Quality of Service
328
9.7
QoS configuration
BAT54-Rail/F..
Release
7.54
06/08
D %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 prefer-
entially by the entry “%Qcds32 @dEF“, and a bandwidth of 32 Kbps is guar-
anteed thereby as well. In parallel, the PMTU is reduced to 256 byte by
“%Fprw256 @dEF“, which enables ensuring the required bandwidth in re-
ceiving direction at all.
Note: Further information about defining Firewall rules can be found in chap-
ter ’Firewall’ → page 249.
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:
D The rule does not need an action, because QoS rules always implicitly as-
sume “transfer” as action.
D The guaranteed bandwidth is defined on index card 'QoS'.
D The option 'Action only for default route' limits the rule to those pack-
ets, which are sent or received via default route.
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