Dell Force10 TeraScale C Series, Reference Manual

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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.