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by fragmede 798 days ago
The protocol is specified by a byte in the IP packet; how many middleware boxes block everything except for ICMP, TCP, and UDP? What is the probability that a packet with that byte set to something unexpected actually gets from source to destination?
3 comments
znpy 798 days ago
The “funny” thing is that http3 really really looks like a transport protocol encapsulated into… uso. Exactly because many middle boxes block anything that’s not a very well known protocol
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n_plus_1_acc 797 days ago
The internet is just broken and only works because of lot of hacked bandaids.
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throw0101c 797 days ago
> The protocol is specified by a byte in the IP packet; how many middleware boxes block everything except for ICMP, TCP, and UDP?

Most firewalls are default deny out of the box and you have to allow things through. How many folks bother opening up SCTP/DCCP/etc?

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Hikikomori 798 days ago
How does sctp work with NAT that your typical home box uses?
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lttlrck 797 days ago
SCTP can run over UDP. It's part of the spec.

Now we have HTTP3 which runs over UDP - where there is a will, there is a way.

Perhaps SCTP was ahead of its time.

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throw0101c 797 days ago
> SCTP can run over UDP. It's part of the spec.

SCTP over UDP came out in 2013:

* https://datatracker.ietf.org/doc/html/rfc6951

SCTP came out in 2000:

* https://datatracker.ietf.org/doc/html/rfc2960

Over a decade is quite a while in Internet-time.

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