</dl>
<dl>
<dt><code>csum</code></dt>
- <dd>Optional. Compute GRE checksums for outgoing packets and
- require checksums for incoming packets. Note that GRE checksums
+ <dd>Optional. Compute GRE checksums on outgoing packets.
+ Checksums present on incoming packets will be validated
+ regardless of this setting. Note that GRE checksums
impose a significant performance penalty as they cover the
entire packet. As the contents of the packet is typically
covered by L3 and L4 checksums, this additional checksum only