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Re: question about PIM Null-Registers


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  • From: Dino Farinacci <>
  • To:
  • Cc:
  • Subject: Re: question about PIM Null-Registers
  • Date: Mon, 19 May 2003 12:29:40 -0700
>> The TTL of the dummy ip header is not significant. It gets set to 0 when
>> we zero the dummy ip header and is ignored. The only two fields that
>> are significant in the dummy ip header are the source and destination
>> (group) ip address.

And the first nibble of the header is 4? Right? Because if it is not,
you can't be sure the source and destination addresses are where you
expect them to be.

Also, what is the checksum field set to and do you check the checksum?
After all, it is a real IP header.

Dino


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