Setup Guide

Usage
Information
The order option is relevant in the context of the Policy QoS feature only. For more information, see the
Quality of Service section in the Dell EMC Networking OS Configuration Guide.
When you use the log option, the CP processor logs detail the packets that match. Depending on how
many packets match the log entry and at what rate, the CP may become busy as it has to log these
packets’ details.
The monitor option is relevant in the context of flow-based monitoring only. For more information, see
Port Monitoring.
The C-Series and S-Series cannot count both packets and bytes, when you enter the count byte options,
only bytes are incremented.
NOTE: When you configure ACL logging and byte counters simultaneously, byte counters may display
an incorrect value. Configure packet counters with logging instead.
Related
Commands
● deny tcp — assign a filter to deny TCP packets.
● deny udp — assign a filter to deny UDP packets.
● ip access-list extended — create an extended ACL.
deny icmp
To drop all or specific internet control message protocol (ICMP) messages, configure a filter.
Syntax
deny icmp {source mask | any | host ip-address} {destination mask | any
| host ip-address} [ttl operator] [dscp] [count [byte] [order] [fragments]
[monitor] [no-drop]
To remove this filter, you have two choices:
● Use the no seq sequence-number command if you know the filter’s sequence number.
● Use the no deny icmp {source mask | any | host ip-address} {destination
mask | any | host ip-address} command.
Parameters
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 then 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.
ttl Enter the keyword ttl to deny a packet based on the time to live value. The range
is from 1 to 255.
operator Enter one of the following logical operand:
● eq(equal to) — matches packets that contain a ttl value that is equal to the
specified ttl value.
● neq(not equal to) — matches packets that contain a ttl value that is not equal
to the specified ttl value.
● gt(greater than) — matches packets that contain a ttl value that is greater
than the specified ttl value.
● lt (less than) — matches packets that contain a ttl value that is less than the
specified ttl value.
● range(inclusive range of values) — matches packets that contain a ttl value
that falls between the specified range of ttl values.
dscp Enter this keyword dscp to deny a packet based on the DSCP value. The range is
from 0 to 63.
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.
198 Access Control Lists (ACL)