[LARTC] help on iproute2

Linux Advanced Routing and Traffic Control

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hi guys .. I'm linux newbie
I have LAN that connected to internet.
here is the pic :

[internet]----------[Linux]----------[LAN]
    |                  |               |
202.149.83.192-207  202.149.83.194   192.168.0.1-35

with RedHat Linux 2.4.18, how can I make every 4 ip on
LAN will be 1 ip on the internet ? (sorry abt my
english )
example: 

192.168.0.1-4 ---> 202.149.83.195
192.168.0.4/30 --> 202.149.83.196
192.168.0.8/30 --> 202.149.83.197
.
.
.

with my old linux (2.2.16) ..
I use :
modprobe dummy
ifconfig dummy0 202.149.83.195 netmask 255.255.255.240
ifconfig dummy0:1 202.149.83.196 netmask
255.255.255.240
ifconfig dummy0:2 202.149.83.197 netmask
225.255.255.240
.
.
.
ip rule add from 192.168.0.0/30 nat 202.149.83.195
ip rule add from 192.168.0.4/30 nat 202.149.83.196
ip rule add from 192.168.0.8/30 nat 202.149.83.197
.
.
.

but It's NOT WORKING on my new 2.4.18 Linux.
what should I do ?
Thanks before
Yours

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