Op 19 apr. 2019, om 14:53 heeft Andrey V. Elsukov <bu7c...@yandex.ru> het volgende geschreven: > > On 19.04.2019 13:46, Marco van Tol wrote: >> There is one exception to this: Host B can ping Host A on any of its >> IPv6 addresses, but it cannot make any tcp connection to any of the >> IPv6 addresses on Host A. Is this expected? > > Hi, > > this looks like the problem with checksum offloading. When such > offloading is enabled on the interface, such protocols like TCP and UDP > defer checksum calculation to interface hardware. ICMPv6 does checksum > calculation in software, thus it usually does not affected by such > problem. Sometimes NIC hardware or driver have bugs and offloading does > not work correctly. You can try to disable checksum offloading on your > interfaces and then try. Also you can use tcpdump to try determine what > the problem you have with TCP.
Ha! Thank you very much, this fixed it. In my case the physical interface used on Host A for transmitting/receiving the vxlan packets was an if_bce interface. After I did the following on host A, Host B could make an IPv6 tcp connection on for example port 443 of host A. ifconfig bce0 -rxcsum Many thanks! -- Marco van Tol _______________________________________________ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
