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2011-07-29T11:06:05.850
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So, first off, how to use <code>host</code>. This is as good a tool as any for debugging DNS, only its output is much easier to read and understand than <code>dig</code> (both can do the same job). To query what your dns records look like at your end, do the following (with lenary.co.uk as an example): <pre><code>$ host lenary.co.uk lenary.co.uk has address 207.97.227.245 lenary.co.uk mail is handled by 20 ASPMX4.GOOGLEMAIL.COM. lenary.co.uk mail is handled by 20 ASPMX5.GOOGLEMAIL.COM. lenary.co.uk mail is handled by 0 aspmx.l.google.COM. lenary.co.uk mail is handled by 10 ALT1.aspmx.l.google.COM. lenary.co.uk mail is handled by 10 ALT2.aspmx.l.google.COM. lenary.co.uk mail is handled by 20 ASPMX2.GOOGLEMAIL.COM. lenary.co.uk mail is handled by 20 ASPMX3.GOOGLEMAIL.COM. </code></pre> This can help debug stuff. If you use a CNAME on the www subdomain it will tell you where it's aliased to. "has address" just means it's an A record. That's the first step. If it's working for you, now check a few major DNS servers around the world (you may have to research IPs/hostnames for them). To check at a specific server, do the following (I chose 8.8.8.8, a dns server run by google). I also specified the type of record i was looking for using <code>-t <type></code> so the output is less verbose. You probably want A for your main domain and CNAME for subdomains like "www". <pre><code>$ host -t A lenary.co.uk 8.8.8.8 Using domain server: Name: 8.8.8.8 Address: 8.8.8.8#53 Aliases: lenary.co.uk has address 207.97.227.245 </code></pre> That should allow you to check against enough servers to verify the information is correct.
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1. PODebugging DNS Issues
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1. USSam Elliott
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