Hi!! i have latest shorewall installed (4.6.1.1) with centos 6.5 x64 in nat file have IP1 eth1:1 X1 no no IP2 eth1:2 X2 yes no IP3 eth1:3 X3 no no IP4 eth1:4 X4 yes no #IP5 eth1:5 X5 no no in the rules file have rules like: HTTP(ACCEPT) wan lan:X2 eth1 is the wan and eth0 is the lan ifconfig and ip addr show dev eth1 show ok the info. but when eth1:5 is up and nat is activated the info for this device change and nat dont work ifconfig eth1:5 before nat eth1:5 Link encap:Ethernet HWaddr 00:25:90:67:06:C7 inet addr:IP5 Bcast:xxx.xxx.xxx.xxx Mask:255.255.255.240 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Memory:fbd60000-fbd80000 ifconfig eth1:5 after nat eth1:5 Link encap:Ethernet HWaddr 00:25:90:67:06:C7 inet addr:IP5 Bcast:0.0.0.0 Mask:255.255.255.255 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Memory:fbd60000-fbd80000 ?ip addr show dev eth1 inet IP5/32 scope global eth1:5 net IP5/28 brd xxx.xxx.xxx.xxx scope global secondary eth1:5 Some idea why!? ------------------------------------------------------------------------------ HPCC Systems Open Source Big Data Platform from LexisNexis Risk Solutions Find What Matters Most in Your Big Data with HPCC Systems Open Source. Fast. Scalable. Simple. Ideal for Dirty Data. Leverages Graph Analysis for Fast Processing & Easy Data Exploration http://p.sf.net/sfu/hpccsystems