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Old 11-03-2017, 08:01 AM   #1
Registered: Jan 2009
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IPv6 not working

Recently we moved the Base OS of our product from centos 6 to centos 7. Since then configuring IPv6 using slaac doesn't work. I am quite new to ipv6 and doesn't have much clue on how to proceed on this.
Can someone help on how to troubleshoot this.
Thought of restarting network and then do a Network capture and find whats going wrong, but tcpdump fails since the interface goes down during network restart. An attempt to capture network as soon as "ifup eth0" was executed, also didn't help.

Old 11-03-2017, 01:13 PM   #2
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Are you running ip(6)tables? Make sure you are not blocking ipv6-icmp or else you won't get router advertisements.
Old 11-04-2017, 04:46 AM   #3
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Thanks, I disabled ip6tables and restarted network, but still no luck.
Any idea how do I trace whats really happening with this router advertisements.
I am sure the server is getting the RA because if the switch to centos 6 (its a dual boot system with centos 6 and centos 7), slaac starts working.
Old 11-06-2017, 09:08 AM   #4
Registered: Dec 2016
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Hi, Can you execute the following commands and paste the output here?

route -A inet6
ip -f inet6 addr
Old 11-16-2017, 11:47 PM   #5
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We can mark this issue as resolved.
Issue was resolved by making use of network manager.
In centos 6, we just used the standard network service and everything including ipv6 was working.
Thought that it would work the same way in centos 7 as well, without using network manager.


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