#define s_host S_un.S_un_b.s_b2 /* host on imp */
#define s_net S_un.S_un_b.s_b1 /* network */
#define s_imp S_un.S_un_w.s_w2 /* imp */
#define s_impno S_un.S_un_b.s_b4 /* imp # */
#define s_lh S_un.S_un_b.s_b3 /* logical host */
#define s_host S_un.S_un_b.s_b2 /* host on imp */
#define s_net S_un.S_un_b.s_b1 /* network */
#define s_imp S_un.S_un_w.s_w2 /* imp */
#define s_impno S_un.S_un_b.s_b4 /* imp # */
#define s_lh S_un.S_un_b.s_b3 /* logical host */