How to prohibit broadcasting ipv6 dns after enabling ipv6

Installing and Using OpenWrt Network and Wireless Configuration
1 

config dnsmasq
	option domainneeded '1'
	option localise_queries '1'
	option rebind_protection '1'
	option rebind_localhost '1'
	option domain 'lan'
	option expandhosts '1'
	option authoritative '1'
	option readethers '1'
	option leasefile '/tmp/dhcp.leases'
	option resolvfile '/tmp/resolv.conf.d/resolv.conf.auto'
	option localservice '1'
	option local '/lan/'
	list server '/#/2001:da8::666#53'

config dhcp 'lan'
	option interface 'lan'
	option start '100'
	option limit '150'
	option dhcpv6 'server'
	option ra 'server'
	option ra_slaac '1'
	option ra_useleasetime '0'
	option ra_lifetime '600'
	option ra_mininterval '200'
	option ra_maxinterval '600'
	list ra_flags 'managed-config'
	list ra_flags 'other-config'
	option ra_management '0'
	option leasetime '11m'

config dhcp 'wan'
	option interface 'wan'
	option ignore '1'

config odhcpd 'odhcpd'
	option maindhcp '0'
	option leasefile '/tmp/hosts/odhcpd'
	option leasetrigger '/usr/sbin/odhcpd-update'
	option loglevel '4'

I don’t want the following clients to get ipv6 dns, how to set it up, prohibit dhcp broadcasting ipv6 dns, I can do this on er-x, but I don’t know how to set it on openwrt.

1 Like
2

You can try to advertise the same IPv4 DNS via both dnsmasq and odhcpd.

3 
config dhcp 'lan'
	option interface 'lan'
	option start '100'
	option limit '150'
	option leasetime '11m'
4 
Connect to a specific DNS suffix.......: Lan
    IPv6 address..........: 2009:33d:9ae9:be00::109
    IPv6 address..........: 2009:33d:9ae9:be00:d469:6f61:a8f5:6d17
    IPv6 address..........: 2009:33d:9aeb:be00:d469:6f61:a8f5:6d17
    Temporary IPv6 address........: 2009:33d:9ae9:be00:493f:a6c3:e589:134a
    Temporary IPv6 address........: 2009:33d:9aeb:be00:40d9:85da:7abe:8061
    Link local IPv6 address...: fe80::d469:6f61:a8f5:6d17%20
    IPv4 address...........: 192.168.6.109
    Subnet mask............: 255.255.255.0
    Default gateway...........: Fe80::5e85:7eff:fe41:927e%20
                                        192.168.6.1

It still doesn’t work. Pushing new ipv6 is ranked at the bottom, but not at the top, so you still can’t access the Internet through ipv6.

    IPv6 address..........: 2009:33d:9aeb:be00:d469:6f61:a8f5:6d17
    Temporary IPv6 address........: 2009:33d:9aeb:be00:40d9:85da:7abe:8061

It is the ipv6 obtained after the router restarts, but it ranks at the bottom instead of becoming the first choice.

5

Isn't this about IPv6 DNS?
How is that related to IPv6 addresses?
Or, do you mean DHCPv6?

1 Like
6

I thought you were trying to disable this...

Disregard my instructions, then.