[LARTC] Problem with routing,NAT and proxy arp

[LARTC] Problem with routing,NAT and proxy arp

[M.F. PSIkappa]

Hello,
I'd like to NATed some friends boxes into our network.

[ISP Router]---(Corp. LAN)---[[MY BOX with NAT]]-----(lan with friends)
1.1.1.1/24                     1.1.1.4/24 eth0           172.18.1.0/24
			     172.18.1.254/24 eth1

My seting:
I use kernel 2.4.2, iptables version 1.2

root@pokus:~# iptables -t nat -L -n               
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination         
DNAT       all  --  0.0.0.0/0            1.1.1.17     to:172.18.1.4 

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination         
SNAT       all  --  172.18.1.4           0.0.0.0/0    to:1.1.1.17 

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination 

I add arp proxy on eth0 with
ip neigh add proxy 1.1.1.17 dev eth0
With command arp -a -n I see this arp proxy but with ip neigh show I don't
see this one.

I test connection with ping, in tcpdump output I see that 172.18.1.4 is
right NATed to 1.1.1.17 and icmp request go out to the Corp. LAN.
I think that something is wrong with proxy arp because ping from some box
on Corp. LAN don't reach 1.1.1.17

What's wrong on my setup ?

PSIkappa
psi@atlantis.sk


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