[Bug 1937110] [NEW] dhcp option 121 & 249

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Matthieu Clemenceau (mclemenceau):

Hello,

I'm running into issues with subiquity on a cloud provider.  The cloud
provider is using an on-link L3 gateway.


His DHCP response looks like this:


OPTION:  53 (  1) DHCP message type         5 (DHCPACK)
OPTION:  54 (  4) Server identifier         172.31.1.1
OPTION:  51 (  4) IP address leasetime      86400 (24h)
OPTION:   1 (  4) Subnet mask               255.255.255.255
OPTION:   3 (  4) Routers                   172.31.1.1
OPTION:   6 ( 12) DNS server                ....
OPTION: 121 ( 14) Classless Static Route    20ac1f0101000000  .......
					    0000ac1f0101     ......
OPTION: 249 ( 14) MSFT - Classless route    20ac1f0101000000  .......
					    0000ac1f0101     ......


Im booting the subiquity process with an patched ipxe (https://github.com/ipxe/ipxe/pull/104) like this:

#!ipxe
kernel .../vmlinuz initrd=initrd root=/dev/ram0 ramdisk_size=1500000 ip=dhcp url=https://cdimage.ubuntu.com/ubuntu-server/focal/daily-live/current/focal-live-server-amd64.iso autoinstall ds=nocloud-net;s=.../...-ad-78/ cloud-config-url=/dev/null
initrd .../initrd
boot

initrd/vmlinuz is extracted right out of focal-live-server-amd64.iso

Sadly subiquity is stuck with a broken network (because of missing dhcp
option 121/249 support). It happens when its running the /init from the
kernel right after kernel is booted, i guess even before the subiquity
is started(?).

After further debugging, it looks like the provided kernel 5.4.80 #90
Ubuntu, is using busybox 1.30.1-4ubuntu~6.3 which includes isc-
dhclient-4.4.1 which is lacking the given options.


Would be awesome if this could be fixed.. maybe just a simple busybox compile option?

** Affects: subiquity
     Importance: Undecided
         Status: New

** Affects: isc-dhcp (Ubuntu)
     Importance: High
     Assignee: Steve Langasek (vorlon)
         Status: Fix Released

** Affects: isc-dhcp (Ubuntu Jammy)
     Importance: High
     Assignee: Steve Langasek (vorlon)
         Status: Incomplete


** Tags: foundations-todo fr-2416
-- 
dhcp option 121 & 249
https://bugs.launchpad.net/bugs/1937110
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