help with custom option request in dhclient

[Tom Pusateri]

I have defined an encapsulated option and am requesting it in dhclient. However, I’m not seeing the request in a tcpdump trace of the request. I included other dhcp options in the request and they are present but not my custom one. Any ideas to what I’m doing wrong? hex 0017 and 0027 are the dhcp6.fqdn and dhcp6.name-servers options you can see in the tcpdump below but the length is 0004 so it’s not trying to add more options I don’t think.

dhclient.conf
————————————
option space foo;
option foo.first code 226 = ip6-address;
option foo.second code 227 = unsigned integer 16;
option foo.third code 228 = domain-list;
option foo.fourth code 229 = text;
option foo-encapsulation code 225 = encapsulate foo;

request dhcp6.fqdn, dhcp6.name-servers, foo.first, foo.second, foo.third;
——————————————————

I’ve also tried:
request dhcp6.fqdn, dhcp6.name-servers, foo-encapsulation with the same result.


# /usr/local/sbin/dhclient --version
isc-dhclient-4.4.1
# /usr/local/sbin/dhclient -v -d -1 -S -p 1067 -cf ./dhclient.conf -lf ./dhclient.leases -pf ./dhclient.pid en0

% tcpdump -i en0 -vvvv udp -s 1500 port 1067
tcpdump: listening on en0, link-type EN10MB (Ethernet), capture size 1500 bytes


15:50:42.915158 IP6 (flowlabel 0x92cce, hlim 1, next-header UDP (17) payload length: 40) butte-480.local.instl_boots > ff02::1:2.dhcpv6-server: [udp sum ok] dhcp6 inf-req (xid=7b23c6 (client-ID hwaddr type 1 784f434f30b5) (option-request DNS-server Client-FQDN) (elapsed-time 625))
	0x0000:  6009 2cce 0028 1101 fe80 0000 0000 0000
	0x0010:  1471 b2e9 a8fa 9e1b ff02 0000 0000 0000
	0x0020:  0000 0000 0001 0002 042b 0223 0028 cef1
	0x0030:  0b7b 23c6 0001 000a 0003 0001 784f 434f
	0x0040:  30b5 0006 0004 0017 0027 0008 0002 0271