OpenDNS is update by SSL/TLS (https) with the following URL:
OpenWRT doesn't ship with curl used to update HTTPS sources, so we need to install that.
[email protected]:~# opkg update [email protected]:~# opkg install curl
Now we need to download the latest Certificate Authority bundle. Such a bundle is in the PEM format and can be downloaded from http://curl.haxx.se/ca/cacert.pem.
[email protected]:~# mkdir -p /etc/ssl/certs/ [email protected]:~# wget -P /etc/ssl/certs/ http://curl.haxx.se/ca/cacert.pem
More in depth information can be obtain at the OpenWRT wiki page for DDNS.