Hey sara.

The difference between a modem and a router is important: a modem is a device that allows you to connect to the internet and, roughly, a router is a modem with a built-in firewall.
If it is a router you're having (I don't think that this is the case) then this needs to be configured too.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

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