Daren Matthews

Copy this text into a file with a “.reg” extension, then double click to update registry  (caution: backup registry beforehand)

[HKEY_CLASSES_ROOT\telnet\shell\open\command]
@=”putty.exe %1″

The Image Verification feature, added in Cisco IOS Software Releases 12.3(4)T, 12.0(26)S, and 12.2(18)S, builds on the MD5 File Validation functionality to more easily allow network administrators to verify the integrity of an image file that is loaded on the Cisco IOS file system of a device. Read more…

SNMP monitoring often references interfaces using the “ifindex”, in order to solicit information.  Sometimes though, the ifindex can change or be slightly different to the actual interface number, for example: Read more…

This PDF describes the deployment strategy in detail, including planning, deployment and lessons learned.  A very useful document if you are planning a large VoIP upgrade or installation.  VIEW PDF

How to set up an IPSec tunnel between two LANs using the same subnet.

Conflicting LAN IP subnets can cause difficulties when routing through a tunnel.  This configuration uses NAT to overcome the problem of duplicate addresses: Read more…

Another Aide-Memoir: SIP User Agents in different domains  – session establishment (also uses location server): Read more…

Fun numbers are free (no cost) numbers you can call to either test your connection or get several services. The connections to these numbers are usually free of charge, as the “lines” are using the internet to transfer your voice between you and the service. Read more…

NetFlow Export Version Formats

For all export versions, the NetFlow export datagram consists of a header and a sequence of flow records. The header contains information such as sequence number, record count, and system uptime. Read more…

Planning for Voice over IP requires an understanding of the various headers added when transporting packetised voice, espcially over an IPSec VPN: Read more…