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RTPS headers will come in on whatever port DDS assigns them to.
Obviously, this isn't a 100% guarantee that the packet is RTPS, but the protocol description here makes it clear that the magic number is ASCII "RTPS".
Disclaimer: This was not tested, so will need to be tested on a system experiencing this issue. I just added the check and toss the packet, I do no additional debug. Unsure what the preferred behavior is, but often times RTPS packets will be seen on autonomous systems, and this could become noisy.