Time to Live (TTL) is a mechanism to limit the lifetime of data and signal the need to refresh or discard that data. In computer networking it is used to prevent loops. For questions about ping use [ping]. For questions about Trace Route use [traceroute].
Questions tagged [ttl]
10 questions
4
votes
1 answer
What causes the TTL to change while pinging?
I always have a window open running a continuous with ping -t 8.8.8.8.
Many times my TTL changes after awhile and it causes disconnecting and reconnecting of apps and games.
For example my TTL is 117 for one hour and without explanation it changes…
3
votes
1 answer
Implementation differences between NS records and CNAME records for delegating control of a subdomain
I am wanting to control the destination IP address for www.example.com (but not example.com) using DNS and exert the most control over this subdomain TTL as I can since I do not have direct control of the parent domain itself. I am aware of 2…
davidgo
- 73,366
1
vote
2 answers
A Dos attack possibilty using IP Datagram and TTL
So I recently learned about the whole IP Datagram and its headers. We learned about the TTL field that exists because sometimes a packet from a certain network id will be sent to another router, but in the other router it will be sent back to the…
the cool sheep
- 11
- 1
1
vote
1 answer
How do you get the TTL of a record in the DNS cache on Linux using systemd?
I asked this question on how to see the Linux DNS cache. It looks like it's possible but it doesn't show TTL, unlike those for Firefox, Chrome, and Windows.
On windows, this looks like
PS C:\> ipconfig /displaydns
Windows IP Configuration
…
Ross Jacobs
- 189
0
votes
1 answer
How can Wireguard change TTL value?
My ISP sets the incoming packets' TTL such that it is always TTL=1 on my devices (after a router).
They do it so that the end user cannot add another router and re-share the connection. But it also results in me not being able to use internet in…
amin2783
- 3
0
votes
0 answers
TTL of a dynamic arp entry in windows (not base time, actual time)
When I run arp -a on my cmd I get a list of arp entries. The dynamic entries expire when their timer expires and then they are deleted from the arp cache. How can I see how much time a certain entry has left?
I am not talking about the "base…
GalSuchetzky
- 101
- 4
0
votes
0 answers
TTL of a dynamic arp entry in windows
When I run arp -a on my cmd I get a list of arp entries. The dynamic entries expire when their timer expires and then they are deleted from the arp cache. How can I see how much time a certain entry has left?
I am not talking about the "base…
GalSuchetzky
- 101
- 4
0
votes
0 answers
How to set different TTLHOP for TCP ports
We want to set sensitive TCP/UDP Ports at low TTL/HOP Leaving other ttl/hop at 128 default
data center = 3
Priv net = 8
Internet = 128 default
Ssh 22 = 8 (internal hop max)
Rdp 3389 = 8
Http 80 = 128 (internet)
Https 443 = 128
Epmap 135 = 8
MSSQL…
0
votes
1 answer
Unable to connect a TTL to USB converter to a phone
I have been unable to connect the USB side of a TTL-to-USB converter to a phone by using a Female-Female USB A adapter and a normal mobile phone cable (which can handle data).
This is the converter being used
The TTL-to-USB converter has been…
Caspar P
- 3
- 2
-2
votes
1 answer
How do I (permanently) change TTL on an Apple Time Capsule? For Airport on Mac I did it with “sudo sysctl -w net.inet.ip.ttl=65”
On our countryside farm we have only mobile connections. I had to place a mobile router with a SIM card on the roof so I can use internet. But hotspot is limited.
I changed TTL on Mac to avoid tethering (hotspot) detection so I can get full speed…
