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Questions tagged [protocols]

Tag for questions related to data transmission rule sets.

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Using telnet command without protocol negotiation

I'm using telnet to connect to a serial port via a TCP/IP server. I need a raw, unfiltered, unbuffered connection, and can get most of the way there, but no matter what I do telnet sends protocol ...
Daniel Griscom's user avatar
-4 votes
2 answers
604 views

How to force HTTP access instead of HTTPS?

I want to accomplish something unique and use HTTP instead of HTTPS for using all kinds of different websites, and was wondering if anyone has any ideas about how to accomplish this feat. The internet ...
guest user's user avatar
0 votes
1 answer
63 views

Question on encrypted DNS over Quic? How is it encrypted?

Suppose,I am using DNS over Quic. Since it is an encrypted protocol as it claims. My question is if intermediate servers cannot see my dns query, how will my dns query be resolved? It says that the ...
Mikey's user avatar
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0 votes
1 answer
66 views

Can I disable congestion Control in QUIC in linux?

I want to know if I can somehow disable congestion control in QUIC.
Mikey's user avatar
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2 votes
2 answers
2k 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 ...
ron's user avatar
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0 votes
2 answers
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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 ...
chilli's user avatar
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0 votes
1 answer
290 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 ...
Flux's user avatar
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2 votes
1 answer
451 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 ...
Sascha's user avatar
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3 votes
1 answer
1k 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 ...
ankur katiyar's user avatar
4 votes
3 answers
4k 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:...
firespasm's user avatar
2 votes
0 answers
746 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 ...
Cedric's user avatar
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0 answers
42 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 ...
Brian's user avatar
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0 votes
1 answer
230 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 ...
Tak's user avatar
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0 answers
480 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: ...
Başar Söker's user avatar
2 votes
1 answer
9k 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 ...
Audra Jacot's user avatar
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 ...
Porcupine's user avatar
  • 2,056
0 votes
1 answer
197 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 /...
Iván Carvallo's user avatar
1 vote
0 answers
125 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 ...
rahulmehta95's user avatar
12 votes
5 answers
7k 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 ...
Rick's user avatar
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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 ...
sixty4bit's user avatar
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1 vote
2 answers
8k 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 ...
not2qubit's user avatar
  • 1,716
0 votes
1 answer
188 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 ...
Tommy's user avatar
  • 257
1 vote
2 answers
467 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 ...
Tim's user avatar
  • 103k
3 votes
2 answers
572 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 ...
Tim's user avatar
  • 103k
14 votes
1 answer
59k views

Available min max values for SMB protocol

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 ...
ron's user avatar
  • 7,264
3 votes
0 answers
1k 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, ...
Subbu's user avatar
  • 151
1 vote
0 answers
189 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-...
Spartan113's user avatar
1 vote
2 answers
3k 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-...
林果皞's user avatar
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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 ...
Niklas Rosencrantz's user avatar
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.
NathaneilCapital's user avatar
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 ...
Vlastimil Burián's user avatar
26 votes
8 answers
39k 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 ...
imz -- Ivan Zakharyaschev's user avatar
2 votes
1 answer
5k 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 ...
maihabunash's user avatar
  • 7,181
1 vote
0 answers
195 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 ... ...
Darknmoody's user avatar
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 ...
user53029's user avatar
  • 2,843
33 votes
1 answer
12k 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 ...
AttributedTensorField's user avatar
2 votes
0 answers
462 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 ...
ndandanov's user avatar
10 votes
3 answers
26k 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:...
user80551's user avatar
  • 1,639
22 votes
3 answers
30k 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, ...
bernie2436's user avatar
  • 6,705
2 votes
1 answer
292 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 ...
Ron Vince's user avatar
  • 1,452
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 ...
gsgx's user avatar
  • 855
0 votes
1 answer
72 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, ...
user26676's user avatar
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 ...
Michael D.'s user avatar
  • 2,890
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?
Greivin López's user avatar
5 votes
1 answer
401 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 ...
SetSlapShot's user avatar
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 ...
Ali's user avatar
  • 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 ...
Vangelis Tasoulas's user avatar
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://...
user35443's user avatar
  • 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 ...
imz -- Ivan Zakharyaschev's user avatar
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: ...
Strae's user avatar
  • 233