Lancom Systems LCOS 3.50 Server User Manual


 
̈ 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