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Dell SonicWALL Scrutinizer 11.5.2 Release Notes
P/N 232-002504-00 Rev A
Release Notes
FAQ
• What is NetFlow?
Cisco® NetFlow technology is an embedded feature within Cisco IOS routers and high end switches (e.g. 6500
series). NetFlow data records consist of information about source and destination addresses, along with the
protocols and ports used in the end-to-end conversation. Scrutinizer uses this information to generate graphs
and reports on traffic patterns and bandwidth utilization. More information can be found here.
• What is sFlow?
Unlike NetFlow which aggregates multiple conversation streams into a single packet, sFlow is a packet sample
of traffic. Although it offers 100% of the packet, when used strictly for IP accounting, it is unreliable.
• What are the different versions of NetFlow available?
Version 1 is the original format supported in the initial NetFlow releases, while version 5 is the standard and
most common NetFlow version deployed. Version 5 is an enhancement that adds Border Gateway Protocol
(BGP) autonomous system information and flow sequence numbers. Version 6 is similar to version 7. This
version is not used in the new IOS releases. Version 7 is an enhancement that exclusively supports NetFlow
with Cisco Catalyst 5000, 6500 and 7600 series switches. Version 8 is an enhancement that adds router-based
aggregation schemes. It was introduced to reduce resource usage, and includes a choice of eleven aggregation
schemes. Version 9 is an enhancement to support different technologies such as Multicast, Internet Protocol
Security (IPsec), and Multi-Protocol Label Switching (MPLS). Versions 2, 3 and 4 either were not released.
Scrutinizer currently supports:
o NetFlow versions 1,5,6,7 and 9
o sFlow version 2, 4 and 5
o Flexible NetFlow, IPFIX, JFlow and NetStream
• How is NetFlow different from traffic analyzers like MRTG?
MRTG and other such equivalent tools provide information that is largely limited to SNMP statistics. NetFlow is
more geared toward application-level details such as hosts, protocols, and conversations, which are an inherent
part of IP traffic.
• Is Cisco the only vendor supporting NetFlow?
NetFlow technology was invented by Cisco, and Cisco IOS devices offer NetFlow compatibility. There may be
other vendors offering NetFlow support on their devices. Scrutinizer has been tested on over a dozen different
vendors.
• Is a trial version of Scrutinizer available for evaluation?
Yes. A free version of Scrutinizer can be downloaded and you can get an evaluation license to try the full
version.
• What are the differences between the free and commercial version?
The commercial version of Scrutinizer NetFlow & sFlow Analyzer includes the Flow Analytics add-on module,
which adds historical data retention and network behavior analysis.
• What are the system requirements?
Scrutinizer's system requirements are detailed here: System Requirements
• How do I find out if my Cisco equipment supports NetFlow?
Review the NetFlow Services Solutions Guide to find out if you have a NetFlow compatible Cisco router or
switch.
• What if I need features that Scrutinizer does not support?
We understand that our software needs to be flexible. If you want a feature added, we may be able to work with
you.