unicast vxlan - unable to tcp connect to ipv6 ip's on endpoint host

[Andrey V. Elsukov]

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.

-- 
WBR, Andrey V. Elsukov

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 554 bytes
Desc: OpenPGP digital signature
URL: <http://lists.freebsd.org/pipermail/freebsd-net/attachments/20190419/799a8815/attachment.sig>