OpenWRT DDNS

opkg install ddns-scripts luci-app-ddns

GUI: LuCI GUI, Services, Dynamic DNS

https://openwrt.org/docs/guide-user/services/ddns/client

Rough Notes

To get it to work properly, below is an example of a router with two WAN connections to the internet where both interfaces are behind other routers (IE, the router with the DDNS service has local IP Addresses assigned to its WAN interfaces);

config ddns 'global'
        option upd_privateip '1'
        option use_curl '1'

config service 'WhatEverService1'
        option enabled '1'
        option interface 'wan1'
        option service_name 'WhatEverService'
        option lookup_host 'WhatEverHost1'
        option username 'WhatEverUserName'
        option password 'WhatEverPassword'
        option domain 'WhatEverDomain2'
        option ip_source 'web'
        option ip_url 'https://domains.google.com/checkip'
        option bind_network 'wan1'
        option force_ipversion '1'

config service 'WhatEverService2'
        option enabled '1'
        option interface 'wan2'
        option service_name 'WhatEverService'
        option lookup_host 'WhatEverHost2'
        option username 'WhatEverUserName'
        option password 'WhatEverPassword'
        option domain 'WhatEverDomain2'
        option ip_source 'web'
        option ip_url 'https://domains.google.com/checkip'
        option bind_network 'wan2'
        option force_ipversion '1'

• Use the option use_curl '1' directive when using DDNS with a Dual WAN Router
• If the router with the DDNS functionality is behind another router (like a hotspot, etc.), then the following directives should be configured for proper functionality;
  • use_curl '1'
  • interface 'WhatEverInterface' (not the "ifconfig" or "ip a" name, but the OpenWRT Name found in the LuCI GUI, Network, Interfaces)*
  • ip_source 'web'
  • ip_url 'WhatEverServiceLikeGoogle'
  • bind_network 'WhatEverInterface' (not the "ifconfig" or "ip a" name, but the OpenWRT Name found in the LuCI GUI, Network, Interfaces)*
  • force_ipversion '1'
  • ...and his requires CURL be installed: opkg install curl

* In the above example, wan1 and wan2 are just place holders. In real world circumstances, wan, wwan, etc. would be used, NOT eth1.2

The OpenWRT documentation states WGET is used by default, but for dual WAN routers, make sure the above noted use_curl directive is set.

Some good hints came from here: https://github.com/openwrt/packages/issues/8277

DDNS and BIND (IE, ditching a service like DynDNS)

opkg update

opkg install wget curl bind-client bind-host ddns-scripts_nsupdates

https://openwrt.org/docs/guide-user/services/ddns/client

https://bind9.readthedocs.io/en/v9_16_5/advanced.html

https://bind9.readthedocs.io/en/v9_16_5/manpages.html#man-nsupdate

Nice example, but without using the OpenWRT DDNS service (uses a custom script): https://www.foell.org/justin/diy-dynamic-dns-with-openwrt-bind/

https://www.leurent.eu/wiki/FAQ:OpenWRT