Questions tagged [network-protocols]

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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?...
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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: ...
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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 ...
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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? (...
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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 ...
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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 ...
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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 ...
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1 answer
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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 ...
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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 ...
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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("...
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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 ...
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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'...
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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; ...
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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?
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1 answer
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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 ...
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2 answers
750 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 ...
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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 ...
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1 answer
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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 ...
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1 answer
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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 ...
1 vote
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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 ...
2 votes
0 answers
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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 ...
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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 ...
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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 ...
2 votes
3 answers
790 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 ...
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1 answer
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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 ...
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1 answer
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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 ...
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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 ...
-1 votes
1 answer
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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 ...
1 vote
1 answer
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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 ...
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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 ...
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1 answer
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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 ...
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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. ...
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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 (...
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1 answer
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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 ...
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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 +------+ +--...
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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 ...
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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 ...
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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 ...
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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/ ...
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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 ...
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Can i turn off a computer with just one TCP packet

So you can wake on lan, because the ethernet cables are not for data only, they transmit amperage too. If they are directly connected to the motherboard can someone throw a packet and turn off your ...
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Why is address family mandatory when using icmp with pf?

there. I wasn't able to find the answer for this question: when creating an ICMP pf rule, I must tell it's inet or inet6 address family; I would like to know why, as proto icmp is for inet and proto ...
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How to convert IMAP to POP3

I have an email server that only have IMAP interface. On the other side, I have another Special-purpose mail client (a kind of embedded system) that only accepts POP3 protocol. How can I connect the ...
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Authority section in DNS packet contains only NS records?

I'm new to DNS and I'm trying to understand the DNS packet format. From what I understand, the authority section of a DNS packet gives information about servers that are authoritative for the domain ...