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  1. I've not had much experience with multicast, never really had a direct issue to deal with it at this point. So I've read ietf's report which left me with a much better understanding. At the same time , the reason I started looking into this, is my local firewall appliance is showing steady and constant attempts to infiltrate the the internal network. Recognising the offending IP sets, this is hundreds, in fact the entire subset attempting to access. Ha you say , must be the ISP implementation to collectively control their networks -- yuuk !!? !!! Since as i understand this, IGMP exists above or outside of the network layer , what could these attempts be used for. I have a few theories, but this is the wrong section of the forum to go into that lol My question to those in the know on this subject, what if anything will I lose by blocking these pings, in fact it's scanning ports as well , generally on :64 , at the same time , I see trillions of attempt on many lower ports, which is my concern. As port 64 as well s many lower ports, are used to easily infiltrate and inject {place something disgusting here} Below is just a few, you can see by the time stamps. And at this time only one IP is hitting me, where many times it's a steady barrage .
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