Comment 1 for bug 1780060

Issue is present on master also

No Tc on interfaces:

[cloud@devstack:~] 39s $ sudo vif --list
Vrouter Interface Table

Flags: P=Policy, X=Cross Connect, S=Service Chain, Mr=Receive Mirror
       Mt=Transmit Mirror, Tc=Transmit Checksum Offload, L3=Layer 3, L2=Layer 2
       D=DHCP, Vp=Vhost Physical, Pr=Promiscuous, Vnt=Native Vlan Tagged
       Mnp=No MAC Proxy, Dpdk=DPDK PMD Interface, Rfl=Receive Filtering Offload, Mon=Interface is Monitored
       Uuf=Unknown Unicast Flood, Vof=VLAN insert/strip offload, Df=Drop New Flows, L=MAC Learning Enabled
       Proxy=MAC Requests Proxied Always, Er=Etree Root, Mn=Mirror without Vlan Tag, Ig=Igmp Trap Enabled

vif0/0 OS: ens3
            Type:Physical HWaddr:02:17:78:da:90:6c IPaddr:0.0.0.0
            Vrf:0 Mcast Vrf:65535 Flags:L3L2VpEr QOS:-1 Ref:3
            RX packets:11900 bytes:4736349 errors:0
            TX packets:13496 bytes:5594197 errors:0
            Drops:0

vif0/1 OS: vhost0
            Type:Host HWaddr:02:17:78:da:90:6c IPaddr:192.168.40.11
            Vrf:0 Mcast Vrf:65535 Flags:L3DEr QOS:-1 Ref:8
            RX packets:13633 bytes:5610074 errors:0
            TX packets:12465 bytes:4769656 errors:0
            Drops:0

vif0/2 OS: pkt0
            Type:Agent HWaddr:00:00:5e:00:01:00 IPaddr:0.0.0.0
            Vrf:65535 Mcast Vrf:65535 Flags:L3Er QOS:-1 Ref:3
            RX packets:2439 bytes:223920 errors:4
            TX packets:1729 bytes:157545 errors:0
            Drops:8

vif0/6 OS: tap7b38c53a-7c
            Type:Virtual HWaddr:00:00:5e:00:01:00 IPaddr:10.24.0.4
            Vrf:4 Mcast Vrf:4 Flags:PL3L2DEr QOS:-1 Ref:6
            RX packets:2583 bytes:346981 errors:0
            TX packets:5795 bytes:4184638 errors:0
            ISID: 0 Bmac: 02:7b:38:c5:3a:7c
            Drops:15

No cksum from the VM, bad after the NAT

[cloud@devstack:~] $ sudo tcpdump -vv -i any -n port 4500
13:44:42.423143 IP (tos 0x0, ttl 64, id 32615, offset 0, flags [DF], proto UDP (17), length 160)
    10.24.0.4.4500 > 90.84.46.223.1024: [no cksum] UDP-encap: ESP(spi=0xc863117d,seq=0xef), length 132
13:44:42.423143 IP (tos 0x0, ttl 63, id 32615, offset 0, flags [DF], proto UDP (17), length 160)
    172.24.4.8.4500 > 90.84.46.223.1024: [bad udp cksum 0x59fb -> 0x1a5f!] UDP-encap: ESP(spi=0xc863117d,seq=0xef), length 132