diff --git a/sys/net/gnrc/network_layer/ipv6/nib/_nib-internal.c b/sys/net/gnrc/network_layer/ipv6/nib/_nib-internal.c
index 5c51b126169f6..b252c5de67908 100644
--- a/sys/net/gnrc/network_layer/ipv6/nib/_nib-internal.c
+++ b/sys/net/gnrc/network_layer/ipv6/nib/_nib-internal.c
@@ -619,7 +619,9 @@ int _nib_get_route(const ipv6_addr_t *dst, gnrc_pktsnip_t *pkt,
           (void *)pkt);
     _nib_offl_entry_t *offl = _nib_offl_get_match(dst);
 
-    if (offl == NULL) {
+    if ((offl == NULL) ||
+        /* give default route precedence over off-link PLEs */
+        ((offl->mode == _PL) && !(offl->flags & _PFX_ON_LINK))) {
         _nib_dr_entry_t *router = _nib_drl_get_dr();
 
         if ((router == NULL) && (offl == NULL)) {
diff --git a/sys/net/gnrc/network_layer/ipv6/nib/_nib-router.c b/sys/net/gnrc/network_layer/ipv6/nib/_nib-router.c
index 9b2bd14bc30a4..2a0646abbf60b 100644
--- a/sys/net/gnrc/network_layer/ipv6/nib/_nib-router.c
+++ b/sys/net/gnrc/network_layer/ipv6/nib/_nib-router.c
@@ -102,6 +102,9 @@ static gnrc_pktsnip_t *_offl_to_pio(_nib_offl_entry_t *offl,
 {
     uint32_t now = (xtimer_now_usec64() / US_PER_MS) & UINT32_MAX;
     gnrc_pktsnip_t *pio;
+    gnrc_netif_t *netif = gnrc_netif_get_by_pid(
+            _nib_onl_get_if(offl->next_hop)
+        );
     uint8_t flags = 0;
     uint32_t valid_ltime = (offl->valid_until == UINT32_MAX) ? UINT32_MAX :
                            ((offl->valid_until - now) / MS_PER_SEC);
@@ -111,7 +114,11 @@ static gnrc_pktsnip_t *_offl_to_pio(_nib_offl_entry_t *offl,
     DEBUG("nib: Build PIO for %s/%u\n",
           ipv6_addr_to_str(addr_str, &offl->pfx, sizeof(addr_str)),
           offl->pfx_len);
-    if (offl->flags & _PFX_ON_LINK) {
+    /* do not advertise as on-link if 6LN
+     * https://tools.ietf.org/html/rfc6775#section-6.1 otherwise the PIO will be
+     * ignored by other nodes (https://tools.ietf.org/html/rfc6775#section-5.4)
+     */
+    if ((offl->flags & _PFX_ON_LINK) && !gnrc_netif_is_6ln(netif)) {
         flags |= NDP_OPT_PI_FLAGS_L;
     }
     if (offl->flags & _PFX_SLAAC) {
diff --git a/sys/net/gnrc/network_layer/ipv6/nib/nib_pl.c b/sys/net/gnrc/network_layer/ipv6/nib/nib_pl.c
index 27940320afafc..503f55cb1eaa3 100644
--- a/sys/net/gnrc/network_layer/ipv6/nib/nib_pl.c
+++ b/sys/net/gnrc/network_layer/ipv6/nib/nib_pl.c
@@ -58,7 +58,12 @@ int gnrc_ipv6_nib_pl_set(unsigned iface,
         return 0;
     }
     gnrc_netif_acquire(netif);
-    if (!gnrc_netif_is_6ln(netif) &&
+    /* prefixes within a 6Lo-ND-performing are typically off-link, the
+     * border router however should configure the prefix as on-link to only do
+     * address resolution towards the LoWPAN and not the upstream interface
+     * See https://github.com/RIOT-OS/RIOT/pull/10627 and follow-ups
+     */
+    if ((!gnrc_netif_is_6ln(netif) || gnrc_netif_is_6lbr(netif)) &&
         ((idx = gnrc_netif_ipv6_addr_match(netif, pfx)) >= 0) &&
         (ipv6_addr_match_prefix(&netif->ipv6.addrs[idx], pfx) >= pfx_len)) {
         dst->flags |= _PFX_ON_LINK;