https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=4567
--- Comment #2 from Hadar Shoham <hadar@xxxxxx> 2010-03-10 05:43:17 PST ---
(In reply to comment #1)
> According to RFC3925 the V-I Vendor Class option must contain a
> enterprise-number, and this capture does not seem to have this.
hi,
according to RFC3925, you are correct there is a need to have enterprise-number
but according to CableLab documentation (CL-SP-CANN-DHCP-Reg-I03-090811) the
option is TLV only.I will send them a request for clarification of this.
(from the document - paragraph 4.4.2D HCPv4 CableLabs IP addressing mode
preference DHCP Option)
This DHCP Option is provided to Cable Modems in IPv4 mode when they are
provided with DHCPv4 server addresses (using DHCP option 122) and DHCPv6
DSS_IDs (using CL_V4OPTIONCCC_V6) to be relayed to embedded PacketCable devices
that support dual-stack operations. It indicates a preference for the desired
mode of operation, i.e., IPv4 or IPv6.
This option has the following format:
0 1 2
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| option-code | option-length | option-value |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
option-code (1 octet) : CL_V4OPTION_IP_PREF (124)
option-length (1 octet) : 1
option-value (1 octet) : 1 - indicates IPv4, 2 - indicates IPv6.
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