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 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 [portnumber ]] [ttl operator] [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 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 permits 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 an IP address in dotted decimal format of the network from which the packet
was received.
mask (OPTIONAL) 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 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
● 169 = SNMP
destination Enter the IP address of the network or host to which the packets are sent.
ttl Enter the keyword ttl to permit or deny a packet based on the time to live value.
The range is from 1 to 255.
Access Control Lists (ACL) 221