Thanks for your replies.
I have a problem with ethernet interface:
On eth0 interface I use freeradius and a pppoe server and eth0 haven't
ip addres.
eth0    Link encap:Ethernet  HWaddr 00:0x:xx:xx:xx:xx 
          inet6 addr: xxxx::xxx:xxxx:xxxx:xxxx/64 Scope:Link 
          UP BROADCAST RUNNING NOARP MULTICAST  MTU:1500  Metric:1 
          RX packets:4136 errors:0 dropped:0 overruns:0 frame:0 
          TX packets:3808 errors:0 dropped:0 overruns:0 carrier:0 
          collisions:0 txqueuelen:0 
          RX bytes:388327 (379.2 Kb)  TX bytes:956494 (934.0 Kb)

However with ethereal I see that this interface send a arp-request like
this 
Who has 0.0.0.0? Gratiutous ARP. 

As can I disable these arp request. 
PRE: I'm under XEN SO but eth0 is on dom-0 and MAC of request is eth0
not eth0 on dom-2. kernel 2.6.12.5-r1 and eth0 is
eth0: e1000_probe: Intel(R) PRO/1000 Network Connection

I try different solutions: 
1) With ebtables:
$EBTABLES -P INPUT DROP 
$EBTABLES -P OUTPUT DROP 
$EBTABLES -P FORWARD DROP 
for i in $OTHER_IFACE 
        do 
        echo -n "Enable $i interface..." 
        $EBTABLES -A INPUT -i $i -p arp -j ACCEPT 
        $EBTABLES -A INPUT -i $i -p ipv4 -j ACCEPT 
        $EBTABLES -A OUTPUT -o $i -p arp -j ACCEPT 
        $EBTABLES -A OUTPUT -o $i -p ipv4 -j ACCEPT 
        $EBTABLES -A FORWARD -o $i -p ipv4 -j ACCEPT 
        $EBTABLES -A FORWARD -o $i -p arp -j ACCEPT 
        $EBTABLES -t nat -A POSTROUTING -o $i -p arp -j ACCEPT 
        $EBTABLES -t nat -A POSTROUTING -o $i -p ipv4 -j ACCEPT 
        $EBTABLES -t nat -A OUTPUT -o $i -p arp -j ACCEPT 
        $EBTABLES -t nat -A OUTPUT -o $i -p ipv4 -j ACCEPT 
        $EBTABLES -t nat -A PREROUTING -i $i -p arp -j ACCEPT 
        $EBTABLES -t nat -A PREROUTING -i $i -p ipv4 -j ACCEPT 
        echo "done." 
        done; 

# Rules for adsl clients interface 
$EBTABLES -A INPUT -i eth0 -p ipv4 -j ACCEPT 
$EBTABLES -A OUTPUT -o eth0 -p ipv4 -j ACCEPT 
$EBTABLES -A FORWARD -o eth0 -p ipv4 -j ACCEPT 
$EBTABLES -t nat -A PREROUTING -i eth0 -p ipv4 -j ACCEPT 
$EBTABLES -t nat -A POSTROUTING -o eth0 -p ipv4 -j ACCEPT 
$EBTABLES -t nat -A OUTPUT -o eth0 -p ipv4 -j ACCEPT

Also with these rules there are are request to 0.0.0.0. Also if I have
disabled all packet on eth0!!!!!! 
2) ifconfig eth0 0.0.0.0 -arp 
Nothings. 
3) ip link set eth0 arp off 
Nothings. 

What can I do? 

Thanks for your help.

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