NIC checksum offload enable/disable

To enable/disable NIC checksum offload:

[Windows]
   . Go to Control panel -> Network and Internet -> Network and Sharing Center
   . Click "Change adapter settings"
   . Right click on the NIC and select "Properties"
   . Click "Configure" -> Advanced tab
   . You will find
        . UDP Checksum Offload (IPv4)
        . TCP Checksum Offload (IPv4)
        . IPv4 Checksum Offload
   . Enable/disable could be done there.

Wireshark filter data in payload

. To filter packets with hex value "0xff 0x13" in payload

  frame contains ff:13

Change console resolution for CentOS permanently

vi /etc/grub.conf

append "vga=791" without the quotes to the kernel line

vi/vim settings

/etc/virc for vi
/etc/vimrc for vim
~/.vimrc

syntax on
set autoindent

set number

set sw=4
set tabstop=4
set cindent