[PLUG] Are DNS requests with bad checksums dropped?

    localhost.46633 > localhost.domain: [bad udp cksum 0xfe90 -> 0x1013!] 32170+ [1au] A? rr2---sn-bvvbax-2iae.googlevideo.com. ar: . OPT UDPsize=1200 (65)
    localhost.domain > localhost.46633: [bad udp cksum 0xfe90 -> 0x64b5!] 32170 ServFail* q: A? rr2---sn-bvvbax-2iae.googlevideo.com. 0/0/1 ar: . OPT UDPsize=65494 (65)
    localhost.46633 > localhost.domain: [bad udp cksum 0xfe90 -> 0x76f4!] 5806+ [1au] AAAA? rr2---sn-bvvbax-2iae.googlevideo.com. ar: . OPT UDPsize=1200 (65)
    localhost.domain > localhost.46633: [bad udp cksum 0xfe90 -> 0xcb96!] 5806 ServFail* q: AAAA? rr2---sn-bvvbax-2iae.googlevideo.com. 0/0/1 ar: . OPT UDPsize=65494 (65)
    localhost.44911 > localhost.domain: [bad udp cksum 0xfe90 -> 0x3214!] 25187+ [1au] A? rr2---sn-bvvbax-2iae.googlevideo.com. ar: . OPT UDPsize=1200 (65)

I had a discussion with a friend of mine about unusual UDP traffic I have seen, and my friend argues that UDP is standard for streaming video today, but when I watch Youtube and run tcpdump, you can see that there are bad packets.

I want to know why UDP is superior for streaming video, because my understanding is that bad packets like this are dropped if they are UDP.  Is this not the case?  Can someone please clarify this?  I got this output from running

"tcpdump -vvfA" while watching Youtube on an Ubuntu 22.04 laptop.

Thank you,

Michael Lazin

Michael Lazin

.. τὸ γὰρ αὐτὸ νοεῖν ἐστίν τε καὶ εἶναι.

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