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thatcks's profile
Chris Siebenmann
Chris Siebenmann
Chris Siebenmann
@thatcks

Chris Siebenmann

@thatcks

That cks. Overcommitted sysadmin, photographer, bicyclist, and other multitudes. I write a lot of words for a programmer.

Joined December 2011
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    Chris Siebenmann ‏@thatcks Jan 15

    My co-workers are currently physically bisecting a network to discover what's making most unicast ARP replies disappear mysteriously.

    • Like 1
    • grawity
    11:17 AM - 15 Jan 2016
    0 retweets 1 like
      1. (((Norman Wilson))) ‏@oclsc Jan 15

        @thatcks Probably because the packet headers were protanomalous.

        0 retweets 0 likes
      2. Chris Siebenmann ‏@thatcks Jan 15

        @oclsc In this case, a 'loop' in the network (in that a 5-port end switch was plugged into two wall drops at once).

        0 retweets 0 likes
      3. (((Norman Wilson))) ‏@oclsc Jan 15

        @thatcks No spanning-tree algorithm? (In the big switches, not the small one)

        0 retweets 0 likes
      4. View other replies
      5. Chris Siebenmann ‏@thatcks Jan 15

        @oclsc No STP. It's unnecessary for a pure tree (which we're supposed to be) and I think we've had problems with it in the past.

        0 retweets 0 likes
      6. Justin Azoff ‏@JustinAzoff Jan 17

        @thatcks @oclsc well, not running STP (or bpdu guard or port security or storm control..) is causing you problems now..

        0 retweets 0 likes
      7. Chris Siebenmann ‏@thatcks Jan 18

        @JustinAzoff @oclsc People breaking our networks with loops is a very occasional thing, fortunately. Perhaps once a year at most.

        0 retweets 0 likes
      8. (((Norman Wilson))) ‏@oclsc Jan 18

        @thatcks @JustinAzoff Yep. Cost-benefit tradeoff. Us too: I forget whether we enable STP but similar issues obtain.

        0 retweets 0 likes

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