More things to try: 1. Check that reverse DNS records point back correctly. 2. There are web sites to let you prob your DNS servers from a few dozens of servers around the world. Try using them to check availability. On Aug 11, 2012 12:28 AM, <li...@sbt.net.au> wrote:
> On Sat, August 11, 2012 12:04 am, Glen Turner wrote: > > 1) Verify operation by walk down the name server tree using dig > > Firstly, find the nameserver. You are following the tree down so the IP > > addresses come from the answers of the previous command: > > dig +norecurse ns au > > dig @58.65.254.73 +norecurse ns com.au > > dig @202.65.12.73 +norecurse ns dom.com.au > > dig a ns1.dnsimple.com 184.106.214.131 > > Now ask about the mail exchanger > > dig @184.106.214.131 +norecurse mx dom.com.au > > dig aspmx.l.google.com > > all OK > > > And connect to it > > telnet 209.85.225.26 mail QUIT > > from bigpond adsl 'telnet mail' doesn't but 'telnet 587' is OK > > > Do that for every server for dom.com.au to ensure that the answers are > > consistent. You might want to pull the SOAs to be sure the serial numbers > > are identical. > > yes > > > 2) Be clear about DNS forwarding versus DNS serving. > > I'm not sure how that fits in..? > I have mail server and three authoritative dns servers..? > I don't believe I have any DNS forwarding...? > > > They are not the same. This sort of issue is usually the result of > > confusing the two. > > > 3) Understand TTL and caching > > > Your changes do not take effect immediately and old configurations and > > errored configurations can be around for some time. > > Glen, thanks > > it all checks out when I test it from here, but, verizon tells me they > fail getting response from all three servers from their network > > AFAICT, I can't fault the setup, I was testing in a similar manner prior > to your email, using 'dig dom.tld +trace' to get delegation tree > > -- > SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ > Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html > -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
