Tagged Questions
0
votes
1answer
98 views
Why is my UDP so slow?
I'm using Iperf on two VMs and when using TCP I find the performance is as follows:
notroot@ubuntu:~$ iperf -s
------------------------------------------------------------
Server listening on ...
0
votes
1answer
47 views
sent packet is different from received packet
I use raw socket to create TCP packets, with focus on the sequence number and TCP flags(SYN, ACK)
I used one machine S to send a tcp ACK packet (flag ACK is set to 1)
and another machine R to receive ...
13
votes
2answers
584 views
If two devices are emitting a wifi signal in the same frequency at the same time and reach an antenna at the same time, how can the data not overlap?
I mean, I know each packet is sent with a MAC address, but what about streaming?
What happen if while the router is receiving one packet, a packet from another device arrives?
How can the router ...
0
votes
1answer
115 views
Copying files over home network (windows 7 laptops) is super slow
I have two Windows 7 laptops (one Dell and other Toshiba). I have a shared folder on the toshiba-pc, and both are connected to a wireless router. When I copy a large folder from toshiba-pc to dell-pc, ...
4
votes
1answer
99 views
Is there a program that would make it easier to look at how network protocols work?
I'm interested to know more about how certain network protocols work (like SSH or FTP for example). Is there a program that can facilitate connecting to computers on the network and communicating with ...
2
votes
1answer
103 views
How do I figure out if my wireless network has WEP, WPA or WPA2 security via command prompt on Windows XP?
I understand how to check what security protocol my wireless network connection is currently using by going to the Wireless Network Connection window like in the following example
but how does one ...
2
votes
0answers
47 views
Most network protocols occasionally fail
My Windows 7/64 machine has suddenly started to act funny. Everything will be running fine, when suddenly most network access methods will fail. These things continue to work:
Accessing network ...
0
votes
1answer
98 views
Why does Knoppix mess up my internet connection?
I have this problem that when I boot Knoppix on my Windows box, it screws up the internet connection somehow, so Windows cannot get an IP when I reboot back to XP. I use Verizon FIOS. Normally I have ...
1
vote
2answers
142 views
Why is there an interface field in routing table?
Imagine that we have an IP-packet, and we need to figure out which interface it should be sent through. There is an eth0 (for example) corresponding with our packet destination address.
But what if ...
1
vote
3answers
83 views
In which network layer is the data located that lets a gateway(using NAT) know which computer a packet is meant for?
Main questions:
In which network layer is the data located that lets a gateway(using NAT) know which computer a packet is meant for?
Could someone explain how the process works?
In explaining the ...
1
vote
3answers
115 views
Why do I not get to the same website when using this IPv4 address instead of the url?
When I capture packets using the packet analyser wireshark while visiting http://en.wikipedia.org/wiki/Hydrogen I can see packets that use the HTTP protocol (e.g.a GET request). My Get request uses 4 ...
1
vote
1answer
3k views
What does `Type: IP (0x0800)` in the Ethernet II part of a ping packet mean?
If I ping to another pc in my network I send a packet that consists out of an ICMP part, a IPv4 part and a Ethernet II part. I can see this using the packet analyser 'wireshark'.
Now the Ethernet II ...
0
votes
1answer
233 views
Can two network adapters work in different IP protocols simultaneously？
My laptop has two network adapters, one is wireless and connected wirelessly to a wireless router, another one is wired and connected to a network supported IPv6 with cable.
The question is , can I ...
1
vote
2answers
241 views
Ethernet a protocol or cable?
Is ethernet a protocol or cable? How it is different from Cat-5 cables? I'm very confused when I hear the term 'ethernet' for a protocol and cables.
0
votes
2answers
37 views
Sharing internet connection.- Complex
Scenario
1 Desktop , 2 Laptops , one wifi router , one network cable . All computers are on win XP
Laptop A and Laptop B are connect to the network of wifi Router, they can access internet.
My ...
7
votes
4answers
448 views
Is there a good example for acknowledged, connectionless network protocol?
According to what I've read, there are three main connection types in computer networks:
Unacknowledged, connectionless (e.g. UDP)
Acknowledged, connectionless (e.g. ?)
Acknowledged, ...
6
votes
4answers
11k views
how does 'ping' command really work?
How does the ping command really work? Specifically where does the ARP (Address Resolution Protocol) come into picture?
I was asked this question in an interview and I was not able to come up with ...
0
votes
3answers
3k views
How do I “telnet into [my] favourite Web server”?
I'm reading a book about programming, and I want to check an HTTP response message. The book is instructing me
to telnet into your favorite Web server. Then type in a one-line request message for ...
14
votes
4answers
3k views
Ethernet vs TCP vs IP?
What is the difference between Ethernet, TCP, and IP in simple (simple abstract) terms?
Please do not copy from Wikipedia...
0
votes
3answers
59 views
How does the home wireless perform if it connects to a public access point?
Assuming that there is a access point(hotspot) covering a dozen of houses. Besides, these houses also have their own wireless network. So, if everyone in each house connect to the Internet at the same ...
