What happens to a TCP connection when the network is abruptly terminated
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Say a user space application has a TCP connection with some non local endpoint. At some point, network gets abruptly broken (i.e. connection deleted in network manager, unplug the wifi dongle, cut the Ethernet cable)
What is conceptually happening inside the kernel to cope with the situation and how does it manifest itself to the userspace application?
Guideline sub-questions:
- what are the timeouts involved?
- will the kernel try to hide from userspace the connection is lost while attempting to reconnect?
- can waiting for a response cause the userspace app to not want to quit gracefully?
linux networking linux-kernel tcp
asked Dec 5 at 10:10
TheMeaningfulEngineer
1,63863569
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up vote
1
down vote
favorite
1
Say a user space application has a TCP connection with some non local endpoint. At some point, network gets abruptly broken (i.e. connection deleted in network manager, unplug the wifi dongle, cut the Ethernet cable)
What is conceptually happening inside the kernel to cope with the situation and how does it manifest itself to the userspace application?
Guideline sub-questions:
- what are the timeouts involved?
- will the kernel try to hide from userspace the connection is lost while attempting to reconnect?
- can waiting for a response cause the userspace app to not want to quit gracefully?
linux networking linux-kernel tcp
asked Dec 5 at 10:10
TheMeaningfulEngineer
1,63863569
There has been a close vote for the question being off topic without a comment what particularity. As I see it the question addressed two topic points.Using or administering a *nix desktop or serverandUNIX C API and System Interfaces. Would therefore ask for a comment on the closed vote please.
– TheMeaningfulEngineer
Dec 5 at 13:38
I personally voted to leave this open; one vote currently says "too broad" while the other thinks it's a request for learning materials. Since I didn't cast those votes, I can't speak to them.
– Jeff Schaller
Dec 5 at 15:50
The network interface or other infrastructure going down does not mean the “connection is lost”. TCP will keep trying to retransmit for a long time before killing the connection (9 minutes?). It’s not up to the kernel it is the TCP protocol and the “userspace app” could very well wait until the connection is dropped before exiting.
– Murray Jensen
Dec 8 at 5:23
add a comment |
up vote
1
down vote
favorite
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up vote
1
down vote
favorite
1
1
Say a user space application has a TCP connection with some non local endpoint. At some point, network gets abruptly broken (i.e. connection deleted in network manager, unplug the wifi dongle, cut the Ethernet cable)
What is conceptually happening inside the kernel to cope with the situation and how does it manifest itself to the userspace application?
Guideline sub-questions:
- what are the timeouts involved?
- will the kernel try to hide from userspace the connection is lost while attempting to reconnect?
- can waiting for a response cause the userspace app to not want to quit gracefully?
linux networking linux-kernel tcp
asked Dec 5 at 10:10
TheMeaningfulEngineer
1,63863569
Say a user space application has a TCP connection with some non local endpoint. At some point, network gets abruptly broken (i.e. connection deleted in network manager, unplug the wifi dongle, cut the Ethernet cable)
What is conceptually happening inside the kernel to cope with the situation and how does it manifest itself to the userspace application?
Guideline sub-questions:
- what are the timeouts involved?
- will the kernel try to hide from userspace the connection is lost while attempting to reconnect?
- can waiting for a response cause the userspace app to not want to quit gracefully?
linux networking linux-kernel tcp
linux networking linux-kernel tcp
asked Dec 5 at 10:10
TheMeaningfulEngineer
1,63863569
asked Dec 5 at 10:10
TheMeaningfulEngineer
1,63863569
asked Dec 5 at 10:10
TheMeaningfulEngineer
1,63863569
asked Dec 5 at 10:10
TheMeaningfulEngineer
1,63863569
asked Dec 5 at 10:10
TheMeaningfulEngineer
1,63863569
1,63863569
There has been a close vote for the question being off topic without a comment what particularity. As I see it the question addressed two topic points.Using or administering a *nix desktop or serverandUNIX C API and System Interfaces. Would therefore ask for a comment on the closed vote please.
– TheMeaningfulEngineer
Dec 5 at 13:38
I personally voted to leave this open; one vote currently says "too broad" while the other thinks it's a request for learning materials. Since I didn't cast those votes, I can't speak to them.
– Jeff Schaller
Dec 5 at 15:50
The network interface or other infrastructure going down does not mean the “connection is lost”. TCP will keep trying to retransmit for a long time before killing the connection (9 minutes?). It’s not up to the kernel it is the TCP protocol and the “userspace app” could very well wait until the connection is dropped before exiting.
– Murray Jensen
Dec 8 at 5:23
add a comment |
There has been a close vote for the question being off topic without a comment what particularity. As I see it the question addressed two topic points.Using or administering a *nix desktop or serverandUNIX C API and System Interfaces. Would therefore ask for a comment on the closed vote please.
– TheMeaningfulEngineer
Dec 5 at 13:38
I personally voted to leave this open; one vote currently says "too broad" while the other thinks it's a request for learning materials. Since I didn't cast those votes, I can't speak to them.
– Jeff Schaller
Dec 5 at 15:50
The network interface or other infrastructure going down does not mean the “connection is lost”. TCP will keep trying to retransmit for a long time before killing the connection (9 minutes?). It’s not up to the kernel it is the TCP protocol and the “userspace app” could very well wait until the connection is dropped before exiting.
– Murray Jensen
Dec 8 at 5:23
There has been a close vote for the question being off topic without a comment what particularity. As I see it the question addressed two topic points.
Using or administering a *nix desktop or server and UNIX C API and System Interfaces. Would therefore ask for a comment on the closed vote please.– TheMeaningfulEngineer
Dec 5 at 13:38
There has been a close vote for the question being off topic without a comment what particularity. As I see it the question addressed two topic points.
Using or administering a *nix desktop or server and UNIX C API and System Interfaces. Would therefore ask for a comment on the closed vote please.– TheMeaningfulEngineer
Dec 5 at 13:38
I personally voted to leave this open; one vote currently says "too broad" while the other thinks it's a request for learning materials. Since I didn't cast those votes, I can't speak to them.
– Jeff Schaller
Dec 5 at 15:50
I personally voted to leave this open; one vote currently says "too broad" while the other thinks it's a request for learning materials. Since I didn't cast those votes, I can't speak to them.
– Jeff Schaller
Dec 5 at 15:50
The network interface or other infrastructure going down does not mean the “connection is lost”. TCP will keep trying to retransmit for a long time before killing the connection (9 minutes?). It’s not up to the kernel it is the TCP protocol and the “userspace app” could very well wait until the connection is dropped before exiting.
– Murray Jensen
Dec 8 at 5:23
The network interface or other infrastructure going down does not mean the “connection is lost”. TCP will keep trying to retransmit for a long time before killing the connection (9 minutes?). It’s not up to the kernel it is the TCP protocol and the “userspace app” could very well wait until the connection is dropped before exiting.
– Murray Jensen
Dec 8 at 5:23
add a comment |
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There has been a close vote for the question being off topic without a comment what particularity. As I see it the question addressed two topic points.
Using or administering a *nix desktop or serverandUNIX C API and System Interfaces. Would therefore ask for a comment on the closed vote please.– TheMeaningfulEngineer
Dec 5 at 13:38
I personally voted to leave this open; one vote currently says "too broad" while the other thinks it's a request for learning materials. Since I didn't cast those votes, I can't speak to them.
– Jeff Schaller
Dec 5 at 15:50
The network interface or other infrastructure going down does not mean the “connection is lost”. TCP will keep trying to retransmit for a long time before killing the connection (9 minutes?). It’s not up to the kernel it is the TCP protocol and the “userspace app” could very well wait until the connection is dropped before exiting.
– Murray Jensen
Dec 8 at 5:23