Tiap-tiap struktur data rtable menangani informasi tentang jalur yang dipakai dalam rangka mengirimkan paket ke host IP. Struktur data rtable digunakan didalam cache route IP.

struct rtable
{
    struct rtable     *rt_next;
    __u32             rt_dst;
    __u32             rt_src;
    __u32             rt_gateway;
    atomic_t          rt_refcnt;
    atomic_t          rt_use;
    unsigned long     rt_window;
    atomic_t          rt_lastuse;
    struct hh_cache   *rt_hh;
    struct device     *rt_dev;
    unsigned short    rt_flags;
    unsigned short    rt_mtu;
    unsigned short    rt_irtt;
    unsigned char     rt_tos;
};

Sumber : tldp.org