Thanks for all the help and advice all sorted (except the MX record which the router does not appear to support even in the CLI) the 7.x CLi commands appears to be generally the same for V8 routers....
For my and others reference heres what I did to get OpenDNS web filtering working with their DNS-O-Matic dyndns client updating my IP address from the router. This is made up from bits I have pulled together from various websites, forums and the CLI guide, some of the DNS stuff appears in the Plusnet library. But it worked for me so hopefully it will for others if needed.....
1) login to telnet on the router
2) Issue the following commands (this part sets up the OpenDNS DNS servers in the router instead of the Plusnet servers)
dns server route list (make a note from the output of what your interface or "intf" is, mine was "Internet")
dns server route flush
dns server route add dns=208.67.222.222 metric=5 intf=Internet <or whatever you noted your intf as above>
dns server route add dns=208.67.220.220 metric=10 intf=Internet <or whatever you noted your intf as above>
The following 3 commands seem to be connected with removing and ensuring that the Plusnet servers are not re picked up on a reboot/reconnection and were shown on a website I was looking at but all 3 gave errors on my router so I assume that my router may have had them hard coded in some way I did them just in case though.
dhcp client ifdetach intf=Internet
dhcp client rqoptions delete intf=Internet option=domain-name-servers
dhcp client ifattach intf=Internet
To check your new servers are set up do this command next - the 208.... servers should be shown
dns server route list
To save the config you MUST do this command
saveall
To use the DNS-O-Matic client to update from the router the IP address the web filtering is expecting we need to change the config of the "custom" dyndns option in the web gui this command will set it up and give it a 3 hour update cycle.
dyndns service modify name=custom server=updates.dnsomatic.com updateinterval=10800
Now go to the web GUI and select the "custom" dyndns option, add you DNS-O-Matic login details (you need to have a DNS-O-Matic login to do this and have it set-up to update OpenDNS) i.e. username/password and in the host name field use "all.dnsomatic.com". Enable this on the internet interface and apply the change. Router should show as update successful, DNS-O-Matic should show your current IP address and 3 or so minutes later your OpenDNS web filtering should be working again as per your preset preferences.
Re the static route addition this is done by....
In telnet again do the following commands:
ip rtlist (this shows your current routing table)
ip rtadd dst=n.n.n.n/mm gateway=g.g.g.g static=enabled status=up metric=0 (this adds the new "static" route - see notes below)
ip rtlist (this shows your current routing table - should now show you new route)
To save the config you MUST do this command
saveall
Notes - n.n.n.n is the host or network IP address followed by the subnet mask as a /mm [number of subnet bits] suffix i.e. a single host would be for example 192.168.0.230/32, a class C network (254 hosts/IP addresses to use) would be the network IP 192.168.1.0/24 etc.
g.g.g.g is the gateway IP address which the traffic for the network or hosts needs to be sent to.
Hope this helps others....
