All Questions
7
questions
15
votes
5
answers
16k
views
What ports are used by an application [duplicate]
I'm testing an application which opens its own ports (acts as a server for these ports, hence listens at that ports) and where the same application connects to ports bound by other applications (acts ...
- 489
10
votes
1
answer
19k
views
Connection remains flagged as ESTABLISHED even if host is unconnected
I am working on a Linux embedded distribution and I need to monitor incoming and outcoming connections (if they are still actives etc.) and I am experiencing issues because I noticed that, even if the ...
- 253
9
votes
6
answers
18k
views
Why is port 1111 open, and is it safe to be?
I'm new to systems administration and have a server running a website with HTTP (at port 80), HTTPS (at port 443) and SSH (at port 22).
I'm running Ubuntu 11.04.
I did an Nmap port scan using my ...
- 193
4
votes
9
answers
6k
views
How to make Firefox use TCP for DNS
I want to use TCP for DNS, to bypass my ISP's slow and broken DNS servers. I'm not using (and don't want to use) a proxy.
Note: I want to use DNS over TCP because if I use it over udp, no matter what ...
- 436
2
votes
3
answers
4k
views
Meaning of netstat output?
When I type "sudo netstat -an", this is part of the output I get:
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 192.99.202.17:39922 ...
- 69
1
vote
1
answer
1k
views
How can I detect long-lived connections and mark them for shaping
I would like to detect TCP connections which have been open for more than one minute (or for greater than N bytes, or M packets), so I can classify them as bulk traffic ("downloads") and de-prioritise ...
- 1,763
1
vote
2
answers
1k
views
If there are 2 NICs on the same machine, can a TCP client on one NIC connect to a TCP server on the other NIC?
I use TUN/TAP to create a tun NIC tun0 with IP 10.10.10.2, and I have a real NIC eth0 with IP 202.112.34.49
Then I run a TCP client which binds its socket to 202.112.34.49 and a TCP server binding 10....
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