Bad DHCP Checksums over VLANs

[Kristof Provost]

On 16 Sep 2018, at 23:05, Eric van Gyzen wrote:
> On 9/15/18 1:06 AM, Kurt Jaeger wrote:
>> Can you disable all the options of the NIC ?
>>
>> ifconfig igb0 -rxcsum -txcsum -wol -tso4 -vlanmtu -vlanhwtag 
>> -vlanhwcsum -vlanhwtso
>>
>> Try to disable everything that can be disabled, e.g. LRO etc.
>
> Disabling vlanhwtag works around the problem.
>
> Also note that only DHCP traffic has this problem.  If I assign an 
> address manually, all traffic flows normally.  Maybe the problem is in 
> the BPF send path.
>
I had a similar issue, where -vlanhwtag also fixed it.
That was on a I210 (gib) card (in a FreeNAS mini XL).

Regards,
Kristof