause problems for some of our customers in a weird way I cannot explain. For them these records do not resolve but I cannot reproduce it.
So when I run dig command
dig @8.8.8.8 m1.mailplus.nl
it often provides the RRSIG record (but e.g. the TXT record will not be signed). I've heard that DNS may fall back to TCP and/or may be filtered by firewalls if UDP is over 512 bytes. However, the request is not that long, about 200 bytes if I interpret the answer correctly.
Can someone come up with a good explanation why a tiny percentage of our customers cannot resolve (some of) our domains?
Btw, our nameservers (transip.nl) only provide DNSSEC records if explicitly asked. What is standard here?
Thanks,
David Hofstee