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Questions tagged [network-protocols]

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Does Team Viewer/AnyDesk or Chrome Remote Desktop protocols works like VNC or like RDP?

I'm familiar with two conncepts of accessing remote desktop: a) Remote Framebuffer (like VNC), which snapshoting local rendered framebuffer, compressing image and sending it over network + reciving ...
Greg_em's user avatar
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2 votes
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WSL2 cannot connect to the Internet when Sangfor aTrust is running

I am using WSL2 on Windows 11 22H2 22624.1470. Ubuntu 22.04.6 LTS installed on WSL2. When I run a program called aTrust, which is developed by a corporation called Sangfor, my WSL2 cannot connect to ...
szw0407's user avatar
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2 votes
1 answer
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Redirect OR warn (during initial negotiation?) SMTP submitters to use TLS on port 587 - leave 25 explicitly blocked by firewall for better security

This question went over poorly on S.F., but as I said there I've managed to find a lot of closely related information, but not an answer truly addressing my question. I am expanding on my homelab ...
MJHd's user avatar
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What protocols do I need to read along to make sure I don't miss any traffic and cover all the communication from the web browser?

For a university project, I need to record all the traffic that a web browser sends to a server. The goal is to find the input that the user made on the website in the resulting traffic. The project ...
necro_167's user avatar
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1 answer
593 views

Wireshark showing Cloudflare WARP packets as DLEP instead of WireGuard or UDP

From what I've found so far, DLEP belongs to Cisco ? and Cloudflare WARP is supposed to use WireGuard I need help understanding why I'm seeing DLEP packets in WireShark instead of UDP or WireGuard. I'...
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Programs that use URN protocol

Does there any Windows 10 program or handler to use URN protocol? It's possible to write a script that handles the URN protocol and register it in the Windows registry. But is there a finished utility?...
888levant888's user avatar
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1 answer
21 views

Is there a URI scheme to open a predefined MUA reading a given email?

There are some well known URI schemes, for example: file:// will tell the browser to do not perform an HTTP call and open a file instead. Example: file:///C:/Users/alice/Desktop/README.txt mailto: ...
Xavi Montero's user avatar
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1 answer
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Why are counter-based TTLs considered measurements of time?

I'm learning about examples of TTLs (Time-to-Live fields) in low level network protocols, such as the TTL used in ICMP packets (ping/traceroute packets). Frequently, I see ICMP TTLs referred to as ...
DaMaxContent's user avatar
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1 answer
1k views

How to connect to a VPN on linux when the client is only available on Windows

I have to connect to a vpn with my linux machine, the problem is that the client is available only for windows (ZyWall SecuExtender). Now, is there a way to connect to the vpn without the client? (...
Ravazz's user avatar
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5 votes
3 answers
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Why do DHCP clients leave the port open after the lease now?

I've noticed on some embedded linux systems that both dhcpcd and systemd-networkd leave the DHCP client port 68 open after the lease has been acquired. The fact both systems do this indicates it's a ...
davolfman's user avatar
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1 answer
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SSDP replies from 192.168.1.1. What exactly is at this ip address?

When I send a crafted ssdp request packet with ssdp:all to 239.255.255.250, an address 192.168.1.1 replies with a bunch of HTTP 1.1 OK ssdp messages(captured on Wireshark). Are these ssdp services ...
Mera's user avatar
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146 views

Is there a universal cross-platform printer sharing protocol?

There is a printer connected to the Windows machine. The printer does not have a Linux driver, there is only a driver for Windows (hug you all, Nvidia and printer vendors). Is there any universal ...
Hug you Nvidia's user avatar
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1 answer
110 views

What is a bolt connector?

In the article Configure connectors - Operations Manual of Neo4j, there is a term "bolt connector": But searching the web with the query bold connector or bold protocol I don't see anything ...
Ooker's user avatar
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Reliability of UDP over IPsec

I've read about IPsec today. The article stated that IPsec provides security and integrity checks at layer 3. If information above is correct, does it mean that UDP used over IPsec can be considered ...
mikerru's user avatar
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612 views

How to pass binary data and meta-data using HTTP GET

I'm using BaseHTTPServer.BaseHTTPRequestHandler in order to implement my server. currently I repsonse to get request with merely binary data file. self.send_response(200) self.send_header("...
Zohar81's user avatar
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Host with identical ips and subnet mask different

Two host with following IP’s. How they will communicate.? With and without a router. Case a. 1.1.1.1/24 & 1.1.1.2/24 Case b. 1.1.1.1/24 & 1.1.1.2/32 In case a, they will communicate via switch ...
Rahul K V's user avatar
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1 answer
232 views

How can I find the aplication layer protocol that is being used and shown in the Wireshark window

Hi everyone I'm trying to find the name of the application layer protocol that belongs to the frame 7 shown below. I'm trying to find it just by looking at the metric values and the routing info, that'...
Dacaramo's user avatar
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325 views

Why does s3.amazonaws.com respond with 400 Bad Request when I connect over telnet?

This is what my request looks like. I have confirmed that the end of line separator is CRLF: telnet s3.amazonaws.com 80 GET / HTTP/1.1 Host: s3.amazonaws.com User-Agent: Mozilla/5.0 (Windows NT 10.0; ...
PHP Guru's user avatar
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1 answer
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on windows 10, how to make sites use only ipv6, and block ipv4

sites say that blocking ipv4 is at os level and not browser level when you go to sites, use only ipv6 steps?
list steps's user avatar
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1 answer
213 views

Understanding the 802.11 frame structure and Android probe request different?

I have read here and on Google a lot about the 802.11 Frames but something doesn't add up. this is what I see when I scan using ESP12 wifi Byte 00-11 : a7 10 75 50 00 00 00 00 00 00 0c 00 ...
Afik_Android's user avatar
1 vote
2 answers
1k views

three way handshake in application protocols?

I was reading an article (https://www.inetdaemon.com/tutorials/internet/tcp/3-way_handshake.shtml) which says: FTP, Telnet, HTTP, HTTPS, SMTP, POP3, IMAP, SSH and any other protocol that rides over ...
amjad's user avatar
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3 answers
12k views

Unable to bind hyper-v virtual switch to ethernet adapter

I'm having trouble creating a virtual switch for a virtual machine I have in hyper-v. I had a virtual ethernet switch set up and connected to the machine before, after deleting this at some point, I ...
Dale Newton's user avatar
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1 answer
3k views

Is there a token based alternative to ssh public/private key protocol?

So, as I know ssh public key doesn't expire if you do not generate a new pair. Is there a way to grant the access to the client for a certain duration ? Like a token based authentication. So ...
Sandro's user avatar
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-4 votes
2 answers
480 views

What's the HTML protocol?

I read a document, there is examples in TCP/IP layer. you see there is a HTML protocol, but I do not hear about it. is it mean HTTP protocol?
244boy's user avatar
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1 vote
1 answer
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Does FTP control connection have binary or textual data inside?

From this post we know that There are two common modes for transferring files via FTP, ascii and binary It is about media connection. But also there is a control connection, which has some info ...
z0lupka's user avatar
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1 answer
45 views

To what extend I can use FTP?

As far as I know that FTP is designed to help clients communicating with servers to download/upload files from/to the target server. If that server is secured then the client is required to key-in the ...
Muaath Alhaddad's user avatar
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0 answers
29 views

How can I open new iptable's related connection?

I am reading about iptables's related connection and started wondering what if I wanted to make a new protocol, which would open new related connection. How could iptables possibly know, the new ...
Přemysl Šťastný's user avatar
1 vote
0 answers
39 views

IOT rak button unable to connect to dragino gateway through lorawan

i have this iot button brand RAK lorabutton, and i'm trying to connect it to a dragino gateway through lorawan protocol in order to connect it to a theInternetOfThings server. but the problem is that ...
chuni's user avatar
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15 votes
1 answer
34k views

SSL protocol seems to be missing in Wireshark

SSL protocol seems to be missing for me. It doesn't show up in the preferences menu and Wireshark doesn't capture any SSL packets from any program I try. I also had a failed handshake trying to just ...
Nedas Bolevičius's user avatar
1 vote
0 answers
837 views

Multiple connections on same port using netconn

Trying to develop a MODBUS Slave application via STM32H743BI using LwIP 2.0.3 and FreeRTOS 9.0.0 My app should be able to handle multiple clients simultaneously. I want to create seperate threads for ...
doner_bicagi's user avatar
2 votes
0 answers
615 views

How can I capture and analyse LTE packets using Wireshark and LTE modem? [closed]

Is it possible to analyse LTE packets using Wireshark. I'm having trouble using Wireshark to capture mobile LTE traffic. I ma using a MacBook and a LTE modem. Do I need specific configuration to ...
pajtimid's user avatar
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0 votes
1 answer
486 views

Why DNS look up is UDP?

UDP does not guarantee the message delivery Does not guarantee ordered transmission. Its connection less. But per my understanding DNS shouldbe needing all these three features while lookup. Let's ...
user3198603's user avatar
1 vote
1 answer
2k views

What is it happening if a port is constantly (since one or more days) in FIN_WAIT1?

I've a problem when I try to communicate with a server. If I use the command line: netstat -np 10.aaa.bbb.12 where 10.aaa.bbb.12 indicates the server address; I obtain an extract with the ...
Sir Jo Black's user avatar
3 votes
3 answers
1k views

Is a DNS packet with only a header (no questions or resources) valid?

Looking at RFC 1035 I am trying to determine what the proper response is for a packet that contains nothing but a DNS header, where all the "counts" are zero: id short X qdcount short ...
Kristopher Ives's user avatar
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1 answer
106 views

allow other networks to connect to my computer through the internet

I am trying to create a virtual machine with virtualBox which can be accessed from other networks. I explain myself more; I have an application in my virtual machine and I want that from another team ...
Andres ZL's user avatar
2 votes
1 answer
2k views

FTP/FTPS looks like it's gradually being deprecated. What are Windows + browser clients moving to and what should I provide instead? [closed]

In the past I've used FTP over TLS to let non-technical friends and family remotely access important files on my server. I've just found that they can't do so using Firefox any more, and the firefox ...
Stilez's user avatar
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-1 votes
1 answer
57 views

Partial network fallout (Gmail, Facebook,…)

Firefox and Google chrome are unable to connect to gmail.com, facebook.com and a few other random sites. Most sites still work. Error message from Firefox (14-10-2018 version): Secured connection ...
JScoder's user avatar
-1 votes
1 answer
55 views

Change next hub on Comcast modem [closed]

I’m really curious about networking and I have a question. Assuming that my ISP is Comcast , my modem will forward my traffic through its public address and if the host that I’m asking for it’s ...
Alvaro Lamadrid's user avatar
1 vote
2 answers
246 views

List of IP protocol numbers 84 two times in list

I am referring the List of IP protocol numbers based on the wikipedia page but the number 84 seems appeared two times, is it a bug. I have to use this inside my javascript program. Here is the ...
Haris's user avatar
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1 vote
0 answers
64 views

Adjusting the rate of an MQTT configuration

I have a problem that I am trying to solve which feels like it is a common problem and thus probably has a common solution in the form of a network protocol. My knowledge of network protocols is ...
Alex Ryan's user avatar
  • 111
1 vote
1 answer
49 views

how to tunnel using a specific protocol

I have an internet connection where the ISP has allowed a specific set of protocols such as facebook, youtube, H.323 Data, etc on my network which are unlimited. Is there a possibility which I could ...
Imesh Chandrasiri's user avatar
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0 answers
494 views

Wireshark capturing only protocols SSDP, NBNS, LLMNR etc

I'm running Wireshark on my Ubuntu laptop and trying to capture WLAN traffic from my Windows laptop, but I can only see protocols as mentioned in the title: SSDP, LLMNR, NBNS, MDNS, IGMPv3. ...
Mike's user avatar
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-1 votes
2 answers
7k views

Why do I have such a low WiFi speed?

Ok, first of all I've had an internet plan for 100mbps for about two years now and my speeds looked like this: (Results from www.speedtest.net) Wired: Download - 92mbps , Upload - 94mbps WiFi (...
Deividas's user avatar
1 vote
1 answer
379 views

How does the computer know who is the router

I was wondering, when I plugs in the ethernet cable, how does my computer know that this is a router that just plugged in? I mean, the router is allways listening and waiting for new connections, so ...
xsss's user avatar
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0 votes
0 answers
24 views

Reference model of application/host/gateway/network levels

On page 9, RFC793 describes the place of TCP in the protocol hierarchy as follows: +------+ +-----+ +-----+ +-----+ |Telnet| | FTP | |Voice| ... | | Application Level +------+ +--...
user2964971's user avatar
6 votes
1 answer
41k views

Which protocols are used for network share access

I want to figure out how to audit file access on Windows using network share access. I have 2 computers that run Window 8 and that are not in joined in an active directory domain. Computer 1 has ...
oleksii's user avatar
  • 850
2 votes
1 answer
480 views

How to read and interpret Packet Formats in RFCs (Request For Comments)?

Often times when I am reading Request For Comments documentation, I always see the packet format section for a protocol outlined like the one below. My question is what do the numbers and different ...
nd510's user avatar
  • 163
1 vote
1 answer
766 views

Asymmetric Ping Between Two Windows 7 Hosts

Windows 7 Host A has two physical adapters, each with one IP: 10.20.157.10/24 10.20.159.10/24 Windows 7 Host B has two physical adapters, each with one IP: 10.20.156.10/24 10.20.158.10/24 Windows 7 ...
Dave's user avatar
  • 1,019
1 vote
1 answer
6k views

Can single incoming Coaxial Cable carry signals for 2 separate services; Cable Modem ISP (DOCSIS 3.x) & Digital Cable TV Set top Box STB (DVB-C)?

Can single incoming Coaxial Cable carry signals for 2 separate services; Cable Modem ISP (DOCSIS 3.x) & Digital Cable TV Set top Box STB (DVB-C)? Single incoming Coaxial Cable with Joiner/ ...
Alex S's user avatar
  • 991
0 votes
1 answer
2k views

What is the fastest protocol for downloading files from a server on the internet

I have over 100GBs worth of files on a server sitting on a dedicated 1GBs port. Our office sits on a 100MBs port. Each of the archive files are about 1-5GBs each. What protocol would be the fastest ...
Jason's user avatar
  • 4,056