## RHEL broadcast flag set during DHCP DISCOVER: (this will tell DHCP server that DHCP response should come as a broadcast BOOT REPLY)
12:29:42.653772 IP (tos 0x0, ttl 128, id 16963, offset 0, flags [none], proto UDP (17), length 341) 0.0.0.0.68 > 255.255.255.255.67: [no cksum] BOOTP/DHCP, Request, length 313, htype 32, hlen 0, xid 0x1f49749f, secs 1024, Flags [Broadcast] (0x8000) Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Discover Hostname Option 12, length 9: "l-supp-22" Vendor-Class Option 60, length 8: "MSFT 5.0" Parameter-Request Option 55, length 13: Subnet-Mask, Domain-Name, Default-Gateway, Domain-Name-Server Netbios-Name-Server, Netbios-Node, Netbios-Scope, Router-Discovery Static-Route, Classless-Static-Route, Classless-Static-Route-Microsoft, Option 252 Vendor-Option Client-ID Option 61, length 20: hardware-type 255, 00:00:00:00:00:02:00:00:02:c9:00:00:02:c9:03:00:fc:78:32 END Option 255, length 0 TTL Option 23, length 0 PAD Option 0, length 0, occurs 6 T254 Option 254, length 128: [|rfc1048 128]
## UBUNTU broadcast flag not set during DHCP DISCOVER
06:42:18.949401 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 0x52bc6268, secs 17, Flags [none] (0 x0000) Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Discover Lease-Time Option 51, length 4: 86400 Parameter-Request Option 55, length 7: Subnet-Mask, BR, Time-Zone, Default-Gateway Domain-Name, Domain-Name-Server, Hostname Client-ID Option 61, length 20: hardware-type 255, 00:00:00:00:00:02:00:00:02:c9:00:f4:52:14:03:00:33:d1:91 END Option 255, length 0 PAD Option 0, length 0, occurs 19
## RHEL broadcast flag set during DHCP DISCOVER:
(this will tell DHCP server that DHCP response should come as a broadcast BOOT REPLY)
12:29:42.653772 IP (tos 0x0, ttl 128, id 16963, offset 0, flags [none], proto UDP (17), length 341)
Vendor- rfc1048 Extensions
DHCP- Message Option 53, length 1: Discover
Hostname Option 12, length 9: "l-supp-22"
Vendor- Class Option 60, length 8: "MSFT 5.0"
Parameter- Request Option 55, length 13:
Subnet- Mask, Domain-Name, Default-Gateway, Domain-Name-Server
Netbios- Name-Server, Netbios-Node, Netbios-Scope, Router-Discovery
Static- Route, Classless- Static- Route, Classless- Static- Route-Microsoft , Option 252
Vendor- Option
Client- ID Option 61, length 20: hardware-type 255, 00:00:00: 00:00:02: 00:00:02: c9:00:00: 02:c9:03: 00:fc:78: 32
0.0.0.0.68 > 255.255.255.255.67: [no cksum] BOOTP/DHCP, Request, length 313, htype 32, hlen 0, xid 0x1f49749f, secs 1024, Flags [Broadcast] (0x8000)
Magic Cookie 0x63825363
END Option 255, length 0
TTL Option 23, length 0
PAD Option 0, length 0, occurs 6
T254 Option 254, length 128: [|rfc1048 128]
## UBUNTU broadcast flag not set during DHCP DISCOVER
06:42:18.949401 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
Vendor- rfc1048 Extensions
DHCP- Message Option 53, length 1: Discover
Lease- Time Option 51, length 4: 86400
Parameter- Request Option 55, length 7:
Subnet- Mask, BR, Time-Zone, Default-Gateway
Domain- Name, Domain-Name-Server, Hostname
Client- ID Option 61, length 20: hardware-type 255, 00:00:00: 00:00:02: 00:00:02: c9:00:f4: 52:14:03: 00:33:d1: 91
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request, length 300, htype 32, hlen 0, xid 0x52bc6268, secs 17, Flags [none] (0
x0000)
Magic Cookie 0x63825363
END Option 255, length 0
PAD Option 0, length 0, occurs 19