The tcp tag has no wiki summary.
3
votes
4answers
198 views
Logging outgoing connections as they happen
Is there a way to log to file all the outgoing connections that a process creates? I am aware of Netstat but that seems to be more of a snapshot of a point in time rather than something that runs and ...
5
votes
1answer
430 views
How can I configure a reverse SSH connection to the connecting computer?
I'm going to be deploying a number of machines in the near future which will be behind routers. It won't be feasible to set up dynamic DNS on each router and port forwarding, so is there a way I can ...
2
votes
3answers
54 views
How can I read lines at a fixed speed?
I need to read a large log file and send it over a local network using (netbsd) netcat between two VMs on the same host workstation.
I know that netcat has an interval, but as far as I can tell, the ...
1
vote
0answers
105 views
Port Mirroring in Fedora?
I have set up an application that listens constantly to a port for network packets, and I would like to create another one that receives the same network packets ( for use as a test bed). Getting the ...
9
votes
5answers
3k views
Linux: allowing an user to listen to a port below 1024
I need to allow an user (different from root) to run a server listening on port 80.
Is there any way to do this?
7
votes
1answer
218 views
what level of the network stack does tcpdump get its info from?
As I was trying in vain to fix a faulty ethernet controller here, one thing I tried was running tcpdump on the machine.
I found it interesting that tcpdump was able to detect that some of the ICMP ...
6
votes
1answer
460 views
Why are the first 1024 ports restricted to the root user only?
This is more idle curiosity than anything else. A friend of mine asked me 'which port range is it that only root can use under Linux?' I told him 0-1024 were restricted. Then he asked my why it was so ...
4
votes
1answer
368 views
How does tcp-keepalive work in ssh?
I am trying to code a shell-script that uses a ssh-connection for doing "heartbeats". I want to terminate the client- and server-side of that connection after a certain timeout (after the connection ...
