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VPS Ubuntu 10.10 config (4) iptables

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(1)   Enable IP forwarding in linux    

   echo 1 > /proc/sys/net/ipv4/ip_forward

      Set  net.ipv4.ip_forward = 1 in  /etc/sysctl.conf:

 

(2)  Enable NAT for the subnet of OpenVPN

   sudo iptables -t nat -A POSTROUTING -s 10.168.100.0/24 -o eth0  -j MASQUERADE
   sudo iptables -t nat -A POSTROUTING -s 10.168.200.0/24 -o eth0  -j MASQUERADE

 

(3) Keep iptables

 sudo bash -c "iptables-save > /etc/iptables.rules"

 

(4) Auto start on boot by add the following lines into /etc/network/interfaces:

auto eth0
iface eth0 inet XXXX
  pre-up iptables-restore < /etc/iptables.rules

 

Ubuntu 10.04/Lucid Kernel Rebuild

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https://help.ubuntu.com/community/Kernel/Compile

 

Install tool:

sudo apt-get install fakeroot build-essential crash kexec-tools 
  makedumpfile kernel-wedge
sudo apt-get build-dep linux
sudo apt-get install git-core libncurses5 libncurses5-dev 
  libelf-dev asciidoc binutils-dev

 

Download the source archive

sudo apt-get build-dep --no-install-recommends linux-image-$(uname -r)
apt-get source linux-image-$(uname -r)

 

Change to source directory & Make scripts executable 

cd linux-2.6.32/

sudo chmod -R u+x debian/scripts/*

 

Modify code

……

 

Update config

debian/rules updateconfigs

 

Build kernel

sudo fakeroot debian/rules clean
AUTOBUILD=1 NOEXTRAS=1 DEB_BUILD_OPTIONS=parallel=2 sudo 
  fakeroot debian/rules binary-generic
 
 

Trigger Rebuild

sudo rm debian/stamps/stamp-build-generic
AUTOBUILD=1 NOEXTRAS=1 DEB_BUILD_OPTIONS=parallel=2 sudo 
 fakeroot debian/rules binary-generic
 
 

Build Result 

Located in parent directory:
 

Install new kernel

sudo dpkg -i linux-headers-2.6.32-30-generic_2.6.32-30.59_amd64.deb
sudo dpkg -i linux-image-2.6.32-30-generic_2.6.32-30.59_amd64.deb
 

Check new kernel

        ls /usr/src
        ls /boot