Of course I did enable with 
"echo 1 >/proc/sys/net/ipv4/conf/eth0/proxy_arp" :-) check my original
message.
I'm talking about NETMASK proxy arp, not enable-disable.
And the question still remains: 
Why not netmasks ????

It used to work in 2.0.x but in 2.2.x arp.c:

int arp_req_set(struct arpreq *r, struct device * dev)

[.cut text.]

 u32 mask = ((struct sockaddr_in *) &r->arp_netmask)->sin_addr.s_addr;
 if (mask && mask != 0xFFFFFFFF)
    return -EINVAL;

Which means DO NOT ALLOW setting of proxy-arp NETMASKS, and this is the
error you get from arp: INVALID.... 

_WHY_ ???

Bye, Nir.

On Sun, 13 Jun 1999, David S. Miller wrote:

>    Date: 	Sun, 13 Jun 1999 13:06:33 +0300 (IDDT)
>    From: Nir Yeffet <nir@inbalsoft.com>
> 
>    I found. there's no netmask in neighbour.c. kernel is not doing
>    proxy arp netmask anymore. WHY ????????
> 
> Have you turned on the proxy_arp sysctl for your devices which you
> want to do proxy-arp'ing?  ie.
> 
> bash# echo "1" >/proc/sys/net/ipv4/conf/eth0/proxy_arp
> 
> Later,
> David S. Miller
> davem@redhat.com
> 



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