On 02/08/2012 22:54, John R Pierce wrote: > On 08/02/12 12:45 PM, Scott Silva wrote: >> It doesn't work that way... You may think you bought 8 ip's, but you can only >> pass traffic on 6... That is how it works... You buy 16, and only 14 work. The >> first and last address are as Johnny said... > > I've also seen DSL networks like this where those extra IPs are bridged > not routed. in these cases, you use the same gateway as the 'main' IP, > but usually the main IP has a /24 or whatever mask that encompasses ALL > the IPs. > > regardless, the OP should contact the ISP and find out what the mask and > gateway are for the extra IPs. > > It's a bug in centos 6 http://bugs.centos.org/view.php?id=5391 PREFIX configured in ifcfg-eth0 is overrule the subnet mask in aliases. Solution: removed PREFIX from ifcfg-eth0 Thanks to all Levi