Thread

1. a11r · 1789659411 · focus · HN ↗

   Back in 2008 Fujitsu has one of the best performing 10Gbps Switches. We were building 40 Gbps packet sniffers at Google (4x 10 Gbps NICs) and needed switches that could do things like mirror traffic across ports at line rate. Fujitsu was way ahead of the pack. I always wondered what held them back from building a meaningful networking business in the US.

   1. ricksunny · 1789664155 · focus · HN ↗

      >We were building 40 Gbps packet sniffers at Google (4x 10 Gbps NICs) and needed switches that could do things like mirror traffic across ports at line rate

      I'm sure there were good reaasons for this, but man this just sounds bad. Like that's the spec I think NSA must give to their contractors outfitting 611 Folsom Street's Room 641A

      1. teiferer · 1789669194 · focus · HN ↗

         Port mirroring is the network engineer's equivalent of using breakpoints in a debugger for a programmer. It allows you to inspect what happens on the wire to get a clue for what's wrong.

         1. sellmesoap · 1789754219 · focus · HN ↗

            Maybe I'm being naive, but as someone who's spent a lot of time capturing and reading PCAP files, 40GB/s worth of mirror is gonzo nuts! You may already be looking for a needle in a haystack, but this time the haystack is 1/60th of the entire bandwidth of the internet in the year 2000!

            1. teiferer · 1790059016 · focus · HN ↗

               Of course you filter before looking.

               When hitting a breakpoint in your debugger you also don't print the whole 32 GB of RAM. You only look at a few locations.

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