Users Guide

Usage Information
When all sequence numbers are exhausted, this feature permits re-assigning a new sequence number to entries of
an existing access-list.
seq
Assign a sequence number to a deny or permit lter in an extended IP access list while creating the lter.
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 [portnumber ]] [count [byte] | log] [dscp value] [ecn value]
[fragments] [monitor [session-ID]] [no-drop] [order]
Parameters
sequence-number Enter a number from 0 to 4294967290.
deny Enter the keyword deny to congure a lter to drop packets meeting this condition.
permit Enter the keyword permit to congure a lter to forward packets meeting this criteria.
ip-protocol-number Enter a number from 0 to 255 to lter based on the protocol identied in the IP protocol
header.
icmp Enter the keyword icmp to congure an ICMP access list lter.
ip Enter the keyword ip to congure a generic IP access list. The keyword ip species that
the access list permits all IP protocols.
tcp Enter the keyword tcp to congure a TCP access list lter.
udp Enter the keyword udp to congure a UDP access list lter.
source Enter an IP address in dotted decimal format of the network from which the packet was
received.
mask (OPTIONAL) 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 and then enter the IP address to specify a host IP address or
hostname.
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.)
portnumber (OPTIONAL) Enter the application layer port number. Enter two port numbers if you are
using the range logical operand. The range is from 0 to 65535.
The following list includes some common TCP port numbers:
• 23 = Telnet
• 20 and 21 = FTP-DATA and FTP
• 25 = SMTP
216 Access Control Lists (ACL)