Question about DHCPv6 Lease Selection

John W. Blue john.blue at rrcic.com
Fri Jan 4 15:53:56 UTC 2019


And here is the advertise packet in question that is generating a score of zero.  Any thoughts as to why it got a zero?

Frame 13: 182 bytes on wire (1456 bits), 182 bytes captured (1456 bits)
Ethernet II, Src: Cisco_6d:28:d9 (e0:2f:6d:6d:28:d9), Dst: Vmware_ba:a7:4c (00:0c:29:ba:a7:4c)
Internet Protocol Version 6, Src: fe80::e22f:6dff:fe6d:28d9, Dst: fe80::20c:29ff:feba:a74c
User Datagram Protocol, Src Port: 547, Dst Port: 546
DHCPv6
    Message type: Advertise (2)
    Transaction ID: 0xc28475
    Client Identifier
        Option: Client Identifier (1)
        Length: 14
        Value: 0001000123bd8128000c29baa74c
        DUID: 0001000123bd8128000c29baa74c
        DUID Type: link-layer address plus time (1)
        Hardware type: Ethernet (1)
        DUID Time: Dec 31, 2018 19:38:48.000000000 Central Standard Time
        Link-layer address: 00:0c:29:ba:a7:4c
    Server Identifier
        Option: Server Identifier (2)
        Length: 14
        Value: 0001000155d45514f8bc123d6ca8
        DUID: 0001000155d45514f8bc123d6ca8
        DUID Type: link-layer address plus time (1)
        Hardware type: Ethernet (1)
        DUID Time: Aug 18, 2045 05:06:12.000000000 Central Daylight Time
        Link-layer address: f8:bc:12:3d:6c:a8
    DNS recursive name server
        Option: DNS recursive name server (23)
        Length: 32
        Value: 20010578003f0000000000000000001020010578003f0001...
         1 DNS server address: 2001:578:3f::10
         2 DNS server address: 2001:578:3f:1::10
    Identity Association for Non-temporary Address
        Option: Identity Association for Non-temporary Address (3)
        Length: 40
        Value: 29baa74c0000a8c000010e000005001820010579ff010100...
        IAID: 29baa74c
        T1: 43200
        T2: 69120
        IA Address
            Option: IA Address (5)
            Length: 24
            Value: 20010579ff01010028d37d19b1c2def60001518000015180
            IPv6 address: 2001:579:ff01:100:28d3:7d19:b1c2:def6
            Preferred lifetime: 86400
            Valid lifetime: 86400

From: dhcp-users [mailto:dhcp-users-bounces at lists.isc.org] On Behalf Of John W. Blue
Sent: Friday, January 04, 2019 9:38 AM
To: dhcp-users at lists.isc.org
Subject: Question about DHCPv6 Lease Selection

https://www.isc.org/wp-content/uploads/2017/08/dhcp43clientconf.html

"In the DHCPv6 protocol the client will wait a small amount of time to allow ADVERTISE messages from multiple servers to arrive."

If only one server responds and the dhclient gives it a score of zero, what options do you have to force to accept?
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