Dell Force10 MXL Blade - Permit Tcp

112 | Access Control Lists (ACL)
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permit tcp
Configure a filter to pass TCP packets meeting the filter criteria.
Syntax
permit tcp {source mask | any | host ip-address} [bit] [operator port [port]] {destination mask | any
| host ip-address} [bit] [dscp] [operator port [port]] [count [byte]] [order] [fragments]
To remove this filter, you have two choices:
• Use the no seq sequence-number command if you know the filter’s sequence number.
• Use the no permit tcp {source mask | any | host ip-address} {destination mask | any | host
ip-address} command.
Parameters
source
Enter the IP address of the network or host from which the packets were sent.
mask
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 followed by the IP address to specify a host IP address.
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
dscp
Enter this keyword to deny a packet based on DSCP value.
Range: 0-63
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 port for the port
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.
mask
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.
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.