LEDE 17.01 - Multiple instances of dnsmasq not working

Installing and Using OpenWrt
1

Hey,

I have to use different dnsmasq settings for the two interfaces. So I try to start two instances of dnsmasq. Though I believe I configured everything according to the documentation, /etc/init.d/dnsmasq start will only start one instance of dnsmasq.

config dnsmasq 'dns_wan'
        list interface 'wan'
        option bind_dynamic '1'
        option domainneeded '1'
        option boguspriv '1'
        option filterwin2k '0'
        option localise_queries '1'
        option rebind_protection '1'
        option local '/wan/'
        option domain 'wan'
        option expandhosts '1'
        option authoritative '1'
        option readethers '1'
        option leasefile '/tmp/dhcp.leases'
        option resolvfile '/tmp/resolv.conf.auto'
        option nonwildcard '0'
        # DNS64
        list server '::1#5353'
        # This is important and has to be different from 'dns_lan'
        list server '/custom.tld/x.x.x.x'

config dnsmasq 'dns_lan'
        list interface 'lan'
        list notinterface 'lo'
        option bind_dynamic '1'
        option domainneeded '1'
        option boguspriv '1'
        option filterwin2k '0'
        option localise_queries '1'
        option rebind_protection '1'
        option local '/lan/'
        option domain 'lan'
        option expandhosts '1'
        option authoritative '1'
        option readethers '1'
        option leasefile '/tmp/dhcp-lan.leases'
        option resolvfile '/tmp/resolv-lan.conf.auto'
        option nonwildcard '0'
        # DNS64
        list server '::1#5353'

config dhcp 'lan'
        option instance 'lan_dns'
        option interface 'lan'
        option dhcpv6 'server'
        option ra 'server'
        option ra_default '1'
        option ra_management '0'
        option ignore '1'
        list dns '2001:db8:1234::1'

config dhcp 'wan'
        option instance 'wan_dns'
        option interface 'wan'
        option ignore '1'
        option ra 'server'
        option ra_default '1'
        option ra_dns '0'

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

logread complains about the port being in use.

failed to create listening socket for port 53: Address in use

Do you see something obvious missing?

2

Both instances are listening in the same local port for IPv6.

3

Any reason why you are sticking to 17.01 instead of using a more recent release?

4

Yes. But they should listen on different interfaces. Even though I set option interface. However, this somehow isn't honored if you also set option nonwildcard '0'. This was the problem. After setting this to '1' it works now.

Yes: 18.06 is too big and power-hungry for my WR841N. I'm using the most current snapshot however and also with some custom backports or updated versions of packages (e.g. odhcpd is built from a newer commit in 2019 to support option ra_dns).

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5

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