DNS entry is "::1"

Posted on 2011-10-22
Last Modified: 2012-05-12
I was looking at a prospect's SBS 2008 server and the DNS entries (IPCONFIG /ALL) wer the following:

I have never seen the entry: ":1" as a DNS entry. Nor have I seen the loopback address as an entry.  The last entry is the router address.

Can someone please enlighten me on the logic behind these entries?

Question by:beyondt
    LVL 16

    Accepted Solution

    ::1 is the IPv6 loopback address. It is the IPv6 equivalent of
    LVL 50

    Assisted Solution

    by:Don Johnston
    Looks like you missed a ":".

    In an IPv6 address contiguous 0's can be represented by ::. So an address of FC80:0000:0000:0000:0000:000:0000:0001 can be expressed as FC80::1.

    The address of ::1 (or 0000:0000:0000:0000:0000:0000:0000:0001) is the IPv6 loopback address.

    Author Comment

    So is it acceptable to have the DNS point to the Loopback addresses and the Router address?  Are there advantages to this as opposed to having it point to the SBS machince address?
    LVL 17

    Assisted Solution

    The router address should not be in there. It should only point to itself.

    Author Closing Comment

    Thanks for all three of the answers.  They cleared this up for me.

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