[Snort-users] DNS SPOOF from my ISP's DNS servers

I regularly get messages like this in my logs:

Jul 2 12:29:00 aldomedina snort: [1:254:2] DNS SPOOF
query response with ttl: 1 min. and no authority
[Classification: Potentially Bad Traffic] [Priority:
2]:
{UDP} 200.23.242.196:53 -> mydinamicip:someport

200.23.242.196 is my ISP's DNS server. I suppose I
shouldn't worry, but why am I getting this responses,
and should I report them either to Telmex or to Snort
false positives team?. TIA

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