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  • Weirdly Long DNS Switchover?

    February 16th, 2021
    tech
    [EDIT: as Jai points out, the problem was likely forgetting IPv6. The AAAA record is now updated, and I should be able to tell in a few hours whether that fixed it.]

    I'm helping my dad migrate some code to a new server. It was at 162.209.99.139 for years, but ten days ago he changed his DNS settings to point to 34.199.143.13. Everything looks good to me:

    $ dig notes.billingadvantage.com
    notes.billingadvantage.com. 1800
        IN    A    34.199.143.13
    
    The TTL is 1800s, or 30min, which agrees with dns.google. I expected everyone would be moved over within a couple hours, but a week later the old server is still receiving traffic nearly as much as the new:

    date old server new server
    2021-02-05 943 0
    2021-02-06 201 127
    2021-02-07 17 108
    2021-02-08 364 423
    2021-02-09 488 448
    2021-02-10 255 503
    2021-02-11 281 345
    2021-02-12 250 248
    2021-02-13 0 88
    2021-02-14 0 78
    2021-02-15 217 262
    2021-02-16 202 287

    The old server getting no traffic on the 13th and 14th is probably because that's the weekend, and the users who happen to be still stuck on the old site aren't using it on the weekend. I asked one of the users still getting the old server to try rebooting, to no effect.

    I thought maybe something was misconfigured with the name servers, but it looks fine:

    $ whois billingadvantage.com \
       | grep 'Name Server'
    Name Server: NS1.ZEROLAG.COM
    Name Server: NS2.ZEROLAG.COM
    
    $ dig notes.billingadvantage.com \
       @ns1.zerolag.com
    notes.billingadvantage.com. 1800
       IN    A    34.199.143.13
    
    $ dig notes.billingadvantage.com \
       @ns2.zerolag.com
    notes.billingadvantage.com. 1800
       IN    A    34.199.143.13
    
    I'm not seeing any references to the old IP address anywhere.

    Any guesses about why the traffic isn't moving over?

    Comment via: facebook, lesswrong

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