Time To Live is a mechanism to prevent messages from traversing the network indefinitely
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How can I solve this error getting the message “TTL expired in transit” when trying to ping to a server in a different network? [duplicate]
Like this:
Reply from 10.0.0.7: TTL expired in transit.
Reply from 10.0.0.7: TTL expired in transit.
Reply from 10.0.0.7: TTL expired in transit.
Reply from 10.0.0.7: TTL expired in transit.
Reply ...
2
votes
5answers
346 views
Generating ICMP packets when TTL=2?
By inspecting the payload of ICMP time-exceeded packets, I noticed that sometimes it is the last but one router (when ttl=2 in the returned packet) or even a previous one(up to 5 hops before, ttl=5) ...
-2
votes
4answers
90 views
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 ...
1
vote
2answers
84 views
Understanding how Tracert works
From what I gathered so far, Tracert works by sending 3 ICMP echo messages. Starting with a TTL value of 1. For each router the packet encounters, the TTL value will be decremented. For the 1st ...
0
votes
1answer
86 views
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 ...
0
votes
2answers
163 views
Optimizing TTL values for DYNDNS service
I've finally gotten my own DYNDNS working but I am looking for some advice on optimizing it.
Edit: Basiclly I got a Domain at a registrar that I point to my own nameservers where I keep my own ...
0
votes
1answer
188 views
TTL and traceroute showing different values for same domain
Why am I getting two different outputs for tracert and ping?
Ping Result showing total hops of 20 and tracert showing 8.
Default ttl value on my Linux machine 64, icmp echo reply ttl value 44.
...
0
votes
1answer
157 views
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 ...
1
vote
0answers
131 views
Squid 3.1: external_acl_type ttl won't work
I have custom script for handling Squid3's external_acl_type and it works fine.
In this script (btw, its PHP) I turned on logging every request into the file.
As far as I know from docs TTL value ...
4
votes
2answers
135 views
Windows Server 2008 R2 DNS - Syncronizing changes to TTL
I apologize if this has been asked. My searches have not been successful.
If I have 2 DNS servers in my Domain and add an A record to 1 server, that record is successfully propagated to the second ...
5
votes
2answers
347 views
My TTL changing over every packetand I don't know why
Recently I discovered that some pings sent to me were giving a TTL error. When someone pings my computer, it shows a different TTL value for every packet.
For example, ping.eu shows that:
--- PING ...
3
votes
1answer
315 views
What DNS Settings to use to migrate Domain from One Server to Another
I am going to migrate a site from one server to another. The site has a good bit of realtime transaction activity reading/writing to a backend database.
I believe I should ratchet down the TTL in the ...
2
votes
2answers
2k views
Varnish Cache - default TTL?
I have discovered that I can set the TTL in Varnish as follows in my VCL file:
sub vcl_fetch {
# 1 minute
set obj.ttl = 1m;
}
But what is the default setting (assuming the backend server is ...
2
votes
2answers
2k views
What are the benefits of a high TTL for DNS?
I'm moving a domain's nameservers from the registrar to dnsmadeasy.com so that we can have automatic failover (among other benefits). When I've done this in the past I simply set the TTL value as low ...
0
votes
2answers
120 views
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?
2
votes
1answer
3k views
Can Windows 2008 R2 DNS set TTL per record?
The DNS Manager administrative tool doesn't seem to have an option for configuring TTL for an individual record. I can set the TTL per-zone by right-clicking -> Properties -> SOA. Where is the ...
7
votes
5answers
488 views
Weighted round robins via TTL - possible?
I currently use DNS round robin for load balancing, which works great.
The records look like this (I have a TTL of 120 seconds)
;; ANSWER SECTION:
orion.2x.to. 116 IN A 80.237.201.41
...
0
votes
3answers
88 views
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 ...
0
votes
1answer
159 views
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 ...
3
votes
2answers
454 views
How network devices affect TTL
When I do a ping, I can see the TTL value for each packet. For every router that I insert in between my computer and the router that connects to the internet, the TTL value goes down by one. However, ...
4
votes
1answer
4k views
What does the TTL on a CNAME record mean?
Due to how many servers are involved in my network, I have a hard time keeping them all organized. Some of them don't have static IP's, so I thought it might be nice if I made a config.mydomain.com ...
0
votes
1answer
791 views
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 ...
6
votes
2answers
2k views
1
vote
2answers
1k views
Differences of the TTL value in Tracert and Ping
When I ping localhost on my Windows XP system, the TTL value returned is 128 and it shows me that the default TTL value in the ping for my system is 128.
Then when I ping google.com the returned TTL ...
1
vote
2answers
194 views
traceroute command details
As I see in wikipedia, traceroute utility sends a sequence of packets using ICMP protocol in groups of three and with incrementing TTL value to identify the network routers. It also says that Internet ...
2
votes
3answers
2k views
Using a low TTL to help prevent extended periods of downtime
Is it feasible to set my domain's TTL to a very low value (a couple of minutes) so that, if my main host goes down for an extended period of time, I can update the DNS records in my main host to point ...
25
votes
4answers
28k views
How can I see Time-to-live (TTL) for a DNS record?
I would like to see the Time-to-live (TTL) value for a CNAME record.
I have access to dig (on Apple Leopard), which gives me an answer like this:
% dig host.example.gov
<*SNIP*>
;; ANSWER ...
0
votes
2answers
797 views
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 ...
1
vote
1answer
168 views
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?
0
votes
4answers
558 views
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 ...
5
votes
2answers
3k views
CNAME and A record have different TTLs. Which one will be cached?
If a CNAME has a TTL of 1 hour that points to an A record with a TTL of 1 minute, will someone who looks up this CNAME have the entire result cached for 1 hour, or will it will keep having to lookup ...
5
votes
1answer
2k views
1
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2answers
275 views
DDNS + DHCPD : Once lease runs out, does DNS entry get removed?
Once there are several hundred adhoc machines being brought up, each with a unique name. Their hostname gets added to the DNS.
Then upon TTL expiring, will the DNS entry still be reachable, or if the ...
10
votes
3answers
3k views
What percentage of nameservers honor TTL these days?
Some years ago I had to do several DNS changes over the course of several weeks as I moved bits of equipment from one data center to the other. At the time that I did this, about 95% of the ...
17
votes
2answers
21k views
Recommended DNS SOA record TTL default?
We currently have our DNS SOA record set to the following for stackoverflow.com:
primary name server = ns1.p19.dynect.net
serial = 2009090909
refresh = 3600 (1 hour)
retry = 600 ...
1
vote
3answers
635 views
What DNS piece of information do I need to change if I'm going to be moving servers soon?
I'm going to be moving servers for our website soon. Instead of having a long period of 'downtime' for clients because their DNS client is caching the entries for a 'long time', can I hint to the DNS ...
2
votes
2answers
1k views
Recommend a content delivery network (CDN) for a specific purpose [closed]
could you please recommend a CDN for the following use:
1) Ability to update files on the edge servers automatically through API, so it should take no more than 5-10 minutes to make a new version of ...
24
votes
7answers
169k views
What does “TTL expired in transit” mean on a ping attempt?
We get the message “TTL expired in transit” when we try to ping to a server in a different network segment. When we run tracert, 4 ip addresses repeat themselves indefinitely:
14 60 ms 59 ms ...
10
votes
6answers
2k views
Recommended DNS TTL
I know it could be very different based on the situation, but for hosting a website with no plans to move the hosting server what is a good TTL to set on the DNS record?
