#define IF_TAP 1
#define IF_TUN 2

#define ETHERNET_MIN_FRAME_SIZE 14
#define TUN_MIN_FRAME_SIZE 5

#define MTU_MIN 74
#define MTU_MAX 1522
#define MTU_DEFAULT 329

#define TXQUEUELEN 10

// ARP timings, in seconds
#define ARP_BASE_REACHABLE_TIME 300
#define ARP_RETRANS_TIME 5