WARNING: Reply from unknown nameserver (squid - cache.log)

Warum finde ich in /var/log/squid/cache.log folgende Warnings. Im Usenet wurde heute berichtet, dass der DNS-Server meines ISP wieder Probleme hatte. 2004/02/12 10:03:44| WARNING: Reply from unknown nameserver [209.187.118.50] 2004/02/12 14:26:52| WARNING: Reply from unknown nameserver [69.46.29.18] 2004/02/12 14:41:51| WARNING: Reply from unknown nameserver [209.187.118.50] 2004/02/12 15:43:21| WARNING: Reply from unknown nameserver [209.187.118.50] 2004/02/12 17:30:44| WARNING: Reply from unknown nameserver [209.187.118.50] 2004/02/12 18:43:16| WARNING: Reply from unknown nameserver [209.187.118.50] 2004/02/12 19:28:36| WARNING: Reply from unknown nameserver [209.187.118.50] Al