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- networking - Ephemeral port : What is it and what does it do? - Unix . . .
I suddenly came across the term "ephemeral port" in a Linux article that I was reading, but the author did not mention what it is What is an ephemeral port in UNIX?
- How to know the ephemeral port for a service? - Unix Linux Stack Exchange
As for ephemeral ports: The Internet Assigned Numbers Authority (IANA) suggests the range 49152 to 65535 (2 15 +2 14 to 2 16 −1) for dynamic or private ports Many Linux kernels use the port range 32768 to 61000 Looking at the destination on the TCP IP tuple as in the example you ask: udp 0 0 192 168 1 25:41136 61 216 153 106:123 You can see it is the current machine using an NTP service UDP
- How safe is it to change the Linux Ephemeral Port range
So if you change the ephemeral port range such that it overlaps with the Mesos port range, it's likely that some arbitrary process will use an ephemeral port that is actually one of those "Mesos ports"
- Why doesnt Linux use the IANA Ephemeral port range?
However, ephemeral port selection algorithms should use the whole range 1024-65535 " -- It sounds like the value of ip_local_port_range should not be used anyway
- Cmake complaining about a required package was not found
You'll need to complete a few actions and gain 15 reputation points before being able to upvote Upvoting indicates when questions and answers are useful What's reputation and how do I get it? Instead, you can save this post to reference later
- Can a NAT router run out of ports? - Unix Linux Stack Exchange
4 If a router doing NAT uses an ephemeral port for each connection made to the internet on behalf of the hosts on the internal network, does this mean that it is possible for the router to run out of ports? Theoretically, but unlikely NAT (usually) works on a mapping of the tuple { source IP, destination IP, source port, destination port }
- How to limit range of random port sockets? - Unix Linux Stack Exchange
There's a binary that I need to run which uses bind with a port argument of zero, to get a random free port from the system Is there a way I can constrain the range of ports the kernel is allowed to
- How to avoid allowing ephemeral port range rule in nftables
I am using Ubuntu 20 04 OS with dnsjava client library to query DNS servers I have nftables rule in this machine which block all traffic on ports except ephemeral port range 32768-61000 which will
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