Dell C1048P Port Extender Networking Command-Line Reference Guide for the C900 - Page 259

permit tcp To pass TCP packets meeting the filter criteria, configure a filter. C9000 Series 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 [bytes]] [log] [order] [monitor] [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 mask any host ip-address bit dscp operator port port Enter the IP address of the network or host from which the packets were sent. 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. Enter the keyword any to specify that all routes are subject to the filter. Enter the keyword host then the IP address to specify a host IP address. 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 Enter the keyword dscp to deny a packet based on the DSCP value. The range is from 0 to 63. (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 parameter) Enter the application layer port number. Enter two port numbers if you are 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) 259