Reference Guide

224 | Access Control Lists (ACL)
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You cannot include IP, TCP or UDP (Layer 3) filters in an ACL configured with ARP or Ether-type
(Layer 2) filters. Apply Layer 2 ACLs (ARP and Ether-type) to Layer 2 interfaces only.
deny icmp
e
Configure a filter to drop all or specific ICMP messages.
Syntax
deny icmp {source mask | any | host ip-address} {destination mask | any | host ip-address}
[dscp] [message-type] [count [byte] | log] [order] [monitor] [fragments]
To remove this filter, you have two choices:
• Use the no seq sequence-number command syntax if you know the filter’s sequence number
or
• Use the no deny icmp {source mask | any | host ip-address} {destination mask | any |
host ip-address} command.
Parameters
Note: When ACL logging and byte counters are configured simultaneously, byte counters
may display an incorrect value. Configure packet counters with logging instead.
source
Enter the IP address of the network or host from which the packets were sent.
mask
Enter a network mask in /prefix format (/x) or A.B.C.D. The mask, when specified in
A.B.C.D format, may be either contiguous or non-contiguous.
any Enter the keyword any to specify that all routes are subject to the filter.
host ip-address Enter the keyword host followed by the IP address to specify a host IP address.
destination
Enter the IP address of the network or host to which the packets are sent.
dscp
Enter this keyword to deny a packet based on DSCP value.
Range: 0-63
message-type
(OPTIONAL) Enter an ICMP message type, either with the type (and code, if
necessary) numbers or with the name of the message type (ICMP message types are
listed in Table 9-2).
Range: 0 to 255 for ICMP type; 0 to 255 for ICMP code
count (OPTIONAL) Enter the keyword count to count packets processed by the filter.
byte (OPTIONAL) Enter the keyword byte to count bytes processed by the filter.
log (OPTIONAL, E-Series only) Enter the keyword log to have the information kept in
an ACL log file.
order (OPTIONAL) Enter the keyword order to specify the QoS priority for the ACL
entry.
Range: 0-254 (where 0 is the highest priority and 254 is the lowest; lower order
numbers have a higher priority)
Default: If the order keyword is not used, the ACLs have the lowest order by default
(255).
monitor (OPTIONAL) Enter the keyword monitor when the rule is describing the traffic that
you want to monitor and the ACL in which you are creating the rule will be applied to
the monitored interface. For details, see the section “Flow-based Monitoring” in the
Port Monitoring chapter of the FTOS Configuration Guide.
fragments Enter the keyword fragments to use ACLs to control packet fragments.