oguzdev35

cat > "/etc/udev/rules.d/99-human_readable_usb.rules" << EOF_USB_RULES
SUBSYSTEM=="tty", ENV{ID_PATH}=="platform-3f980000.usb-usb-0:1.2:1.0", SYMLINK+="ttyUSBUpperLeft"
SUBSYSTEM=="tty", ENV{ID_PATH}=="platform-3f980000.usb-usb-0:1.3:1.0", SYMLINK+="ttyUSBLowerLeft"
SUBSYSTEM=="tty", ENV{ID_PATH}=="platform-3f980000.usb-usb-0:1.4:1.0", SYMLINK+="ttyUSBUpperRight"
SUBSYSTEM=="tty", ENV{ID_PATH}=="platform-3f980000.usb-usb-0:1.5:1.0", SYMLINK+="ttyUSBLowerLeft"
EOF_USB_RULES
udevadm control --reload-rules

oguzdev35

Detecting and Mitigating DDOS Attacks

#List all Finish (FIN) packets
machine1 : sudo /usr/sbin/tcpdump -Nnn -i any -s0 'tcp[13] & 1 != 0'


#List all SYN and SYN-ACK packets
machine1 : sudo /usr/sbin/tcpdump -Nnn -i any -s0 'tcp[13] & 2 != 0' 

oguzdev35

1) Connect your mobile device via usb (just this once)

2) Establish a port with your mobile device using 'adb tcpip <port number>'.
eg. adb tcpip 5555

3) Remove USB and 'adb connect <mobile device ip><above mentioned port number>' .
Eg . adb connect 192.160.0.124:5555

4) 'React-native run-android'  in your project folder 

oguzdev35

Sample config for 2 million web socket connection

    sysctl -w fs.file-max=12000500
    sysctl -w fs.nr_open=20000500
    # Set the maximum number of open file descriptors
    ulimit -n 20000000

    # Set the memory size for TCP with minimum, default and maximum thresholds 
 sysctl -w net.ipv4.tcp_mem='10000000 10000000 10000000'