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setting DDNS update-key? (non-HTTP method)

Hi everyone

Platfom: CISCO881-SEC-K9, 15.2(4)M3

I've been doing DDNS with DynDNS and the HTTP method for a while, for the obvious purposes like remote access, file access, ssh access, proxying while abroad etc.

Since I am already hosting my own DNS Servers (BIND) out in the internet, I thought of sending a proper ITEF style DDNS update to a subdomain of mine, to have an updated A Record in my DNS zones that I could use.

While BIND name server can be configured to allow updates from a given (set of) IP adresse(s) or ranges, I can't rely on a dynamic IP for security, what with with my DSL connection and it's dynamic public IP.

BIND however has the concept of the update-key (see http://answers.oreilly.com/topic/192-how-to-allow-dynamic-updates-with-bind/ ) which just basically is a properly long shared secret.

I just can't figure out how and where to set this key when configuring as follows:

ip ddns update method SUB.MYDOMAIN.COM-DDNS

DDNS

interval maximum 7 0 0 0

interval minimum 0 6 0 0

interface FastEthernet4

...

ip address dhcp

...

ip ddns update hostname 6333.sub.mydomain.com

ip ddns update SUB.MYDOMAIN.COM-DDNS

...

Note: I do not want to update DNS with my router's hostname and not via DHCP&DNS Services of my ISP, hence I'm not using the

ip dhcp client update dns interface command, as suggested by http://www.cisco.com/en/US/docs/ios-xml/ios/ipaddr_dns/configuration/15-mt/dns-dyn-dns-supp-ios.html ).

I woul assume that I need to define a keyring of sorts, but I failed to find any (sub)command that woul allow to specify a keyring for DDNS.

Thanks for your thoughts and ideas

Marc

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