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̈ Chapter 9: Quality of Service LANCOM Reference Manual LCOS 3.50
185
Quality of Service
WEBconfig, Telnet
For configuration with WEBconfig or Telnet, the parameters are entered at the
following places into a new Firewall rule:
The Firewall rule is extended by condition “@d” and the DSCP (Differentiated
Services Code Point). The code point can either be indicated with its name
(CS0 - CS7, AF11 to AF 43, EF or BE) or its decimal resp. hexadecimal depic-
tion. “Expedited Forwarding” can therefore be indicated as “@dEF”, “@d46”
or “@d0x2e”. Furthermore, collective names (CSx resp. AFxx) are possible.
Examples:
̈ %Lcds0 @dAFxx %A: Accept (secured transmission) on DiffServ “AF”,
limit “0”
̈ %Qcds32 @dEF: Minimum bandwidth for DiffServ “EF” of 32 kbps
̈ %Fprw256 @dEF: PMTU reduction for reception for DiffServ “EF” to 256
bytes
These examples reserve a desired bandwidth for Voice over IP phone calls. The
first element “%Lcds0 @dAFxx %A“ accepts DSCP “AFxx” marked packets of
signalling calls. Voice data marked with “EF” is transferred preferentially by
the entry “%Qcds32 @dEF“, and a bandwidth of 32 Kbps is guaranteed
thereby as well. In parallel, the PMTU is reduced to 256 byte by “%Fprw256
@dEF“, which enables ensuring the required bandwidth in receiving direction
at all.
Further information about defining Firewall rules can be found in
chapter ’Firewall’ →page 104.
9.7.2 Defining minimum and maximum bandwidths
LANconfig
A minimum bandwidth for certain applications is defined in LANconfig by a
Firewall rule according to the following conditions:
̈ The rule does not need an action, because QoS rules always implicitly
assume “transfer” as action.
Configuration tool Run
WEBconfig Setup/IP router module/Firewall/Rule list
Telnet Setup/IP router module/Firewall/Rule list