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Earlier this week I've noticed some issues on my network. For example when I ping my machine (from my machine) using the hostname (or FQDN), I see a response from an IPv6 address.

C:\Windows\system32>ping nyl000 Pinging NYL000.domain.com [fe80::65fd:46bd:c2a3:435%35] with 32 bytes of data: Reply from fe80::65fd:46bd:c2a3:435%35: time<1ms Reply from fe80::65fd:46bd:c2a3:435%35: time<1ms Reply from fe80::65fd:46bd:c2a3:435%35: time<1ms Reply from fe80::65fd:46bd:c2a3:435%35: time<1ms

IPv6 is disabled on my workstation.

When I ping my machine from a different workstation I get an IPv4 address as a response.

C:\Documents and Settings\administrator.MECHONET>ping nyl000

Pinging nyl000.domain.com [10.1.100.95] with 32 bytes of data:

Reply from 10.1.100.95: bytes=32 time<1ms TTL=125 Reply from 10.1.100.95: bytes=32 time<1ms TTL=125 Reply from 10.1.100.95: bytes=32 time<1ms TTL=125 Reply from 10.1.100.95: bytes=32 time<1ms TTL=125

I have two DCs (2003 and 2008 R2) acting as DNS servers for this domain and IPv6 is disabled on both.

Strangely enough, in dnsmgmt on my DC i see 7 AAAA records for servers on my domain. All of these servers have the TCP/IPv6 checkbox unchecked under the NIC properties.

In addition, when I do nslookup on my workstation I get this:

C:\Windows\system32>nslookup server Server: dns.domain.com Address: 192.168.4.4

Name: server.domain.com Addresses: 2002:c001:205::c001:205 192.168.2.5

When i do the same thing from the DC, I get this: C:>nslookup server Server: dns.domain.com Address: 192.168.4.4

Name: server.domain.com Address: 192.168.2.5

Any thoughts on where this IPv6 is coming from?

Cheers,

Marvin

share|improve this question
    
Caching? Try a ipconfig /flushdns on your workstation and then try again. Also manually yank out the AAAA records in your DNS to make sure. –  Nathan C May 23 '13 at 15:21
2  
Take a look at Microsoft's recommendation about disabling IPv6: "From Microsoft's perspective, IPv6 is a mandatory part of the Windows operating system" –  Tanner May 23 '13 at 15:22
2  
"IPv6 is disabled on my workstation": Seeing as actual IPv6 packets are getting sent and responded to, that's clearly not true :-) –  Celada May 23 '13 at 15:24
    
Nathan C:I have tried ipconfig/flushdns but it didn't do anything. Celada: Agreed, except this issue started happening this week (wasn't happening before), and as I said all of the NICs on the network have IPv6 unchecked. In addition, I've followed Microsoft guidelines outlined here -> technet.microsoft.com/en-us/network/cc987595.aspx (as r.tanner.f mentioned) on how to disable it, but the issue persists. I am truly at a loss as to why it is happening... –  Marvin May 23 '13 at 18:00

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