Kerio Tech KERIO WINROUTE FIREWALL 6 User Manual download pdf (Page 135)

9.3 Detection of connections with large data volume transferred

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cally. With exception of special conditions (testing purposes) it is highly recommended not

to change the default values!

Figure 9.5 Bandwidth Limiter — setting parameters for detection of large data volume transfers

For detailed description of the detection of large data volume transmissions, refer to

chapter 9.3.

9.3 Detection of connections with large data volume transferred

This chapter provides description of the method used by the Bandwidth Limiter module to

detect connections where large data volumes are transmitted. This description is an extra

information which is not necessary for usage of the Bandwidth Limiter module.

Network traﬃc is diﬀerent for individual services. For example, web browsers usually access

sites by opening one or more connections and using them to transfer certain amount of data

(objects included at the page) and then closes the connections. Terminal services (e.g. Telnet,

SSH, etc.) typically use an open connection to transfer small data volumes in longer intervals.

Large data volume transfers typically uses the method where the data ﬂow continuously with

minimal intervals between the transfer impulses.

Two basic parameters are tested in each connection: volume of transferred data and duration

of the longest idle interval. If the speciﬁed data volume is reached without the idleness interval

having been thresholded, the connection is considered as a transfer of large data volume and

corresponding limits are applied.

If the idle time exceeds the deﬁned value, the transferred data counter is set to zero and the

process starts anew. This implies that each connection that once reaches the deﬁned values is

considered as a large data volume transfer.

The value of the limit for the amount of data transmitted and the minimal idleness period are

conﬁguration parameters of the Bandwidth Limiter (see chapter 9.2).

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Kerio Tech KERIO WINROUTE FIREWALL 6 User Manual Page 135