Linux DDoS Hardening

If you server is under ddos attack, please harden  sysctl.conf and install apf ,ddos deflate.
==================
Hardening of sysctl.conf

servertechs# nano -w  /etc/sysctl.conf

Add this to the /etc/sysctl.conf

#  Enable IP spoofing protection, turn on Source Address Verification
net.ipv4.conf.all.rp_filter = 1
# Enable TCP SYN Cookie Protection
net.ipv4.tcp_syncookies = 1
Add the below code in /etc/rc.local and restart network
for f in /proc/sys/net/ipv4/conf/*/rp_filter;
do echo 1 > done
echo 1 > /proc/sys/net/ipv4/tcp_syncookies

==================
Installation DDoS Deflate
This works with apf to block  ips , ensure that you have apf installed on the server.
Installation:

wget http://www.inetbase.com/scripts/ddos/install.sh
chmod 0700 install.sh
./install.sh

Vodafone Smart Prime 6 - VN-895F - unbrick

Vodafone Smart Prime 6 ( VN-895F )
unbrick + root + custom ROM

 

:: Links ::

Stock ROM              https://uloz.to/!AVVOAqRbDIZr/lrx22g-v9w7n-0-zip

CyanogenMod 12.1 https://uloz.to/!pvfevRcsH6fI/cm-lmy49j-vf-895n-zip

TWRP 3.0.0.2          https://uloz.to/!NBdIpS4zH3X6/twrp-3-0-2-0-vf895n-img

Flashify (google play)

:: HowTO ::

- Get into Recovery mode (Power + Vol Up)

- English, Write Protect Switch off, reboot

- when back in OS - download Kingoroot, install and "Start Root"

- you might decline the security checks, i let them working

- download the Stock ROM 5.0.2 / multilanguage

- download the TWRP recovery

> https://uloz.to/!NBdIpS4zH3X6/twrp-3-0-2-0-vf895n-img <

- copy both on SD card ( /external_sd ) 

- you can use ADB - push + shell or mount the phone directly

- download + install Flashify

- backup your kernel + recovery with Flashify and flash TWRP recovery

- reboot into TWRP (Power + Vol Up)

- you are in the touch-based recovery GUI with access to terminal etc. ...

- wipe everything (Advanced) except your /external_sd 

- so wipe out /system, /data, /cache, /Dalvik

- in case of error - repeat with repair fs before wipe

- install Stock ROM / LRX22G-w9V7N ( 5.0.2 multilingual CZ )

> https://uloz.to/!AVVOAqRbDIZr/lrx22g-v9w7n-0-zip <

- wipe cache + Dalvik and reboot

- this Stock ROM is without bloatware and extra apps, just basics

*** you can use this ROM as it is stable and fast ***

- if you want you can try unofficial CM 12.1 (5.1.1)

> https://uloz.to/!pvfevRcsH6fI/cm-lmy49j-vf-895n-zip <

 - wifi / sim card / 2g,3g,4g working / buttons LEDs working / flashlight LED working

- but getting unstable after 2-3 days ...unfortunatelly

 

:: Final TIPS ::

- - BACKUP! kernel, rom, OS - just everything!

- in case that you see device Aquaris E5, manufacturer BQ - no stress ;o)

- give it a little longer time after flashing Stock ROM or Cyanogen 

- 15-20mins  it will be looking like nothing is happening

*ad ADB 

- for ADB to work - your device will need to show up as:

usb 2-5: new high-speed USB device number 119 using xhci_hcd
usb 2-5: New USB device found, idVendor=18d1, idProduct=4ee2
usb 2-5: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 2-5: Product: VF895N
usb 2-5: Manufacturer: Vodafone
usb 2-5: SerialNumber: xxxxxxxx 

- if it shows as :

usb 2-5: new high-speed USB device number 121 using xhci_hcd
usb 2-5: New USB device found, idVendor=05c6, idProduct=9008
usb 2-5: New USB device strings: Mfr=0, Product=2, SerialNumber=0
usb 2-5: Product: QHSUSB__BULK
qcserial 2-5:1.0: Qualcomm USB modem converter detected
usb 2-5: Qualcomm USB modem converter now attached to ttyUSB0 

- it means it is in pre-booting process - get into recovery to move away from loop

 

Enjoy@!