ETH_MAX_MTU
#define MAX_RFC1533_VENDLEN (ETH_MAX_MTU - sizeof(struct bootpip_t) + BOOTP_VENDOR_LEN)
#ifndef ETH_MAX_MTU
ETH_MAX_MTU / 256, ETH_MAX_MTU % 256,
ETH_MAX_MTU / 256, ETH_MAX_MTU % 256,
if (ntohs(ip->len) > ETH_MAX_MTU)
MAC_RX_MTU_SIZE, ETH_MAX_MTU + ETH_HLEN + 8,