tcpdump mailing list archives
Re: IP Header Size is always 5
From: Sebastien Roy <Sebastien.Roy () Sun COM>
Date: Wed, 01 Apr 2009 11:22:55 -0400
On Wed, 2009-04-01 at 20:42 +0530, Shameem Ahamed wrote:
I was trying to create a function (for testing purpose) which displays the header information for Ethernet, IP and TCP using a Linux machine. The problem i am having is, whenever i read any packet from the saved pcap file, it displays the IP header size (ip->ip_hl) is 5 (some times less than 5).
The header length field in an IPv4 header is the length of the header in 32-bit words (not in bytes). See RFC 791. -Seb - This is the tcpdump-workers list. Visit https://cod.sandelman.ca/ to unsubscribe.
Current thread:
- IP Header Size is always 5 Shameem Ahamed (Apr 01)
- Re: IP Header Size is always 5 Sebastien Roy (Apr 01)
- Re: IP Header Size is always 5 Shameem Ahamed (Apr 01)
- Re: IP Header Size is always 5 Guy Harris (Apr 01)
- Re: IP Header Size is always 5 Shameem Ahamed (Apr 01)
- Re: IP Header Size is always 5 Shameem Ahamed (Apr 01)
- Re: IP Header Size is always 5 Sebastien Roy (Apr 01)
- Re: IP Header Size is always 5 Florian Weimer (Apr 01)