spoof messages

[Jessica Zhu]

Hi,

In our /var/log/messages, there are such messages on two of our servers.

Jun  6 15:08:59 app2 kernel: martian source 0100007f for xxxxxxxx, dev 
eth1
Jun  6 15:08:59 app2 kernel: ll header: ff ff ff ff ff ff 00 02 b3 a3 0d 
c6 08 06 

(Sorry for using x)

Checking the xxxxxxxx, it was the hex number which stands for one 
of our server(not app1) on the site. 

This message appears in the log every 10 minutes. What's going on? And how 
to get rid of the cause of this and thus get rid of the messages.

Jessica