asked on Clrify DNS Sequence
Have a wierd DNS behavoiur and wanted to check my understanding of the flow of DNS in MS DNS servers
In short it does check the root hints last
- A User types in address www.company.com.uk
- If the sites Server 2008 R2 server is the authoritative server it responds with the details
- If the sites Server isnt authoritative, it asks via the default gateway, the DNS server of the ISP
- If that isnt returned in time, it then queries the root hint server for that domain prefix alphanumeric c.root-ervers.net
In short it does check the root hints last
Microsoft Server OSDNS
Last Comment
mbkitmgr
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ASKER
Thanks to you all. I have a client who running SBS2011. is able to see any website locally (Australia) but only selected international ones. e.g. Twitter-yes, Facebook-No, Instagram-Yes, BBC.Com-No. There may be more but these are ones I am testing confident they aren't in the middle of an outage.
When I do an nslookup working my way up the food chain, and try to lookup one of the international domains that works all is good, when I try one that isnt working I get 'request timed out'. I wasn't sure of when or what the sequence forwarders are used vs root hints vs external DNS calls.
Since lodging this I called the ISP, they have others getting the same response
When I do an nslookup working my way up the food chain, and try to lookup one of the international domains that works all is good, when I try one that isnt working I get 'request timed out'. I wasn't sure of when or what the sequence forwarders are used vs root hints vs external DNS calls.
Since lodging this I called the ISP, they have others getting the same response
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ASKER
HI Jeremy, That's what I ended up doing I added 8.8.8.8 as a forwarder and all is now happy. The ISP has asked me to do some more tests later today for them. I'm keen to undertsand what the issue was.
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ASKER
Many thanks to all
1. Host sends request to local name server. (if its found the related request i.e the host on local it'll resolve to thats mac and sends the information to requester and comunication begins)
(if packet is related to internet or non local lan then)
2. Local name server sends request to root.
3. Root refers local name server to remote name server.
4. Local name server sends request to remote name server.
5. Remote name server replies to local name server.
6. Local name server replies to host.
all the best