PPP_MAXMTU
PPP_MAXMTU, PPP_MINMTU },
int absmax_mtu = PPP_MAXMTU;
if ((mtu <= 0) || (mtu > PPP_MAXMTU)) {
ppa->ppa_mtu = PPP_MAXMTU; /* 65535-(PPP_HDRLEN+PPP_FCSLEN) */
PPP_MAXMTU, /* dl_max_sdu */
dlip->dl_max_sdu = ppa != NULL ? ppa->ppa_mtu : PPP_MAXMTU;
PPP_MAXMTU, /* mi_maxpsz */
#define TUN_MI_MAXPSZ (PPP_MAXMTU)