remembered connection requests .. syn .. backlog

$cat /proc/sys/net/ipv4/tcp_max_syn_backlog 
1024
$

Maximal number of remembered connection requests, which still did not 
receive an acknowledgement from connecting client. The default value
 is 1024 for systems with more than 128 MB of memory, and 128 for low
 memory machines. If server suffers of overload, try to increase this
 number.
source :
http://www.linuxinsight.com/proc_sys_net_ipv4_tcp_max_syn_backlog.html




Script.January/HPUX11/GEN003600 - 11 identical
    12: # 6.10.06 JM created initial check.
    13: # 9.20.06 JMazz chnage net.ipv4.tcp_max_syn_backlog test condition
    14: #         from -ne to -lt and the test value from 0 to 1280.
   158:   # "9.20.06:Code mod."
   159:   if [ `sysctl -a |grep "net.ipv4.tcp_max_syn_backlog" | awk -F"=" '{print $2}'` -lt 1280 ]
   160:   then
iase.disa.mil/stigs/SRR/UNIX_51-15January07.tar.bz2 - Unknown - Shell



Testing Response to a SYN Flood Attack
-- a selection follows

Also after the system is started, the value 0 must be
written in the /proc file system into the pseudo file
/proc/sys/net/ipv4/tcp_max_syn_backlog. This specifies
the maximum number of pending connection requests
allowed. When it equals 0, only one connection request
may be pending.

source :
Verifying TCP Implementation
Fang Fang
University of New Brunswick
POBox 4400
(506) 453-4566
(506) 453-4566
John M. DeDourek
University of New Brunswick
POBox 4400
(506) 453-4566
(506) 453-4566
q2a6z@unb.ca
dedourek@unb.ca