bootreply always-broadcast

[Kernel Jake]

dhcpd V3.0.5 on FreeBSD 6.2 is not returning a broadcast BOOTREPLY to a 
Cisco PowerConnect 3524 switch.
The following is the BOOTREQUEST packet.  The client sets the broadcast flag.

  TIME: 08:33:12.432175
    IP:> (00:1e:4f:09:af:71)>  (ff:ff:ff:ff:ff:ff)
    OP: 1 (BOOTPREQUEST)
 HTYPE: 1 (Ethernet)
  HLEN: 6
  HOPS: 0
   XID: 52525230
  SECS: 120
 FLAGS: 7f80 (wireshark says 0x8000, dhcpdump says 0x7f80)
CIADDR: 0.0.0.0
YIADDR: 0.0.0.0
SIADDR: 0.0.0.0
GIADDR: 0.0.0.0
CHADDR: 00:1e:4f:09:af:71:00:00:00:00:00:00:00:00:00:00
 SNAME: .
 FNAME: .
OPTION:  12 ( 17) Host name                 PowerConnect 3524

If I use a pool of dynamic bootp addresses as specified in the following block,
then the BOOTREPLY packet is sent the to the ethernet broadcast address 
correctly, and the client accepts the reply.

subnet 192.168.2.0 netmask 255.255.255.0 {
  range dynamic-bootp 192.168.2.160 192.168.2.170;
  option routers 192.168.2.1;
}

  TIME: 08:33:12.433487
    IP:> (00:30:48:5e:6f:18)>  (ff:ff:ff:ff:ff:ff)
    OP: 2 (BOOTPREPLY)             ^^^^^^^^^
 HTYPE: 1 (Ethernet)
  HLEN: 6
  HOPS: 0
   XID: 52525230
  SECS: 120
 FLAGS: 7f80
CIADDR: 0.0.0.0
YIADDR: 192.168.2.170
SIADDR: 0.0.0.0
GIADDR: 0.0.0.0
CHADDR: 00:1e:4f:09:af:71:00:00:00:00:00:00:00:00:00:00
 SNAME: .
 FNAME: .
OPTION:   1 (  4) Subnet mask               255.255.255.0
OPTION:   3 (  4) Routers                   192.168.2.1


However, if I use a group with fixed addresses, then the BOOTREPLY packet 
is sent to the unicast address of the client, and the client ignores the reply.

subnet 192.168.2.0 netmask 255.255.255.0 { }
group dell {
  option routers 192.168.2.1;
  host dell01 { hardware ethernet 00:1E:4F:09:AF:71; 
          fixed-address 192.168.2.160; always-broadcast on; }
}


  TIME: 08:32:22.633798
    IP:> (00:30:48:5e:6f:18)>  (00:1e:4f:09:af:71)
    OP: 2 (BOOTPREPLY)              ^^^^^^^^^^^
 HTYPE: 1 (Ethernet)
  HLEN: 6
  HOPS: 0
   XID: 52525230
  SECS: 70
 FLAGS: 7f80
CIADDR: 0.0.0.0
YIADDR: 192.168.2.160
SIADDR: 192.168.2.1
GIADDR: 0.0.0.0
CHADDR: 00:1e:4f:09:af:71:00:00:00:00:00:00:00:00:00:00
 SNAME: .
 FNAME: .
OPTION:   1 (  4) Subnet mask               255.255.255.0
OPTION:   3 (  4) Routers                   192.168.2.1

The dhcpd.conf manpage says that the relevant scope for always-broadcast
is a conditional statement, parameter for a class, or as a parameter for a 
host declaration.  What is going wrong?

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