Yes, I can replicate this exactly - same issue - please refer: https://answers.launchpad.net/ubuntu/+question/13064 It seems DHCP is the issue. Here is more info from my system logs: Sep 9 13:00:58 palantir avahi-daemon[5314]: No service found in /etc/avahi/services. Sep 9 13:00:58 palantir avahi-daemon[5314]: Joining mDNS multicast group on interface eth0.IPv4 with address 192.168.1.30. Sep 9 13:00:58 palantir avahi-daemon[5314]: New relevant interface eth0.IPv4 for mDNS. Sep 9 13:00:58 palantir avahi-daemon[5314]: Network interface enumeration completed. Sep 9 13:00:58 palantir avahi-daemon[5314]: Registering new address record for fe80::21c:23ff:fe92:b82e on eth0.*. Sep 9 13:00:58 palantir avahi-daemon[5314]: Registering new address record for 192.168.1.30 on eth0.IPv4. Sep 9 13:00:58 palantir avahi-daemon[5314]: Registering HINFO record with values 'I686'/'LINUX'. Sep 9 13:00:58 palantir NetworkManager: ^Inm_device_init(): device's worker thread started, continuing. Sep 9 13:00:58 palantir NetworkManager: ^INow managing wired Ethernet (802.3) device 'eth0'. Sep 9 13:00:58 palantir NetworkManager: ^IDeactivating device eth0. Sep 9 13:00:58 palantir avahi-daemon[5314]: Withdrawing address record for 192.168.1.30 on eth0. Sep 9 13:00:58 palantir avahi-daemon[5314]: Leaving mDNS multicast group on interface eth0.IPv4 with address 192.168.1.30. Sep 9 13:00:58 palantir avahi-daemon[5314]: Interface eth0.IPv4 no longer relevant for mDNS. Sep 9 13:00:58 palantir avahi-daemon[5314]: Withdrawing address record for fe80::21c:23ff:fe92:b82e on eth0. Sep 9 13:00:58 palantir NetworkManager: ^IWill activate wired connection 'eth0' because it now has a link. ... ... and then later: Sep 9 13:01:00 palantir ntpd[5676]: ntpd 4.2.2p4@1.1585-o Wed Mar 7 20:43:30 UTC 2007 (1) Sep 9 13:01:00 palantir ntpd[5677]: precision = 1.000 usec Sep 9 13:01:00 palantir ntpd[5677]: Listening on interface wildcard, 0.0.0.0#123 Disabled Sep 9 13:01:00 palantir ntpd[5677]: Listening on interface wildcard, ::#123 Disabled Sep 9 13:01:00 palantir ntpd[5677]: Listening on interface lo, ::1#123 Enabled Sep 9 13:01:00 palantir ntpd[5677]: Listening on interface lo, 127.0.0.1#123 Enabled Sep 9 13:01:00 palantir ntpd[5677]: kernel time sync status 0040 Sep 9 13:01:00 palantir ntpd[5677]: frequency initialized 5.764 PPM from /var/lib/ntp/ntp.drift Sep 9 13:01:00 palantir NetworkManager: ^IDHCP daemon state is now 1 (starting) for interface eth0 Sep 9 13:01:01 palantir ntpd[5677]: sendto(192.168.1.20) (fd=16): Network is unreachable Sep 9 13:01:02 palantir dhclient: DHCPREQUEST on eth0 to 255.255.255.255 port 67 Sep 9 13:01:02 palantir dhclient: DHCPACK from 192.168.1.23 Sep 9 13:01:02 palantir avahi-daemon[5314]: Joining mDNS multicast group on interface eth0.IPv4 with address 192.168.1.30. Sep 9 13:01:02 palantir avahi-daemon[5314]: New relevant interface eth0.IPv4 for mDNS. Sep 9 13:01:02 palantir avahi-daemon[5314]: Registering new address record for 192.168.1.30 on eth0.IPv4. Sep 9 13:01:02 palantir NetworkManager: ^IDHCP daemon state is now 4 (reboot) for interface eth0 Sep 9 13:01:02 palantir NetworkManager: ^IActivation (eth0) Stage 4 of 5 (IP Configure Get) scheduled... Sep 9 13:01:02 palantir NetworkManager: ^IActivation (eth0) Stage 4 of 5 (IP Configure Get) started... Sep 9 13:01:02 palantir dhclient: bound to 192.168.1.30 -- renewal in 17345 seconds. Sep 9 13:01:02 palantir NetworkManager: ^IRetrieved the following IP4 configuration from the DHCP daemon: Sep 9 13:01:02 palantir NetworkManager: ^I address 192.168.1.30 Sep 9 13:01:02 palantir NetworkManager: ^I netmask 255.255.255.0 Sep 9 13:01:02 palantir NetworkManager: ^I broadcast 192.168.1.255 Sep 9 13:01:02 palantir NetworkManager: ^I gateway 192.168.1.20 Sep 9 13:01:02 palantir NetworkManager: ^I nameserver 192.168.1.20 Sep 9 13:01:02 palantir NetworkManager: ^I domain name 'linicks.net' So it seems DHCP goes a bit AWOL. BTW, using a static IP works perfectly fine. Nick