Command Reference Guide

714 | IPv6 Access Control Lists (IPv6 ACLs)
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• Use the no seq sequence-number command syntax if you know the filter’s
sequence number or
• Use the
no deny tcp {source address mask | any | host ipv6-address} {destination
address
| any | host ipv6-address} command.
Parameters
source address
Enter the IPv6 address of the network or host from which the packets
were sent in the x:x:x:x::x format followed by the prefix length in the /x
format.
Range: /0 to /128
The :: notation specifies successive hexadecimal fields of zero.
mask
Enter a network mask in /prefix format (/x).
any
Enter the keyword any to specify that all routes are subject to the filter.
host ipv6-address
Enter the keyword host followed by the IPv6 address of the host in the
x:x:x:x::x format.
The :: notation specifies successive hexadecimal fields of zero
operator
(OPTIONAL) Enter one of the following logical operand:
• 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 command parameter.
port port 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 address
Enter the IPv6 address of the network or host to which the packets are
sent in the x:x:x:x::x format followed by the prefix length in the /x
format.
Range: /0 to /128
The :: notation specifies successive hexadecimal fields of zero.
bit Enter a flag or combination of bits:
ack: acknowledgement field
fin: finish (no more data from the user)
psh: push function
rst: reset the connection
syn: synchronize sequence numbers
urg: urgent field
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.