[CentOS] Network configuration issue with second public ip on CentOS 6

[Louis Lagendijk]

On Wed, 2015-12-23 at 19:04 +0100, Patrick Bervoets wrote:
> 
> > Op 23 dec. 2015 om 18:31 heeft Valeri Galtsev <galtsev at kicp.uchicag
> > o.edu> het volgende geschreven:
> > 
> > 
> > > 
> > 
> > If I understand IP networking correctly, you only can have
> > "aliases" of
> > the interface appear on the _same_ network segment (I'm tempted to
> > say
> > same class C network) as the main IP of interface, say you have:
> > 
> > DEVICE=eth0
> > IPADDR=x.y.z.w
> > NETMASK=255.255.255.0
> > GATEWAY=x.y.z.254
> > 
> > Then with the restriction I mentioned you can have alias:
> > 
> > DEVICE=eth0:0
> > IPADDR=x.y.z.a
> > NETMASK=255.255.255.255
> > 
> > Note that "x.y.z." part is the same in both IPs.
> > 
> > Somebody may correct me if I'm wrong.
> > 
> > Valeri
> > 
> > > 
> > > 
> I have used an 10. Alias on a 192. Interface so it is possible
> Patrick

I believe you are right. A netmask of 255.255.255.255 however seems
wrong. With that netmask a broadcast for address resolution will not
work... 
Louis