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Another vote for Wire Shark...
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WSH is great but not for monitoring
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Thanks John, I quite like CommView and how it breaks down the traffic it is scanning/monitoring for easier viewing.
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Thanks John, I quite like CommView and how it breaks down the traffic it is scanning/monitoring for easier viewing.

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@hbcit - Thanks for the update and I was happy to help. I like CommView as well.
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@hbcit - Thanks for the update and I was happy to help. I like CommView as well.

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Is there any recommended paid or free software that can be left to snoop on your LAN, and display possible network errors and/or uncontrolled flooding when they occur (and their possible source)?
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Is there any recommended paid or free software that can be left to snoop on your LAN, and display possible network errors and/or uncontrolled flooding when they occur (and their possible source)?

Discover network errors

Network analysis is the process of identifying and remediating the processes and systems within a network, including performance, connectivity and security. The process is performed through the use of tools developed for monitoring and analyzing network activity. Network problems that involve finding an optimal way of doing something are studied under the name combinatorial optimization. Examples include network flow, shortest path problem, transport problem, transshipment problem, location problem, matching problem, assignment problem, packing problem, routing problem, Critical Path Analysis and PERT (Program Evaluation & Review Technique).

Network Analysis

Network Management involves issues that are independent of specific hardware or software, including email policies, upgrade planning, backup scheduling and working with managed service providers for Desktop-As-A-Service (DaaS), Software-As-A-Service (SaaS) and the like through the use of tools, coupled with manufacturer standards, best practice guidelines, policies and procedures plus all other relevant documentation. Network management also includes monitoring, alerting and reporting, management reporting, planning for device or service updates, the backup of configurations, the setting of key performance indicators and measures (KPIs/KPMs), associated service level agreements and problem records as part of the IT Service Management (ITSM) framework.

Network Management

Network Operations includes asset management, help-desk supervision, security and user policies, infrastructure administration and anything else that affects the operation of your network. Discussions will include those of best practices in platforms, configurations, performance, security and accounting.