I have two servers running Linux. Server A is SAMBA domain controller and Server B is MAIL server(qmail) My Server A has two NIC. One two my ISP(172.16.57.188/30) and the other to my LAN.(172.16.19.0/24) Server A LAN IP = 172.16.19.230 Server A ISP IP = 172.16.57.190 Server B IP = 172.16.19.231 Server B also has a dial up option for backup if ISP is down I have attached my iptable script. http://s59.yousendit.com/d.aspx?id=...GF23Y94C8R092VF If i set default INPUT Policy to DROP then incoming Mail stop coming. I add a rule at the end of the script: ipt -A -s 0/0 -d $LAN_IP -j REJECT The above rule will also block nmap port scans. I am not a pro in iptables. Just know scripting and adding intermediate level rules.Please let me know how to fix this Thanks Best Regards, Sameer Bagwe -- Only The Inquiring Mind Solves Problems !
