Troubleshooting Security Policy Validation Errors (NSM Procedure)
Problem
If
NSM identifies a problem in the policy during policy validation, it
displays information about the problem at the bottom of the selected
rulebase. For example, if you included a non-IDP capable security
device in the Install On column of an IDP rule, policy validation
displays an error message. You can validate those errors and troubleshoot
them.
Table 1 describes security policy validation errors and how to resolve them.
Table 1: Troubleshooting:
Security Policy Validation Errors
|
Error
|
Description
|
|
Rule Duplication
|
Rule appears more than once.
To resolve this problem, delete the duplicate.
|
|
Rule Shadowing
|
Rule shadowing occurs when two rules are designed to
detect the same attack, and the first rule is either a terminal match
rule or contains a more severe action than the second rule. In these
cases, the second rule will never be applied.
To resolve this problem, modify or delete one of the rules.
|
|
Protocol Mismatches
|
Protocol mismatches occur when a service object that
is specified in the Service column of the security policy uses a different
protocol from that specified by the default service binding of the
attack object for that rule. Remember that the service binding specifies
the service and port that the attack uses. Because two different protocols
are specified, IDP cannot match attacks for the attack object.
To resolve this problem, set Service to Default.
|
|
Any-Any-None Rules
|
Any-Any-None rules are rules that specify any for the
source and destination and none for attacks. Because IDP must log
all packets for all connections, this rule can cause severe IDP performance
penalties.
To resolve this problem, specify network objects for the destination
and attack objects for the attacks.
|
|
Any-Any-One Rules
|
Any-Any-One rules are rules that specify any for the
source and destination and a single attack object for attacks. Because
IDP must look at all network traffic, this rule can cause severe IDP
performance penalties.
To resolve this problem, specify network objects for the destination.
|
|
Unsupported Options
|
Rule contains options that are not supported on the target
device.
To resolve this problem, upgrade the target device or remove
the option from the rule.
|
Solution