Archive

Archive for May, 2010

SNMP MIB Persistancy

May 26th, 2010 No comments

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…

Categories: Network Management Tags:

Case Study – Largest VoIP Deployment in the Industry (Cisco’s own VoIP Network)

May 21st, 2010 No comments

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

Categories: Network Design, Voice over IP Tags:

Configuring IPSec tunnel between two LANs using the same subnet

May 15th, 2010 No comments

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…

Categories: CISCO, Network Design, Security Tags: ,

Trunk to Asterisk from Cisco Call Manager Express

May 14th, 2010 No comments

This configuration enables a trunk between an Asterisk Open Source PBX and Cisco Unified Call Manager Express: Read more…

Categories: Voice over IP Tags: ,

SIP – Communicating Between Domains

May 14th, 2010 No comments

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

Categories: Voice over IP Tags: ,

Testing VoIP using “Fun Numbers”

May 13th, 2010 No comments

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…

Categories: Voice over IP Tags: , ,

NetFlow Export

May 9th, 2010 No comments

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…

Categories: CISCO, Network Management Tags: