Knoppix generally gets the setup by dhcp from the router and works fine. It might be helpful if you define what isn't working; as we have seen some reports of DNS server problems with firefoxc/iceweasel when the ISP is trying to support IPv6 (disabling IPv6 in the browser usually resolves this). There have also been reports of IPv4/IPv6 issues when the ISP assigned DNS servers are improperly configured (in this case you can ping an Internet address by IP address but not by URL).

Giving the output of ifconfig may help. In general the broadcast address will be 192.168.x.255, but this really is interdependent on the net mask (and, of course, the assigned local IP address).

And I'm assuming you are trying to get a wired connection working, not wireless, although I found that part of your post somewhat confusing.