After router startup, its routingtable shows entries like this: 2a05:bec0:26:2::70 0c:c4:7a:ce:9e:90 UHLc 2a05:bec0:26:2::71 link#1 UHLc
The 2nd one is an alias address for the 1st one (a jail). After ping6 from the router to this 2nd address, it looks as expected: fw1# ping6 2a05:bec0:26:2::71 2a05:bec0:26:2::70 0c:c4:7a:ce:9e:90 UHLc 2a05:bec0:26:2::71 0c:c4:7a:ce:9e:90 UHLc The reason for this misbehaviour was that I disabled auto linklocal (-auto_linklocal in rc.conf). Axel > Am 10.12.2019 um 11:40 schrieb Axel Rau <axel....@chaos1.de>: > > Hi all > > I have a fancy behaviour on a FreeBSD 12.1 box, with > some servers (e.g. rsyslogd, nginx) which happens with > some clients, with others not (both are in the same sub- > nets). Everything is dualstack. Disabling IPv6, stops > the problem. > The traffic is routed via 2 firewalls OpenBSD 6.6) > and a VPN. > > I attach 2 textfiles (tcpdump) with an extracted flow: > > gw1, the OpenBSD side > db3: the FreeBSD side > > I also include an example, where the problem > does not happen: db3,ok.txt > > Which details needs to be collected to insulate > the problem? > > Any help is very welcome, > Axel > > <gw1.32404.txt><db3.32404.txt><db3.ok.txt> > --- > PGP-Key: CDE74120 ☀ computing @ chaos claudius > --- PGP-Key: CDE74120 ☀ computing @ chaos claudius
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