r299512 breaks dhclient on some networks

Ian FREISLICH ian.freislich at capeaugusta.com
Wed May 18 22:49:05 UTC 2016


Hi

I cannot for the life of me figure out why the change in r299512 breaks
DHCP on one network I use but not on another network.
 
The only clue I can find is that the request whose response is ignored
has the following client ID:
1:6:0:22:5f:70:a1:df

The request whose response is use has this client ID:
1:0:22:5f:70:a1:df

Here's a dhcpdump of the request/offer that gets ignored.

---------------------------------------------------------------------------

  TIME: 2016-05-18 18:46:39.134
    IP: 0.0.0.0 (00:22:5f:70:a1:df) > 255.255.255.255 (ff:ff:ff:ff:ff:ff)
    OP: 1 (BOOTPREQUEST)
 HTYPE: 1 (Ethernet)
  HLEN: 6
  HOPS: 0
   XID: 92a34fc3
  SECS: 0
 FLAGS: 0
CIADDR: 0.0.0.0
YIADDR: 0.0.0.0
SIADDR: 0.0.0.0
GIADDR: 0.0.0.0
CHADDR: 00:22:5f:70:a1:df:00:00:00:00:00:00:00:00:00:00
 SNAME: .
 FNAME: .
OPTION:  53 (  1) DHCP message type         1 (DHCPDISCOVER)
OPTION:  61 (  8) Client-identifier         01:06:00:22:5f:70:a1:df
OPTION:  12 (  3) Host name                 zen
OPTION:  55 (  9) Parameter Request List      1 (Subnet mask)
                                             28 (Broadcast address)
                                              2 (Time offset)
                                            121 (Classless Static Route)
                                              3 (Routers)
                                             15 (Domainname)
                                              6 (DNS server)
                                             12 (Host name)
                                            119 (Domain Search)
                                           
---------------------------------------------------------------------------

  TIME: 2016-05-18 18:46:39.134
    IP: 10.0.0.1 (4c:5e:0c:62:4f:82) > 10.0.0.80 (00:22:5f:70:a1:df)
    OP: 2 (BOOTPREPLY)
 HTYPE: 1 (Ethernet)
  HLEN: 6
  HOPS: 0
   XID: 92a34fc3
  SECS: 0
 FLAGS: 0
CIADDR: 0.0.0.0
YIADDR: 10.0.0.80
SIADDR: 10.0.0.1
GIADDR: 0.0.0.0
CHADDR: 00:22:5f:70:a1:df:00:00:00:00:00:00:00:00:00:00
 SNAME: .
 FNAME: .
OPTION:  53 (  1) DHCP message type         2 (DHCPOFFER)
OPTION:  54 (  4) Server identifier         10.0.0.1
OPTION:  51 (  4) IP address leasetime      259200 (3d)
OPTION:   1 (  4) Subnet mask               255.255.255.0
OPTION:   3 (  4) Routers                   10.0.0.1
OPTION:   6 (  4) DNS server                10.0.0.1
---------------------------------------------------------------------------


And here's the request/offer that works (with the r299512 backed out)

---------------------------------------------------------------------------

  TIME: 2016-05-18 18:35:33.817
    IP: 10.0.0.220 (00:22:5f:70:a1:df) > 255.255.255.255 (ff:ff:ff:ff:ff:ff)
    OP: 1 (BOOTPREQUEST)
 HTYPE: 1 (Ethernet)
  HLEN: 6
  HOPS: 0
   XID: 866cfd85
  SECS: 4
 FLAGS: 0
CIADDR: 0.0.0.0
YIADDR: 0.0.0.0
SIADDR: 0.0.0.0
GIADDR: 0.0.0.0
CHADDR: 00:22:5f:70:a1:df:00:00:00:00:00:00:00:00:00:00
 SNAME: .
 FNAME: .
OPTION:  53 (  1) DHCP message type         3 (DHCPREQUEST)
OPTION:  50 (  4) Request IP address        10.0.0.220
OPTION:  61 (  7) Client-identifier         01:00:22:5f:70:a1:df
OPTION:  12 (  3) Host name                 zen
OPTION:  55 (  9) Parameter Request List      1 (Subnet mask)
                                             28 (Broadcast address)
                                              2 (Time offset)
                                            121 (Classless Static Route)
                                              3 (Routers)
                                             15 (Domainname)
                                              6 (DNS server)
                                             12 (Host name)
                                            119 (Domain Search)
                                           
---------------------------------------------------------------------------

  TIME: 2016-05-18 18:35:33.817
    IP: 10.0.0.1 (4c:5e:0c:62:4f:82) > 10.0.0.220 (00:22:5f:70:a1:df)
    OP: 2 (BOOTPREPLY)
 HTYPE: 1 (Ethernet)
  HLEN: 6
  HOPS: 0
   XID: 866cfd85
  SECS: 0
 FLAGS: 0
CIADDR: 0.0.0.0
YIADDR: 10.0.0.220
SIADDR: 10.0.0.1
GIADDR: 0.0.0.0
CHADDR: 00:22:5f:70:a1:df:00:00:00:00:00:00:00:00:00:00
 SNAME: .
 FNAME: .
OPTION:  53 (  1) DHCP message type         5 (DHCPACK)
OPTION:  54 (  4) Server identifier         10.0.0.1
OPTION:  51 (  4) IP address leasetime      259200 (3d)
OPTION:   1 (  4) Subnet mask               255.255.255.0
OPTION:   3 (  4) Routers                   10.0.0.1
OPTION:   6 (  4) DNS server                10.0.0.1
---------------------------------------------------------------------------



-- 
Ian Freislich


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