--- /n/sources/plan9/sys/src/libip/myipaddr.c	Wed Nov 26 06:00:03 2003
+++ /sys/src/libip/myipaddr.c	Wed Feb 13 18:56:21 2019
@@ -14,9 +14,15 @@
 	0xff, 0xff, 0xff, 0xff,
 	0xff, 0, 0, 0
 };
+static uchar loopback6[IPaddrlen] = {
+	0, 0, 0, 0,
+	0, 0, 0, 0,
+	0, 0, 0, 0,
+	0, 0, 0, 1
+};
 
-// find first ip addr that isn't the friggin loopback address
-// unless there are no others
+// find first ip that isn't a friggin loopback or
+// link-local address. prefer v4 over v6.
 int
 myipaddr(uchar *ip, char *net)
 {
@@ -25,18 +31,39 @@
 	static Ipifc *ifc;
 	uchar mynet[IPaddrlen];
 
+	ipmove(ip, IPnoaddr);
 	ifc = readipifc(net, ifc, -1);
-	for(nifc = ifc; nifc; nifc = nifc->next)
-		for(lifc = nifc->lifc; lifc; lifc = lifc->next){
-			maskip(lifc->ip, loopbackmask, mynet);
-			if(ipcmp(mynet, loopbacknet) == 0){
+	for(nifc = ifc; nifc != nil; nifc = nifc->next){
+		for(lifc = nifc->lifc; lifc != nil; lifc = lifc->next){
+			/* unspecified */
+			if(ipcmp(lifc->ip, IPnoaddr) == 0)
 				continue;
-			}
-			if(ipcmp(lifc->ip, IPnoaddr) != 0){
+
+			if(isv4(lifc->ip)){
+				/* ipv4 loopback */
+				maskip(lifc->ip, loopbackmask, mynet);
+				if(ipcmp(mynet, loopbacknet) == 0)
+					continue;
+
 				ipmove(ip, lifc->ip);
 				return 0;
 			}
+
+			/* already got a v6 address? */
+			if(ipcmp(ip, IPnoaddr) != 0)
+				continue;
+
+			/* ipv6 loopback */
+			if(ipcmp(lifc->ip, loopback6) == 0)
+				continue;
+
+			/* ipv6 linklocal */
+			if(ISIPV6LINKLOCAL(lifc->ip))
+				continue;
+
+			/* save first v6 address */
+			ipmove(ip, lifc->ip);
 		}
-	ipmove(ip, IPnoaddr);
-	return -1;
+	}
+	return ipcmp(ip, IPnoaddr) != 0 ? 0 : -1;
 }