Administrator 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 Networking OS Conguration 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 ow-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 congure ACL logging and byte counters simultaneously, byte counters may display
an incorrect value. Congure packet counters with logging instead.
Related Commands
• deny tcp — assign a lter to deny TCP packets.
• deny udp — assign a lter to deny UDP packets.
• ip access-list extended — create an extended ACL.
deny icmp
To drop all or specic internet control message protocol (ICMP) messages, congure a lter.
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 lter, you have two choices:
• Use the no seq sequence-number command if you know the lter’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 /prex format (/x) or A.B.C.D. The mask, when specied 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 lter.
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 specied
ttl value.
• neq(not equal to) — matches packets that contain a ttl value that is not equal to the
specied ttl value.
•
gt(greater than) — matches packets that contain a ttl value that is greater than the
specied ttl value.
202 Access Control Lists (ACL)