Service Manual

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 deny 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 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.
any Enter the keyword any to specify that all routes are subject to
the filter.
host ip-address Enter the keyword host then the IP address to specify a host IP
address.
dscp Enter this keyword dscp to deny a packet based on the DSCP
value. The range is from 0 to 63.
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
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)
port port
Enter the application layer port number. Enter two port numbers
if 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
• 25 = SMTP
Access Control Lists (ACL) 261