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- 03-06-2014 #1
Where to decrease TTL value on linux?
I will need to switch server to another location, IP so i need to modiffy nameservers i registered in my domain registar. (change ip there)
so i need to minimise downtime of domain/website files.
People say i need to decrease TTL and make change?
- 03-06-2014 #2
- Join Date
- Dec 2013
- Victoria, B.C. Canada
You can change the value at /proc/sys/net/ipv4/ip_default_ttl
It will probably be 64 which is generally considered a good value to use. Remember to put it back.
- 03-06-2014 #3
From previous posts, I know that it is not the tcp ttl, but ttl for a dns zone.
And as I explained: This needs to be set in zone files of the dnservers, which are probably changeable via an admin webgui of your ISP.You must always face the curtain with a bow.
- 03-06-2014 #4
My VPS /proc folder is empty, so you mean i cant help myself setting it on VPS, but changing it on domain registar well ahead of time (like 48 hours) before i modiffy my registered nameservers on domain registar? So when they are changed the website visitors ISP nameservers have low ttl value cached so they optain new VPS IP more quickly?
- 03-06-2014 #5
Basically yes, but be careful with the assumption of 48h.
This depends on the *current* value of the ttl, as well as some caching effects on top.
For background information, I suggest to read the RFCs:
RFC 1034 - Domain names - concepts and facilities
RFC 1035 - Domain names - implementation and specification
RFC 2181 - Clarifications to the DNS SpecificationYou must always face the curtain with a bow.