following are my Linux router information

eth1= WAN IP= 110.88.89.66/32
Gateway= 110.88.89.65
eth0= LAN IP= 192.168.1.1/24

Chain POSTROUTING (policy ACCEPT)
target prot opt source destination
MASQUERADE all -- 0.0.0.0/0 0.0.0.0/0

routing table is

110.88.89.64 0.0.0.0 255.255.255.252
192.168.1.0 0.0.0.0 255.255.255.0
0.0.0.0 110.88.89.65 0.0.0.0

My ISP gave me IP Pool 110.88.90.68/29 to use this on my LAN.
my question is how can I use this IP pool on LAN side interface.
i think now its simple.

192.168.1.0 /24 is my LAN network and I can not change this, because i have near 180 PCs on my LAN.

Help require.

NETGUY.