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IPv6 disabled, cannot ping IPv4 IP

Posted on 2011-02-17
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Last Modified: 2012-05-11
REally strange:

I cannot ping through my network while disabling IPv6, but as soon as I enable IPv6 I can ping through my network lab...any ideas?
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Question by:vulture714
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Expert Comment

by:IPv6Guy
ID: 34922923
What Operating Systems? Can you copy/paste your ping?
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Author Comment

by:vulture714
ID: 34922965
For example,

My server ip address is 10.1.1.100

Two clients are 10.1.1.101
and

10.1.1.102

But like I mentioned, when IPv6 is disabled, I can't ping.
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by:IPv6Guy
ID: 34922982
Operating System?
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Author Comment

by:vulture714
ID: 34922990
This is on Win7
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IPv6Guy earned 2000 total points
ID: 34923004
can you paste the results of the commands:

netsh int ipv4 sho int

and

netsh int ipv6 sho int
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Author Comment

by:vulture714
ID: 34923032
C:\Users\gg-204b4>netsh int ipv4 sho int

Idx     Met         MTU          State                Name
---  ----------  ----------  ------------  ---------------------------
  1          50  4294967295  connected     Loopback Pseudo-Interface 1
 11          10        1500  connected     Local Area Connection


C:\Users\gg-204b4>netsh int ipv6 sho int

Idx     Met         MTU          State                Name
---  ----------  ----------  ------------  ---------------------------
  1          50  4294967295  connected     Loopback Pseudo-Interface 1
 11          10        1280   disconnected     isatap.contoso.com
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Author Comment

by:vulture714
ID: 34923077
Sorry I forgot to post the last part of the IPv6 (last line)


C:\Users\gg-204b4>netsh int ipv6 sho int

Idx     Met         MTU          State                Name
---  ----------  ----------  ------------  ---------------------------
  1          50  4294967295  connected     Loopback Pseudo-Interface 1
 11          10        1280   disconnected     isatap.contoso.com

13      50      1280      disconnected       local Area Connection* 9
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Expert Comment

by:IPv6Guy
ID: 34923081
I assume IPv6 is disabled for the above screenshot? If so, how did you disable it? (Registry, Adapter properties?)

It appears that somewhere in your network, someone has an ISATAP router configured. That could be interfering with the ping when it is enabled.

Recommendations:

1. Get rid of ISATAP unless you are testing it. Make sure that the name isatap is not registered in DNS.
2. If this doesn't work, follow the instructions at http://support.microsoft.com/kb/929852 and set DisabledComponents to 0x01 (This disables all tunnel interfaces)

One of these two should fix your issue. Let me know how it goes - I'll be back online tomorrow.
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Author Comment

by:vulture714
ID: 34923095
I disabled it through Adapter properties, but I don't think that it's based on whether or not I hav e a ISATAP router because I also tested this on a LIVE environment, and the same thing occured.
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Expert Comment

by:IPv6Guy
ID: 34923141
IPv4 can ping just fine without IPv6 on Win 7, so something is interfering with the ping. Do me a favor and re-enable IPv6 on the Adapter properties, set the disabledcomponents key as I described above, and try adding the -4 switch to the ping command, so it looks like

ping -4 10.1.1.100

and send in the full copy/past of the results.

We'll get you working.
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Author Comment

by:vulture714
ID: 34923174
sorry,

We'll have to do tomorrow, have to go.  Thanks for your help.
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