diff --git a/filter/test.conf b/filter/test.conf
index 40e7e838..078dafb9 100644
--- a/filter/test.conf
+++ b/filter/test.conf
@@ -319,6 +319,9 @@ ip p;
 
 	p = ::fffe:6:c0c:936d:88c7:35d3;
 	bt_assert(format(p) = "::fffe:6:c0c:936d:88c7:35d3");
+
+	p = 1234:5678::;
+	bt_assert(p.mask(24) = 1234:5600::);
 }
 
 bt_test_suite(t_ip, "Testing ip address");
@@ -466,6 +469,85 @@ bt_test_suite(t_prefix_set, "Testing prefix sets");
 
 
 
+/*
+ * 	Testing Prefix IPv6
+ * 	-------------------
+ */
+
+function t_prefix6()
+prefix px;
+{
+	px = 1020::/18;
+	bt_assert(format(px) = "1020::/18");
+	bt_assert(1020:3040:5060:: ~ 1020:3040:5000::/40);
+	bt_assert(1020:3040::/32 ~ 1020:3040::/32);
+	bt_assert(1020:3040::/33 ~ 1020:3040::/32);
+	bt_assert(1020:3040:5060::/48 ~ 1020:3040::/32);
+	bt_assert(1020:3040::/31 !~ 1020:3040::/32);
+	bt_assert(1020:3041::/33 !~ 1020:3040::/32);
+}
+
+bt_test_suite(t_prefix6, "Testing prefix IPv6");
+
+
+
+
+/*
+ *	Testing prefix IPv6 sets
+ *	------------------------
+ */
+
+function t_prefix6_set()
+prefix set pxs;
+{
+	bt_assert(1180::/16 ~ [ 1100::/8{15, 17} ]);
+	bt_assert(12::34 = 12::34);
+	bt_assert(12::34 ~ [ 12::33..12::35 ]);
+	bt_assert(1020::34 ~ 1000::/8);
+	bt_assert(1000::/8 ~ 1000::/8);
+	bt_assert(1000::/8 ~ [ 1000::/8+ ]);
+	bt_assert(12::34 !~ [ 12::33, 12::35 ]);
+	bt_assert(1000::/9 !~ [ 1000::/8- ]);
+	bt_assert(1000::/17 !~ [ 1000::/8{15, 16} ]);
+
+	pxs = [ 1102::/16, 1104::/16+];
+	bt_assert(1102::/16  ~ pxs);
+	bt_assert(1104::/16  ~ pxs);
+	bt_assert(1104::/18  ~ pxs);
+	bt_assert(1104::/32  ~ pxs);
+	bt_assert(1101::/16 !~ pxs);
+	bt_assert(1103::/16 !~ pxs);
+	bt_assert(1102::/15 !~ pxs);
+	bt_assert(1102::/17 !~ pxs);
+	bt_assert(1102::/32 !~ pxs);
+	bt_assert(1104::/15 !~ pxs);
+
+	pxs = ([ 1000::/16{8,12}, 2000::/16{24,28} ]);
+	bt_assert(format(pxs) = "[1000::/12{1f0::}, 2000::/16{0:1f0::}]");
+	bt_assert(1000::/8  ~ pxs);
+	bt_assert(1000::/10 ~ pxs);
+	bt_assert(1000::/12 ~ pxs);
+	bt_assert(2000::/24 ~ pxs);
+	bt_assert(2000:4000::/24 ~ pxs);
+	bt_assert(2000::/26 ~ pxs);
+	bt_assert(2000:8000::/26 ~ pxs);
+	bt_assert(2000::/28 ~ pxs);
+	bt_assert(2000:FFF0::/28 ~ pxs);
+	bt_assert(1000::/7  !~ pxs);
+	bt_assert(1000::/13 !~ pxs);
+	bt_assert(1000::/16 !~ pxs);
+	bt_assert(2000::/16 !~ pxs);
+	bt_assert(2000::/23 !~ pxs);
+	bt_assert(2000::/29 !~ pxs);
+	bt_assert(1100::/10 !~ pxs);
+	bt_assert(2010::/26 !~ pxs);
+}
+
+bt_test_suite(t_prefix6_set, "Testing prefix IPv6 sets");
+
+
+
+
 /*
  * 	Testing Paths
  * 	-------------
diff --git a/filter/test6.conf b/filter/test6.conf
deleted file mode 100644
index fb82cf6b..00000000
--- a/filter/test6.conf
+++ /dev/null
@@ -1,185 +0,0 @@
-/*
- *	This is an example configuration file.
- *	FIXME: add all examples from docs here.
- */
-
-# Yet another comment
-
-router id 62.168.0.1;
-
-define xyzzy = (120+10);
-
-protocol device {}
-
-function callme(int arg1; int arg2)
-int local1;
-int local2;
-int i;
-{
-	printn "Function callme called arguments ", arg1, " and ", arg2, ":" ;
-	i = arg2;
-
-	case arg1 {
-	2: print "dva"; print "jeste jednou dva";
-	3 .. 5: print "tri az pet";
-	else: print "neco jineho";
-	}	
-}
-
-function fifteen()
-{
-	print "fifteen called";
-	return 15;
-}
-
-function _paths()
-bgpmask pm1;
-bgpmask pm2;
-bgppath p2;
-clist l;
-{
-	pm1 =  / 4 3 2 1 /;
-	pm2 = [= 4 3 2 1 =];
-	print "Testing path masks: ", pm1, " ", pm2;
-	p2 = prepend( + empty +, 1 );
-	p2 = prepend( p2, 2 );
-	p2 = prepend( p2, 3 );
-	p2 = prepend( p2, 4 );
-	print "Testing paths: ", p2;
-	print "Should be true: ", p2 ~ pm1, " ", p2 ~ pm2;
-	print "4 = ", p2.len;
-	p2 = prepend( p2, 5 );
-	print "Should be false: ", p2 ~ pm1, " ", p2 ~ pm2;
-	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 "5 = ", p2.len;
-	
-	pm1 = [= 1 2 * 3 4 5 =];
-	p2 = prepend( + empty +, 5 );
-	p2 = prepend( p2, 4 );
-	p2 = prepend( p2, 3 );
-	p2 = prepend( p2, 3 );
-	p2 = prepend( p2, 2 );
-	p2 = prepend( p2, 1 );
-	print "Should be true: ", p2 ~ pm1, " ", p2, " ", pm1;
-
-	l = - empty -;
-	l = add( l, (1,2) );
-	l = add( l, (2,3) );
-	print "Community list (1,2) (2,3) ", l;
-	print "Should be true: ", (2,3) ~ l;
-	l = delete( l, (2,3) );
-	print "Community list (1,2) ", l;
-	print "Should be false: ", (2,3) ~ l;
-}
-
-function bla()
-{
-	print "fifteen called";
-	return 15;
-}
-
-define four=4;
-
-function test_pxset(prefix set pxs)
-{
-	print "  must be true:  ",	1000::/8  ~ pxs, ",", 1000::/10  ~ pxs, ",", 1000::/12 ~ pxs, ",",
-					2000::/24 ~ pxs, ",", 2000:4000::/24 ~ pxs, ",", 2000::/26 ~ pxs, ",",
-					2000:8000::/26 ~ pxs, ",", 2000::/28 ~ pxs, ",", 2000:FFF0::/28 ~ pxs;
-	print "  must be false: ",	1000::/7 ~ pxs,  ",", 1000::/13 ~ pxs, ",", 1000::/16 ~ pxs, ",",
-					2000::/16 ~ pxs, ",", 2000::/23 ~ pxs, ",", 2000::/29 ~ pxs, ",",
-					1100::/10 ~ pxs, ",", 2010::/26 ~ pxs;
-}
-
-function __startup() 
-int i;
-bool b;
-prefix px;
-ip p;
-pair pp;
-int set is;
-prefix set pxs;
-string str;
-{ 
-	print "Testing filter language:";
-	i = four; 
-	i = 12*100 + 60/2 + i; 
-	i = ( i + 0 );
-	print "  arithmetics: 1234 = ", i;
-	printn "  if statements ";
-	print "what happens here?";
-	printn ".";
-	if (i = 4) then { print "*** FAIL: if 0"; quitbird; } else printn ".";
-#	if !(i = 3) then { print "*** FAIL: if 0"; quitbird; } else printn ".";
-	if 1234 = i then printn "."; else { print "*** FAIL: if 1 else"; }
-#	if 1 <= 1 then printn "."; else { print "*** FAIL: test 3"; }
-	if 1234 < 1234 then { print "*** FAIL: test 4"; quitbird; } else print "ok";
-	is = [ 2, 3, 4, 7..11 ];
-	print "  must be true: ", 1180::/16 ~ [ 1100::/8{ 15 , 17 } ];
-	print "  data types; must be true: ", 12::34 = 12::34, ",", 1 ~ [1,2,3], ",", 5 ~ [1..20], ",", 10 ~ is, ",", 2 ~ [ 1, 2, 3 ], ",", 5 ~ [ 4 .. 7 ], ",", 12::34 ~ [ 12::33..12::35 ], ",", 1020::34 ~ 1000::/8, ",", 1000::/8 ~ 1000::/8, ",", 1000::/8 ~ [ 1000::/8+ ];
-	print "  must be true: ", true && true, ",", true || false;
-
-#	print "  must be true: ", defined(1), ",", defined(1.2.3.4), ",", 1 != 2, ",", 1 <= 2;
-	print "  data types: must be false: ", 1 ~ [ 2, 3, 4 ], ",", 5 ~ is, ",", 12::34 ~ [ 12::33, 12::35 ], ",", (1,2) > (2,2), ",", (1,1) > (1,1), ",", 1000::/9 ~ [ 1000::/8- ], ",", 1000::/17 ~ [ 1000::/8{ 15 , 16 } ], ",", true && false;
-
-	px = 1020::/18;
-	print "Testing prefixes: 1020::/18 = ", px;
-	p = 1234:5678::;
-	print "Testing mask : 1200:: = ", p.mask(8);
-	
-	pp = (1, 2);
-	print "Testing pairs: (1,2) = ", (1,2), " = ", pp;
-	print "Testing enums: ", RTS_DUMMY, " ", RTS_STATIC;
-
-	str = "Hello";
-	print "Testing string: ", str, " true: ", str ~ "Hell*", " false: ", str ~ "ell*";
-	
-	b = true;
-	print "Testing bool: ", b, ", ", !b;
-	
-	pxs = [ 1102::/16, 1104::/16+];
-	print "Testing prefix sets: ";
-	print pxs;
-	print "  must be true:  ",	1102::/16 ~ pxs, ",", 1104::/16 ~ pxs, ",", 1104::/18 ~ pxs, ",", 1104::/32 ~ pxs;
-	print "  must be false: ",	1101::/16 ~ pxs, ",", 1103::/16 ~ pxs, ",", 1102::/15 ~ pxs, ",", 1102::/17 ~ pxs, ",",
-					1102::/32 ~ pxs, ",", 1104::/15 ~ pxs;
-
-	test_pxset([ 1000::/16{8,12}, 2000::/16{24,28} ]);
-	print "What will this do? ", [ 1, 2, 1, 1, 1, 3, 4, 1, 1, 1, 5 ];
-
-	print "Testing functions...";
-#	callme ( 1, 2 );
-	callme ( 2, 2 );
-	callme ( 2, 2 );
-	callme ( 3, 2 );
-	callme ( 4, 2 );
-	callme ( 7, 2 );
-
-	i = fifteen();
-	print "Testing function calls: 15 = ", i;
-
-	_paths();
-
-	print "done";
-	return 0;
-	print "*** FAIL: this is unreachable";
-	quitbird;  # quit with err exit code 1
-}
-
-filter testf 
-int j; 
-{ 
-	print "Heya, filtering route to ", net.ip, " prefixlen ", net.len, " source ", source;
-	print "This route was from ", from;
-	j = 7;
-	j = 17;
-	if rip_metric > 15 then {
- 		reject "RIP Metric is more than infinity";
-	}
-	rip_metric = 14;
-	unset(rip_metric);
-		
-	accept "ok I take that";
-}
-
-eval __startup();
\ No newline at end of file