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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. brain‏ @shmit 7 Nov 2014
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      does @google have working PMTU discovery? my IPv6 firewall is off and i have to manually set my MTU to 1280 to get to http://google.com 

      2 replies 0 retweets 0 likes
    2. Hector Martin‏ @marcan42 8 Nov 2014
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      Replying to @shmit

      .@shmit @paulnivin Same here - it seems IPV6 PMTU discovery broke yesterday-ish on @Google properties. Works end-to-end with my own server.

      1 reply 2 retweets 0 likes
    3. Manawyrm‏ @Manawyrm 8 Nov 2014
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      Replying to @marcan42

      @marcan42 @shmit @paulnivin @google Works fine for me at german provider KD and Hetzner.

      1 reply 0 retweets 0 likes
    4. Hector Martin‏ @marcan42 8 Nov 2014
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      Replying to @Manawyrm

      @Manawyrm @shmit @paulnivin Are you testing with an MTU bottleneck at a router (not end host)? My router/tunnel have MTU=1280.

      3 replies 0 retweets 0 likes
    5. Manawyrm‏ @Manawyrm 8 Nov 2014
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      Replying to @marcan42

      @marcan42 @shmit @paulnivin at work, which uses a Hurricane Electric tunnel.

      2 replies 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 8 Nov 2014
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      Replying to @Manawyrm

      @Manawyrm @shmit @paulnivin I am on HE indeed. Wonder if it's just them. Works with my server though... Could be only some MTU ranges?

      2 replies 0 retweets 0 likes
    7. Manawyrm‏ @Manawyrm 8 Nov 2014
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      Replying to @marcan42

      @marcan42 @shmit @paulnivin Strangly enough, I've had MTU Path Discovery issues with HE for a long time now.

      1 reply 0 retweets 0 likes
    8. brain‏ @shmit 8 Nov 2014
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      Replying to @Manawyrm

      @manawyrm @marcan42 @paulnivin one of mine goes from server -> L3 -> google, and only inside google do pings start to fail

      2 replies 0 retweets 0 likes
    9. Hector Martin‏ @marcan42 8 Nov 2014
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      Replying to @shmit

      @shmit @Manawyrm @paulnivin For me the first bad hop is 2001:de8:5::1:5169:1/15169.tyo.equinix.com (seems Google specific but Equinix IP)

      1 reply 0 retweets 0 likes
    10. Hector Martin‏ @marcan42 8 Nov 2014
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      Replying to @marcan42

      @shmit @Manawyrm @paulnivin They also seem to be blocking fragmented pings. Confuses diagnosis.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 8 Nov 2014
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      @shmit @Manawyrm @paulnivin E.g. send fragmented ping over clean 1500-MTU path, nothing comes back. Send it one piece, works.

      7:56 AM - 8 Nov 2014
      3 replies 0 retweets 0 likes
        1. Manawyrm‏ @Manawyrm 8 Nov 2014
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          Replying to @marcan42

          @marcan42 @shmit @paulnivin Could just reproduce the issue on one of my OpenVZ test machines. Yes, there seems to be a strange

          0 replies 0 retweets 1 like
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        1. Manawyrm‏ @Manawyrm 8 Nov 2014
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          Replying to @marcan42

          @marcan42 @shmit @paulnivin misconfiguration there. Hmm.

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 8 Nov 2014
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          Replying to @Manawyrm

          @Manawyrm @shmit @paulnivin I repro'd it on my http://online.net  server (direct peering to Google, no middlemen)pic.twitter.com/OrPv1nuuOj

          0 replies 0 retweets 0 likes
          3. End of conversation
        1. brain‏ @shmit 8 Nov 2014
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          Replying to @marcan42

          @marcan42 @manawyrm @paulnivin i'm sending pings out unfrag'd. not seeing PMTU packets come back from google

          0 replies 0 retweets 0 likes
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