OpenWrt wan interface unable to set dns

ybm · March 19, 2019, 2:41pm

using NETGEAR WNDR3700v4 , OpenWrt 18.06.2 r7676
when uncheckd "Use DNS servers advertised by peer" and input 8.8.8.8 in "Use custom DNS servers", my wan interface's IP address will disappear. Even use of restart interface button or reboot, also dont work.
Need to restore config from backup file or reset config.
below use of wan6 interface for demo.

I try to setup google dns in "interface > lan > DHCP server > advanced settings > DHCP-Options" and ipv6 "interface > lan > DHCP server > IPv6 setting > Announced DNS servers".
but in status page > overview > Network > IPv4 Upstream or IPv6 Upstream, the dns list out is come from ISP, not from google.

thanks for your help.

vgaetera · March 19, 2019, 2:46pm

https://openwrt.org/docs/guide-user/base-system/dhcp_configuration#upstream_dns_provider

ybm · March 19, 2019, 2:59pm

here is the result try to config dns in wan interface

trendy · March 19, 2019, 4:12pm

Can you post the content of the config?
cat /etc/config/network ; cat /etc/config/dhcp ; cat /etc/config/firewall

ybm · March 19, 2019, 4:37pm

root@OpenWrt:~# cat /etc/config/network ; cat /etc/config/dhcp ; cat /et
c/config/firewall

config interface 'loopback'
        option ifname 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config globals 'globals'
        option ula_prefix 'fd1d:d3f8:de16::/48'

config interface 'lan'
        option type 'bridge'
        option ifname 'eth0.1'
        option proto 'static'
        option ipaddr '192.168.1.1'
        option netmask '255.255.255.0'
        option ip6assign '60'
        option stp '1'
        option igmp_snooping '1'

config device 'lan_dev'
        option name 'eth0.1'
        option macaddr 'c4:04:15:8b:93:38'

config interface 'wan'
        option ifname 'eth0.2'
        option proto 'dhcp'
        option peerdns '0'
        option dns '8.8.8.8'
        option clientid 'root'

config device 'wan_dev'
        option name 'eth0.2'
        option macaddr 'c4:04:15:8b:93:39'

config interface 'wan6'
        option ifname 'eth0.2'
        option proto 'dhcpv6'

config switch
        option name 'switch0'
        option reset '1'
        option enable_vlan '1'

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

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


config dnsmasq
        option domainneeded '1'
        option localise_queries '1'
        option rebind_protection '1'
        option rebind_localhost '1'
        option local '/lan/'
        option domain 'lan'
        option expandhosts '1'
        option authoritative '1'
        option readethers '1'
        option leasefile '/tmp/dhcp.leases'
        option resolvfile '/tmp/resolv.conf.auto'
        option nonwildcard '1'
        option localservice '1'

config dhcp 'lan'
        option interface 'lan'
        option start '100'
        option limit '150'
        option leasetime '12h'
        option dhcpv6 'server'
        option ra 'server'
        list dhcp_option '6,1.1.1.1,8.8.8.8'
        option ra_management '1'
        option ra_default '1'
        list dns '2606:4700:4700::1111'
        list dns '2001:4860:4860::8888'

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'


config defaults
        option syn_flood '1'
        option input 'ACCEPT'
        option output 'ACCEPT'
        option forward 'REJECT'
        option drop_invalid '1'

config zone
        option name 'lan'
        list network 'lan'
        option input 'ACCEPT'
        option output 'ACCEPT'
        option forward 'ACCEPT'

config zone
        option name 'wan'
        list network 'wan'
        list network 'wan6'
        option input 'REJECT'
        option output 'ACCEPT'
        option forward 'REJECT'
        option masq '1'
        option mtu_fix '1'

config forwarding
        option src 'lan'
        option dest 'wan'

config rule
        option name 'Allow-DHCP-Renew'
        option src 'wan'
        option proto 'udp'
        option dest_port '68'
        option target 'ACCEPT'
        option family 'ipv4'

config rule
        option name 'Allow-Ping'
        option src 'wan'
        option proto 'icmp'
        option icmp_type 'echo-request'
        option family 'ipv4'
        option target 'ACCEPT'

config rule
        option name 'Allow-IGMP'
        option src 'wan'
        option proto 'igmp'
        option family 'ipv4'
        option target 'ACCEPT'

config rule
        option name 'Allow-DHCPv6'
        option src 'wan'
        option proto 'udp'
        option src_ip 'fc00::/6'
        option dest_ip 'fc00::/6'
        option dest_port '546'
        option family 'ipv6'
        option target 'ACCEPT'

config rule
        option name 'Allow-MLD'
        option src 'wan'
        option proto 'icmp'
        option src_ip 'fe80::/10'
        list icmp_type '130/0'
        list icmp_type '131/0'
        list icmp_type '132/0'
        list icmp_type '143/0'
        option family 'ipv6'
        option target 'ACCEPT'

config rule
        option name 'Allow-ICMPv6-Input'
        option src 'wan'
        option proto 'icmp'
        list icmp_type 'echo-request'
        list icmp_type 'echo-reply'
        list icmp_type 'destination-unreachable'
        list icmp_type 'packet-too-big'
        list icmp_type 'time-exceeded'
        list icmp_type 'bad-header'
        list icmp_type 'unknown-header-type'
        list icmp_type 'router-solicitation'
        list icmp_type 'neighbour-solicitation'
        list icmp_type 'router-advertisement'
        list icmp_type 'neighbour-advertisement'
        option limit '1000/sec'
        option family 'ipv6'
        option target 'ACCEPT'

config rule
        option name 'Allow-ICMPv6-Forward'
        option src 'wan'
        option dest '*'
        option proto 'icmp'
        list icmp_type 'echo-request'
        list icmp_type 'echo-reply'
        list icmp_type 'destination-unreachable'
        list icmp_type 'packet-too-big'
        list icmp_type 'time-exceeded'
        list icmp_type 'bad-header'
        list icmp_type 'unknown-header-type'
        option limit '1000/sec'
        option family 'ipv6'
        option target 'ACCEPT'

config rule
        option name 'Allow-IPSec-ESP'
        option src 'wan'
        option dest 'lan'
        option proto 'esp'
        option target 'ACCEPT'

config rule
        option name 'Allow-ISAKMP'
        option src 'wan'
        option dest 'lan'
        option dest_port '500'
        option proto 'udp'
        option target 'ACCEPT'

config include
        option path '/etc/firewall.user'

lleachii · March 19, 2019, 5:19pm

Is there a reason for this?

ybm · March 19, 2019, 11:59pm

Success!!
It is chrome browser auto prefilled as username field, and outlook same as other fields. So dont aware it is invalid option.
Thanks.

system · March 29, 2019, 11:59pm

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