On Tue, 2003-02-18 at 10:52, John Nall wrote:
> There is something I can't seem to grasp, and so far I have not found the
> answer. I'm trying to ween myself away from Windows and migrate to Linux
> (for several reasons) but gosh it sure is not easy to do even when one is
> determined. How in the world do you accomplish ICS???
Just do the following.
1. Set the your client machines to use the ethernet IP address of your
Linux firewall/gateway as their default gateway. This can be done
manually on each machine, or you could setup DHCP on your Linux box (see
step 4 below)
2. Configure IP masquerading on your Linux box. You said you were using
a modem. The following commands will be sufficient:
# iptables -F
# iptables -t nat -F
# iptables -A INPUT -i ppp0 -m state --state ESTABLISHED,RELATED -j ACCEPT
# iptables -A INPUT -i ppp0 -j DROP
# iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
# service iptables save
# echo "modprobe ip_nat_ftp" >> /etc/rc.local
# perl -e 's/forward = 0/forward = 1/' -pi /etc/sysctl.conf
# echo 1 > /proc/sys/net/ipv4/ip_forward
3. Optionally, setup a caching DNS server on your box for your clients
to use.
Install RPM package: bind and caching-name server, then run:
# chkconfig named on
# service named on
4. Optionally, setup a DHCP server. Let's assume that you are using
192.168.69.0/255.255.255.0 as your internal network. Let's assume that
your Linux box's ethernet address is 192.168.69.1.
Install the RPM package: dhcp
Create the file /etc/dhcpd.conf with the following contents:
ddns-update-sytle none;
subnet 192.168.69.0 netmask 255.255.255.0 {
option routers 192.168.69.1;
option subnet-mask 255.255.255.0;
option domain-name-servers 192.168.69.1;
range 192.168.69.100 192.168.69.200;
}
Then run start the DHCP server and make sure it will run at boot time:
# service dhcp start
# chkconfig dhcp on
Note: I did all this from memory, so you may want check the dhcpd.conf
syntax against the man page. I think it's right though.
Dax Kelson
Guru Labs
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