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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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Setting DNS TTL for an external address

To start with, I don't know jack about DNS servers. I have been stuck with resolving a problem with a DNS-Server because I discovered a problem with one of our systems and determined that it was caused by the DNS resolution. We use an external web…
JRE
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CDN and TTL on local EC2 files

I Have a file in CDN and I need a local copy of it in all of my EC2 instances. I like to set a TTL on the local copy of 5 minute, and have one of the following: Have it Fetch automatically as soon as the TTL expires. Have it delete automatically,…
mina d
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Change DNS TTL for every records in a zone

I have a forward lookup zone with a lot of A records. If I change the TTL for the zone, it does not apply to records (they keep the previous TTL setting). I have to manually change the TTL for every records. Is it the expected behaviour? How can I…
Patator
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ICMP echo-reply packets with a much lower TTL (-190) than ICMP time-exceeded packets

When I ping the last three hops of a traceroute path to facebook.com from my location, the ICMP echo-reply packets I get back all have a TTL of respectively 58, 57 and 56. The hops in question are the 6th, 7th and 8th hops from my machine. On the…
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Fun this TTLs and many records in PDNS

I got very strange issue for me. I have powerdns server with potentially thousands of cname records. This records inserted to my DNS via mysql queries from network http service. This is a way how I give free jhon_doe.MYHOST.COM domains for my…
Vasiliy Stavenko
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Can't change serials in my SOA without breaking my nameservers

So I was testing my DNS using http://www.intodns.com/mydomain.com And it gave me a warning about the serials of my two nameservers not matching. So I changed the serials to match and restarted bind on both servers. Then it breaks and nothing…
Thuy
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Variable TTL inside a LAN

I recently discovered that ping my local router, returns different TTL values​​. The ping 3 switch must pass through before reaching the router, there may be the problem? 192.168.1.99 is the IP of my router , a Cisco WRT120N Thank you! Respuesta…
tomelin5
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Can I find out whether my DNS provider honor my TTL settting?

Is there any way to determine if my DNS provider actually use the TTL setting I provide?
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BIND result validity

I setup a local name server (BIND on OS-X) and was pleased that 'dig' response times were very short (2nd query onwards). However, if I wait a short period (5s) the response time goes up again - the request is once more being forwarded to the…
William Morris
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Added a third DNS Resolver and pulled a DNS A record... now inaccessible from certain parts of the world?

Here's a step-by-step rundown of my end-of-week nightmare: -Nov 8 @ 2am: One of our two internet providers began experiencing problems. Packets were being dropped and connectivity for our clients (accessing our web services) was being impacted. For…
JohnyD
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Cisco 3560+ipservices -- IGMP snooping issue with TTL=1

I've got a C3560 with Enhanced (IPSERVICES) image, routing multicast between its VLANs with no external multicast router. It's serving a test environment where developers may generate multicast traffic on arbitrary addresses. Everything is working…
Jander
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hightraffic dns ttl record

Whats bestpratice TTL for hightraffic www sites? Should there be a high TTL to make dnsservers around cache longer so the dnsserver wont have to get requests to often?
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ICMP - TTL - Trace Route

I asked this question at Stack Overflow and then thought this may be the better place to ask. Given the following situation: PC --- |aa RTR1 bb| --- |aa RTR2 bb| --- |aa RTR3 bb| etc Each of the |aa rtr bb| is meant to be a router with two ports aa…
dbasnett
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Confused as to why SSL certificate will not install

I am transferring a few websites from Digital Ocean servers to SiteGround. I am confused as to the behavior I am seeing and my understanding of TTL. I have been doing this kind of thing for years (run lots of websites on both DO and SG) and I have…
Katie
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Varnish - How can I set TTL in response header?

I have not tried this before on Varnish. And I must admit that my last experience with Varnish was way back - version 2.1.5 days! I have set varnish 6.x as a simple/basic static http-cache. I have achieved most of what I wish to from this varnish,…
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