Bad TCP header len question

[rmkml <rmkml () wanadoo fr>]

Hi,

I receive this packet,

but tcpdump not alarm this :

383:
08:40:18.127813 IP (tos 0x0, ttl 105, id 35774, offset 0, flags [none], 
length: 40) 61.153.209.26.80 > 2.3.4.166.16879: S [tcp sum ok] 
3768285676:3768285696(20) ack 3053624288 win 8760

372:
08:40:18.127813 61.153.209.26.80 > 2.3.4.166.16879: S [tcp sum ok] 
3768285676:3768285696(20) ack 3053624288 win 8760 (ttl 105, id 35774, len 
40)

tethereal:
  1 08:40:18.127813 61.153.209.26 -> 2.3.4.166 TCP 80 > 16879 [SYN, 
ACK] Seq=0 Ack=1 Win=8760, bogus TCP header length (0, must be at least 
20)

Possible add detect tcp header len pb in tcpdump ?

Regards

Rmkml () Wanadoo fr

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