3-17
Virus Throttling (Connection-Rate Filtering)
Configuring Connection-Rate Filtering
When a host becomes blocked the switch generates the following Event Log
message and also sends a similar message to any configured SNMP trap
receivers.
Src IP xxx.xxx.xxx.xxx blocked
Note HP recommends that, before you unblock a host that has been blocked by
connection-rate filtering, you inspect the host with current antivirus tools and
remove any malicious agents that pose a threat to your network.
If a trusted host frequently triggers connection-rate blocking with legitimate,
high connection-rate traffic, then you may want to consider either changing
the sensitivity level on the associated port or configuring a connection-rate
ACL to create a filtering exception for the host.
Note For a complete list of options for unblocking hosts, see page 3-6.
Syntax: connection-rate-filter unblock < all | host | ip-addr >
all: Unblocks all hosts currently blocked due to action by
connection-rate filtering on ports where block mode has
been configured.
host < ip-addr >: Unblocks the single host currently blocked
due to action by connection-rate filtering on ports where
block mode has been configured.
ip-addr < mask > : Unblocks traffic from any host in the
specified subnet currently blocked due to action by connec-
tion-rate filtering on ports where block mode has been
configured.
Note: There is also an option to unblock any host belonging
to a specific VLAN using the vlan <vid> connection-rate-filter
unblock command.
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