Questions tagged [protocols]
Tag for questions related to data transmission rule sets.
50
questions
2
votes
2
answers
330
views
difference NFS proto and mountproto
in RHEL 8.8 when I am trying to test NFS tcp versus udp and versions 3 versus 4.0, 4.1 and 4.2, I observe on my nfs client a mountproto= in addition to proto= when typing mount. What is the ...
- 5,776
0
votes
2
answers
44
views
How does ftpd service access the FTP protocol to understand how to transfer files?
This question applies not only to the FTP protocol, but also to other protocols in general.
We call FTP a protocol, but speaking literally, FTP has a source code. When an ftpd service is running on a ...
- 1
0
votes
1
answer
116
views
How to use the command line to get a list of peers from a BitTorrent tracker
Given that I have the infohash of a torrent and the URL of a BitTorrent tracker (e.g. udp://tracker.example.com/announce), how do I use the command line to get all the IP addresses of peers that the ...
- 2,536
2
votes
1
answer
224
views
System with serial console, which system is responsible for flow control settings
I have a proprietary Linux system, with a proprietary init system, which uses a serial console. I lately noticed, that the xon/xoff flow control is active on this serial console, which poses the risk ...
- 121
2
votes
1
answer
868
views
What is the significance of /etc/protocols in Linux?
What is the use case and usage of /etc/protocols?
I can see it lists the number of protocols available. But what is the significance?
For example, my Linux machine is not running OSPF but I see OSPF ...
2
votes
3
answers
3k
views
Samba has a module vfs_full_audit, what does each object actually mean within the module?
The module vfs_full_audit in Samba lists objects that can be added to the module to increase the logging specificity or verbosity generally of syscalls. Example:
# defaults for auditing
full_audit:...
- 41
1
vote
0
answers
469
views
Custom linux driver for custom Layer 3 protocol
We're designing a custom communication using a custom physical layer which will be used in a cubesat and I'm looking on how to create the custom layer 3 driver for linux (like ipv4 but not, the ...
- 11
0
votes
0
answers
30
views
Alternative to SSH and SNMP for remotely gathering metrics
Does anyone know of alternative protocols for gathering metrics remotely from Linux servers other than SSH and SNMP? We are looking to support as much of the Linux ecosystem as possible including very ...
- 1
0
votes
1
answer
188
views
Transfer files between two Ubuntu machines over ftp
I wonder how I can transfer files between two machines running ubuntu using FTP? Also what is the best fastest configurations to transfer files over ubuntu (cifs, smb, ftp,...)? Also is it worth it to ...
- 519
0
votes
0
answers
412
views
Why do I get FTP "protocol not available" error?
I have been trying to install Centos 8 on my other Virtual Box - Virtual Machine via the kickstart unattended installation.
But I cannot complete the installation because of the below FTP error.
ftp: ...
- 101
2
votes
1
answer
7k
views
ssh-add not able to connect to ssh-agent
I know that ssh-add is "front-end" of ssh-agent.
But ssh-agent on my computer is already running (I could find it in top). When I type ssh-add, it said "Could not open a connection to ...
- 23
0
votes
1
answer
1k
views
Pulseaudio: module-simple-protocol not listening
I did the following:
$ pactl list sources short | grep "analog-stereo.monitor"
0 alsa_output.pci-0000_00_1b.0.analog-stereo.monitor module-alsa-card.c s16le 2ch 44100Hz SUSPENDED
...
- 1,690
0
votes
1
answer
183
views
How to fix browser unsecure icon for given apache config?
Team,
While configure ssl.conf for apache 2.2.4, I want to use some configuration like below
SSLEngine on
SSLCertificateFile /opt/alfresco/deploy/ssl/crt/testdns.com.crt
SSLCertificateKeyFile /...
1
vote
0
answers
121
views
Does rootless Podman support varlink?
I'm currently taking a look at a bunch of stuff with PodMan. One feature that I'd like is to be able to remotely interact with my pods—start and stop them from some other service.
I saw the Varlink ...
- 111
12
votes
5
answers
6k
views
Why telnet is considered to be a protocol? Isn't it just a simple TCP send/echo program?
This is more like a conceptual question. I need some clarifications.
Today I was learning some socket programming stuff and wrote a simple chat server and chat client based on Beej's Guide to Network ...
- 1,107
22
votes
1
answer
2k
views
Why do popular TCP-using services have UDP as well as TCP entries in /etc/services?
I'm reading a book on network programming with Go. One of the chapters deals with the /etc/services file. Something I noticed while exploring this file is that certain popular entries like HTTP and ...
- 343
0
votes
2
answers
5k
views
How can I receive an xmodem file using command line?
I'm using Putty or Picocom to talk directly to a Mobile Modem using AT commands, while doing some experiments that require up/downloading some files on the mobile module's EFS partition. The protocol ...
- 1,588
0
votes
1
answer
174
views
is there a standard seperating character for commands in SSH protocols?
In command or RPC protocols that are written with SSH as the transport medium, is there a standard seperating character that the SSH server uses to parse commands?
For example, if we have a simple ...
- 227
1
vote
2
answers
328
views
Must an application-layer protocol exist for communication between any two programs using sockets?
When any two programs, no matter how simple or complicated, communicate by internet domain sockets (or Unix domain sockets), does it necessarily imply that there is an application-layer protocol ...
- 98.9k
3
votes
2
answers
471
views
Can we specify service name and transport protocol in a URL?
A URL has its own syntax.
In a URL, we can specify either hostname or IP address. Similarly, while we can specify port number, can we specify service name instead of port number ?
If we can't, how ...
- 98.9k
14
votes
1
answer
53k
views
SMB protocol min max values available?
I am running Samba 3.6 in SLES 11.4. I recently added in /etc/samba/smb.conf in the [global] section the following
min protocol = SMB2
max protocol = SMB2
this was done to allow communication with ...
- 5,776
3
votes
0
answers
977
views
Bluetooth over serial (SPP) configuration and setup
I have an embedded board with an onboard bluetooth capability. My board runs Linux with bluetooth support provided by the BlueZ stack. I have access to all the bluez utils like hciconfig, sdptool, ...
- 151
1
vote
0
answers
182
views
NFS protocol problem [duplicate]
I tried to configure a NFS server with my Red Pitaya board, with a custom Ubuntu image, exactly as this page tells me to https://www.digitalocean.com/community/tutorials/how-to-set-up-an-nfs-mount-on-...
- 11
1
vote
2
answers
2k
views
Is value of bInterfaceProtocol fixed or decided by Kernel?
Let's say:
$ ls -l /dev/input/by-id
lrwxrwxrwx 1 root root 10 Feb 10 03:47 usb-Logitech_USB_Keyboard-event-if01 -> ../event22
lrwxrwxrwx 1 root root 10 Feb 10 03:47 usb-Logitech_USB_Keyboard-event-...
- 4,966
1
vote
1
answer
2k
views
What is the relation between UART and the tty?
When I write programs for my own FPGA, I must select UART to emulate a terminal and for my FPGA design but I don't know exactly what that means.
I believe that UART is a basic serial transmission ...
- 4,112
0
votes
1
answer
138
views
Which port is used for receiving email?Is it the same port for sending email SMTP (25)? [closed]
I just noticed my ISP blocked both direction for port 25. Does that mean port 25 is for both sending or receiving email? Used to think it is for sending only.
- 293
0
votes
1
answer
4k
views
iptables - how to drop protocols [closed]
I have the desktop-server Debian Jessie machine running for testing purposes just for 19 hours now. I have already set a few rules as you can see above. But I am not really into networking. So it ...
- 27.8k
24
votes
8
answers
32k
views
command-line tool for a single download of a torrent (like wget or curl)
I'm interested in a single command that would download the contents of a torrent (and perhaps participate as a seed following the download, until I stop it).
Usually, there is a torrent-client daemon ...
2
votes
1
answer
4k
views
how to know on my linux machine if connection VIA sftp is active
I have Linux machine red-hat 5.X
please advice - which what command I can identify if someone is tiring to
copy files from my machine VIA sftp or ftp
is it possible to verify this on my Linux machine ...
- 7,001
1
vote
0
answers
194
views
Is legacy checkpoint endpoint blocking puppy 528 wireless Internet connection and how can I remove it?
Background: Whilst booting with an old flash drive (SafeXs by block master) plugged in to my laptop (DELL latitude 6430u) I came up against a blue login screen . At full encryption point ... ...
- 11
2
votes
1
answer
2k
views
Where do I find the OID descriptions for SNMPv2 in Linux?
I was looking at this link here: http://www.debianadmin.com/linux-snmp-oids-for-cpumemory-and-disk-statistics.html and noticed that the OIDs are the same ones I see for the same stats for our ...
- 2,725
32
votes
1
answer
11k
views
In what sense does SATA "talk" SCSI? How much is shared between SCSI and ATA?
This is nothing new to me at least, that SATA actually "talks" SCSI, hence why these SATA devices show up as SCSI devices in Linux.
A related question has been asked before, e.g. Why do my SATA ...
2
votes
0
answers
447
views
Chat application for monitoring with scripts
I am looking for a chat application, which would have the ability to interact with a shell script. I need this for a home project.
An example of usage: A client sends a chat message to a server. It ...
- 21
10
votes
3
answers
25k
views
Why does SSH show protocol as tcp6 *and* tcp in netstat?
$ netstat -nat
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:80 0.0.0.0:...
- 1,559
22
votes
3
answers
27k
views
What network protocols does a Postgres database server use?
I have a postgres 9.1 server running on the default port 5432 on an Ubuntu 12.04 cloud server.
I want to open up the port, so I can make remote queries -- but I have to open the port on IP tables, ...
- 6,535
2
votes
1
answer
283
views
Are application layer protocols part of library routines?
Where do application layer protocols reside? Are they part of library routines of language e.g. C, C++, Java?
As goldilocks says in his answer, this is about the implementation of application layer ...
- 1,422
2
votes
1
answer
4k
views
How to tell what wireless protocols my network card is using?
I want to know which wireless protocol my card is currently using. I found a similar question that tells you what network protocol your card supports, but I want to confirm that my card is actually ...
- 815
0
votes
1
answer
71
views
IP Prefix - how do I declare this?
Hi I have an IP Prefix issue I would like to declare the following IP's as "safe" using ip prefix "methodology" ("?")
The IP's first three parts of the IP have been doctored to protect the innocent, ...
- 15
2
votes
1
answer
2k
views
How to enable NFS4 protocol
I have found nothing that could help me with enabling NSF4 protocol
rpcinfo -u localhost nfs
program 100003 version 2 ready and waiting
program 100003 version 3 ready and waiting
How can I add ...
- 2,820
5
votes
1
answer
2k
views
Why Linux syslog file does not follow the RFC3339 protocol?
Why Linux syslog file: /var/log/syslog does not follow the timestamp format defined in the protocol https://www.rfc-editor.org/rfc/rfc5424#page-11?
5
votes
1
answer
399
views
Does the X windowing system suffer from scalability?
One of my professors was telling us about scalability problems, and said that the X protocol was a prime example of a not scalable protocol. Why is that? Is it because it is very hardware dependent? I ...
- 183
3
votes
2
answers
2k
views
IM program to support yahoo video calls
I have been trying to migrate to Linux from Windows during the past one year. Until I completely deleted my windows and I have been using Linux mint 15 for the last 30 days. I am really satisfied.
I ...
- 171
1
vote
2
answers
4k
views
Why TCP TIME-WAIT State is present at both ends after a connection termination?
I am reading how the TCP states work and especially the connection termination part.
All of the books or online material I read, shows that for the termination procedure these states are followed ...
- 1,647
4
votes
1
answer
1k
views
Using xdg-open for accessing network with normal explorer
I'm working with small network and I want to start network explorer from a terminal. When I tried to type xdg-open network:///server it opened google chrome and did nothing. I also tried to type smb://...
- 429
12
votes
3
answers
9k
views
mounting dropbox (for exploring the files)
I want to simply be able to explore a dropbox filesystem, without much additional load on CPU, memory, storage (i.e., without saving copies of the remote files locally). It seems that the official ...
5
votes
1
answer
2k
views
Debian Kde Iceweasel/Firefox: setting custom protocols handlers
I recently switched from Ubuntu 10.04 gnome to Debian wheezy Kde.
Everything's work fine, except to the Iceweasel/firefox custom protocols!
I added komodo.protocol in my ~/.kde/share/services with:
...
- 233
2
votes
2
answers
932
views
I would like to send commands and requests from a client side app to a Linux server
So I am planning/designing an app running on Mac that will send commands and make data requests to a linux server. Some of the things I would need to do will be send file manipulation commands, zip ...
- 719
3
votes
4
answers
2k
views
Local area network without using the IP protocol in Linux
I've read a little about Internet protocols and deduced that on local area network, there is no need to use the IP protocol, though it's normally used.
Is there a possibility to turn off the IP ...
- 16.3k
33
votes
5
answers
18k
views
What is the need for rsync server in daemon mode
I don't understand the need for an rsync server in daemon mode. What are the benefits from it if I can use rsync with SSH or telnet?
- 5,651
5
votes
2
answers
4k
views
How to copy someone's else folders from public.me.com with a wget-like tool?
How can I copy a folder from http://public.me.com/ (a service related to iDisk, or MobileMe) to my local filesystem with a Unix tool (like wget, a command-line non-interactive tool)?
The problem is ...