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Are there limitations in Windows Server 2012 Essentials R2?


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No problem Pete

 

DNS Console , right-click the name of your server in the Left-hand pane and select Properties from the contextual menu which appears.

Click on the Forwarders Tab

Click on Edit then enter the IP address of the DNS forwarder you want to add - if all is well the server will resolve this to a name, repeat to add as many forwarders as you want.

Click OK, make sure that the check-box to use root hints if none of your forwarders are available is selected and that should do it.

 

Reverse DNS lookup is the inverse of the normal way of doing things - you start with an IP address and lookup the host name associated with it. A common use for this is in email servers where it might check that the IP address that a message is coming from matches the reverse DNS lookup address for that domain - if it doesn't then it is possible that the address has been 'spoofed' and the likelihood is that the message is spam (or worse) and then the server can be configured to reject the message. You really don't need to bother setting this up or configuring it in a home network but the way to works is like this. 

 

You have a device on 192.168.1.1, your subnet mask is 255.255.255.0 and combining these we can tell that your network address is 192.168.1.0 and on this network your can have a maximum of 256 devices (actually you can't, you can only have 254 as two of the possible numbers are reserved). The subnet mask is the way in which the IP address is divided up between the network address part and the host address part.

 

So if we want a reverse DNS zone for this network, it is called (according to convention) the network address in reverse order.in-addr.arpa which in this example would be

 

0.1.168.192.in-addr.arpa  (INverse-ADDRess.Address and Routing Parameter Area) - don't ask! However the leading zero is usually dropped giving us a zone name of 1.168.192.in-addr.arpa

 

Yes I know it all sounds really counterintuitive and complex but a lot of it dates back to the early days of the internet and the way that it is structured. If you can get your head around the way that network addressing works and can visualise the binary representations then it does start to make a bit of sense.

 

John

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I agree about not setting reverse addressing checking; I've seen too many instances where people can't legitimate email to work properly because the destination server thinks the sender is bogus.

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