IPTABLES - limit access to port 3306 to local ip block

I have a couple of machines on a lan I want those machines to be able to access port 3306 (mysql) on one of the machines, but I do not want outside to be able to see that port open
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http:// thevpn.guruCommented:
iptables -A INPUT -p tcp --dport 3306 --source Ip.of.machine.A -j ACCEPT
add this rule as many times as needed and only the machines with this source IP will be able to access it. You need to provide more info if you want the exact rule.

I.e. are the client machines on the internet..does your server have a public IP,
You can also add nets to the source like:

// allow following ip/hosts to connect:
// connections from the local machine
iptables -A INPUT -p tcp --dport 3306 --source -j ACCEPT
//connections from the local lan
iptables -A INPUT -p tcp --dport 3306 --source -j ACCEPT

// reject all other connections
iptables -A INPUT -p tcp --dport 3306 -j REJECT

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Len45Author Commented:
Thank you both

All machines are connected to Internet via NAT -- and are on a 192 LAN, so I like hernst42 answer since I can add all current and possible servers with two lines of code.  I will spllit points
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