User Interface
R&S
®
GP-E/GP-S
27User Manual v16.2.1 ─ 01
placed at the beginning of the list, followed by more general rules that apply to a
broader range of traffic.
You can rearrange rules by dragging and dropping them in the list to create the desired
sequence.
Custom decoders
To avoid confusion, use either application signatures or decoders.
If multiple decoders are defined for a single rule, decoders of the same protocol (such
as two HTTP decoders) are linked with AND logic. Decoders of different protocols (such
as an HTTP and a DNS decoder) are OR-connected.
To add a protocol decoder to a firewall rule, perform the following steps:
1.
Click " Add Decoder" on the "Custom Decoders" tab.
2. Select a "Protocol" from the drop-down list.
3. The entries in the "Option" drop-down list are protocol-specific and determine
which fields or portion of the content are searched.
4. Select the "Type" of content to search for (text string, number, hash value, or regu-
lar expression) from the drop-down list.
5. By selecting the "Invert" checkbox, the rule will match traffic if the specified
"Option" is not matched (equivalent to a Boolean NOT operator).
6. Enter the desired text, number, term, or search keyword in the "Expression" field.
The selected type determines how the expression is treated and which other options
are available.
When the "Type" option is set to string, the following additional options can be
defined.
Firewall Rule Settings
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