Reference Guide

1324 | Security
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deny tcp
e
Configure a filter that drops TCP packets meeting the filter criteria.
Syntax
deny tcp {source address mask | any | host ip-address} [operator port [port]]
{destination mask | any | host ip-address} [operator port [port]] [count [byte]] | log] [order
number]
To remove this filter, you have two choices:
• Use the no seq sequence-number command syntax if you know the filter’s sequence number
or
• Use the no deny tcp {source mask | any | host ip-address} {destination mask | any | host
ip-address} command.
Parameters
Defaults
Not configured.
Command Modes
TRACE LIST
Related
Commands
source
Enter the IP address of the network or host from which the packets were sent.
mask
(OPTIONAL) Enter a network mask in /prefix format (/x).
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 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
Enter the IP address of the network or host to which the packets are sent.
count (OPTIONAL) Enter the keyword count to count packets processed by the filter.
byte (OPTIONAL) Enter the keyword byte to count only bytes processed by the filter.
log (OPTIONAL) Enter the keyword log to have the information kept in a Trace-list log
file.
order number
(OPTIONAL) Enter the keyword order followed by a number from 0 to 7 as the
order number.
deny Assign a trace list filter to deny IP traffic.
deny udp Assign a trace list filter to deny UDP traffic.