Verification for Trusty: ## server root@dixie:~# lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04.5 LTS Release: 14.04 Codename: trusty root@dixie:~# dpkg -l | grep dhcp ii isc-dhcp-client 4.2.4-7ubuntu12.6 amd64 ISC DHCP client ii isc-dhcp-common 4.2.4-7ubuntu12.6 amd64 common files used by all the isc-dhcp* packages ii isc-dhcp-server 4.2.4-7ubuntu12.6 amd64 ISC DHCP server for automatic IP address assignment ## client root@hertz:~# lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04.5 LTS Release: 14.04 Codename: trusty root@hertz:~# dpkg -l | grep dhcp ii isc-dhcp-client 4.2.4-7ubuntu12.6 amd64 ISC DHCP client ii isc-dhcp-common 4.2.4-7ubuntu12.6 amd64 common files used by all the isc-dhcp* packages ---------- ## tcpdump showing broadcast flag set (client was able to get IP) root@dixie:~# tcpdump -i ib0 -nn -vvv -S Sep 8 12:31:32 dixie kernel: [ 1763.559815] device ib0 entered promiscuous mode tcpdump: listening on ib0, link-type LINUX_SLL (Linux cooked), capture size 65535 bytes Sep 8 12:31:36 dixie dhcpd: DHCPDISCOVER from via ib0 Sep 8 12:31:36 dixie dhcpd: DHCPOFFER on 172.16.0.19 to via ib0 Sep 8 12:31:36 dixie dhcpd: Dynamic and static leases present for 172.16.0.19. Sep 8 12:31:36 dixie dhcpd: Remove host declaration dixie or remove 172.16.0.19 Sep 8 12:31:36 dixie dhcpd: from the dynamic address pool for 172.16.0.0/24 Sep 8 12:31:36 dixie dhcpd: DHCPREQUEST for 172.16.0.19 (172.16.0.1) from via ib0 Sep 8 12:31:36 dixie dhcpd: DHCPACK on 172.16.0.19 to via ib0 12:31:36.612464 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328) 0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request, length 300, htype 32, hlen 0, xid 0x6189781a, Flags [Broadcast] (0x8000) Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Discover Hostname Option 12, length 5: "hertz" Parameter-Request Option 55, length 13: Subnet-Mask, BR, Time-Zone, Default-Gateway Domain-Name, Domain-Name-Server, Option 119, Hostname Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route NTP Client-ID Option 61, length 17: hardware-type 56, 30:3a:30:30:3a:30:30:3a:34:38:3a:46:45:3a:38:30 END Option 255, length 0 PAD Option 0, length 0, occurs 15 12:31:36.612713 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328) 172.16.0.1.67 > 255.255.255.255.68: [udp sum ok] BOOTP/DHCP, Reply, length 300, htype 32, hlen 0, xid 0x6189781a, Flags [Broadcast] (0x8000) Your-IP 172.16.0.19 Server-IP 172.16.0.1 Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Offer Server-ID Option 54, length 4: 172.16.0.1 Lease-Time Option 51, length 4: 600 Subnet-Mask Option 1, length 4: 255.255.255.0 BR Option 28, length 4: 172.16.0.255 Domain-Name Option 15, length 7: "myib.cu" END Option 255, length 0 PAD Option 0, length 0, occurs 23 12:31:36.612957 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328) 0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request, length 300, htype 32, hlen 0, xid 0x6189781a, Flags [Broadcast] (0x8000) Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Request Server-ID Option 54, length 4: 172.16.0.1 Requested-IP Option 50, length 4: 172.16.0.19 Hostname Option 12, length 5: "hertz" Parameter-Request Option 55, length 13: Subnet-Mask, BR, Time-Zone, Default-Gateway Domain-Name, Domain-Name-Server, Option 119, Hostname Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route NTP Client-ID Option 61, length 17: hardware-type 56, 30:3a:30:30:3a:30:30:3a:34:38:3a:46:45:3a:38:30 END Option 255, length 0 PAD Option 0, length 0, occurs 3 12:31:36.613122 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328) 172.16.0.1.67 > 255.255.255.255.68: [udp sum ok] BOOTP/DHCP, Reply, length 300, htype 32, hlen 0, xid 0x6189781a, Flags [Broadcast] (0x8000) Your-IP 172.16.0.19 Server-IP 172.16.0.1 Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: ACK Server-ID Option 54, length 4: 172.16.0.1 Lease-Time Option 51, length 4: 600 Subnet-Mask Option 1, length 4: 255.255.255.0 BR Option 28, length 4: 172.16.0.255 Domain-Name Option 15, length 7: "myib.cu" END Option 255, length 0 PAD Option 0, length 0, occurs 23 ^C 4 packets captured 4 packets received by filter