CableLabs Vendor Specific Option not in Relay-Reply message

Cheng Ching-Ho-LCC014 Ching-Ho.Cheng at
Thu Sep 30 14:22:43 UTC 2010

I have enclosed the dhcpd6.conf for reference.  I hope that this could
help to determine my DHCPv6 server problem :
#Define the options:

option space docsis code width 2 length width 2;

option vsio.docsis code 4491 = encapsulate docsis;

option docsis.tftp-servers code 32 = array of ip6-address;

option docsis.cablelabs-configuration-file code 33 = text;

option docsis.cablelabs-syslog-servers code 34 = array of ip6-address;

option docsis.device-id code 36 = string;

option docsis.time-servers code 37 = array of ip6-address;

option docsis.time-offset code 38 = signed integer 32;

#Configure global options:

option docsis.cablelabs-configuration-file "basic.bin";

option docsis.cablelabs-syslog-servers 2000:300::2;

option docsis.tftp-servers 2000:300::2;

option docsis.time-servers 2000:300::2;

option docsis.time-offset 0;

option dhcp6.rapid-commit;

# lease-time information: default = 30 minutes, max = 120 minutes

#default-lease-time 864000;

#max-lease-time 864000;

default-lease-time 1800;

max-lease-time 1800;

# modem configuration file name:

#filename "basic.bin";

ddns-update-style ad-hoc;


    subnet6 2000:300::/64 {

            range6 2000:300::/64;


# Goldie Subnet 

shared-network "goldie_1" {

        option docsis.cablelabs-configuration-file "goldie_1.bin";

        subnet6 2001:100:101::/64 {

                range6 2001:100:101::/64;




Ching-Ho Cheng


From: at
[ at] On Behalf
Of Cheng Ching-Ho-LCC014
Sent: Wednesday, September 29, 2010 2:01 PM
To: Users of ISC DHCP
Subject: CableLabs Vendor Specific Option not in Relay-Reply message


I upgraded the DHCP server to 4.1.x from 4.0.x. Now, in DHCPv6
relay-reply message from ISC server, there is no CableLabs vendor
specific options included. IPv6 modem could not register due to the
missing TFTP/config file information within the CableLabs vendor option.

I was using the same dhcpd6.conf as in 4.0.x. Any suggestion is


Ching-Ho Cheng
Motorola Inc.
Mobile Devices & Home
Phone: 508-786-7522
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