The ip blacklist packet permit command enables the packets that are filtered out by the blacklist to be sent to the protocol stack.
The undo ip blacklist packet permit command disables the packets that are filtered out by the blacklist from being sent to the protocol stack.
By default, packets that are filtered out by the blacklist are not sent to the protocol stack.
Usage Scenario
After an ACL is configured for services (for example, the snmp-agent acl command is configured for SNMP or the telnet server acl command is configured for Telnet), If TCP or UDP packets are denied by a configured ACL, the ip blacklist packet permit command and its undo format can be used to control the system whether to reply with packets to the source end.
Configuration Impact
After the ip blacklist packet permit command is run, the system will reply with specific packets to the source end based on the type of packet denied by the system.