Originally Posted by meckano
When I worked for an Internet Service Provider (ISP), we had the same problem with some modems; they needed an update of the firmware.
If you find the website for your modem, and they get to technical in english, post the link and I, and I am sure other people here, will give you our translation.
Other than that, I can be of no assistance.
:)
DNS is not a must. I am told it is a backup for the primary DNS that does the Dynamic Name Serving service. (I think that is correctly stated.)