jiaoyk / linux_tcp_time_wait_patch

A Linux Kernel patch that changes the default TIME-WAIT duration.

TCP TIME-WAIT Patch

This Linux Kernel patch changes the default TIME-WAIT duration (60 seconds for Linux 5.4).

Applying the Patch

1. Download the Linux source tree linux-X.Y[.Z] in this directory:

$ wget https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-X.Y[.Z].tar.xz
$ tar -xvf linux-X.Y[.Z].tar.xz

2. Apply the patch:

$ cd linux-X.Y[.Z]
$ patch -p1 < ../patchfile_linux-X.Y[.Z]

Creating a New Patch

1. Download the Linux source tree linux-X.Y[.Z] in this directory:

$ wget https://cdn.kernel.org/pub/linux/kernel/vX.x/linux-X.Y[.Z].tar.xz
$ tar -xvf linux-X.Y[.Z].tar.xz

2. Copy it to linux-X.Y[.Z].original:

$ cp -R linux-X.Y[.Z] linux-X.Y[.Z].original

3. Modify the source code in linux-X.Y[.Z].
4. Create the new patch file:

$ diff -uNr linux-X.Y[.Z].original linux-X.Y[.Z] > patchfile_linux-X.Y[.Z]

Compiling the Kernel (on a Debian-based Distribution)

1. Download the Linux source tree linux-X.Y[.Z] and apply a patch.
2. Install the compilers and tools needed to build the Kernel:

$ sudo apt-get install build-essential libncurses-dev bison flex libssl-dev libelf-dev

3. Copy and edit the existing Linux configuration (or use make menuconfig):

$ cp -v /boot/config-$(uname -r) linux-X.Y[.Z]/.config

If copying from Ubuntu, read this.

4. Build the Kernel:

$ cd linux-X.Y[.Z]
$ make oldconfig
$ make -j $(nproc)

5. Install the Kernel modules:

$ sudo make modules_install

6. Install the Kernel:

$ sudo make install

7. Clean build object files:

$ make clean

8. Edit and update the Grub configuration:

$ sudo vi /etc/default/grub
$ sudo update-grub

9. Reboot the system:

$ sudo reboot

10. Check the new Kernel version:

$ uname -mrs

Developer

• Rodrigo Alves Lima ([e-mail])

License

Copyright (C) 2022 Rodrigo Alves Lima.

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.