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Hi,
 
Well, I added :
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
 
This is the way to go, portable and ready for upgrades ;). Nothing against 
Maurizio by all means, but after years of fighting with the netdev's Julian 
finally convinced the high priest of Linux networking to solve the arp Problem 
once and for eternity. If you read the accompagning documentation on arp_* 
sysctrl you can pretty much figure out that nothing is impossible anymore ;). 
Best regards,
Roberto Nibali, ratz
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