I have 1 set of 30 public IP's with a netmask of 255.255.255.0 and another set of 30 IP's with a netmask of 255.255.255.128. Both sets of IP's also have different gateways. How can I virtually assign the IP's to the machine?

I have tried creating ifcfg-eth0:0 ifcfg-eth0:1 ifcfg-eth0:X ect for each IP. Below is my ifcfg file with. I have this for each IP with the correct gateway IP and netmask for each of my 60 IP's. If I do ip addr show it does show all of the 60 addresses with the correct broadcast IP and netmask.

However I can only use 30 of my IP's that are from the same netmask. Am I doing this correctly? If the IP's show up with ip addr show does that mean I have correctly assigned them to the machine virtually? I want to check before I blame my hosting company for not routing the IP's correctly.

DEVICE="eth0:1"
BOOTPROTO="static"
DNS1="**.**.**.**"
DNS2="**.**.**.**"
GATEWAY="2**.**.***.126"
HOSTNAME="localhost.localdomain"
HWADDR="0*:19:**:**:**:**"
IPADDR="2**.*.**.**"
IPV6INIT="no"
MTU="1500"
NETMASK="255.255.255.128"
NM_CONTROLLED="yes"
ONBOOT="yes"
TYPE="Ethernet"

Also is there a better way to do this? I have used ifcfg-eth0:0-range1 before to assign a range of IP's from the same netmask. Is it possible to do this with ranges with different netmask?

Thanks!