show tcp syn-cookies

Last Updated : Nov 06, 2012 |
Displays SYN cookies statistics for inbound TCP connections.
Note:
This command applies to IPv4 only.
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Keywords:

Syntax

show tcp syn-cookies

User level

read-only

Context

general

Example

To show SYN cookies statistics:
Gxxx-001(super)# show tcp syn-cookies
Status: Enabled
Statistics:
SYN rcvd                              10
Connections established                9
local address          remote address        state           Last access (sec)
---------------------  --------------------  --------------  ----------------
192.113.241.201:60342  111.211.131.1:80      IN_PROGRESS             1
192.113.241.201:23     221.2.11.11:432       ESTABLISHED          1200
192.113.241.201:23     121.192.171.121:7311  CLOSING                10

Output fields

Field
Description
Status
The operational status of the TCP SYN cookies defense mechanism: Enabled or Disabled
SYN rcvd
The total number of TCP SYN packets received since the last time the counters were reset
Connections established
The total number of connections that were established since the last time the counters were reset
local address
The local IP address and port of the connection
remote address
The remote IP address and port of the connection
state
The state of the connection:
  • IN_PROGRESS — connection is in progress
  • ESTABLISHED — connection is established
  • CLOSING — connection is closing
Last access
The seconds elapsed since the last time a packet was received on the connection from either side