Brocade Virtual ADX Installation and Deployment Guide (Supporting ADX v03.1.00) - Manual (Page 56)

Incoming packets
Brocade Virtual ADX uses e1000 vNICs on the XenServer platform. e1000 vNICs do not support
incoming checksum vierification. The Brocade Virtual ADX software performs TCP checksum
verification on incoming packets.
Outgoing packets
By default, TCP checksum offload is disabled and checksum calculation is performed by the Brocade
Virtual ADX software.
Enabling or disabling TCP checksum offload
Ensure that your network adaptor supports checksum offload prior to enabling TCP checksum offload.
1. Enter the configure command to access global configuration mode.
Virtual ADX# configure terminal
2. Use the following command to enable TCP checksum offload.
Virtual ADX(config)# server hw-csum-offload
Incoming packets
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