OK, I will give this a try adn downgrade firmware.
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Show posts MenuQuote from: Helge on October 21, 2017, 04:05:00 PMDas gleich Verhalten hatte ich auch bei PFSense. Ändere zum Test mal deinen MTU Wert vom LAN Interface auf den gleichen Wert wie du ihn unter dem WAN Interface eingetragen hast. Normalerweise bleibt dieses Feld frei und damit hat das LAN den Standard MTU Wert von 1500.Oh, nach ganz viel Fehlersuche löste dies mein Multiwan IPV6 Problem.
LAN <----> OPNSense <-----> Internet <------> Proxy BE
|
|<----------> Proxy FR
igb4: <Intel(R) I210 (Fiber)> port 0x8000-0x801f mem 0xdc200000-0xdc2fffff,0xdc300000-0xdc303fff at device 0.0 on pci10
igb4: EEPROM V3.16-0 eTrack 0x800004b4
igb4@pci0:10:0:0: class=0x020000 rev=0x03 hdr=0x00 vendor=0x8086 device=0x1536 subvendor=0xffff subdevice=0x0000
vendor = 'Intel Corporation'
device = 'I210 Gigabit Fiber Network Connection'
class = network
subclass = ethernet
igb4: flags=28943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,PPROMISC> metric 0 mtu 1500
description: WAN_SFP (opt4)
options=4800028<VLAN_MTU,JUMBO_MTU,HWSTATS,MEXTPG>
ether 7c:5a:1c:7d:02:0d
inet 10.10.1.2 netmask 0xffffff00 broadcast 10.10.1.255
inet6 fe80::7e5a:1cff:fe7d:20d%igb4 prefixlen 64 scopeid 0x5
media: Ethernet 1000baseSX <full-duplex> (autoselect)
status: no carrier
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>