Hi, I have been examining the possibility of allowing some external hosts (red-hat 6.2 with lpd)to print to some of our internal printers (HP-JetDirect) through my firewall in company which firewall machine is red-hat 7.2 using iptables . Anyone knows which ports need to be open?? I tried open 515 only with NAT in iptables , it 's not work
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