Gordon Messmer wrote: > On 07/12/2017 04:22 PM, mark wrote: >> On 07/12/17 12:09, Gordon Messmer wrote: >>> 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. >>> >> Next, there is *nothing*, not in dmesg*, not in /var/log/messages, to >> indicate when it failed, nor any failure message. No indication why >> the daemon didn't restart it. > > Where did your manager observe the conversation you described above? If > you're watching traffic at the DHCP server, have you tried also > capturing traffic on one of the affected clients? > > Following the failure, does the client have an IPv4 address and no IPv6 > address? Or does it have an IPv6 address and no default route? No IPv6. IIRC, no default, either. mark