Two webcam servers on one router?

Possible Duplicate:
How do I set up more than one camera/DVR/service on one IP address?

Hi,
is it possible to have two webcam servers connected to one router and being administered separately by DynDNS?
I have a Siemens C2-010-I router, currently being linked to DynDNS. In the config file for the router, the port forwarding for the webcam server is linked to the IP address of the webcam server:

create nat rule entry ruleid 4 rdr lcladdrfrom 192.168.1.xxx lcladdrto 192.168.1.xxx destportfrom num 80 destportto num 80 lclport num 80

But the connection to DynDNS is made by:

create ddns hostname ifname ppp-0 name http://abc.ath.cx
create ddns intf ifname ppp-0 srvcname dyndns username "12345" passwd thispassword wildcard enable

where ppp-0 stands for PPOE (I believe).