Here are some settings in case you need these.

IP Address: "Server Assigned"
Subnet Mask: "255.255.255.0"
Gateway Add: "0.0.0.0"

Network	Primary DNS	Secondary DNS
te	205.199.193.2	205.137.48.7
qw	63.226.138.15	216.111.65.217
uu	198.6.1.218	198.6.100.218
st	216.126.128.40	216.126.136.250
fi	216.126.128.40	216.126.136.250
ip	216.126.128.40	216.126.136.250
wn	206.15.168.70	206.15.168.65
el	209.63.0.2	207.173.86.2

Listed below are some links to some walk-throughs of Mac's made available on other ISP's websites. Perhaps these can help.

IMAC - Configuration