Ubuntu
isc-dhcp package

  1. Bug #1529815
  2. Comment #11

Comment 11 for bug 1529815

Revision history for this message
Rafael David Tinoco (rafaeldtinoco) wrote :

## 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