ibuf_set_n32
int ibuf_set_n32(struct ibuf *, size_t, uint64_t);
if (ibuf_set_n32(buf, offsetof(struct eigrp_hdr, ack_num),
if (ibuf_set_n32(buf, offsetof(struct eigrp_hdr, flags),
if (ibuf_set_n32(buf, sizeof(struct ospf_hdr), nlsa) == -1)
if (ibuf_set_n32(buf, sizeof(struct ospf_hdr), nlsa) == -1)