[qmailtoaster] iptables question

[Scott Hughes]

I am trying to allow mysql communications between two of my servers for 
replication purposes.  I have tried two iptables statements, but instead 
of allowing the communications, it stops all communications. I can no 
long ping the second server or SCP to it.  Very strange.  Here are the 
two things I've tried:

1) iptables -A INPUT -p tcp -m tcp --syn -s 66.232.241.121 --dport 3306 
-j ACCEPT

and

2) iptables -A INPUT -p tcp -m tcp --syn -s 66.232.241.121 -j ACCEPT

What am I doing missing here?

Thanks,
Scott