Using Ubuntu 16.04, almost every day I'm loosing IPv4 address, being dropped by Avahi Daemon.Also, I see the DHCP is not waiting for leasing time to finish to request an address again, it does it every some minutes, but I cannot see a pattern.Then, suddenly and without any previous error, Avahi Daemon withdraws the IP from interface eth0:Aug 11 11:55:14 jorgee avahi-daemon[2734]: Withdrawing address record for 192.168.2.94 on eth0.This is the last part of the syslog.Aug 11 11:43:11 jorgee systemd[1]: Started Automatically refresh installed snaps.Aug 11 11:43:11 jorgee systemd[1]: snapd.refresh.timer: Adding 4h 33min 5.892892s random time.Aug 11 11:43:11 jorgee systemd[1]: snapd.refresh.timer: Adding 48min 39.947211s random time.Aug 11 11:43:13 jorgee dbus[2803]: [system] Reloaded configurationAug 11 11:44:04 jorgee dhclient[12492]: DHCPREQUEST of 192.168.2.94 on eth0 to 192.168.2.254 port 67 (xid=0x188018e6)Aug 11 11:44:04 jorgee dhclient[12492]: DHCPACK of 192.168.2.94 from 192.168.2.254Aug 11 11:44:04 jorgee root: /etc/dhcp/dhclient-enter-hooks.d/avahi-autoipd returned non-zero exit status 1Aug 11 11:44:05 jorgee dhclient[12492]: bound to 192.168.2.94 -- renewal in 800 seconds.Aug 11 11:46:15 jorgee dhclient[12636]: DHCPREQUEST of 192.168.2.94 on eth0 to 192.168.2.254 port 67 (xid=0x51cc22fc)Aug 11 11:46:15 jorgee dhclient[12636]: DHCPACK of 192.168.2.94 from 192.168.2.254Aug 11 11:46:15 jorgee root: /etc/dhcp/dhclient-enter-hooks.d/avahi-autoipd returned non-zero exit status 1Aug 11 11:46:15 jorgee dhclient[12636]: bound to 192.168.2.94 -- renewal in 758 seconds.Aug 11 11:47:33 jorgee dhclient[12712]: DHCPREQUEST of 192.168.2.94 on eth0 to 192.168.2.254 port 67 (xid=0x6788bfce)Aug 11 11:47:33 jorgee dhclient[12712]: DHCPACK of 192.168.2.94 from 192.168.2.254Aug 11 11:47:33 jorgee root: /etc/dhcp/dhclient-enter-hooks.d/avahi-autoipd returned non-zero exit status 1Aug 11 11:47:33 jorgee dhclient[12712]: bound to 192.168.2.94 -- renewal in 746 seconds.Aug 11 11:49:08 jorgee systemd-timesyncd[12709]: Timed out waiting for reply from 192.168.2.254:123 (192.168.2.254).Aug 11 11:52:42 jorgee dhclient[14855]: DHCPREQUEST of 192.168.2.94 on eth0 to 192.168.2.254 port 67 (xid=0x41dfce98)Aug 11 11:52:42 jorgee dhclient[14855]: DHCPACK of 192.168.2.94 from 192.168.2.254Aug 11 11:52:42 jorgee dhclient[14855]: bound to 192.168.2.94 -- renewal in 703 seconds.Aug 11 11:54:16 jorgee dhclient[12677]: DHCPREQUEST of 192.168.2.94 on eth0 to 192.168.2.254 port 67 (xid=0x7456460e)Aug 11 11:54:16 jorgee dhclient[12677]: DHCPACK of 192.168.2.94 from 192.168.2.254Aug 11 11:54:16 jorgee root: /etc/dhcp/dhclient-enter-hooks.d/avahi-autoipd returned non-zero exit status 1Aug 11 11:54:17 jorgee dhclient[12677]: bound to 192.168.2.94 -- renewal in 770 seconds.Aug 11 11:55:14 jorgee avahi-daemon[2734]: Withdrawing address record for 192.168.2.94 on eth0.Aug 11 11:55:14 jorgee avahi-daemon[2734]: Leaving mDNS multicast group on interface eth0.IPv4 with address 192.168.2.94.Aug 11 11:55:14 jorgee avahi-daemon[2734]: Interface eth0.IPv4 no longer relevant for mDNS.Aug 11 11:55:16 jorgee whoopsie[2731]: [11:55:16] Cannot reach: https://daisy.ubuntu.comAug 11 11:55:16 jorgee whoopsie[2731]: [11:55:16] offlineAug 11 11:56:14 jorgee sudo: pam_ecryptfs: pam_sm_authenticate: /home/jorgee is already mountedAug 11 11:56:34 jorgee dhclient[11554]: DHCPREQUEST of 192.168.2.94 on eth0 to 192.168.2.254 port 67 (xid=0x2894ec32)Aug 11 11:56:34 jorgee dhclient[11554]: send_packet: Network is unreachableAug 11 11:56:34 jorgee dhclient[11554]: send_packet: please consult README file regarding broadcast address.Aug 11 11:56:34 jorgee dhclient[11554]: dhclient.c:2386: Failed to send 300 byte long packet over fallback interface.Aug 11 11:56:37 jorgee dhclient[11554]: DHCPREQUEST of 192.168.2.94 on eth0 to 192.168.2.254 port 67 (xid=0x2894ec32)Aug 11 11:56:37 jorgee dhclient[11554]: send_packet: Network is unreachableAug 11 11:56:37 jorgee dhclient[11554]: send_packet: please consult README file regarding broadcast address.Aug 11 11:56:37 jorgee dhclient[11554]: dhclient.c:2386: Failed to send 300 byte long packet over fallback interface.Aug 11 11:56:42 jorgee dhclient[11554]: DHCPREQUEST of 192.168.2.94 on eth0 to 192.168.2.254 port 67 (xid=0x2894ec32)Aug 11 11:56:42 jorgee dhclient[11554]: send_packet: Network is unreachableAug 11 11:56:42 jorgee dhclient[11554]: send_packet: please consult README file regarding broadcast address.Aug 11 11:56:42 jorgee dhclient[11554]: dhclient.c:2386: Failed to send 300 byte long packet over fallback interface.Edit:Bind9 config:acl lan {    127.0.0.0/8;    192.168.0.0/16;};view lan-dmz {        match-clients { key lan-dmz; !key wan; lan; };        server 192.168.1.24 { keys lan-dmz; };        allow-recursion {lan; };        recursion yes;        zone aaaa.edu.ar {        type master;        file /var/cache/bind/aaaa.edu.ar.lan-dmz;};        zone aaaa.local IN {        type forward;        forwarders { 192.168.1.123; 192.168.1.124;};        };};view wan {        match-clients { key wan; !key lan-dmz; !lan; any; };        server 192.168.1.24 { keys wan; };        recursion no;        zone aaaa.edu.ar {        type master;    allow-transfer { 192.168.1.24; 170.210.44.2; 170.210.44.3; };        allow-query { any; };        also-notify { 192.168.1.24; 170.210.44.2; 170.210.44.3; };        file /var/cache/bind/aaaa.edu.ar.wan;};};
Loosing IPv4 and DHCP constantly asking for IP
networking;networkmanager;dhcp;ipv4;avahi