DHCPv6 option 54 and 55

Durga · July 11, 2019, 6:40am

we envisage to use openwrt based system as dhcp client for Ipv6 using odchcp6c and in that there is a requirement to send Info DHCP Info request with Option 54 (OPTION-IPv6_Address-MoS) and 55 (OPTION-IPv6_FQDN-MoS) , and while looking into that code of odhcp6c , sensed its not supported , hence wish to check with the forum to look into possibility of supporting the same

trendy · July 11, 2019, 9:22am

odhcp6c -h
...
        -r <options>    Options to be requested (comma-separated)
        -R              Do not request any options except those specified with -r

github.com

openwrt/odhcp6c/blob/master/README

odhcp6c - Embedded DHCPv6 Client


** Abstract **

odhcp6c is a minimal DHCPv6 and RA-client for use in embedded Linux systems
especially routers. It compiles to only about 35 KB (-Os -s).


** Features **

1. IPv6 bootstrap from different environments with autodetection
	a) RA only
	b) RA + stateless DHCPv6
	c) RA + stateful DHCPv6 (either IA_NA or IA_PD or both)

2. Handling of non-temporary addresses (IA_NA)
	a) handling of valid and preferred lifetimes
	b) automatic fallback to stateless or PD-only mode

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OPTION_ Custom option received as base-16

Durga · July 11, 2019, 9:56am

I see, there is no internal source code level support to specify this DHCPv6 option 54 and 55. can you please comment on this?

trendy · July 11, 2019, 10:33am

Nope, cause I am not a developer. Have you tried to add these options as arguements and it didn't work?

anon45274024 · July 11, 2019, 10:46am

Maybe a better bet would be the devel mailing list, or if you can send a patch, else https://openwrt.org/packages/pkgdata/odhcp6c pointing to https://bugs.openwrt.org for lodging a bug (incl. feature request)

Durga · July 11, 2019, 4:00pm

I will try it