diff --git a/config/config.go b/config/config.go
index 0134cc3f..a0ae91d4 100644
--- a/config/config.go
+++ b/config/config.go
@@ -767,7 +767,10 @@ func parseDNS(rawCfg *RawConfig, hosts *trie.DomainTrie, rules []C.Rule) (*DNS,
 	for _, ns := range dnsCfg.DefaultNameserver {
 		host, _, err := net.SplitHostPort(ns.Addr)
 		if err != nil || net.ParseIP(host) == nil {
-			return nil, errors.New("default nameserver should be pure IP")
+			u, err := url.Parse(ns.Addr)
+			if err != nil || net.ParseIP(u.Host) == nil {
+				return nil, errors.New("default nameserver should be pure IP")
+			}
 		}
 	}