Is length of ethernet header necessarily 14?

Posted by httpinterpret on Stack Overflow See other posts from Stack Overflow or by httpinterpret
Published on 2010-05-09T07:29:53Z Indexed on 2010/05/09 7:38 UTC
Read the original article Hit count: 138

Filed under:

c

|

ethernet

Code snippet from here:

/* retireve the position of the ip header */
ih = (ip_header *) (pkt_data +
    14); //length of ethernet header

But this image doesn't say it's necessarily 14:

alt text

How should I do it properly?

Related posts about ethernet

check if my ethernet controller supports gigabit Ethernet

as seen on Super User - Search for 'Super User'
is there a command that i can issue in ubuntu to see explicitly if my ethernet controller supports gigabit ethernet? >>> More
MySQL performance - 100Mb ethernet vs 1Gb ethernet

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi All I've just started a new job and noticed that the analysts computers are connected to the network at 100Mbps. The ODBC queries we run against the MySQL server can easily return 500MB+ and it seems at times when the servers are under high load the DBAs kill low priority jobs as they are taking… >>> More
MySQL query performance - 100Mb ethernet vs 1Gb ethernet

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi All I've just started a new job and noticed that the analysts computers are connected to the network at 100Mbps. The queries we run against the MySQL server can easily be 500MB+ and it seems at times when the servers are under high load the DBAs kill low priority jobs as they are taking too long… >>> More
Bridging with aliased Ethernet card for Virtualizing with single Ethernet card

as seen on Server Fault - Search for 'Server Fault'
We are having a server with good CPU and RAM,so we are planning to do XEN virtualization on ubuntu 12.04 server to handle high traffic. The plan is to keep the host machine only to manage VMs(no NAT ing). A New public IP will be assigned to that VM,For that i think we need a Bridge to external network(Since… >>> More
broadcom 5722 NIC not installed on Ubuntu Server, although driver present

as seen on Server Fault - Search for 'Server Fault'
Hello, I just installed Ubuntu Server 10.04 LTS, running kernel 2.6.32-24-server, on a brand new Dell T110 server, supposedly fully compatible with Ubuntu Server. I have two NICs: one ONBOARD, the other additional on PCI. both of them are Broadcom netXtreme 5572. on the first boot of the system… >>> More

Developer IT

Is length of ethernet header necessarily 14? - Developer IT

Is length of ethernet header necessarily 14?

c

ethernet

Related posts about c

Related posts about ethernet

check if my ethernet controller supports gigabit Ethernet

MySQL performance - 100Mb ethernet vs 1Gb ethernet

MySQL query performance - 100Mb ethernet vs 1Gb ethernet

Bridging with aliased Ethernet card for Virtualizing with single Ethernet card

broadcom 5722 NIC not installed on Ubuntu Server, although driver present

Categories cloud