[Bug 276760] vtnet driver incorrectly calculates checksums

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276760

Miroslav Lachman <000.fbsd@quip.cz> changed:

           What    |Removed                     |Added
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                 CC|                            |000.fbsd@quip.cz

--- Comment #3 from Miroslav Lachman <000.fbsd@quip.cz> ---
I think I have related experience with csum vtnet bug. On one VM (in KVM) with
2 vtnet NICs IPsec VPN the packets are not going thru until I disabled csum on
"LAN" NIC vtnet1:

ifconfig_vtnet0="inet AA.BB.CC.DD netmask 255.255.255.128"
ifconfig_vtnet1="inet WW.XX.YY.ZZ/24 -rxcsum -txcsum"

This machine works like an IPsec gateway, vtnet0 is facing the internet, vtnet1
connects private network with clients connecting thru IPsec.
Without -rxcsum -txcsum on vtnet1 the client machines cannot connect to
anything in the outside world.

First discovered with FreeBSD 12.3 (installed in the VM), later upgraded to
13.2.

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