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Top Forums UNIX for Advanced & Expert Users Changing hosting company for one domain, how to deal with DNS? Post 303043359 by Neo on Sunday 26th of January 2020 03:55:18 AM
Old 01-26-2020
Hmmmm. 3600 is a very long time (for cutovers and changes to the network) and not really acceptable for transitions.

Plus, I'm not sure I trust this $TTL 3600 in your output.

Code:
172800          ; TTL

For your cached DNS entries, you can check the TTL as follows, as you provably know:

Code:
macos# nslookup
> set debug
> server ns1.linode.com
Default server: ns1.linode.com
Address: 162.159.27.72#53
> www.unix.com
Server:		ns1.linode.com
Address:	162.159.27.72#53

------------
    QUESTIONS:
	www.unix.com, type = A, class = IN
    ANSWERS:
    ->  www.unix.com
	internet address = 209.126.104.117
	ttl = 3600
    AUTHORITY RECORDS:
    ->  unix.com
	nameserver = ns2.linode.com.
	ttl = 3600
    ->  unix.com
	nameserver = ns1.linode.com.
	ttl = 3600
    ->  unix.com
	nameserver = ns3.linode.com.
	ttl = 3600
    ->  unix.com
	nameserver = ns5.linode.com.
	ttl = 3600
    ->  unix.com
	nameserver = ns4.linode.com.
	ttl = 3600
    ADDITIONAL RECORDS:
    ->  ns1.linode.com
	internet address = 162.159.27.72
	ttl = 300
    ->  ns1.linode.com
	has AAAA address 2400:cb00:2049:1::a29f:1a63
	ttl = 300
    ->  ns2.linode.com
	internet address = 162.159.24.39
	ttl = 300
    ->  ns2.linode.com
	has AAAA address 2400:cb00:2049:1::a29f:1827
	ttl = 300
    ->  ns3.linode.com
	internet address = 162.159.25.129
	ttl = 300
    ->  ns3.linode.com
	has AAAA address 2400:cb00:2049:1::a29f:1981
	ttl = 300
    ->  ns4.linode.com
	internet address = 162.159.26.99
	ttl = 300
    ->  ns4.linode.com
	has AAAA address 2400:cb00:2049:1::a29f:1b48
	ttl = 300
    ->  ns5.linode.com
	internet address = 162.159.24.25
	ttl = 300
    ->  ns5.linode.com
	has AAAA address 2400:cb00:2049:1::a29f:1819
	ttl = 300
------------
Name:	www.unix.com
Address: 209.126.104.117


And the query above confirms what is in our DNS setup:

Changing hosting company for one domain, how to deal with DNS?-screen-shot-2020-01-26-34730-pmjpg


As you can see from the next screen capture, I would set this to 5 minutes (300 seconds) if I was going to do a cut-over. I would never do a cutover with 1 hour (3600 second) TTL. This would be a receipt for a small disaster.

Changing hosting company for one domain, how to deal with DNS?-screen-shot-2020-01-26-35004-pmjpg


I suggest you check with a DNS tool (like I did above) to make sure your TTL is what you think it is.

Personally, I would not use any DNS provider which provides a minimum TTL of 1 hour. Actually, for me, that is "unheard of" for 3600 to be "the minimum", as the minimum TTL is normally 300 seconds, like I have demonstrated to you above.
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