Hi Karl-Philipp, yesterday I experienced exactly the situation you described above (14.04 with isc-dhcp-client 4.2.4-7ubuntu12). No packets received at DHCP server.
Nov 20 13:11:46 hostabc dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7 (xid=0x656360a9) Nov 20 13:11:53 hostabc dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 15 (xid=0x656360a9) Nov 20 13:12:08 hostabc dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 18 (xid=0x656360a9) Nov 20 13:12:26 hostabc dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 20 (xid=0x656360a9) Nov 20 13:12:46 hostabc dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 9 (xid=0x656360a9) Nov 20 13:12:55 hostabc dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 13 (xid=0x656360a9) Nov 20 13:13:08 hostabc dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8 (xid=0x656360a9) Nov 20 13:13:16 hostabc dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 10 (xid=0x656360a9) Nov 20 13:13:26 hostabc dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 11 (xid=0x656360a9) [...] Nov 20 13:16:40 hostabc dhclient: No DHCPOFFERS received. Nov 20 13:16:40 hostabc dhclient: No working leases in persistent database - sleeping. Then I plugged out the eth0 cable, the dhclient logged a DHCPRELEASE, of course, could not send that: Nov 20 13:16:40 hostabc netplugd[8349]: /etc/netplug/netplug eth0 out -> pid 8349 Nov 20 13:16:40 hostabc dhclient: Internet Systems Consortium DHCP Client 4.2.4 Nov 20 13:16:40 hostabc dhclient: Copyright 2004-2012 Internet Systems Consortium. Nov 20 13:16:40 hostabc dhclient: All rights reserved. Nov 20 13:16:40 hostabc dhclient: For info, please visit https://www.isc.org/software/dhcp/ Nov 20 13:16:40 hostabc dhclient: Nov 20 13:16:40 hostabc dhclient: Listening on LPF/eth0/00:0b:ab:7e:d1:90 Nov 20 13:16:40 hostabc dhclient: Sending on LPF/eth0/00:0b:ab:7e:d1:90 Nov 20 13:16:40 hostabc dhclient: Sending on Socket/fallback Nov 20 13:16:40 hostabc dhclient: DHCPRELEASE on eth0 to 10.10.9.12 port 67 (xid=0x57c9137d) Nov 20 13:16:40 hostabc dhclient: send_packet: Network is unreachable Nov 20 13:16:40 hostabc dhclient: send_packet: please consult README file regarding broadcast address. Nov 20 13:16:40 hostabc dhclient: dhclient.c:2365: Failed to send 300 byte long packet over fallback interface. Then, plugged the cable in again and got a correct answer (or at least, the request was sent, finally): Nov 20 13:16:43 hostabc netplugd[8421]: /etc/netplug/netplug eth0 in -> pid 8421 Nov 20 13:16:43 hostabc dhclient: Internet Systems Consortium DHCP Client 4.2.4 Nov 20 13:16:43 hostabc dhclient: Copyright 2004-2012 Internet Systems Consortium. Nov 20 13:16:43 hostabc dhclient: All rights reserved. Nov 20 13:16:43 hostabc dhclient: For info, please visit https://www.isc.org/software/dhcp/ Nov 20 13:16:43 hostabc dhclient: Nov 20 13:16:43 hostabc dhclient: Listening on LPF/eth0/00:0b:ab:7e:d1:90 Nov 20 13:16:43 hostabc dhclient: Sending on LPF/eth0/00:0b:ab:7e:d1:90 Nov 20 13:16:43 hostabc dhclient: Sending on Socket/fallback Nov 20 13:16:43 hostabc dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3 (xid=0x333c6b38) Nov 20 13:16:43 hostabc dhclient: DHCPREQUEST of 10.10.18.132 on eth0 to 255.255.255.255 port 67 (xid=0x333c6b38) Nov 20 13:16:43 hostabc dhclient: DHCPOFFER of 10.10.18.132 from 10.10.16.98 Nov 20 13:16:43 hostabc dhclient: DHCPACK of 10.10.18.132 from 10.10.16.98 Currently I'm testing a workaround by using netplugd + additional commands "dhclient -r <iface> && dhclient <iface>", but I would be glad to have a better solution for that. Did you already try a newer version from - 14.10: (http://packages.ubuntu.com/de/utopic/isc-dhcp-client) or - 15.04: (packages.ubuntu.com/de/vivid/isc-dhcp-client) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1350759 Title: dhclient logs DHCPDISCOVER request (stdout and syslog) but doesn't send anything To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1350759/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
