[CentOS] CentOS 7, NM, and IPv6

[Gordon Messmer]

On 07/12/2017 07:13 AM, m.roth at 5-cent.us wrote:
>     4. It appears to try, several times, and then give up - as our
>         manager puts it, "I to renew the lease", "Here it is","Nope,
>         don't like that, try again", and eventually, after 4 or 5 or
>         so tries, gives up.


NM tends to log fairly verbose information.  It sounds like you've 
looked at the network traffic.  Have you looked at the logs on the 
affected systems?