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Something's screwy on our network at work, and I'm no longer able to reach a server where I'm developing a database application. I'm not the network admin, and he's out sick.

When, from my workstation, I ping the server on which SQL Server instance lives:

  ping server6

this is the reply:

Pinging SERVER6 [fe80::6579:d35e:3471:f21c%11]

Why is there no IP address as there normally is? Is this an IPv6 address, and if so, why am I seeing it?

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Yes. That is an IPV6 address and you are seeing it presumably because that's the address your machine found for that server when it queried DNS for the name. –  Etan Reisner Jul 31 '13 at 15:20
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Yes, this is an IPv6 address. You're seeing this because ping will always display the IPv6 address for a host before the IPv4 one, if it has one. To see the IPv4 address, use:

ping -4 server6

(Assuming you are using Windows. It certainly looks like it.)

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Not always. There are several rules that the OS uses to order IP addresses, defined in RFC 6724. For example, Teredo-tunnelled IPv6 (2001:0::/32) has lower priority than IPv4 (::ffff:0:0/96). –  grawity Jul 31 '13 at 15:25
    
@grawity Feel free to edit my answer as you probably know more about the subject than me :) –  toryan Jul 31 '13 at 15:27
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