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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. Hector Martin‏ @marcan42 22 Jun 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @marcan42

      Apparently they're using RFC1918 space for CgNAT (which is stupid, they should use RFC6598) and it leaks into their colo servers sans NAT.

      1 reply 0 retweets 16 likes
    2. Grant Taylor‏ @DrScriptt 22 Jun 2017
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      • Report NetzDG Violation
      Replying to @marcan42

      Remember that all IPv4 address space is routable. RFC 1918 is usually not routed. (127/8 is debatable.)

      1 reply 0 retweets 1 like
    3. Grant Taylor‏ @DrScriptt 22 Jun 2017
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      Replying to @DrScriptt @marcan42

      I’d argue for bogon filters on internet interface to ISP’s CGNAT space.

      1 reply 0 retweets 0 likes
    4. Hector Martin‏ @marcan42 23 Jun 2017
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      Replying to @DrScriptt

      Thing is RFC1918 is usually reserved for end-user usage. I happen to have a dangerously close 172.17.0.0/16 net on this server internally.

      3 replies 0 retweets 1 like
    5. Hector Martin‏ @marcan42 23 Jun 2017
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      Replying to @marcan42 @DrScriptt

      Had they picked that for their shitty CGNAT, it wouldn't be able to hit my server (result: their customers can't access, everyone else can!)

      1 reply 0 retweets 1 like
    6. Grant Taylor‏ @DrScriptt 23 Jun 2017
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      Replying to @marcan42

      That's where double NATing comes into play. *SHUDDER*

      1 reply 0 retweets 0 likes
    7. Grant Taylor‏ @DrScriptt 23 Jun 2017
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      Replying to @DrScriptt @marcan42

      Double NATing has it's uses. Using it to avoid IP conflicts like this is not fun in any way shape or form.

      1 reply 0 retweets 0 likes
    8. Hector Martin‏ @marcan42 23 Jun 2017
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      Replying to @DrScriptt

      I actually double NAT for my home internet. But the first layer is 1:1, even pings get NATed. Except one TCP port.

      2 replies 0 retweets 0 likes
    9. Grant Taylor‏ @DrScriptt 23 Jun 2017
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      Replying to @marcan42

      Are you doing double NAT by choice? If so, why? I'm curious.

      1 reply 0 retweets 0 likes
    10. Hector Martin‏ @marcan42 23 Jun 2017
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      Replying to @DrScriptt

      I moved most of my routing duties to an x86 box, but I still terminate the PPPoE connection in my OpenWRT Netgear.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 23 Jun 2017
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      Replying to @marcan42 @DrScriptt

      The reason is remote unlock, so I don't have to stick a PPPoE client in my initramfs. Also I have remote access to a serial console via SSH.

      9:34 AM - 23 Jun 2017
      1 reply 0 retweets 0 likes
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        1. Hector Martin‏ @marcan42 23 Jun 2017
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          Replying to @marcan42 @DrScriptt

          Actually I run two PPPoE sessions, and only one (v4) terminates in the Netgear. The other passes through (no NAT or extra routing hop on v6)

          1 reply 0 retweets 0 likes
        2. Grant Taylor‏ @DrScriptt 23 Jun 2017
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          Replying to @marcan42

          Okay. I don't think I would have chosen that. To each his own. You have logical reasons, so no complaint here.

          1 reply 0 retweets 0 likes
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