ph_cookie
ni = m->m_pkthdr.ph_cookie;
ni = m->m_pkthdr.ph_cookie;
ni = m->m_pkthdr.ph_cookie;
if (m->m_pkthdr.ph_cookie == ni) {
m->m_pkthdr.ph_cookie = ni;
m->m_pkthdr.ph_cookie = ni;
m->m_pkthdr.ph_cookie = ni;
m->m_pkthdr.ph_cookie = ni;