Denton22

@Monviech I am unsure,I am just a Network Engineer and no developer. However to me it looks like, that OpenSense or FreeBSD is not conform to the IPv6 Specifications mentioned...

@Monviech Ok, so changing the WAN MTU to 1400 has the effect, that the ping "ping ds.frankfurt.test-ipv6.com -l 2000" is working relliably, the first reply is lost downstream but that...

Ok so my final remark for this topic for today. I have now tested how the AVM Fritzbox 7590 does it (My ISP Router). I have connected my PC to...

@AdSchellevis Disabling FW Normalization like you mentioned, changes nothing in the IPv6 flow: ISP Router LAN MTU= 1500 ISP Router WAN MTU = 1492 Opensene WAN MTU = 1500 -->...

> For ipv4 I'm quite sure it works as designed, for ipv6 we might be chasing ghosts here, although I'm not sure. If you want to exclude the firewall in...

@AdSchellevis i can confirm that the issue is not happening when i disable the firewall with pfctl -d I have also set the MTU on WAN to 1500 again Without...

Well i added an ipv4+ipv6 rule with any on both LAN and WAN, but it didnt changed the outcome.

> just to be sure, I mean a pf.conf file with only `pass all` in it to exclude any defaults from our end (loaded via `pfctl -f /path/to/my/file`) Sure can...

@Monviech do you have a file to test with? Because if I create a simple file "test.xml" with "pass all" i just get a syntax error I tried some different...

On a different note, does opensense implement ipfw? Because quite some time ago, there was this report https://reviews.freebsd.org/D10533 and the linked bugreport https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=170604 reads alot like the problem i am...