[Techtalk] Need Help in IPTABLES

[Mohammad Shakir]

Dear Friends,

I have Installed Red Hat Linux 7.3 with hostname SERVER1 ipaddress 
192.168.0.1 and also configure squid, DHCP, DNS services all are running 
well. I have also 30 PCs of windows 98 as a client with auto ip and set 
their gateway,dns,dhcpserver and so on from DHCP 192.168.0.1.

Now I want that any request for browsing come from client  automatically 
forward to my squid which is running on 3128 port and all others request go 
on direct ppp0 for this I configured one script which is given below.

Is this script correct or not ?

echo 1 > /proc/sys/net/ipv4/ip_forward

/sbin/iptables --flush
/sbin/iptables --table nat --flush
/sbin/iptables --delete-chain
/sbin/iptables --table nat --delete-chain

/sbin/iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT 
--to-port 3128
/sbin/iptables --table nat --append POSTROUTING -s 192.168.0.1/24 
--out-interface ppp0 -j MASQUERADE
/sbin/iptables --append FORWARD --in-interface eth0 -j ACCEPT

This is other setup.

I have setup two servers hostname server1 ip address 192.168.0.1 and 
hostname server2 ipaddress 192.168.0.2 both servers are connected with 
dialup sepratly and also configure squid, DHCP, DNS services. I have also 
100 PCs of windows 98 as a client with auto ip and set their 
gateway,dns,dhcpserver and so on from DHCP 192.168.0.1.

Now I want that any request for browsing come from client  automatically 
forward to my squid which is running on 3128 port on server 192.168.0.2 and 
all others request go on direct ppp0 of 192.168.0.1. Please help my what 
script I make for this.

I hope you will help me in this regard.



Thanks

MOHAMMAD SHAKIR





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