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header checksum (HCS)

In the IP header, the HeaderChecksum (HCS) is a 16-bit long data field that contains the checksum from the data of the IP header and any option field used; but without the payload

. This data from the HCS field is used to check the IP header

for errors. When IP datagrams are fragmented

, the checksum of the header changes, as does when the TTL time is decremented. The checksummust then be recalculated.

IP data packets with errors are simply discarded and requested again by the sending data station.

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Englisch: header checksum - HCS
Updated at: 27.12.2010
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Translations: DE