Bad DHCP Checksums over VLANs

[Eric van Gyzen]

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.

Eric