On 23.02.2013 22:40, Spain, Dr. Jeffry A. wrote:
>> Most likely your Internet provider already implements bogon filtering 
>> on their border routers. So filtering again on your firewall is a bit 
>> over the top.
> 
> I have a more skeptical view of our ISP, but perhaps I will ask them
> about it. Thanks to all for your insights. Jeff.

Even if your own provider isn't doing any bogon filtering, other 
providers and most definitely all transit providers are doing bogon 
filtering.

I'm not saying you shouldn't implement it, but chances are very slim 
that it will ever help you.

Moreover, the bogon list changes every now and the so you have to 
update them on your firewall.

Greets,

Sander

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