All Questions
50
questions
3
votes
2
answers
2k
views
Are FIN packets guaranteed to arrive?
In the 4-way handshake, we have the following:
FIN ------->
<------- ACK
<---x--- FIN (what if this packet is lost?)
ACK ------->
What happens if the third packet is lost, will it be re-...
- 31
0
votes
1
answer
2k
views
List all open sockets in /dev/tcp/localhost/
Is it possible to list all open sockets in /dev/tcp/localhost/ on a Linux machine?
I want to list all sockets where the following command would return 0:
timeout 2 bash -c "cat < /dev/null > /...
- 127
0
votes
0
answers
16
views
What happens when I terminate a process and the socket send buffer is not empty? [duplicate]
In Windows (and probably in other operating systems), if a process has a TCP connection with another process on another machine, and then I terminate the process, an RST packet will be sent to the ...
user4579580
4
votes
1
answer
929
views
What happens when I terminate a process and the socket send buffer is not empty?
In Windows (and probably in other operating systems), if a process has a TCP connection with another process on another machine, and then I terminate the process, an RST packet will be sent to the ...
- 41
0
votes
3
answers
1k
views
What happens when 2 hosts simultaneous establish a connection in a 3-way handshake
Say two hosts, A and B, both attempt to start a connection with each other, but the SYN from A gets to B before B's SYN arrives at A.
My answer is that A would sent SYN ACK and would ignore the SYN ...
- 900
3
votes
1
answer
3k
views
Does an open TCP socket connection consume data when not used?
I have a TCP socket connection established between my server and a modem which has a active GSM module and sim card installed.
I create this wirless 3G connection via socat:
/usr/bin/socat open:/dev/...
- 145
1
vote
1
answer
1k
views
Linux Kernel TCP socket functions
So I have been looking through the Linux Kernel v3.8.0-19-generic source code and I noticed that the proto struct, whose members are virtual functions for socket operations depending on the particular ...
- 215
3
votes
1
answer
6k
views
SYN-ACK not received
On a standard TCP connection between server and client, I have this issue: the SYN-ACK is not received from the client, while it is sent from the server. I could see this on Wireshark from both server ...
- 131
1
vote
1
answer
166
views
Why is it possible to continue working in a ssh session after a network disruption?
What enables the Secure Shell client and server to resume communication after one or several network interfaces in the communication path between them is shut down and re-appears some moments later? ...
- 11.4k
2
votes
1
answer
4k
views
How to Maintain an Inactive Tcp Connection?
If a TCP server establishes a TCP connection with a TCP client and the TCP client never sends any packet to the server.
I roughly know firewalls near the TCP server may send an RST to it. Or there is ...
- 3,055
1
vote
1
answer
654
views
TCP vs UDP Error-Checking
I've bounced upon two articles that describe in-depth on how TCP and UDP connections work. However there is some kind of inconsistency. Where one article tells me that UDP does no Error-Checking at ...
4
votes
2
answers
18k
views
TCP: Maximum number of connections (client and server)
In the description of TCP in the Wikipedia, it is stated that
The number of sessions in the server side is limited only by memory and can grow as new connections arrive, but the client must ...
- 1,311
1
vote
1
answer
1k
views
ARP: 'Who has' broadcast resulting in TCP segment losses
I have an issue with a simple TCP connection between two PCs (both Windows XP SP3) connected by direct wire to each other. These PCs have IP address 10.10.10.1 (server) and 10.10.10.2 on the network ...
- 83
5
votes
1
answer
1k
views
Does TCP/UDP send file sequentially or randomnly?
Does TCP/UDP protocol always send or receive file packets sequentially? Would it possible to make a choice which data packets will be sent first using sockets API?
- 53
1
vote
1
answer
1k
views
Sending a file via TCP/UDP socket
I'm reading about TCP and UDP from a article. In the end what I understood is that UDP is faster than TCP but it is unreliable. So if I'm going to a send a file, If use UDP, would it
be faster than ...
- 13