danish-rehman

>> ethtool -g eth1

danish-rehman

>> ethtool -i eth2
   driver: e1000e
   version: 2.3.2-k
   firmware-version: 5.10-2
   bus-info: 0000:03:00.1
   supports-statistics: yes
   supports-test: yes
   supports-eeprom-access: yes
   supports-register-dump: yes

danish-rehman

# Linux source code
>> cd linux-3.16
# File : /net/core/dev.c
>> vim /net/core/dev.c
   dev_hard_start_xmit()   
       printk(KERN_DEBUG "DANX: start %s:%s:%d\n" ,__FILE__ , __func__ ,__LINE__ );
   

danish-rehman

# Install dependency
>> sudo apt-get install libcap-dev
# Create directory for installed 
>> mkdir /proj/USC558L/exp/drehman/usr
# Download the legacy ntp source code
>> wget http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2/ntp-4.2.6p5.tar.gz
# Configure
>> ./configure --prefix=/proj/USC558L/exp/drehman/usr  --sysconfdir=/proj/USC558L/exp/drehman/etc  --enable-linuxcaps  --with-binsubdir=sbin --with-lineeditlibs=readline
# Compile
>> make

danish-rehman

# Go the directory containing the executables
>> cd /proj/USC558L/exp/drehman/usr/sbin
# l - path to the log file
# d - debug mode on
>> ./ntpd -l path_to_logfile -d

danish-rehman

# Edit the code
>> vim ntpd/ntpd_conf.c
>> make
>> make install

danish-rehman

# Change date on ubuntu
>> sudo date --set "8 Nov 2014 14:41:33"

danish-rehman

# Install NTP from ubuntu repository
>> sudo apt-get install ntp

# View all the NTP master and their offset recieved
>> ./ntpd -p

# Exactly like the above command but with no ip address rather then name
>> ./ntpd -n

# Query a NTP master server

danish-rehman

# Change master NTP server
>> vim /etc/ntp.conf
   server node2.test1.usc558l

# Change source code for ntpupdate
>> vim ntpdate / ntpdate.c
   grep "static int clock_adjust(void)"

# Change source code to stop NTP from changing time
# Add "return 0" as soon as the function 

danish-rehman

# Defaults to 256 descriptors
>> ethtool -g eth4
   Ring parameters for eth4:
   Pre-set maximums:
   RX:	        4096
   RX Mini:	   0
   RX Jumbo:	  0