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Old 01-10-2002, 05:25 PM   #1
ck571
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Registered: Dec 2001
Location: Buffalo NY
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Unhappy IP masquerading and firewall with Red Hat 7.2


I'm setting up a Linux box as a server to several Windows 2000 machines using Red Hat 7.2.

I realize that this edition of Red Hat does not come with a lot of the nice GUI's.

I've got two problems.


(1) I'm trying to set IP masquerading to allow my Windows clients to access the Internet, using iptables. I have been searching everywhere for documentations on this, but they don't really work.

(2) The default firewall settings with iptables seems to block everything. I couldn't even ping anywhere with it. Does anyone know how I can go about this?

I really appreciate any replies. It's driving me nuts :O)
 
Old 01-10-2002, 06:46 PM   #2
theFuzzyOne
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iptables

iptables will do masq'ing well. i was able to find tuns of example on google.com . also, check your xinetd setting to see if it's disabled anything.

here's a simple setup:

# Flush all tables
iptables -F; iptables -t nat -F; iptables -t mangle -F

#set default policies
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT

try this at the end of your iptables scripts:

#### NAT ROUTING
iptables -t nat -A POSTROUTING -o <interface> -j MASQUERADE
 
Old 01-10-2002, 06:49 PM   #3
theFuzzyOne
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gui tools

one more thing : rh7.2 comes with lots of gui tools! fire up gnome or kde and explore!
 
Old 01-11-2002, 11:24 AM   #4
ck571
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iptables

Thanks for the reply.

Do I save these under /etc/sysconfig/iptables?

I've tried doing the following commands on the cli, and it works.


iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to 192.168.0.252

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE


Do you know where I can find information on firewall rules? I saw some pretty hairy examples out there, and I do not know the purposes of all the different ports that they are using.
 
Old 01-11-2002, 11:00 PM   #5
neo77777
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about ports stuff see you /etc/services file
 
Old 03-21-2002, 02:59 AM   #6
ibadoi
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Registered: Mar 2002
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Forwarding with iptables

On eth0, to Internet I put squid (proxy server) and on eth1, to inside I put DHCP Server!
The default firewall settings with iptables seems to block everything (only squid on port 80 is on). Does anyone know how I can forward services from eth1 to eth0?
 
  


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