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
signature.asc
Description: OpenPGP digital signature
