[FS#3609] odhcpd: doesn't set M flag nor O flag in router advertisment when using isc-dhcp-server-ipv6 (Attachment added)

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User who did this - Ronan LE MEILLAT (eltorio) 

Attached to Project - OpenWrt/LEDE Project
Summary - odhcpd: doesn't set M flag nor O flag in router advertisment when using isc-dhcp-server-ipv6
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Hi,
On OpenWRT 19.07.6 on a TP-Link Archer C7 AC1750 v5 connecting a small site to Internet and to other corporate subnets via an IPSEC tunnel for IPv4 and a 6in4 tunnel (inside the ipsec tunnel for IPv6)

I 'd like to use isc bind9 and dhcp server for both ipv4 and ipv6 (for having advanced features) in replacement of dnsmasq/odhcpd
I remove dnsmasq but let odhcpd because radvd is not available in current version

My router establish automatically an IPSEC tunnel to a main site and in this tunnel use a 6in4 tunnel for provinding IPv6 to the "openwrt" site
I also put a static address for lan ipv6 and 6in4 tunnel

This is my network config
config interface 'loopback'
	option ifname 'lo'
	option proto 'static'
	option ipaddr '127.0.0.1'
	option netmask '255.0.0.0'

config globals 'globals'

config interface 'lan'
	option type 'bridge'
	option ifname 'eth0.1'
	option proto 'static'
	option netmask '255.255.255.0'
	option ipaddr '192.168.5.254'
	list ip6addr '2001:xxxx:xxxx:xxxx:200::254/72'
	list dns '127.0.0.1'

config interface 'wan'
	option ifname 'eth0.2'
	option proto 'dhcp'

config device 'wan_eth0_2_dev'
	option name 'eth0.2'
	option macaddr 'e4:xx:xx:xx:xx:33'

config interface 'wan6'
	option ifname 'eth0.2'
	option proto '6in4'
	option ipaddr '192.168.5.254'
	option ip6addr '2001:xxxx:xxxx:xxxx:aaab::2/112'
	option peeraddr '192.168.15.1'
	option ip6gw '2001:xxxx:xxxx:xxxx:aaab::1'

config switch
	option name 'switch0'
	option reset '1'
	option enable_vlan '1'
	option ar8xxx_mib_type '0'
	option ar8xxx_mib_poll_interval '500'

config switch_vlan
	option device 'switch0'
	option vlan '1'
	option ports '2 3 4 5 0t'

config switch_vlan
	option device 'switch0'
	option vlan '2'
	option ports '1 0t'

config route6
	option target '2000::/3'
	option gateway '2001:xxxx:xxxx:xxxx:aaab::1'
	option metric '100'
	option interface 'wan6'

config interface 'wwan'
	option proto '3g'
	option device '/dev/ttyUSB0'
	option service 'umts'
	option apn 'xxxx'
	option ipv6 '0'
	option delegate '0'

This is my IPSEC config
config 'ipsec'
	option 'debug' '2'
	option 'zone' 'vpn'

config 'remote' 'LxxxxxxS'
	option 'enabled' '1'
	option 'gateway' 'XXX.XXX.XXX.XXX'
	option 'local_identifier' 'cxxxxxxxxxxxxxxxxxm'
	option 'remote_identifier' 'xxxxxxxxxxxxxxxxxxxxxm'
	option 'authentication_method' 'psk'
	option 'pre_shared_key_old' '77xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxf'
	option 'pre_shared_key' '8xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx8e'
	list 'tunnel' 'vpn'
	list 'p1_proposal' 'pre_g2_aes_sha256'

config 'p1_proposal' 'pre_g2_aes_sha256'
	option 'encryption_algorithm' 'aes256'
	option 'hash_algorithm' 'sha256'
	option 'dh_group' 'modp2048'

config 'p2_proposal' 'g2_aes_sha256'
	option 'pfs_group' 'modp2048'
	option 'encryption_algorithm' 'aes256'
	option 'authentication_algorithm' 'sha256'

config 'tunnel' 'vpn'
        option 'local_subnet' '192.168.5.0/24'
        option 'remote_subnet' '192.168.15.0/24,192.168.168.0/24,192.168.92.0/24,192.168.2.0/24,192.168.115.0/24'
        option 'p2_proposal' 'g2_aes_sha256'

I config my /etc/config/dhcp like this

config dhcp 'lan'
        option interface 'lan'
        option start '100'
        option limit '150'
        option leasetime '12h'
        option ra 'server'
        option ra_mininterval '1'
        option ra_maxinterval '20'
        option ra_management '2'

**but odhcpd does not set M flag nor O flag**
I tried to add option ignore '1' without success
This is a screen capture of a Wireshark sniffing on the WiFi network {{http://i.ibb.co/QKK13Cn/107125841-6dc19980-68ac-11eb-94b9-bc932244974c.jpg}} also putted in attachement
Finally I attached my package list



One or more files have been attached.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3609

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