Nikolaos, : I have read the section : http://lartc.org/howto/lartc.bridging.proxy-arp.html . I configured my : two ethernet devices with the same ip address . Should i configure them : with a specific command ? : : I used : ifconfig eth0 192.168.47.104 netmask 255.255.255.0 : ifconfig eth1 192.168.47.104 netmask 255.255.255.0 : : I tried to configure them with ip also . You don't need to use the same IP on both interfaces, but I don't see a problem if you do so. <snip/> : I checked for support in kernel : # dmesg |grep ip_ : ip_conntrack version 2.1 (4095 buckets, 32760 max) - 292 bytes per conntrack : ip_tables: (C) 2000-2002 Netfilter core team : Is there any specific kernel option for proxy-arp ? OK, so there's not much here, but you may find the tidbit you seek here: http://linux-ip.net/html/ether-arp.html#ether-arp-proxy See also Julian's remarks (this includes comments on medium_id, which you don't need), which should give you a good idea of how to perform proxy ARP with the kernel. http://www.ssi.bg/~julian/#medium_id Or, if you don't want the kernel to perform proxy ARP, you can use this technique, which employs /sbin/arp directly to add proxy ARP entries: http://linux-ip.net/html/adv-proxy-arp.html The benefit of manual proxy ARP entries is a very fine-grained control over which machines are visible to each side of your proxy ARP'ing router. : then i tried to enable proxy arp with : : echo 1 > /proc/sys/net/ipv4/conf/eth0/proxy_arp : echo 1 > /proc/sys/net/ipv4/conf/eth1/proxy_arp : but proxy_arp remains 0 , whatever i do . This is exactly what you wish to do, but you forgot one other sysctl: echo 1 > /proc/sys/net/ipv4/conf/all/proxy_arp See Oskar Andreasson's sysctl tutorial for some more details on how to use the net/ipv4/conf sysctl variables. http://ipsysctl-tutorial.frozentux.net/ Best of luck, -Martin -- Martin A. Brown --- SecurePipe, Inc. --- mabrown@xxxxxxxxxxxxxx
