[vbox-dev] Odd networking issue with VirtuaBox

Maarten Hoes hoes.maarten at gmail.com
Tue Jun 16 17:13:27 GMT 2015


On Tue, Jun 16, 2015 at 7:04 PM, Aleksey Ilyushin <
aleksey.ilyushin at oracle.com> wrote:

> On 16 Jun 2015, at 19:53, Maarten Hoes <hoes.maarten at gmail.com> wrote:
> Hi,
> On Tue, Jun 16, 2015 at 6:07 PM, Aleksey Ilyushin <
> aleksey.ilyushin at oracle.com> wrote:
>> Please start by disabling both checksum and segmentation offloading in
>> the guest (‘ethtool -K’ is the way to go).
> ethtool -K enp0s3 gives me the message: 'no features changed'. It also
> does not change the behavior.
> Well… do 'ethtool -k enp0s3’ first. This will give you the list of
> offloading features. Some of them will be turned on. Try turning them off
> one by one with ‘ethtool -K’. Start with TCP segmentation offloading, then
> try TCP checksums. For example, to turn off TCP segmentation offloading do
> 'ethtool -K enp0s3 tso off’ (if I remember correctly).

All of it seems to be already disabled/off for my vm:

# ethtool -k enp0s3 | grep -i off
rx-checksumming: off
        tx-checksum-ipv4: off [fixed]
        tx-checksum-ipv6: off [fixed]
        tx-checksum-fcoe-crc: off [fixed]
        tx-checksum-sctp: off [fixed]
        tx-scatter-gather-fraglist: off [fixed]
tcp-segmentation-offload: off
        tx-tcp-segmentation: off [fixed]
        tx-tcp-ecn-segmentation: off [fixed]
        tx-tcp6-segmentation: off [fixed]
udp-fragmentation-offload: off [fixed]
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off [fixed]
rx-vlan-offload: on
tx-vlan-offload: on [fixed]
ntuple-filters: off [fixed]
receive-hashing: off [fixed]
highdma: off [fixed]
vlan-challenged: off [fixed]
tx-lockless: off [fixed]
netns-local: off [fixed]
tx-gso-robust: off [fixed]
tx-fcoe-segmentation: off [fixed]
tx-gre-segmentation: off [fixed]
tx-ipip-segmentation: off [fixed]
tx-sit-segmentation: off [fixed]
tx-udp_tnl-segmentation: off [fixed]
tx-mpls-segmentation: off [fixed]
fcoe-mtu: off [fixed]
loopback: off [fixed]
rx-fcs: off
rx-all: off
tx-vlan-stag-hw-insert: off [fixed]
rx-vlan-stag-hw-parse: off [fixed]
rx-vlan-stag-filter: off [fixed]
busy-poll: off [fixed]

And specifically trying to set tcp segment offloading to off anyway
(although that already seems to be the case), just results in an error:

# ethtool -K enp0s3 tso off
Cannot change tcp-segmentation-offload

- Maarten
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