redhat 6.2 and NAT with iproute

Hi

My network is 172.22.72.x. One machine (172.22.72.60) has a
modem. The IP 172.22.72.59 is free. At the other end of the
RTC line theres a web server called 172.18.48.169.

I'd like to be able to connect to this web server from one
client on my network using the .59 address, being redirected
by .60 through the modem to the web server.

ipchains can't do DNAT, so I installed iproute from the CD.

The doc says I should type:
ip route add nat 172.22.72.59 via 172.18.48.169

But I get this error:
RTNETLINK answers: Invalid argument

What am I doing wrong ?

ip route show output:
172.18.48.169 via 172.18.48.169 dev sl0
172.18.48.169 dev sl0 scope link src 192.168.60.15 metric 1
172.22.72.60 dev eth0 scope link
172.22.72.0/24 dev eth0 proto kernel scope link src 172.22.72.60
127.0.0.0/8 dev lo scope link
default via 172.22.72.136 dev eth0
default dev sl0 scope link src 192.168.60.15 metric 1

ifconfig output:
eth0 Link encap:Ethernet HWaddr 00:02:B3:0C:F2:A1
inet addr:172.22.72.60 Bcast:172.22.72.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3 errors:0 dropped:0 overruns:0 frame:0
TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
collisions:3 txqueuelen:100
Interrupt:17 Base address:0x9000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:3924 Metric:1
RX packets:22 errors:0 dropped:0 overruns:0 frame:0
TX packets:22 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0

sl0 Link encap:Serial Line IP
inet addr:192.168.60.15 P-t-P:172.18.48.169 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:10

route -n output:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
172.18.48.169 172.18.48.169 255.255.255.255 UGH 0 0 0 sl0
172.18.48.169 0.0.0.0 255.255.255.255 UH 1 0 0 sl0
172.22.72.60 0.0.0.0 255.255.255.255 UH 0 0 0 eth0
172.22.72.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 172.22.72.136 0.0.0.0 UG 0 0 0 eth0
0.0.0.0 0.0.0.0 0.0.0.0 U 1 0 0 sl0


(I know I'd better upgrade this machine and use iptables but
it's impossible, due to many bad reasons.)

Thanks for any input !
--
TTK
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In article <2003731-171810-(E-Mail Removed)>, TTK wrote:
> ipchains can't do DNAT, so I installed iproute from the CD.

I don't know about iproute2 for this ... I used to use ipmasqadm. This
is documented in the IP Masquerade HOWTO ... if they don't still have
kernel 2.2.x information, look for an older version of it (it might have
been a mini-HOWTO in those days.)
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