Show HN: How did your computer reach my server?

Re:Show HN: How did your computer reach my server? by nullindividual on Tuesday December 05, 2023 @11:21AM (#38532870)

Here's a paper you might be interested in with regards to how traceroute works. One thing that many (non-network) folks miss is that traceroute is not necessarily symmetrical -- the return path may differ.

https://archive.nanog.org/sites/default/files/traceroute-201...

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Re:Show HN: How did your computer reach my server? by archmaster on Tuesday December 05, 2023 @11:24AM (#38532927)

TY, will read! I touched on this duality in the article actually :)

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Re:Show HN: How did your computer reach my server? by justsomehnguy on Tuesday December 05, 2023 @02:26PM (#38535714)

It's extremely rare but the data paths can be asymmetrical too. Eg satellite with a ground based uplink.

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Re:Show HN: How did your computer reach my server? by ta1243 on Tuesday December 05, 2023 @05:37PM (#38537887)

Due to internet problems in Egypt earlier today with Telecom Egypt, I had a traceroute to the same destination going via _8_ different paths. Have to say that's twice the higher number of ECMPs I've seen on the internet in the past.

And yes, traffic is routing different ways from my Cairo office to my UK core --London ->Cairo is direct and still suffering massive loss, Cairo->London is now routing via ntt and seems fine. If they haven't fixed it by tomorrow might have to change some local prefs.

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