Each NIC has 2 IP addresses - cannot work out why

July 6, 2013

Hello,

I have just noticed something strange on one of my servers - each NIC has the normal assigned IP addresses that I have configured, then there is an extra one, which always ends up one of the 169.x auto-configuration addresses. I have looked through the configuration and there is definitely only one IP address assigned to each NIC.

Any ideas? This is the output from ipconfig:

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\Administrator>ipconfig

Windows IP Configuration


Ethernet adapter VLAN5 Wireless:

   Connection-specific DNS Suffix  . : thegellfamily.internal
   IPv6 Address. . . . . . . . . . . : 2001:470:6a2d:2:ccdb:3750:3d83:eb1
   Link-local IPv6 Address . . . . . : fe80::ccdb:3750:3d83:eb1%16
   IPv4 Address. . . . . . . . . . . : 172.16.32.13
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   IPv4 Address. . . . . . . . . . . : 169.254.227.68
   Subnet Mask . . . . . . . . . . . : 255.255.0.0
   Default Gateway . . . . . . . . . : fe80::20c:42ff:fea8:758%16
                                       172.16.32.1

Ethernet adapter VLAN4 Data:

   Connection-specific DNS Suffix  . :
   IPv6 Address. . . . . . . . . . . : 2001:470:6a2d:1::ffff
   IPv6 Address. . . . . . . . . . . : 2001:470:6a2d:1:713e:dd8a:93c9:5143
   Link-local IPv6 Address . . . . . : fe80::713e:dd8a:93c9:5143%13
   IPv4 Address. . . . . . . . . . . : 192.168.32.239
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   IPv4 Address. . . . . . . . . . . : 169.254.190.36
   Subnet Mask . . . . . . . . . . . : 255.255.0.0
   Default Gateway . . . . . . . . . : fe80::20c:42ff:fea8:757%13
                                       192.168.32.1

Thanks in advance,

Tony

31,964 · July 6, 2013

169.254 is APIPA -- can you please post output of ipconfig /all

like this

C:\Windows\System32>ipconfig /all

Windows IP Configuration

   Host Name . . . . . . . . . . . . : i5-w7
   Primary Dns Suffix  . . . . . . . : local.lan
   Node Type . . . . . . . . . . . . : Broadcast
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : local.lan

Ethernet adapter Local:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Broadcom NetLink (TM) Gigabit Ethernet
   Physical Address. . . . . . . . . : 18-03-73-B1-0D-D3
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv6 Address. . . . . . . . . . . : 2001:470:snipped::666(Preferred)
   Link-local IPv6 Address . . . . . : fe80::1a03:73ff:feb1:dd3%11(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.1.100(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 2001:470:snipped::1
                                       192.168.1.253
   DHCPv6 IAID . . . . . . . . . . . : 236454771
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-19-39-96-D8-18-03-73-B1-0D-D3
   DNS Servers . . . . . . . . . . . : 192.168.1.253
   NetBIOS over Tcpip. . . . . . . . : Enabled

C:\Windows\System32>

July 6, 2013

Output of ipconfig /all
C:\Users\Administrator>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : Server

Primary Dns Suffix . . . . . . . : thegellfamily.internal

Node Type . . . . . . . . . . . . : Hybrid

IP Routing Enabled. . . . . . . . : No

WINS Proxy Enabled. . . . . . . . : No

DNS Suffix Search List. . . . . . : thegellfamily.internal

Ethernet adapter VLAN5 Wireless:

Connection-specific DNS Suffix . : thegellfamily.internal

Description . . . . . . . . . . . : vmxnet3 Ethernet Adapter #3

Physical Address. . . . . . . . . : 00-0C-29-19-AA-85

DHCP Enabled. . . . . . . . . . . : Yes

Autoconfiguration Enabled . . . . : Yes

IPv6 Address. . . . . . . . . . . : 2001:470:6a2d:2:ccdb:3750:3d83:eb1(Prefer

red)

Link-local IPv6 Address . . . . . : fe80::ccdb:3750:3d83:eb1%16(Preferred)

IPv4 Address. . . . . . . . . . . : 172.16.32.13(Preferred)

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Lease Obtained. . . . . . . . . . : 03 July 2013 19:07:54

Lease Expires . . . . . . . . . . : 06 July 2013 21:48:56

IPv4 Address. . . . . . . . . . . : 169.254.227.68(Preferred)

Subnet Mask . . . . . . . . . . . : 255.255.0.0

Default Gateway . . . . . . . . . : fe80::20c:42ff:fea8:758%16

172.16.32.1

DHCP Server . . . . . . . . . . . : 192.168.32.239

DNS Servers . . . . . . . . . . . : 192.168.32.239

192.168.12.240

192.168.32.1

NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter VLAN4 Data:

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : vmxnet3 Ethernet Adapter

Physical Address. . . . . . . . . : 00-0C-29-19-AA-7B

DHCP Enabled. . . . . . . . . . . : No

Autoconfiguration Enabled . . . . : Yes

IPv6 Address. . . . . . . . . . . : 2001:470:6a2d:1::ffff(Preferred)

IPv6 Address. . . . . . . . . . . : 2001:470:6a2d:1:713e:dd8a:93c9:5143(Prefe

rred)

Link-local IPv6 Address . . . . . : fe80::713e:dd8a:93c9:5143%13(Preferred)

IPv4 Address. . . . . . . . . . . : 192.168.32.239(Preferred)

Subnet Mask . . . . . . . . . . . : 255.255.255.0

IPv4 Address. . . . . . . . . . . : 169.254.190.36(Preferred)

Subnet Mask . . . . . . . . . . . : 255.255.0.0

Default Gateway . . . . . . . . . : fe80::20c:42ff:fea8:757%13

192.168.32.1

DNS Servers . . . . . . . . . . . : 2001:470:6a2e:1::ffff

2001:470:6a2d:1::ffff

192.168.12.240

192.168.32.239

NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.{A884C28C-8F4D-45F3-A20A-14AA09850EDD}:

Media State . . . . . . . . . . . : Media disconnected

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Microsoft ISATAP Adapter

Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0

DHCP Enabled. . . . . . . . . . . : No

Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 9:

Media State . . . . . . . . . . . : Media disconnected

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Microsoft Teredo Tunneling Adapter

Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0

DHCP Enabled. . . . . . . . . . . : No

Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.thegellfamily.internal:

Media State . . . . . . . . . . . : Media disconnected

Connection-specific DNS Suffix . : thegellfamily.internal

Description . . . . . . . . . . . : Microsoft ISATAP Adapter #3

Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0

DHCP Enabled. . . . . . . . . . . : No

Autoconfiguration Enabled . . . . : Yes

C:\Users\Administrator>

6,410 · July 6, 2013

Failover Cluster Node ? This is normal for active/passive clusters.

31,964 · July 6, 2013

So this is a vm then "vmxnet3"

So I see dhcp is enabled

DHCP Enabled. . . . . . . . . . . : Yes

Is the IP set static that your wanting vs the 169 address? I see you got a lease

Lease Obtained. . . . . . . . . . : 03 July 2013 19:07:54

Lease Expires . . . . . . . . . . : 06 July 2013 21:48:56

from

DHCP Server . . . . . . . . . . . : 192.168.32.239

Also why would you have 2 default gateways setup?? I see you have default gw on both your interfaces - this is RARELY a good idea!!! To be honest multihomed like what you have is odd setup as well generally.

July 6, 2013

On 06/07/2013 at 15:06, TPreston said:
Failover Cluster Node ? This is normal for active/passive clusters.

On 06/07/2013 at 15:09, BudMan said:

So this is a vm then "vmxnet3"

So I see dhcp is enabled

DHCP Enabled. . . . . . . . . . . : Yes

Is the IP set static that your wanting vs the 169 address? I see you got a lease

Lease Obtained. . . . . . . . . . : 03 July 2013 19:07:54

Lease Expires . . . . . . . . . . : 06 July 2013 21:48:56

from

DHCP Server . . . . . . . . . . . : 192.168.32.239

I just checked and the clustering components are not installed.

Yeah it is a VM. On the VLAN4 NIC, it is set to a static IP and VLAN5 is DHCP. It is the extra 169 address per interface that I want to try and get rid of, or find out why it is there.

31,964 · July 6, 2013

Do you have host only network setup or something on these VMs? What mode do you have them in NAT, Bridged, etc. in your VM software? Is this ia esxi box or vmplayer, some other vmware?

Need some details of how you have this vmsetup.. And are you really doing vlan tagging? Or are these different physical networks and your just calling them vlans?

So in your vmware you have tagging turned on in the vswitches? In your physical network your using what for your switch that handles vlans?

And not related to your issue - but how do you think your using default gateways on these interfaces? This is almost always 99.999% a broken config!! Do you really have 2 different paths to the internet? Or lots and lots of other networks?

July 6, 2013

On 06/07/2013 at 15:41, BudMan said:

Do you have host only network setup or something on these VMs? What mode do you have them in NAT, Bridged, etc. in your VM software? Is this ia esxi box or vmplayer, some other vmware?

Need some details of how you have this vmsetup.. And are you really doing vlan tagging? Or are these different physical networks and your just calling them vlans?

So in your vmware you have tagging turned on in the vswitches? In your physical network your using what for your switch that handles vlans?

And not related to your issue - but how do you think your using default gateways on these interfaces? This is almost always 99.999% a broken config!! Do you really have 2 different paths to the internet? Or lots and lots of other networks?

I'll get some screenshots in a minute. Each NIC is linked to a different VLAN in ESXi 5. Tagging is done by ESXi. The physical sewitch has 4 VLANs tagged for that port, and an unused VLAN for the PVID. It is a Netgear GS110TP.

For the two gateways configured problem - I have set the VLAN5 interface metric manually to 200 so that it will never be used as the default gateway (unless VLAN4 goes down). It would be OK to use this route if it did failover.

I will re-post with screenshots in a few minutes.

July 6, 2013

11,094 · July 6, 2013

Dont forget to check your alternative configuration, you can assign multiple ips per nic with that.

July 6, 2013

On 06/07/2013 at 16:32, sc302 said:
Dont forget to check your alternative configuration, you can assign multiple ips per nic with that.

Nothing configured in Alternate Configuration tab for VLAN5. Tab not displayed on VLAN4 as it has static IP.

31,964 · July 6, 2013

I would guess your issues is related to this

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2012646

So fix the registry for this nic, or you could prob just delete and reinstall the nic.

July 11, 2013

On 06/07/2013 at 20:49, BudMan said:

I would guess your issues is related to this

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2012646

So fix the registry for this nic, or you could prob just delete and reinstall the nic.

Your post got me looking through that part of the registry, and somehow there were two GUIDs referencing the same IP address under tcpip\parameters\interfaces . One GUID has the static IP set, and is correct. The other GUID had DHCPClient set to 1, but the IP address fields were already filled with the same details as the static entry e.g. 192.168.32.239.

~~It appears the one with the DHCPClient set to 1, is infact a ghost entry which has no physical network access, but still binds to the VLAN4 interface. Hence the autoconfiguration IP address 169.x .~~

~~Very VERY strange - something I have never seen before. I will post screenshots that hopefully clarify what had happened.~~

~~Thank you all for your help,~~

~~Tony~~

EDIT: It didn't fix it. Doh!

31,964 · July 11, 2013

What didn't fix it - did you delete the entry?

Can you post up the export of your reg entries?

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Each NIC has 2 IP addresses - cannot work out why

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