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If it's specifically a /31 as opposed to a /30 (i.e. with only 2 addresses instead of the 4 normally required), then the usual term is a /31 (slash thirty one). If it's just a subnet used for a point-to-point link, which happens to be a /31 because your equipment supports it, but could be a /30 in other cases, then "point-to-point network", "...


At former employer we'd have called this a "slash thirty-one" which saved two IPs over having to use a /30. Nominally a /31 should not work, because the network and broadcast address take one IP each, leaving none for useful addressing. There were some items of customer equipment that couldn't handle it, so we had to use (or waste) a second /31 ...


A /31 is most often used for creating a point to point link between two networks, since it can do so by only using two addresses. Hence the name, 'linknet' You can read this RFC for more information.


It appears as though the local DNS server isn't listening on IPv6. Right-click on the server in the list on the left in DNS Server, select properties and on the Interfaces tab ensure that the server's local IPv6 address is checked or that All IP Addresses radio button is selected. If the IPv6 address or All IP Addresses is already selected, I'd check ...


You should definitely NOT use a public DNS server. It can't possibly know about you Domain Controllers and which is the right server to ask anything about your domain.


I suggest changing the clients, not the DNS server. clients usually ask for DNS entries by requesting A and/or AAAA records. there is a sorting algorithm to prefer V6 over V4 if there are both answers from DNS. every connection is effectively made by the clients. to prefer IPv4 over V6 so can set precedence ::ffff:0:0/96 100 in /etc/gai.conf on every ...

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