L3 & L4 Header Inspection
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11.0 (EoL)
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End-of-Life (EoL)
L3 & L4 Header Inspection
- Network > Network Profiles > Zone Protection > L3 & L4 Header Inspection
When L3 & L4 header inspection is enabled globally, the firewall
is able to detect and prevent vulnerabilities within the supported
protocols (IP/IPv6, ICMP/ICMPv6, TCP and UDP) and log and/or block
packets that match the user-specified custom rules. Additionally,
you must Enable Net Inspection (NetworkZones)
for each security zone using header inspection custom rules.
You can add, delete, and clone existing rules, as well as define
the precedence and operational status of the custom rules as evaluated
by the Zone Protection profile.
After you configure L3 & L4 header inspection in a Zone Protection
profile, apply the profile to an ingress security zone.
Palo Alto Networks recommends configuring
and enabling L3 & L4 Header Inspection only at the security
zones that are expected to encounter and process packets that match
the custom rules, as there are a limited number of zones that can
operate simultaneously when this feature is enabled.
Zone Protection Profile Settings—L3
& L4 Header Inspection | Configured In | Description |
---|---|---|
Configuration Tab | ||
General | ||
Rule | NetworkNetwork ProfilesZone ProtectionL3 & L4 Header Inspection | Enter a name to identify the custom rule
(up to 31 characters). |
Threat ID | Specify a threat ID number for the custom
rule configuration (the vulnerability signature range is 41000-45000
and 6800001-6900000). | |
Comment | Enter an optional comment to describe the
custom rule. | |
Packet Capture | Enables a packet capture upon detection
of a vulnerability matching the custom rule. From the drop-down,
select single-packet or extended-capture,
or disable if you do not want to want the
firewall to record packet captures. You can also send
icmp unreachable packets if packet is dropped to inform
the client a session is not allowed. | |
Exempt IP | Enter the IP address(es) for which you do
not want the custom rule to apply to. | |
Properties | ||
Log Severity | NetworkNetwork ProfilesZone ProtectionL3 & L4 Header Inspection | Specify the log severity level that is recorded
when the firewall detects a vulnerability matching the custom rule. |
Log Interval | Specify the maximum log frequency (in seconds)
of a matching event. | |
Action | Specify the policy action to be taken when
a vulnerability matching the custom rule is detected in the header.
Options include:
| |
Reference | ||
CVE | NetworkNetwork ProfilesZone ProtectionL3 & L4 Header Inspection | Publicly known security vulnerability identifier associated
with the threat. The Common Vulnerabilities and Exposures (CVE)
identifier is the most useful identifier for finding information
about unique vulnerability as vendor specific IDs commonly encompass multiple
vulnerabilities. |
Bugtraq | The bugtraq identifier (similar to CVE)
associated with the vulnerability. Can be used as an external reference
for additional background and analysis details. | |
Vendor | The vendor-specific identifier for a vulnerability. | |
Reference | Links to additional analysis or background information. | |
Signature Tab | ||
Comment | NetworkNetwork ProfilesZone ProtectionL3 & L4 Header Inspection | Enter an optional comment to describe the
custom rule signature details. |
Or Condition | Specify an Or condition value
for the custom signature. | |
And Condition | Add an And Condition for the
custom signature by configuring the following:
Add
conditions are added as a second level entry under Or
Condition. |