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