All Questions
38
questions
1
vote
0
answers
123
views
Why is TCP connection on Windows machines, retransmitting after receiving a correct ACK from HTTP server
Using two different Windows laptops, one with Win 7 and the other Win 11, I'm trying to connect to the HTTP GUI of a device (cell phone booster) that's connected directly to my laptop through an ...
- 139
0
votes
0
answers
30
views
File service latency is high, How to troubleshoot?
This service is a file upload service and the request packet capture in the live network is as follows:
The data uploaded by the client is halfway through, and then it will not be sent
The server ...
- 1
0
votes
0
answers
2k
views
TCP Retransmission (TCP Port numbers reused) issues
I developed a web server and this is running on GKE.
Whenever I send any request to this server from my local pc, it occurs TCP retransmission.
Following is captured packets with Wireshark. The red ...
- 111
0
votes
1
answer
758
views
Connecting to a home server on a cellular hotspot
I am seeking advice on a networking issue I have run into recently. I suspect that I a making an obvious mistake in my assumptions about connections between machines on separate networks.
My goal is ...
0
votes
0
answers
363
views
How to show a HTTP stream from VLC Player in Wireshark?
I just set up a HTTP stream of a video between my Server and Client system using the VLC media player (using the command line). Both the systems run Ubuntu 20.04
vlc -vvv <path to video file> --...
- 1
0
votes
0
answers
146
views
Chunked HTTP response does not come through completely
Consider the following setup
+-------+ +--------+ +----------+
| | | | | |
| +----------->+ +---------->+ ...
0
votes
2
answers
588
views
Sending HTTP content over multiple TCP connections
Is it possible for an HTTP content to be sent over multiple TCP connections?
If so, what fields indicate that this has occurred? I would assume partial-content?
0
votes
2
answers
90
views
How to drop to a lower osi layer?
Is there a way I can initiate a higher level connection i.e. an http connection and then at some point "down grade" it to a lower layer or tcp?
Basically, once the connection has been made with http ...
- 7
0
votes
0
answers
169
views
How default Web Page is loaded with just TCP connection and no HTTP transaction?
Below is the packet capture from WireShark when a web request is made to the Google Server
172.217.26.228 is the IP address of the Google Server.
Filter that I am using is
(ip.dst == 172.217.26....
- 659
2
votes
1
answer
148
views
Why are initial connections always slower
I first noticed this when using Insomnia (HTTP clients) to test some of my API endpoints.
The first request I make to my API server (and others) is always 100ms+ but sequential requests are always ...
- 23
0
votes
1
answer
61
views
Does HTTP as a protocol include any mechanism for guaranteeing information?
I asked this question on networkengineering.stackexchange, without realizing that any protocols on top of TCP were off topic (i.e. that only OSI layers 4 and lower are on topic there).
The question ...
- 346
0
votes
1
answer
2k
views
tcp session - http request [ x out of y] in wireshark capture
As below, i am seeing this [HTTP request 1/2] and [HTTP request 2/2] in 2 separate payload, are they separate GET request in a single tcp session or are they the same GET request ???
====
Added full ...
- 1,625
-1
votes
1
answer
71
views
Wireshark - what happened?
This Wireshark issue has been driving my crazy for a few hours. What's happening here?
192.168.2.100 is an Apache server that is serving a static file.
192.168.2.196 is an embedded client ...
0
votes
1
answer
85
views
HTTP Post: File upload occurring prior to HTTP POST
Note: My apologies if this is the wrong site for this topic. This question was directed to Super User from Network Engineering
I'm following along the UMass Wireshark Labs, in particular, the one on ...
- 374
0
votes
1
answer
49
views
"Follow TCP stream" inserts extra line breaks and strings like "2000" "a7c" "0" (chunking?), how to hide that?
I often use "Follow TCP stream", very convenient to see the whole client/server conversation.
PROBLEM: Some strange characters (that are not in the real packets) are shown. Maybe due to HTTP chunking?...
- 11.2k
1
vote
0
answers
91
views
Strange response from a HTTP server
I noticed an unfamiliar device when scanning my local wireless network. It had two open (listening?) TCP ports; TCP/80 (http?) & TCP/443 (https?).
In an effort to identify the unfamiliar device;...
- 2,751
2
votes
1
answer
117
views
Can't get windows host file to forward HTTPS headers
I'm currently trying to write a proxy in C# using the host file to redirect requests (specific request). I only want it to intercept one address.
It's on Windows and the proxy is run locally on the ...
William Humphreys
0
votes
1
answer
73
views
Can HTTP deliver video over the internet or is that TCP?
The post below talks about delivering video content to users via HTTP. Is it confusing it with the TCP protocol?
https://torrentfreak.com/torrents-time-brings-popcorn-time-to-any-windows-browser-...
user559328
1
vote
1
answer
615
views
Configure Wireshark to capture any packages between host machine, and guest (VM)
I'm new to this whole Wireshark thing. I have a VM running inside my local Mac via VMWare Fusion.
VM IP Address : 172.16.139.129
Mac IP Address : 10.0.0.4
I want to capture http connection between ...
- 444
0
votes
1
answer
5k
views
Which of the following protocols can use multiple TCP connections between the same client and the server?
In one of the pairs of protocols given below , both the protocols can use multiple TCP connections between the same client and the server. Which one is that?
HTTP, FTP
HTTP, TELNET
FTP, SMTP
HTTP, ...
0
votes
0
answers
981
views
How to block HTTP 302 redirection package by matching a specific string on Location?
The HTTP response I want to block has:
Header
HTTP/1.1 302 Found
Location: http://www.yxjiaodai.com/ad/?id=1023&url=http%3A//a1819.oadz.com/link/C/1819/3081547/dtMdon4l79FwsIo2JXEHqtdp5eQ_/p007/...
- 193
0
votes
1
answer
2k
views
Why a POST request uses the PSH flag in the first packet?
I'm trying to understand the behaviour of the POST HTTP Transaction. When there is a GET request with a long URI that needs more than one packet to be sent, the PSH flag is used in the last packet to ...
- 103
3
votes
2
answers
12k
views
If HTTP runs on a port, does that mean TCP can also run on that port?
I'm building an app that needs to run on a mobile smartphone over a GPRS/3G network. I'm doing bit ops, so every byte wasted through HTTP headers is bad. Mobile providers in my area make heavy use of ...
- 147
1
vote
1
answer
428
views
HTTP performance over high latency links
I have users that previously used FTP for file transfers across high latency paths to their local server. They have switched to HTTP for these transfers (not by choice) and file transfer perforamance ...
- 11
11
votes
5
answers
5k
views
How does a server get notified about the HTTP request?
I have a basic understanding of how HTTP works. I understand the client (web browser) makes a request and server responds back to the request. However, the thing I don't understand is how does a web ...
- 129
4
votes
3
answers
7k
views
How does a web server return an HTTP request? [duplicate]
I'm sorry if this is a really stupid question; my networking knowledge is pretty sparse.
So, a user makes a HTTP request to some address. That request comes from an address on a local subnet, but the ...
- 143
1
vote
1
answer
3k
views
Why HTTP response is split in 2 parts: header and body?
I'm trying to understand why a single HTTP response is split in 2 parts in the following setup:
Requested resource is protected by HTTP Digest Authentication on
server side.
Communication is ...
- 13
1
vote
1
answer
428
views
How can I fire many HTTP requests using a single TCP connection?
I would like to know if there is a way to open a single TCP connection to a server and request several pages over HTTP on that connection.
Is there a way to do this using common Linux client tools?
- 174
3
votes
1
answer
4k
views
have tcpdump show the 'conversation' as i would get from wireshark?
Is it possible to get the same output i would get from:
tcpdump port 80 -w log.pcap
wireshark log.pcap
in wireshark Analyze > Follow TCP Stream and then in the bottom drop down Entire ...
- 31
1
vote
2
answers
531
views
Does pipelineing HTTP requests really result in faster page loads? Why?
A frequently cited argument is basically the one contained in this picture
However, this does not reflect the reality of an underlying TCP connection which has to slowstart, and where the client ...
- 3,675