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Old 10-17-2018, 09:14 AM   #1
R.N.RAM KANNAN
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Registered: Oct 2009
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Smile IPv6 duplicate address


Hi,

When ever i reboot my Red hat Linux 7.4 OS, Iam getting the below error.

[ 13.405669] IPv6: ens192: IPv6 duplicate address xxx::xxx:xxx:xxx:xxx detected!

Iam not able to find resolution for this issue.

Can any one assist me on this issue ?

Thanks
RK.
 
Old 10-17-2018, 09:21 AM   #2
muhammednavas
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can you paste more details here.?


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Last edited by rtmistler; 10-17-2018 at 10:23 AM.
 
Old 10-17-2018, 09:28 AM   #3
R.N.RAM KANNAN
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Hi,

Below are my network configuration file.

[root@xxxxx ~]# cat /etc/sysconfig/network-scripts/ifcfg-ens192
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens192
UUID=ed8b2186-758a-4cd3-829f-91b371cd0324
DEVICE=ens192
ONBOOT=yes
IPV6_PRIVACY=no
IPADDR=10.16.20.200
PREFIX=26
GATEWAY=10.16.20.111
PEERROUTES=no
[root@xxxxx ~]#

Thanks
RK.
 
Old 10-17-2018, 09:46 AM   #4
TB0ne
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Quote:
Originally Posted by R.N.RAM KANNAN View Post
Hi,
When ever i reboot my Red hat Linux 7.4 OS, Iam getting the below error.
Code:
[   13.405669] IPv6: ens192: IPv6 duplicate address xxx::xxx:xxx:xxx:xxx detected!
Iam not able to find resolution for this issue. Can any one assist me on this issue ?
What assistance would you like?? The error is VERY clear...you have another IPv6 address on your network. Either change this host, or change the other one.

And have you contacted RHEL support??? You're PAYING FOR RHEL, RIGHT? You've been asked about this many times in the past, but don't ever address it. You also haven't followed up in many of your other threads.

Last edited by TB0ne; 10-17-2018 at 09:49 AM.
 
Old 10-17-2018, 10:21 AM   #5
dc.901
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If you are not using IPv6 then simply disable it with:

Code:
IPV6INIT=no
Then, down/up the interface...
 
Old 10-18-2018, 06:11 AM   #6
R.N.RAM KANNAN
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Hi,

Thanks

Even after changing IPV6INIT=no iam getting the same error.

Regards
RK.
 
Old 10-18-2018, 06:18 AM   #7
dc.901
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Quote:
Originally Posted by R.N.RAM KANNAN View Post
Even after changing IPV6INIT=no iam getting the same error.
Did you down and up the interface?
 
Old 10-18-2018, 06:25 AM   #8
R.N.RAM KANNAN
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Thanks a lot for your quick reply.

Yes. Even i rebooted the server once.

Regards
RK.
 
Old 10-18-2018, 06:36 AM   #9
dc.901
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Quote:
Originally Posted by R.N.RAM KANNAN View Post
Yes. Even i rebooted the server once.
Hmm; have you tried this: https://www.unixmen.com/disable-ipv6-centos-7/
 
Old 10-18-2018, 06:58 AM   #10
TB0ne
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Quote:
Originally Posted by R.N.RAM KANNAN View Post
Hi,
Thanks Even after changing IPV6INIT=no iam getting the same error.
...and....
Quote:
Originally Posted by R.N.RAM KANNAN
Thanks a lot for your quick reply. Yes. Even i rebooted the server once.
Thanks for ignoring my reply, again. You were asked specifically:
  • Are you paying for RHEL?? Because this is a *KNOWN BUG* that has been fixed with a patch. And again...unless you PAY FOR RHEL, you won't get that patch.
  • Are you using IPv6?? You didn't say yes or no. Are you?
  • What, if *ANY* basic research have you done?
If you don't want to answer there's little point in posting. You can look up this bug in the Red Hat knowledgebase, or (AGAIN) contact RHEL support. You've been here for nine years, and don't ever seem to want to answer questions, or follow up with details. You can also set ipv6 DAD to 0, which will remove that message, but leave the underlying security problem/bug that was fixed by Red Hat.
 
Old 10-18-2018, 07:09 AM   #11
l0f4r0
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Quote:
Originally Posted by TB0ne View Post
  • Are you paying for RHEL?? Because this is a *KNOWN BUG* that has been fixed with a patch. And again...unless you PAY FOR RHEL, you won't get that patch.
Like this one https://access.redhat.com/errata/RHBA-2017:3234?
 
Old 10-18-2018, 07:47 AM   #12
R.N.RAM KANNAN
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Thank you dc.901 and all for your support and help.

- -After disabling IPv6 i didn't face this issue even after reboot.


I followed the below link to solve the issue.

https://www.unixmen.com/disable-ipv6-centos-7/

Regards
RK
 
Old 10-18-2018, 07:47 AM   #13
TB0ne
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Quote:
Originally Posted by l0f4r0 View Post
The very one, but was going to leave that for the OP to look up.
 
Old 10-18-2018, 07:50 AM   #14
TB0ne
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Quote:
Originally Posted by R.N.RAM KANNAN View Post
Thank you dc.901 and all for your support and help.

- -After disabling IPv6 i didn't face this issue even after reboot.

I followed the below link to solve the issue.
https://www.unixmen.com/disable-ipv6-centos-7/
Some reason you couldn't tell us/answer the question, when you were asked if you were using IPv6???
 
  


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