Why only “one” network at all!?

The Internet was purpose designed to tolerate disruption as major as a nuclear war, which it achieves through decentralisation.

Private networks exist to make idiot managers feel more confident while actually dramatically reducing availability by putting all their eggs into a single basket.

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80fj0348i a day ago | parent | next [-]

Many aviation systems predate the internet. Depending on the region, some systems do not use Internet Protocol, let alone TCP.

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jiggawatts a day ago | parent [-]

The FAA Telecommunications Infrastructure (FTI) operated by L3harris was built between 2002 to 2007.

That is already well within the era of IPv6, let alone "the Internet".

There's no excuse.

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MBCook a day ago | parent [-]

For something so incredibly critical in real time, I’m not sure I would want to trust the Internet.

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jiggawatts a day ago | parent | next [-]

When was the last time the Internet "went down" globally?

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80fj0348i a day ago | parent [-]

The last time the internet caused flight outages was September 22nd of this year.

	▲	jiggawatts a day ago \| parent [-]
		Over what area? Localised, nation-wide, or global?

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technol0gic a day ago | parent | prev [-]

thats like mandating using I-95 for all ambulance & firefighter traffic

	▲	Fripplebubby a day ago \| parent [-]
		Isn't using a private network like mandating using I-95 (since it might be blocked from a freak accident one day), while using the internet, with redundant paths between hosts, like allowing the traffic to find the best path?

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cowlevel a day ago | parent | prev | next [-]

The internet is pretty unreliable as it goes, and the internet in your locality is probably only one network (e.g. Comcast's) - what are you gaining by running critical systems over Comcast internet access, instead of Comcast leased line? Saving a few hundred bucks a month, yes, but that's because you're getting less reliability than you actually need.

	▲	donalhunt 20 hours ago \| parent [-]
		Also lower MTTR and more robust SLAs in many cases. Business services will usually result in service credits being issued if the SLO is breached. Residential... not so much.

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ExoticPearTree a day ago | parent | prev [-]

One network can be a fully redundant design with multiple geographically distinct links and so on.

But it does not make it 100% resilient to cascading failures or possible Layer2/3 loops that might happen during a software upgrade, especially in a country wide deployment.

The FAA will give a root cause at some point of why this happenned.