Reference Guide

248 | Access Control Lists (ACL)
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seq
c e s
Assign a sequence number to a deny or permit filter in an extended IP access list while creating the
filter.
Syntax
seq sequence-number {deny | permit} {ip-protocol-number | icmp | ip | tcp | udp}
{source mask | any | host ip-address} {destination mask | any | host ip-address} [operator
port [port]] [count [byte] | log] [dscp value] [order] [monitor] [fragments]
Parameters
sequence-number
Enter a number from 0 to 4294967290.
deny Enter the keyword deny to configure a filter to drop packets meeting this condition.
permit Enter the keyword permit to configure a filter to forward packets meeting this
criteria.
ip-protocol-number
Enter a number from 0 to 255 to filter based on the protocol identified in the IP
protocol header.
icmp Enter the keyword icmp to configure an ICMP access list filter.
ip Enter the keyword ip to configure a generic IP access list. The keyword ip specifies
that the access list will permit all IP protocols.
tcp Enter the keyword tcp to configure a TCP access list filter.
udp Enter the keyword udp to configure a UDP access list filter.
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.
operator
(OPTIONAL) Enter one of the following logical operands:
•
eq = equal to
•
neq = not equal to
•
gt = greater than
•
lt = less than
•
range = inclusive range of ports (you must specify two ports for the port
parameter.)
port port
(OPTIONAL) Enter the application layer port number. Enter two port numbers if
using the
range logical operand.
Range: 0 to 65535
The following list includes some common TCP port numbers:
• 23 = Telnet
• 20 and 21 = FTP
• 25 = SMTP
• 169 = SNMP
destination
Enter the IP address of the network or host to which the packets are sent.
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.