Glossary: TCP/IP in Depth, Part 1
FCS (frame check sequence)
A 4-byte check value at the end of every Ethernet frame. The receiving card recomputes it to drop damaged frames, then removes it, so tcpdump never shows it.
Glossary: TCP/IP in Depth, Part 1
A 4-byte check value at the end of every Ethernet frame. The receiving card recomputes it to drop damaged frames, then removes it, so tcpdump never shows it.