diff --git a/conf/cf-lex.l b/conf/cf-lex.l
index 99785057..35b590bb 100644
--- a/conf/cf-lex.l
+++ b/conf/cf-lex.l
@@ -646,7 +646,7 @@ cf_walk_symbols(struct config *cf, struct symbol *sym, int *pos)
 char *
 cf_symbol_class_name(struct symbol *sym)
 {
-  if ((sym->class & 0xff00) == SYM_CONSTANT)
+  if (cf_symbol_is_constant(sym))
     return "constant";
 
   switch (sym->class)
diff --git a/conf/conf.h b/conf/conf.h
index fa14d7b5..799873d2 100644
--- a/conf/conf.h
+++ b/conf/conf.h
@@ -149,6 +149,10 @@ void cf_pop_scope(void);
 struct symbol *cf_walk_symbols(struct config *cf, struct symbol *sym, int *pos);
 char *cf_symbol_class_name(struct symbol *sym);
 
+static inline int cf_symbol_is_constant(struct symbol *sym)
+{ return (sym->class & 0xff00) == SYM_CONSTANT; }
+
+
 /* Parser */
 
 int cf_parse(void);
diff --git a/filter/config.Y b/filter/config.Y
index 04acfbab..e50e75ca 100644
--- a/filter/config.Y
+++ b/filter/config.Y
@@ -25,6 +25,23 @@ static inline u32 pair_b(u32 p) { return p & 0xFFFF; }
  * to the last item in a list (right ptr). For convenience, even items
  * are handled as one-item lists. Lists are merged by f_merge_items().
  */
+static int
+f_valid_set_type(int type)
+{
+  switch (type)
+  {
+  case T_INT:
+  case T_PAIR:
+  case T_QUAD:
+  case T_ENUM:
+  case T_IP:
+  case T_EC:
+    return 1;
+
+  default:
+    return 0;
+  }
+}
 
 static inline struct f_tree *
 f_new_item(struct f_val from, struct f_val to)
@@ -473,10 +490,19 @@ fipa:
  */
 
 set_atom:
-   expr  { $$.type = T_INT; $$.val.i = $1; }
+   NUM   { $$.type = T_INT; $$.val.i = $1; }
  | RTRID { $$.type = T_QUAD; $$.val.i = $1; }
  | fipa  { $$ = $1; }
  | ENUM  { $$.type = pair_a($1); $$.val.i = pair_b($1); }
+ | '(' term ')' {
+     $$ = f_eval($2, cfg_mem);
+     if (!f_valid_set_type($$.type)) cf_error("Set-incompatible type");
+   }
+ | SYM {
+     if (!cf_symbol_is_constant($1)) cf_error("%s: constant expected", $1->name);
+     if (!f_valid_set_type(SYM_TYPE($1))) cf_error("%s: set-incompatible type", $1->name);
+     $$ = *(struct f_val *)($1->def);
+   }
  ;
 
 switch_atom:
diff --git a/filter/test.conf b/filter/test.conf
index 84faca0e..a99d0a51 100644
--- a/filter/test.conf
+++ b/filter/test.conf
@@ -13,6 +13,9 @@ define '1a-a1' = (20+10);
 define one = 1;
 define ten = 10;
 
+define p23 = (2, 3);
+define ip1222 = 1.2.2.2;
+
 function onef(int a)
 {
 	return 1;
@@ -98,7 +101,7 @@ eclist el2;
 	print "Should be true: ", p2 ~ pm1, " ", p2 ~ pm2, " ", 3 ~ p2, " ", p2 ~ [2, 10..20], " ", p2 ~ [4, 10..20];
 	print "4 = ", p2.len;
 	p2 = prepend( p2, 5 );
-	print "Should be false: ", p2 ~ pm1, " ", p2 ~ pm2, " ", 10 ~ p2, " ", p2 ~ [8, 10..20],;
+	print "Should be false: ", p2 ~ pm1, " ", p2 ~ pm2, " ", 10 ~ p2, " ", p2 ~ [8, ten..(2*ten)];
 	print "Should be true: ", p2 ~  / ? 4 3 2 1 /,  " ", p2, " ",  / ? 4 3 2 1 /;
 	print "Should be true: ", p2 ~ [= * 4 3 * 1 =], " ", p2, " ", [= * 4 3 * 1 =];
 	print "Should be true: ", p2 ~ [= (3+2) (2*2) 3 2 1 =], " ", p2 ~ mkpath(5, 4);
@@ -124,7 +127,7 @@ eclist el2;
 	print "Should be always true: ", l ~ [(*,*)];
 	l = add( l, (2,one+2) );
 	print "Community list (1,2) (2,3) ", l;
-	print "Should be true: ", (2,3) ~ l, " ", l ~ [(1,*)], " ", l ~ [(2,3)]," ", l ~ [(2,2..3)], " ", l ~ [(1,1..2)], " ", l ~ [(1,1)..(1,2)];
+	print "Should be true: ", (2,3) ~ l, " ", l ~ [(1,*)], " ", l ~ [p23]," ", l ~ [(2,2..3)], " ", l ~ [(1,1..2)], " ", l ~ [(1,1)..(1,2)];
 	l = add( l, (2,5) );
 	l = add( l, (5,one) );
 	l = add( l, (6,one) );
@@ -361,7 +364,7 @@ string st;
         if ( b = true ) then print "Testing bool comparison b = true: ", b;
 	else { print "*** FAIL: TRUE test failed" ; quitbird; }
 	
-	ips = [ 1.1.1.0 .. 1.1.1.255, 1.2.2.2];
+	ips = [ 1.1.1.0 .. 1.1.1.255, ip1222];
 	print "Testing IP sets: ";
 	print ips;
 	print "  must be true:  ",	1.1.1.0 ~ ips, ",", 1.1.1.100 ~ ips, ",", 1.2.2.2 ~ ips;