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Re: natd and two nics

The script is fine if your internet link is on en0. If en1 is the one that talks to the internet then subsitute it in the natd and the ipfw divert rules. The interface that does not got to the internet would be the one that talks to the local network and that IP would appear in the router field of the interfaces on the LAN. If you say "natd -interface -dynamic en0" the interface will track the IP when the DHCP server changes it.


On Wednesday, July 31, 2002, at 07:09 AM, Matt Mashyna wrote:

I hate to ask because I'm sure it's been covered but I'm new to the list.
I want to use our G4 server as a firewall and proxy server -- to replace an aging linux box. I know I should get a hardware router but this is a school and you know how they are with money.

I set up DHCP to dish out a range of addresses for the PCI card (a DLink,
seems to work fine) ; the card is 10.0.0.1 and the range is 2 - 253. The internal ethernet is on a fractional T1 and it works going out.

I'm having trouble configuring natd and ipfw to get my DHCP clients out on the net. I tried installing geeroute which just seems to take a shot at setting up natd and ipfw. Of course it doesn't work. You can look at the config script and tell it won't. I tried to fiddle with some of the settings but I can't remember all I need to make this work. Here's the script:

#!/bin/sh
# Routing Script by QQ
ifconfig en0 alias 192.168.150.1 netmask 255.255.255.0

natd -interface en0

/sbin/ipfw -f flush
/sbin/ipfw add divert natd all from any to any via en0
/sbin/ipfw add allow ip from any to any

For one thing I don't think I want that first line because I have two ethernet devices. Second, the device should be en1 for the pci device. I think the real problem is with the ipfw rules. Can anyone offer advice ?

Thanks,
Matt

-- Matt Mashyna
Villa Maria Elementary
Erie, PA USA
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References: 
 >natd and two nics (From: Matt Mashyna <email@hidden>)



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