<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 TRANSITIONAL//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=UTF-8"> <META NAME="GENERATOR" CONTENT="GtkHTML/4.8.5"> </HEAD> <BODY> On Wed, 2015-04-08 at 14:32 +0200, Martin Kletzander wrote: <BLOCKQUOTE TYPE=CITE> <PRE> I'm guessing the promiscuous modes plays its part in this field. You can try setting the interface to promisc mode manually using 'ip l set $dev promisc on' and see whether that helps without starting tcpdump. Also check sysctl -a | grep 'ipv6.*forward'. </PRE> </BLOCKQUOTE> Thank you for your answer. IIRC forwarding is only required for routing. I use bridge mode. You are right - it's working with promiscious mode enabled. Without: 2a01:198:200:8350:98ec:1708:c82e:a4fb dev br-lan INCOMPLETE With: 2a01:198:200:8350:98ec:1708:c82e:a4fb dev br-lan lladdr 52:54:00:8e:b9:eb REACHABLE Is it really required to be enabled all the time to make it work? Cheers, Stefan </BODY> </HTML>