Troubleshooting Wired Network Connection Issues Flowchart
Local IP Addresses
Firewall / Router / Gateway: examples are 10.0.0.1, 192.168.1.1, 192.168.254.1
Modem: examples are 10.0.0.1, 192.168.1.1, 192.168.254.1
Local DNS: usually the same as your firewall / router / gateway
ISP Details
BT
Primary DNS 1: 194.72.9.34
Secondary DNS 1: 194.72.9.38
Primary DNS 2: 194.74.65.68
Secondary DNS 2: 194.74.65.69
Primary DNS 3: 194.72.0.98
Secondary DNS 3: 194.72.0.114
Primary DNS 4: 62.6.40.162
Secondary DNS 4: 62.6.40.178
BT DNS isn't pingable.
POP3: pop3.btconnect.com
SMTP: smtp.btconnect.com
Status info: 0800-1690199
Service status: http://www.btbroadbandoffice.com/help/sstatus/bb
http://btbusiness.custhelp.com
Zen Internet
Primary DNS: 212.23.6.100
Secondary DNS: 212.23.3.100
Tech support: 0870-6000-973
SMTP: mailhost.zen.co.uk
Phone Co-op
Primary DNS: 139.175.55.224
Secondary DNS: 195.10.244.152
Telephone tech support: 0845 458 9000 9am - 8pm Monday to Friday; 9am - 2.30pm Saturdays; Bank Holidays 10am - 2pm; (Closed on Sundays)
Service status page: http://www.thephone.coop/support/internet/servicestatus.html
Customer services: 0845 458 9000 9am - 8pm Monday to Friday; 9am - 2.30pm Saturdays; Bank Holidays 10am - 2pm; (Closed on Sundays)
Email: internetsuppprt@phone.coop
Dealing With Firewalls
Restart a Linux or BSD firewall / router / gateway by pressing Ctrl+Alt+Del and waiting for it to restart.
You can login using either the web browser interface or SSH.
Dealing With Modems
To restart, preferably login through the web browser interface and choose restart or reboot. If you can't login and retstart it then power cycle it but note some cheap modems standa a chance of losing their settings when you power cycle them.
It may not be enough to reboot a modem from the web browser interface to make it work, it may need power cycling.
You can login using either the web browser interface or sometimes telnet or SSH.
Dealing With Hubs
Also known as a switch. Just turn them off and back on again.