Testing TCP connection
Create TCP listener:
$ nc -l 9999
Create TCP Client:
$ nc -vt 192.168.5.12 9999
Ncat: Version 6.40 ( http://nmap.org/ncat )
Ncat: Connected to 192.168.5.12:9999.
Testing UDP connection
Create UDP listener:
$ nc -ul 9999
Create UDP Client:
$ nc -vu 192.168.5.12 9999
Ncat: Version 6.40 ( http://nmap.org/ncat )
Ncat: Connected to 192.168.5.12:9999.
Test UDP Connection...
Monday, November 28, 2016
Friday, November 4, 2016
Thursday, November 3, 2016
sysctl to change kernel system settings
To list all settings configurable in the /proc/sys/ directory:
/sbin/sysctl
-a
To assign values to writable files in the
/proc/sys/ directory:
sysctl -w [parameter] = [value]
Example:
sysctl -w kernel.sysrq="1"
This only works for testing purposes. Special settings within /proc/sys/ are lost when the
machine is rebooted. To preserve custom settings, add them to the /etc/sysctl.conf...
IPC Queues - ENOSPC (No space left on device) error
ENOSPC returns from msgget indicates that the system-wide maximum number of message queues has been reached.
Solution:
Change this limit editing:
/proc/sys/kernel/msg...
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