Useful Links

Piquant Design

..are a Cambridge based custom installation company, designing and integrating high-definition entertainment and environment control technologies for homes and businesses.

ShieldsUP! by Steve Gibson

This tool performs a NMAP-style link scan back into the originating external IP address and shows graphical results. Great for checking the security of your firewall policy. Also useful for discovering your external IP address.

IP Subnet Calculator by Cisco

Useful for calculating IP Address Schemas
(requires a CCO login)

Private IP Addressing - RFC 1918

The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private internets:

10.0.0.0 - 10.255.255.255 (10/8 prefix)

172.16.0.0 - 172.31.255.255 (172.16/12 prefix)

192.168.0.0 - 192.168.255.255 (192.168/16 prefix)

Business Benefits of Wireless Networks

Thinking of rolling out or upgrading wireless networks for your business? These white papers may give some food for thought.

http://www.cisco.com/en/US/products/hw/

wireless/products_category_business_benefits.html

Nagios OSS NMS

The Nagios Open Source Network management System is a system we have installed into a few of our customers. They seem very pleased with it but it can be quite complex to install. Contact us to talk about it.