[Bug 165059] vtnet(4): Networking breaks with a router using virtio net driver on KVM host

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=165059

--- Comment #28 from elico <ngtech1ltd@gmail.com> ---
(In reply to elico from comment #27)
OK so just to mention the NAT related documents are at:
http://draft.scyphus.co.jp/freebsd/nat.html

and ontop of Oracle Enterprise Linux 8 KVM host the issue exists on 12.3
the setup is very simple:
* Alpine 3.16 with ip 192.168.111.1/24 gw 192.168.111.254 DNS 8.8.8.8
* FreeBSD 12.3 with two interfaces: vtnet0 192.168.110.1/24 GW 192.168.110.254
 vtnet1 192.168.111.254/24
 pf rules to nat on $ext_inf
* VyOS 1.3.2 with two interfaces: eth0 192.168.122.183/24 GW 192.168.122.1
  eth1: 192.168.110.254/24

ping from Alpine to 8.8.8.8 via FreeBSD (NAT) -> VyOS (NAT) = works (ICMP_
wget from Alpine to 8.8.8.8 via FreeBSD (NAT) -> VyOS (NAT) = doesn't work
(TCP)


When I am running the next on the vtnet0 and vtnet1 interfaces the TCP works:
ifconfig vtnet0 -rxcsum
ifconfig vtnet1 -rxcsum

It was resolved long ago in OpenBSD so now there only should be a fix and a
text.

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