File 0029-dhcp-ip-family-symlinks.patch of Package dhcp.24175

--- client/dhclient.c.orig
+++ client/dhclient.c
@@ -164,6 +164,17 @@ main(int argc, char **argv) {
 #endif /* DHCPv6 */
 	char *s;
 
+#ifdef DHCPv6
+	/* Support being called using `dhclient4` or `dhclient6` symlinks */
+	if (argv[0][strlen(argv[0]) - 1] == '4') {
+		local_family_set = 1;
+		local_family = AF_INET;
+	} else if (argv[0][strlen(argv[0]) - 1] == '6') {
+		local_family_set = 1;
+		local_family = AF_INET6;
+	}
+#endif /* DHCPv6 */
+
 	/* Initialize client globals. */
 	memset(&default_duid, 0, sizeof(default_duid));
 
--- relay/dhcrelay.c.orig
+++ relay/dhcrelay.c
@@ -182,6 +182,15 @@ main(int argc, char **argv) {
 #ifdef DHCPv6
 	struct stream_list *sl = NULL;
 	int local_family_set = 0;
+
+	/* Support being called using `dhcrelay4` or `dhcrelay6` symlinks */
+	if (argv[0][strlen(argv[0]) - 1] == '4') {
+		local_family_set = 1;
+		local_family = AF_INET;
+	} else if (argv[0][strlen(argv[0]) - 1] == '6') {
+		local_family_set = 1;
+		local_family = AF_INET6;
+	}
 #endif
 
 	/* Make sure that file descriptors 0(stdin), 1,(stdout), and
--- server/dhcpd.c.orig
+++ server/dhcpd.c
@@ -195,6 +195,17 @@ main(int argc, char **argv) {
 	char *set_chroot = 0;
 #endif /* PARANOIA */
 
+#ifdef DHCPv6
+	/* Support being called using `dhcpd4` or `dhcpd6` symlinks */
+	if (argv[0][strlen(argv[0]) - 1] == '4') {
+		local_family_set = 1;
+		local_family = AF_INET;
+	} else if (argv[0][strlen(argv[0]) - 1] == '6') {
+		local_family_set = 1;
+		local_family = AF_INET6;
+	}
+#endif /* DHCPv6 */
+
         /* Make sure that file descriptors 0 (stdin), 1, (stdout), and
            2 (stderr) are open. To do this, we assume that when we
            open a file the lowest available file descriptor is used. */