Have to start out by saying, this will have to take place on the router. I looked into the camera, but it simply seems to be too manufacturer set to be able to run a crack that complex on. Perhaps if you did some firmware replacement you could manage, but not simply.
With your particular router, it appears that you can. I don't actually have your router, so I could be reading the documentation wrong, but it appears that you should be able to. IF I'm reading right, follow these steps: (adapted from cosmote documentation)
- Go under
Internet > Security > Filter Criteria.
- Select the radio button
- Type in any name and the IP of your camera and Apply.
IP filter - IPV4 to open the IPV4 filters page.
- Edit the settings under Destination IP and Source IP range to match your requirements.
I could be wrong, but that appears to be the method. :) You might have to apply multiple rules to rule out all but the IP's you want: I'm not sure.
If you are unable to block all traffic except the IP you want on your router, the answer is, no, it is not possible, short of buying a new router.
Hope it works!