Open DNS
DNS powers the web and quite often is the first service to fail on ISPs. Sadly this has been happening with O2 Broadband via 94.192.119.253 and as such I've resorted to making use of OpenDNS.
If you'd prefer to not setup the DNS entries manually on each client ( current settings are 208.67.222.222 and 208.67.222.220 ) then you'll need to use the following for the Thompson supplied O2 routers 1 2.
telnet 192.168.1.254
Login name: SuperUser
Password: O2Br0ad64nd
dns server route flush
dns server route add dns=208.67.222.222 metric=0 intf=O2_ADSL2plus
dns server route add dns=208.67.220.220 metric=0 intf=O2_ADSL2plus
dns server route list
saveall
Open DNS does seem to be a lot more reliable than O2's DNS making for a much happier, speedier and reliable connection.