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Questions tagged [ttl]

Time To Live is a mechanism to prevent messages from traversing the network indefinitely

Every IP packet has a Time To Live, it is a counter that gets deducted when it passes a router. It prevents a packet from traversing the network endlessly. If the packets TTL reaches 0 it gets discarded. TTL can be a timestamp or a counter.

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recommended TTLs during Zone transfer

I'm working on transferring zones from DynDNS to Route53, any suggestion on what the TTLs (SOA and NS records) should be - during this transition period (i.e. before/when I update the registrar to point to Route53 instead of DynDNS) ? according to…
Mahyar
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TTL/UART communication issue

I have (an awesome) Onion Omega2+ SBC and an A9G GPS/GSM module. The module has two UART ports. I can easily read data from the UART_GPS but for some reason I cannot communicate with the UART port for the GSM chip. When I connect it to my Mac…
Radek Suski
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Understanding TTL field of PTR record returned by dig client

I have some doubts about working of DNS in general - even given the fact I have theoretical base. let's consider a following output: [user@host ~]$ dig google.com [...] ;; ANSWER SECTION: google.com. 102 IN A 172.217.3.174 [user@host ~]$…
DNS question
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It's possible overwrite DNS TTL with nginx headers?

My DNS provider doesn't allow me to set a custom TTL. All my domains have a 300 (5 minutes) TTL, that is terrible low. Can I send to browser a header from nginx with a custom TTL time to overwrite domain TTL? Thanks!
Lito
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How do I change the TTL of my DNS?

I'm using Linux DNS and I'm not sure which row I should change if I want to change the TTL of my dns.. This is the TTL part: $ORIGIN biz. $TTL 3600 sop1 IN SOA ns1.mydomain.net. hostmaster.mydomain.net. ( …
Shlomi
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OS Fingerprinting, TTL=56?

I am just learning about OS fingerprinting, when i ping a certain ip address, it gives me a ttl value of 56. What is an operating system with a value of 56? I only know about the popular operating system's ttl value such as; 128 for windows xp, 64…
Adam
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TTL in ping vs dig

When I ran ping google.com, I get a ttl value of 55: 64 bytes from 173.194.127.103: icmp_seq=68 ttl=55 time=16.4 ms When I ran dig google.com @ns1.google.com., it get a TTL value of 300. google.com. 300 IN A 173.194.127.34 Why do I get two…
dayuloli
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TTL on DNS for domains as a security measure

Ever since I read this article the other day, I've felt a bit uncomfortable about my domains being stolen. And I've tried taking each measure possible. But one I don't understand completely is…
TimePatrol
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DNS TTL problem

So I have an external network card and an internal NIC on my windows 2008 R2 server. When I try to connect to some websites, i get a timeout which is a TTL problem. It goes away when i disable the internal NIC or disable RRAS, but i dont want to do…
SantaC
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Why aren't my name servers updating?

I have had hundreds of domains over the years, and generally, the 24 to 48 hour rule applies. Sometimes even much quicker. I've learned that the registrar you use affects it a lot. GoDaddy usually takes minutes, whereas hostgator generally takes 24…
Donald Faulknor
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Reducing TTL in DNS

What stops us from reducing the TTL of all DNS entries to 1 minute or something less? If that is done we won't have to wait mych for DNS changes to propagate so what all things force us to not do it.
Abhijeet Rastogi
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