don't print packet with short iphlen. from: tcpdump.org (bugtraq 99 june)
don't print packet with short iphlen.
from: tcpdump.org (bugtraq 99 june)

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame