how to enable RXCSUM,TXCSUM options?

[Mipam]

Hi,

Doing ifconfig bge0 i saw:

options=1b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING>

When i do ifconfig bge0 -txcsum i saw:

options=18<VLAN_MTU,VLAN_HWTAGGING>

So it means txcsum and rxcsum are enabled by default, so checksum
offloading is enabled by default?
However, whether i configure bge0 with or without txcsum, bad udp and tcp
checksums are seen by tcpdump anyway ... is that normal?
Bye,

Mipam.