Unable to disable tx-checksum-ip-generic

[MRATT]

I have several VMware ESXi VMs with Ubuntu Server 20.04 and Docker which need to have "tx-checksum-ip-generic" disabled, otherwise Docker Swarm nodes cannot communicate properly. This has to be done manually following every reboot and often folks forget and then we start to have outages.

There is no way to set this permanently in netplan.io even in 0.104-0ubuntu2~20.04.1 it seems.

I have tried setting this in the YML in the hope it covers "tx-checksum-ip-generic" as well:
  ethernets:
    ens160:
      dhcp4: no
      ...
      transmit-checksum-offload: false

however the results of ethtool after a "netplan apply" or a reboot are exactly the same:
> ethtool --show-offload ens160 | grep tx
tx-checksumming: off
        tx-checksum-ipv4: off [fixed]
        tx-checksum-ip-generic: on
        tx-checksum-ipv6: off [fixed]
        tx-checksum-fcoe-crc: off [fixed]
        tx-checksum-sctp: off [fixed]
        tx-scatter-gather: on
        tx-scatter-gather-fraglist: off [fixed]
        tx-tcp-segmentation: off [requested on]
        tx-tcp-ecn-segmentation: off [fixed]
        tx-tcp-mangleid-segmentation: off
        tx-tcp6-segmentation: off [requested on]
tx-vlan-offload: on
tx-lockless: off [fixed]
tx-gso-robust: off [fixed]
tx-fcoe-segmentation: off [fixed]
tx-gre-segmentation: off [fixed]
tx-gre-csum-segmentation: off [fixed]
tx-ipxip4-segmentation: off [fixed]
tx-ipxip6-segmentation: off [fixed]
tx-udp_tnl-segmentation: on
tx-udp_tnl-csum-segmentation: on
tx-gso-partial: off [fixed]
tx-tunnel-remcsum-segmentation: off [fixed]
tx-sctp-segmentation: off [fixed]
tx-esp-segmentation: off [fixed]
tx-udp-segmentation: off [fixed]
tx-gso-list: off [fixed]
tx-nocache-copy: off
tx-vlan-stag-hw-insert: off [fixed]
esp-tx-csum-hw-offload: off [fixed]
tls-hw-tx-offload: off [fixed]

[Lukas Märdian (slyon)]

This was fixed upstream and is pending stable release update into Focal.

Once the SRU is deployed, this should work using the "transmit-checksum-offload: false" setting.

https://github.com/canonical/netplan/pull/270
https://bugs.launchpad.net/netplan/+bug/1956264

Marking as duplicate.

[Hugo Lopez (hugoelopezp)]

Did you manage to get this working? I'm on the exact same boat, Ubuntu 20.04.4 and netplan.io 0.104-0ubuntu2.

Inserting this line doesn't seem to have any effect:

      transmit-checksum-offload: false

[Roger (infroger)]

I resolved it in 22.04 using this reference: https://michael.mulqueen.me.uk/2018/08/disable-offloading-netplan-ubuntu/

In my case:

$ cat /usr/lib/networkd-dispatcher/routable.d/10-disable-offloading
#!/bin/bash
ethtool -K ens192 tx-checksum-ip-generic off

And the behaviour is as expected after a reboot.

$ sudo ethtool --show-offload ens192 |grep tx-checksum-ip-generic
 tx-checksum-ip-generic: off