diff --git a/routlin/core.py b/routlin/core.py
index 5d0db45..76737f1 100644
--- a/routlin/core.py
+++ b/routlin/core.py
@@ -203,10 +203,15 @@ def resolve_vlan_options(vlan):
         }
     overrides = vlan.get("dhcp_information", {}).get("explicit_overrides", {})
     default   = lowest_quartet_ip(vlan)
+    def _resolve(key):
+        v = overrides.get(key, "")
+        if isinstance(v, list):
+            return ','.join(v) if v else default
+        return v or default
     return {
-        "gateway":    overrides.get("gateway",    "") or default,
-        "dns_server": overrides.get("dns_server", "") or default,
-        "ntp_server": overrides.get("ntp_server", "") or default,
+        "gateway":    overrides.get("gateway", "") or default,
+        "dns_server": _resolve("dns_server"),
+        "ntp_server": _resolve("ntp_server"),
     }
 
 def is_physical(vlan):
diff --git a/routlin/validation.py b/routlin/validation.py
index 8f80a61..4ea742a 100644
--- a/routlin/validation.py
+++ b/routlin/validation.py
@@ -566,10 +566,12 @@ def validate_config(data):
                     )
             dns = eo.get("dns_server", "")
             if dns:
-                check_ip("explicit_overrides.dns_server", dns)
+                for _ip in (dns if isinstance(dns, list) else [dns]):
+                    check_ip("explicit_overrides.dns_server", _ip)
             ntp = eo.get("ntp_server", "")
             if ntp:
-                check_ip("explicit_overrides.ntp_server", ntp)
+                for _ip in (ntp if isinstance(ntp, list) else [ntp]):
+                    check_ip("explicit_overrides.ntp_server", _ip)
 
         pool_start = check_ip("dynamic_pool_start", d["dynamic_pool_start"])
         pool_end   = check_ip("dynamic_pool_end",   d["dynamic_pool_end"])