Amer Networks E5Web GUI - Manual (Page 476)

The group type is one of the values IDS, IPS or Policy. These types are explained above.
2. Signature Group Category
This second level of naming describes the type of application or protocol. Examples are:
• BACKUP
• DB
• DNS
• FTP
• HTTP
3. Signature Group Sub-Category
The third level of naming further specifies the target of the group and often specifies the
application, for example MSSQL. The Sub-Category may not be necessary if the Type and
Category are sufficient to specify the group, for example APP_ITUNES.
Listing of IDP Groups
A listing of IDP groupings can be found in Appendix B, IDP Signature Groups. The listing shows
group names consisting of the Category followed by the Sub-Category, since the Type could be
any of IDS, IPS or POLICY.
Processing Multiple Actions
For any IDP rule, it is possible to specify multiple actions and an action type such as Protect can
be repeated. Each action will then have one or more signatures or groups associated with it.
When signature matching occurs it is done in a top-down fashion, with matching for the
signatures for the first action specified being done first.
IDP Signature Wildcarding
When selecting IDP signature groups, it is possible to use wildcarding to select more than one
group. The "?" character can be used to wildcard for a single character in a group name.
Alternatively, the "*" character can be used to wildcard for any set of characters of any length in a
group name.
Caution: Use the minimum IDP signatures necessary
Do not use the entire signature database and avoid using signatures and signature
groups unnecessarily. Instead, use only those signatures or groups applicable to the type
of traffic being protected.
For example, using only the IDP groups IDS_WEB*, IPS_WEB*, IDS_HTTP* and
IPS_HTTP* would be appropriate for protecting an HTTP server.
IDP traffic scanning creates an additional load on the hardware that, in most cases,
should not noticeably degrade performance. Using too many signatures during
scanning can make the load on the hardware unnecessarily high, adversely affecting
throughput.
Chapter 6: Security Mechanisms
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