All Questions
9
questions
1
vote
0
answers
623
views
Cannot receive UDP Broadcasts from different subnet addresses
I have setup an independent network (that is not connected to any other devices) with four devices each of which are on a slightly different subnet. There is just a hub with the four devices connected ...
- 111
0
votes
0
answers
794
views
Null Supervisory, Receiver not Ready on WiFi network: what does it mean?
When sniffing with tcpdump on my home network with a Debian box I get broadcast packets like this one within minutes from WiFi devices:
11:03:06.976812 34:8a:7b:d9:6c:64 > ff:ff:ff:ff:ff:ff Null ...
- 273
0
votes
1
answer
308
views
Receive UDP packets from multiple broadcast servers
I have two sensors which broadcast their data using UDP. I configured them to use different ports.
If I connect only one sensor, I receive the packets using nc -ul port without any trouble.
If I ...
- 101
2
votes
0
answers
944
views
Disable terminal broadcast messages in Linux
I am relatively new user to Linux on the desktop and have recently started to connect to several work/personal VPNs using the following command:
sudo systemctl start openvpn-client@Personal
This all ...
- 121
2
votes
0
answers
754
views
Directed broadcasts to other than own IP subnet are received until socket shutdown - why?
My two hosts reside on the same Ethernet segment. Host A is 10.1.0.1/16, host B is 10.1.0.2/16. A sends directed UDP broadcasts to 10.1.255.255 and a UDP listening socket bound to INADDR_ANY on B ...
0
votes
2
answers
930
views
Remote shutdown of a group of linux servers (SNMP/Bonjour/socat?)
I have a group of linux servers on my subnet that I want to be able to remotely shutdown from a master machine. I don't want the non-master machines to have to coordinate with the master in advance, i....
- 152
0
votes
1
answer
866
views
Hacked ubuntu pc? Broadcast messages
I have a fresh ubuntu 13 os installed on my system with almost default programs installed. But whenever I shutdown my pc i got these messages.
Broadcast from root@..
(Unknown) at ...
The system is ...
2
votes
0
answers
301
views
How to use a key binding within shell script ? (Launch terminator in broadcast mode in background)
I currently use a small shell script to start a terminator window as a background process which has multiple splits specified with a layout.
terminator --layout=My_layout &
I want to execute a ...
- 1,092
15
votes
1
answer
20k
views
What is ICMP broadcast good for?
To configure Linux to ignore ICMP broadcasts (to protect from SMURF attacks), I have added the following line to /etc/sysctl.conf:
net.ipv4.icmp_echo_ignore_broadcasts = 1
Anyone knows what are the ...
- 153