1997-04-03 10:22:02 +00:00
|
|
|
These are Instructions for Configuring A FreeBSD Box For NAT
|
|
|
|
|
After you have installed IpFilter.
|
|
|
|
|
|
|
|
|
|
You will need to change three files:
|
|
|
|
|
|
|
|
|
|
/etc/rc.local
|
1997-12-27 20:00:13 +00:00
|
|
|
/etc/rc.conf
|
1997-04-03 10:22:02 +00:00
|
|
|
/etc/natrules
|
|
|
|
|
|
|
|
|
|
You will have to:
|
|
|
|
|
|
|
|
|
|
1) Load the kernel module
|
|
|
|
|
2) Make the ipnat rules
|
|
|
|
|
3) Load the ipnat rules
|
|
|
|
|
4) Enable routing between interfaces
|
|
|
|
|
5) Add static routes for the subnet ranges
|
|
|
|
|
6) Configure your network interfaces
|
|
|
|
|
7) reboot the computer for the changes to take effect.
|
|
|
|
|
|
|
|
|
|
The FAQ was written by Chris Coleman <chris@@bbcc.ctc.edu>
|
|
|
|
|
This was tested using ipfilter 3.1.4 and FreeBSD 2.1.6-RELEASE
|
|
|
|
|
_________________________________________________________
|
|
|
|
|
1) Loading the Kernel Module
|
|
|
|
|
|
|
|
|
|
If you are using a Kernal Loadable Module you need to edit your
|
|
|
|
|
/etc/rc.local file and load the module at boot time.
|
|
|
|
|
use the line:
|
|
|
|
|
|
|
|
|
|
modload /lkm/if_ipl.o
|
|
|
|
|
|
|
|
|
|
If you are not loading a kernel module, skip this step.
|
|
|
|
|
_________________________________________________________
|
|
|
|
|
2) Setting up the NAT Rules
|
|
|
|
|
|
|
|
|
|
Make a file called /etc/natrules
|
|
|
|
|
put in the rules that you need for your system.
|
|
|
|
|
|
|
|
|
|
If you want to use the whole 10 Network. Try:
|
|
|
|
|
|
|
|
|
|
map fpx0 10.0.0.0/8 -> 208.8.0.1/32 portmap tcp/udp 10000:65000
|
|
|
|
|
|
|
|
|
|
_________________________________________________________
|
|
|
|
|
Here is an explaination of each part of the command:
|
|
|
|
|
|
|
|
|
|
map starts the command.
|
|
|
|
|
|
|
|
|
|
fpx0 is the interface with the real internet address.
|
|
|
|
|
|
|
|
|
|
10.0.0.0 is the subnet you want to use.
|
|
|
|
|
|
|
|
|
|
/8 is the subnet mask. ie 255.0.0.0
|
|
|
|
|
|
|
|
|
|
208.8.0.1 is the real ip address that you use.
|
|
|
|
|
|
|
|
|
|
/32 is the subnet mask 255.255.255.255, ie only use this ip address.
|
|
|
|
|
|
|
|
|
|
portmap tcp/udp 10000:65000
|
|
|
|
|
tells it to use the ports to redirect the tcp/udp calls through
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
The one line should work for the whole network.
|
|
|
|
|
_________________________________________________________
|
|
|
|
|
3) Loading the NAT Rules:
|
|
|
|
|
|
|
|
|
|
The NAT Rules will need to be loaded every time the computer
|
|
|
|
|
reboots.
|
|
|
|
|
|
|
|
|
|
In your /etc/rc.local put the line:
|
|
|
|
|
|
|
|
|
|
ipnat -f /etc/natrules
|
|
|
|
|
|
|
|
|
|
To check and see if it is loaded, as root type
|
|
|
|
|
ipnat -ls
|
|
|
|
|
_________________________________________________________
|
|
|
|
|
4) Enable Routing between interfaces.
|
|
|
|
|
|
|
|
|
|
Tell the kernel to route these addresses.
|
|
|
|
|
|
|
|
|
|
in the rc.local file put the line:
|
|
|
|
|
|
|
|
|
|
sysctl -w net.inet.ip.forwarding=1
|
|
|
|
|
|
|
|
|
|
_________________________________________________________
|
|
|
|
|
5) Static Routes to Subnet Ranges
|
|
|
|
|
|
|
|
|
|
Now you have to add a static routes for the subnet ranges.
|
|
|
|
|
Edit your /etc/sysconfig to add them at bootup.
|
|
|
|
|
|
|
|
|
|
static_routes="foo"
|
|
|
|
|
route_foo="10.0.0.0 -netmask 0xf0000000 -interface 10.0.0.1"
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
_________________________________________________________
|
|
|
|
|
6) Make sure that you have your interfaces configured.
|
|
|
|
|
|
|
|
|
|
I have two Intel Ether Express Pro B cards.
|
|
|
|
|
One is on 208.8.0.1 The other is on 10.0.0.1
|
|
|
|
|
|
|
|
|
|
You need to configure these in the /etc/sysconfig
|
|
|
|
|
|
|
|
|
|
network_interfaces="fxp0 fxp1"
|
|
|
|
|
ifconfig_fxp0="inet 208.8.0.1 netmask 255.255.255.0"
|
|
|
|
|
ifconfig_fxp1="inet 10.0.0.1 netmask 255.0.0.0"
|
|
|
|
|
_________________________________________________________
|
