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...he documentation seems to be rather vice versa to what I found out using a 2.4.17 kernel. This is why I''m writing this mail to the list... What I wanted the machine to do was to answer with it''s own MAC address on the external Interface if a certain different IP on the network was ARPrequested. The machine didn''t need to route this address because it was natted. Cited from the howto (chap 13): ---8<---8<---8< /proc/sys/net/ipv4/conf/DEV/proxy_arp If you set this to 1, all other interfaces will respond to arp queries destined for addresses on this interface. Can be ve...