Multiple ip on same class

Hello, I want to use two IP of same class on the same machine, for example:

eth1 = 1.1.1.244

eth2 = 1.1.1.245

both eth use same gw

I can't use ip-alias because is mapped via mac address

if i bring online the first ip the second ip is not reachable and viceversa

I tried using /28 and /32 but don't work

I use centos 7

How i can make both ip to be reachable?

ifcfg-eth1

TYPE="Ethernet"

BOOTPROTO="static"

IPADDR="XXX.XXX.XXX.244"

NETMASK="255.255.255.240"

GATEWAY="XXX.XXX.XXX.254"

BROADCAST="XXX.255.255.244"

DEFROUTE="yes"

PEERDNS="yes"

PEERROUTES="yes"

IPV4_FAILURE_FATAL="no"

IPV6INIT="yes"

IPV6_AUTOCONF="yes"

IPV6_DEFROUTE="yes"

IPV6_PEERDNS="yes"

IPV6_PEERROUTES="yes"

IPV6_FAILURE_FATAL="no"

NAME="eth1"

UUID="XXXXX"

DEVICE="eth1"

ONBOOT="yes"

ZONE="public"

ifcfg-eth2

TYPE="Ethernet"

BOOTPROTO="static"

IPADDR="XXX.XXX.XXX.245"

NETMASK="255.255.255.240"

GATEWAY="XXX.XXX.XXX.254"

BROADCAST="XXX.255.255.245"

DEFROUTE="yes"

PEERDNS="yes"

PEERROUTES="yes"

IPV4_FAILURE_FATAL="no"

IPV6INIT="yes"

IPV6_AUTOCONF="yes"

IPV6_DEFROUTE="yes"

IPV6_PEERDNS="yes"

IPV6_PEERROUTES="yes"

IPV6_FAILURE_FATAL="no"

NAME="eth2"

UUID="XXXXX"

DEVICE="eth2"

ONBOOT="yes"

ZONE="public"

Thanks