diff -uNr systemd-228/src/libsystemd/sd-network/sd-network.c systemd-228-query-duid/src/libsystemd/sd-network/sd-network.c
--- systemd-228/src/libsystemd/sd-network/sd-network.c	2015-11-18 07:59:06.000000000 +0000
+++ systemd-228-query-duid/src/libsystemd/sd-network/sd-network.c	2016-04-01 00:28:06.272671837 +0000
@@ -297,6 +297,51 @@
         return network_get_link_strv("CARRIER_BOUND_BY", ifindex, ret);
 }
 
+static int network_get_file_str(const char *key, const char *fpath, int ifindex, char **ret) {
+        _cleanup_free_ char *p = NULL, *s = NULL;
+        int r;
+
+        assert_return(ifindex > 0, -EINVAL);
+        assert_return(fpath, -EINVAL);
+        assert_return(ret, -EINVAL);
+
+        if (asprintf(&p, "%s/%d", fpath, ifindex) < 0)
+                return -ENOMEM;
+
+        r = parse_env_file(p, NEWLINE, key, &s, NULL);
+        if (r == -ENOENT)
+                return -ENODATA;
+        if (r < 0)
+                return r;
+        if (isempty(s))
+                return -ENODATA;
+
+        *ret = s;
+        s = NULL;
+        return 0;
+}
+
+_public_ int sd_network_link_get_clientid(int ifindex, char **clientid) {
+        return network_get_file_str("CLIENTID",
+                                    "/run/systemd/netif/leases",
+                                    ifindex,
+                                    clientid);
+}
+
+_public_ int sd_network_link_get_iaid(int ifindex, char **iaid) {
+        return network_get_file_str("IAID",
+                                    "/run/systemd/netif/leases6",
+                                    ifindex,
+                                    iaid);
+}
+
+_public_ int sd_network_link_get_duid(int ifindex, char **duid) {
+        return network_get_file_str("DUID",
+                                    "/run/systemd/netif/leases6",
+                                    ifindex,
+                                    duid);
+}
+
 _public_ int sd_network_link_get_wildcard_domain(int ifindex) {
         int r;
         _cleanup_free_ char *p = NULL, *s = NULL;
diff -uNr systemd-228/src/libsystemd-network/dhcp6-lease-internal.h systemd-228-query-duid/src/libsystemd-network/dhcp6-lease-internal.h
--- systemd-228/src/libsystemd-network/dhcp6-lease-internal.h	2015-11-18 07:59:06.000000000 +0000
+++ systemd-228-query-duid/src/libsystemd-network/dhcp6-lease-internal.h	2016-04-01 00:33:09.083805301 +0000
@@ -25,6 +25,7 @@
 #include <stdint.h>
 
 #include "sd-dhcp6-lease.h"
+#include "dhcp-identifier.h"
 #include "dhcp6-internal.h"
 
 struct sd_dhcp6_lease {
@@ -36,6 +37,8 @@
         bool rapid_commit;
 
         DHCP6IA ia;
+        struct duid *duid;
+        size_t duid_len;
 
         DHCP6Address *addr_iter;
 
@@ -64,6 +67,7 @@
 int dhcp6_lease_get_rapid_commit(sd_dhcp6_lease *lease, bool *rapid_commit);
 
 int dhcp6_lease_get_iaid(sd_dhcp6_lease *lease, be32_t *iaid);
+int dhcp6_lease_set_duid(sd_dhcp6_lease *lease, struct duid *duid, size_t duid_len);
 
 int dhcp6_lease_set_dns(sd_dhcp6_lease *lease, uint8_t *optval, size_t optlen);
 int dhcp6_lease_set_domains(sd_dhcp6_lease *lease, uint8_t *optval,
@@ -74,5 +78,7 @@
 
 int dhcp6_lease_new(sd_dhcp6_lease **ret);
 
+int dhcp6_lease_save(sd_dhcp6_lease *lease, const char *lease_file);
+
 DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp6_lease*, sd_dhcp6_lease_unref);
 #define _cleanup_dhcp6_lease_free_ _cleanup_(sd_dhcp6_lease_unrefp)
diff -uNr systemd-228/src/libsystemd-network/sd-dhcp6-client.c systemd-228-query-duid/src/libsystemd-network/sd-dhcp6-client.c
--- systemd-228/src/libsystemd-network/sd-dhcp6-client.c	2016-04-01 00:10:28.311819290 +0000
+++ systemd-228-query-duid/src/libsystemd-network/sd-dhcp6-client.c	2016-04-01 07:27:44.868086900 +0000
@@ -202,6 +202,23 @@
         return 0;
 }
 
+int sd_dhcp6_client_get_duid(sd_dhcp6_client *client, uint16_t *duid_type,
+                             const uint8_t **duid, size_t *duid_len) {
+        assert_return(client, -EINVAL);
+        assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY);
+
+        *duid_type = 0;
+        *duid_len = 0;
+        *duid = NULL;
+        if (client->duid_len > 0) {
+                *duid_type = be16toh(client->duid.type);
+                *duid_len = client->duid_len - sizeof(client->duid.type);
+                *duid = client->duid.raw.data;
+        }
+
+        return 0;
+}
+
 int sd_dhcp6_client_set_iaid(sd_dhcp6_client *client, uint32_t iaid) {
         assert_return(client, -EINVAL);
         assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY);
@@ -211,6 +228,14 @@
         return 0;
 }
 
+int sd_dhcp6_client_get_iaid(sd_dhcp6_client *client, uint32_t *iaid) {
+        assert_return(client, -EINVAL);
+
+        *iaid = be32toh(client->ia_na.id);
+
+        return 0;
+}
+
 int sd_dhcp6_client_set_information_request(sd_dhcp6_client *client, int enabled) {
         assert_return(client, -EINVAL);
         assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY);
@@ -746,6 +771,10 @@
                         if (r < 0 && r != -ENOMSG)
                                 return r;
 
+                        r = dhcp6_lease_set_duid(lease, &client->duid, client->duid_len);
+                        if (r < 0)
+                                return r;
+
                         r = dhcp6_lease_get_iaid(lease, &iaid_lease);
                         if (r < 0)
                                 return r;
diff -uNr systemd-228/src/libsystemd-network/sd-dhcp6-lease.c systemd-228-query-duid/src/libsystemd-network/sd-dhcp6-lease.c
--- systemd-228/src/libsystemd-network/sd-dhcp6-lease.c	2015-11-18 07:59:06.000000000 +0000
+++ systemd-228-query-duid/src/libsystemd-network/sd-dhcp6-lease.c	2016-04-01 07:27:03.013301683 +0000
@@ -20,14 +20,19 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#include <arpa/inet.h>
 #include <errno.h>
 
 #include "alloc-util.h"
 #include "dhcp6-lease-internal.h"
 #include "dhcp6-protocol.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "hexdecoct.h"
 #include "strv.h"
 #include "util.h"
 
+
 int dhcp6_lease_clear_timers(DHCP6IA *ia) {
         assert_return(ia, -EINVAL);
 
@@ -150,6 +155,15 @@
         return 0;
 }
 
+int dhcp6_lease_set_duid(sd_dhcp6_lease *lease, struct duid *duid, size_t duid_len) {
+        assert_return(lease, -EINVAL);
+        assert_return(duid, -EINVAL);
+
+        lease->duid = duid;
+        lease->duid_len = duid_len;
+        return 0;
+}
+
 int sd_dhcp6_lease_get_address(sd_dhcp6_lease *lease, struct in6_addr *addr,
                                uint32_t *lifetime_preferred,
                                uint32_t *lifetime_valid) {
@@ -410,3 +424,74 @@
         *ret = lease;
         return 0;
 }
+
+int dhcp6_lease_save(sd_dhcp6_lease *lease, const char *lease_file) {
+        _cleanup_free_ char *temp_path = NULL;
+        _cleanup_fclose_ FILE *f = NULL;
+        char addr6[INET6_ADDRSTRLEN];
+        const char *paddr6;
+        struct in6_addr ip6_addr;
+        uint32_t lifetime_preferred, lifetime_valid;
+        be32_t iaid_lease;
+        const struct in6_addr *addresses;
+        int r;
+
+        assert(lease);
+        assert(lease_file);
+
+        r = fopen_temporary(lease_file, &f, &temp_path);
+        if (r < 0)
+                goto fail;
+
+        fchmod(fileno(f), 0644);
+
+        fprintf(f, "# This is private data. Do not parse.\n");
+
+        sd_dhcp6_lease_reset_address_iter(lease);
+        do {
+                r = sd_dhcp6_lease_get_address(lease, &ip6_addr,
+                                               &lifetime_preferred,
+                                               &lifetime_valid);
+                if (r >= 0) {
+                        paddr6 = inet_ntop(AF_INET6, &ip6_addr, addr6,
+                                           INET6_ADDRSTRLEN);
+                        if (paddr6 != NULL) {
+                                fprintf(f, "ADDRESS=%s\n", paddr6);
+                                fprintf(f, "LIFETIME_PREFERRED=%u\n", lifetime_preferred);
+                                fprintf(f, "LIFETIME_VALID=%u\n", lifetime_valid);
+                        }
+                }
+        } while (r >=0);
+
+        r = dhcp6_lease_get_iaid(lease, &iaid_lease);
+        if (r == 0)
+                fprintf(f, "IAID=%u\n", be32toh(iaid_lease));
+
+        if (lease->duid_len > 0) {
+                _cleanup_free_ char *duid_hex;
+
+                duid_hex = hexmem(lease->duid, lease->duid_len);
+                if (duid_hex == NULL) {
+                        r = -ENOMEM;
+                        goto fail;
+                }
+                fprintf(f, "DUID=%s\n", duid_hex);
+        }
+
+        r = fflush_and_check(f);
+        if (r < 0)
+                goto fail;
+
+        if (rename(temp_path, lease_file) < 0) {
+                r = -errno;
+                goto fail;
+        }
+
+        return 0;
+
+fail:
+        if (temp_path)
+                (void) unlink(temp_path);
+
+        return log_error_errno(r, "Failed to save lease data %s: %m", lease_file);
+}
diff -uNr systemd-228/src/network/networkctl.c systemd-228-query-duid/src/network/networkctl.c
--- systemd-228/src/network/networkctl.c	2015-11-18 07:59:06.000000000 +0000
+++ systemd-228-query-duid/src/network/networkctl.c	2016-04-01 00:34:03.926201756 +0000
@@ -502,6 +502,7 @@
                 const char *name) {
         _cleanup_strv_free_ char **dns = NULL, **ntp = NULL, **domains = NULL;
         _cleanup_free_ char *setup_state = NULL, *operational_state = NULL, *tz = NULL;
+        _cleanup_free_ char *clientid = NULL, *duid = NULL, *iaid = NULL;
         _cleanup_netlink_message_unref_ sd_netlink_message *req = NULL, *reply = NULL;
         _cleanup_device_unref_ sd_device *d = NULL;
         char devid[2 + DECIMAL_STR_MAX(int)];
@@ -668,7 +669,19 @@
 
         (void) sd_network_link_get_timezone(ifindex, &tz);
         if (tz)
-                printf("       Time Zone: %s", tz);
+                printf("       Time Zone: %s\n", tz);
+
+        (void) sd_network_link_get_clientid(ifindex, &clientid);
+        if (clientid)
+                printf("        CLIENTID: %s\n", clientid);
+
+        (void) sd_network_link_get_iaid(ifindex, &iaid);
+        if (iaid)
+                printf("            IAID: %s\n", iaid);
+
+        (void) sd_network_link_get_duid(ifindex, &duid);
+        if (duid)
+                printf("            DUID: %s", duid);
 
         return 0;
 }
diff -uNr systemd-228/src/network/networkd-dhcp6.c systemd-228-query-duid/src/network/networkd-dhcp6.c
--- systemd-228/src/network/networkd-dhcp6.c	2016-04-01 00:10:28.311819290 +0000
+++ systemd-228-query-duid/src/network/networkd-dhcp6.c	2016-04-01 07:18:35.972253096 +0000
@@ -113,6 +113,8 @@
                         return r;
         }
 
+        link->dhcp6_lease = sd_dhcp6_lease_ref(lease);
+
         return 0;
 }
 
@@ -134,7 +136,9 @@
                 if (sd_dhcp6_client_get_lease(client, NULL) >= 0)
                         log_link_warning(link, "DHCPv6 lease lost");
 
+                link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
                 link->dhcp6_configured = false;
+                link_dirty(link);
                 break;
 
         case SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE:
@@ -153,6 +157,7 @@
                 }
 
                 link->dhcp6_configured = true;
+                link_dirty(link);
                 break;
 
         default:
diff -uNr systemd-228/src/network/networkd-link.c systemd-228-query-duid/src/network/networkd-link.c
--- systemd-228/src/network/networkd-link.c	2016-04-01 00:10:28.311819290 +0000
+++ systemd-228-query-duid/src/network/networkd-link.c	2016-04-01 07:17:01.523047845 +0000
@@ -26,6 +26,7 @@
 #include "alloc-util.h"
 #include "bus-util.h"
 #include "dhcp-lease-internal.h"
+#include "dhcp6-lease-internal.h"
 #include "event-util.h"
 #include "fd-util.h"
 #include "fileio.h"
@@ -371,6 +372,11 @@
         if (r < 0)
                 return -ENOMEM;
 
+        r = asprintf(&link->lease6_file, "/run/systemd/netif/leases6/%d",
+                     link->ifindex);
+        if (r < 0)
+                return -ENOMEM;
+
         r = asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d",
                      link->ifindex);
         if (r < 0)
@@ -421,8 +427,10 @@
         sd_dhcp_server_unref(link->dhcp_server);
         sd_dhcp_client_unref(link->dhcp_client);
         sd_dhcp_lease_unref(link->dhcp_lease);
+        sd_dhcp_lease_unref(link->dhcp6_lease);
 
         free(link->lease_file);
+        free(link->lease6_file);
 
         sd_lldp_free(link->lldp);
 
@@ -2749,6 +2757,7 @@
         assert(link);
         assert(link->state_file);
         assert(link->lease_file);
+        assert(link->lease6_file);
         assert(link->manager);
 
         if (link->state == LINK_STATE_LINGER) {
@@ -3004,6 +3013,31 @@
         } else
                 unlink(link->lease_file);
 
+        if (link->dhcp6_lease) {
+                struct in6_addr addr6;
+                uint32_t lp, lv;
+                assert(link->network);
+
+                fputs("DHCP6_ADDRESS=", f);
+
+                sd_dhcp6_lease_reset_address_iter(link->dhcp6_lease);
+                while (sd_dhcp6_lease_get_address(link->dhcp6_lease,
+                                                  &addr6, &lp, &lv) >= 0) {
+                        serialize_in6_addrs(f, &addr6, 1);
+                        fputc(' ', f);
+                }
+                fputc('\n', f);
+
+                r = dhcp6_lease_save(link->dhcp6_lease, link->lease6_file);
+                if (r < 0)
+                        goto fail;
+
+                fprintf(f,
+                        "DHCP6_LEASE=%s\n",
+                        link->lease6_file);
+        } else
+                unlink(link->lease6_file);
+
         if (link->ipv4ll) {
                 struct in_addr address;
 
diff -uNr systemd-228/src/network/networkd-link.h systemd-228-query-duid/src/network/networkd-link.h
--- systemd-228/src/network/networkd-link.h	2015-11-18 07:59:06.000000000 +0000
+++ systemd-228-query-duid/src/network/networkd-link.h	2016-04-01 00:36:41.985533245 +0000
@@ -92,6 +92,7 @@
         sd_dhcp_client *dhcp_client;
         sd_dhcp_lease *dhcp_lease;
         char *lease_file;
+        char *lease6_file;
         uint16_t original_mtu;
         unsigned dhcp4_messages;
         bool dhcp4_configured;
@@ -111,6 +112,7 @@
 
         sd_ndisc *ndisc_router_discovery;
         sd_dhcp6_client *dhcp6_client;
+        sd_dhcp6_lease *dhcp6_lease;
         bool rtnl_extended_attrs;
 
         sd_lldp *lldp;
diff -uNr systemd-228/src/network/networkd.c systemd-228-query-duid/src/network/networkd.c
--- systemd-228/src/network/networkd.c	2016-04-01 00:10:28.311819290 +0000
+++ systemd-228-query-duid/src/network/networkd.c	2016-04-01 00:34:47.084920360 +0000
@@ -66,6 +66,10 @@
         if (r < 0)
                 log_warning_errno(r, "Could not create runtime directory 'leases': %m");
 
+        r = mkdir_safe_label("/run/systemd/netif/leases6", 0755, uid, gid);
+        if (r < 0)
+                log_warning_errno(r, "Could not create runtime directory 'leases6': %m");
+
         r = mkdir_safe_label("/run/systemd/netif/lldp", 0755, uid, gid);
         if (r < 0)
                 log_warning_errno(r, "Could not create runtime directory 'lldp': %m");
diff -uNr systemd-228/src/systemd/sd-dhcp6-client.h systemd-228-query-duid/src/systemd/sd-dhcp6-client.h
--- systemd-228/src/systemd/sd-dhcp6-client.h	2016-04-01 00:10:28.311819290 +0000
+++ systemd-228-query-duid/src/systemd/sd-dhcp6-client.h	2016-04-01 00:27:00.250621617 +0000
@@ -54,7 +54,10 @@
                             size_t addr_len, uint16_t arp_type);
 int sd_dhcp6_client_set_duid(sd_dhcp6_client *client, uint16_t duid_type,
                              uint8_t *duid, size_t duid_len);
+int sd_dhcp6_client_get_duid(sd_dhcp6_client *client, uint16_t *duid_type,
+                             const uint8_t **duid, size_t *duid_len);
 int sd_dhcp6_client_set_iaid(sd_dhcp6_client *client, uint32_t iaid);
+int sd_dhcp6_client_get_iaid(sd_dhcp6_client *client, uint32_t *iaid);
 int sd_dhcp6_client_set_information_request(sd_dhcp6_client *client, int enabled);
 int sd_dhcp6_client_get_information_request(sd_dhcp6_client *client, int *enabled);
 int sd_dhcp6_client_set_request_option(sd_dhcp6_client *client,
diff -uNr systemd-228/src/systemd/sd-network.h systemd-228-query-duid/src/systemd/sd-network.h
--- systemd-228/src/systemd/sd-network.h	2015-11-18 07:59:06.000000000 +0000
+++ systemd-228-query-duid/src/systemd/sd-network.h	2016-04-01 00:27:00.250621617 +0000
@@ -122,6 +122,15 @@
 /* Get the CARRIERS that are bound to current link. */
 int sd_network_link_get_carrier_bound_by(int ifindex, char ***carriers);
 
+/* Get the CLIENTID if the link has a IPv4 DHCP address. */
+int sd_network_link_get_clientid(int ifindex, char **clientid);
+
+/* Get the IAID if the link has a IPv6 DHCP address. */
+int sd_network_link_get_iaid(int ifindex, char **iaid);
+
+/* Get the DUID if the link has a IPv6 DHCP address. */
+int sd_network_link_get_duid(int ifindex, char **duid);
+
 /* Get the timezone that was learnt on a specific link. */
 int sd_network_link_get_timezone(int ifindex, char **timezone);