I want to know how a network packet travels through different layers, i.e. from the physical layer to the presentation layer in Linux systems.
Are there any detailed articles or books on this topic with code?
I am the new user to ns-2. I would like to know is it possible to send the keys or some value as the packet data (content of the packet) in ns-2 (for wireless environment).
View 1 Replies View RelatedI got a problem with my CentOS server. Somebody told me OpenVPN Requires different changes inside my firewall settings. That could be the problem why openvpn wont load..I receive this error on my CentOS panel when im trying to connect into the centos openvpn (with my winxp pc):
Thu Sep 17 20:31:36 2009 TLS Error: incoming packet authentication failed from 84.xx.62.122:2622
Thu Sep 17 20:31:38 2009 Authenticate/Decrypt packet error: packet HMAC authentication failed
Thu Sep 17 20:31:38 2009 TLS Error: incoming packet authentication failed from 84.xx.62.122:2622
[code]....
I've got the OK from my manager to set this up, so I just need a little help. I've seen the tutorials on setting up VNC over SSH which works all fine and dandy, but I need access to my work PC when I'm not on the University Network. To log in to the command line I would have to ssh from putty to a central box that is visible to the outside network (i.e. the world) and from that box, I would have to ssh into my workstation.
Logical flow: SSH-Putty --> SSH-Midddleman --> Desktop-command line
How would I setup VNC to deal with the middleman?
I'm trying to setup OpenVPN in order to connect back to my home network while traveling for secure browsing and such. However, before I can even start trying to set that up I tried to see if I could open port check my computer through the net. And I'm having a hard time doing that.
As far as I can tell, here are my roadblocks:
1. Is ISP (Qwest) blocking my ports?
2. Is my modem doing the proper port forwarding and firewall?
3. Is my router doing the same?
4. Is my firewall on the computer allowing the request?
To minimize sources of error, I've turned off my local and router firewall and setup my router to forward ports. I'm not to familiar with my modem, but I'm pretty sure that the firewall is turned off by default and I think I've done port-forwarding correctly. But still no success when doing an open port check. At this point I don't know how to diagnose the problem.
I do a lot of artistic stuff, so I need a good graphics program. I think Gimp will be perfectly fine for my needs for the time being, but I can't find the layers box. When I opened it for the first time, only the toolbox and tool options were open, and I can't find anything about the layers. I checked the online manual, and that didn't help at all. I have version 2.6.
View 2 Replies View RelatedOpenOffice 3.0 on Ubuntu 9.04
I have a card project in OpenOffice Draw. In this project is a bitmap with the year 2009 embedded in it. I want to change that to read 20 and I can place the current year as a text layer on top of it.
I have a grid laid out on this bitmap, and I have overlaid text information such as date, time and frequency.
I got hold of the bitmap and cut it, leaving my data there but the form behind it missing. I pasted that into gimp and did the editing, saved it as a .bmp file and loaded that into Draw. I copied the bitmap from this bmp file and pasted it back into my card project.
The bitmap is now sitting on top of my data and I want to send it to the rear so my data sits on top of it.
I can not find a single reference to how to send layers to the front or to the back in OpenOffice Draw.
Launchpad.net is a way to get help online, but I am completely lost on that site, so I am asking here on the Ubuntu forum.
I add layers and they don't show up and the controls at the bottom of the layers palette (add layer, bin, etc) are all blanked out and i can't select them. It's impossible to do anything with layers in GIMP as it is at the moment and i need to get it sorted. I have tried closing down the layers tab, restarting GIMP and then adding the tab again but i get the same result, a layers palette that won't respond or show any layers that i do add.
View 3 Replies View RelatedI installed the gimp-gap package from the repositories. When I attempt to use the "filter all layers" function I get multiple errors, and the plugins are not available to me.
Errors:
Code:
GIMP Message
Calling error for procedure 'gimp-procedural-db-proc-info':
Procedure 'plug-in-diffraction-Iterator' not found
GIMP Message
Calling error for procedure 'gimp-procedural-db-proc-info':
Procedure 'plug-in-solid-noise-Iterator' not found
[Code]...
I want coding of packet sniffer that runs on red hat and use c++ language.
View 2 Replies View RelatedDoes anybody know how to implement packet reordering in NS2? I would be very glad if someone provide me with appropriate tcl script or give a link.
View 3 Replies View RelatedIs there a default built in packet sniffer program in Fedora 8 ?
View 1 Replies View RelatedCurrently i am working with linux code. I need help in printing data in ip packet. In my program i am defined the headers and defined ip packets. But I am having problems with printing data in the ip. I am thinking that for loop has to be used, but what parameters to use
View 2 Replies View RelatedI am trying to send data via UDP using sendmsg on the sending side, and recvfrom() on the receiving end.The setup for my data is to have an iovec that has a packet hdr, followed by an iovec that has a payload, then to have subsequent sets of these two types of iovecs. On the receive end, I have a while true loop that does a recvfrom() receiving a size of 1 hdr/payload combination.When I do send out a message that has a total of just 4 iovecs (hdr/payload/hdr/payload) and I use recvfrom on the remote end with a receive size of a hdr/payload set,only the first hdr/payload of the sendmsg is received.I was under the impression that using this while true loop would allow me to receive multiple sets of this hdr/payload combination that is sent out by sendmsg().
View 1 Replies View RelatedAs i am posting in this forum you might already have guessed that I am a total linux noob, but I am a pretty faster learner. I know a few basic things but I feel like I am stuck with my problem.I want to send the Magic packet (wake on LAN) from my linux machine to another, but I am unsure how to approach this. I have google�ed my ass off but I am none the wiser. I found a few forums posts and programs that can do the trick and guides in how to use the programs but I have no idea how to install them.You have to know that my linux machine is a NAS server and has therefore only Konsole access (no GUI). As I said before I am pretty much a noob
View 16 Replies View Relatedanyone know network packet editor for Linux? or modify network packet in wireshark?
View 1 Replies View RelatedYou have accepted the terms to the EULA. Cisco Packet Tracer will now be installed.
Attempting to install package now Preparing...
I need to do a project for my cisco class and i need to get this Packet Tracer to start working!
I am trying to get an arp packet from my wireless wifi router (access point), to which I am not connected. I simply tried ping 192.168.0.1, but the answer was connect: network is unreachable. What can I do about that?
View 1 Replies View RelatedI am facing problem(system gets crash) while I try to send IPv6 packet by using my kernel module. I have given the code and makefile for my module. I will appreciate if any one shares any tester module for sending IPv6 packets.The kernel version that I am using is 2.6.9 and it supports for IPv6.
file name: rtp_pkt_tx.c
#include "linux/kernel.h"
#include "linux/module.h"
#include "linux/skbuff.h"
#include "linux/init.h"
[Code]...
I am actually making a packet sniffer using raw socket. Its just that when I use the command '
if((ioctl(rawsock, SIOCGIFINDEX, &ifr)) == -1)
to get the interface index...
Its gives me an error saying :invalid argument?
On Linux, is root privilege required to send a wake-on-lan magic packet? If it depends on how you send the magic packet, please let me know under what situation root is required.
View 1 Replies View Relatedi m not able to help any software due to my proxy settings. my proxy block all the download links. not able to install software from terminal or synaptic packet manager
View 8 Replies View RelatedI would like to know the command lines for;
-detecting the wifi in my house without being connected to it
-getting ips/macaddress from the people connected to the wifi
I am trying to change the IP address of the traffic that has been stored. I have tried different commands:
[code]...
however, either from these two commands end up with a following error:
[code]...
when I searched for a solution and generic commands I used those two websites: website1 website2 Commands have been tested using a casual user account as well as a privileged one (root).
I am in a hub(with switches and rooters) and i want to spy what packets everyone receives! if can i do this and if i can which tools i can use?
View 6 Replies View RelatedI have recently upgraded a computer from Wheezy to Jessie, and I'm having trouble getting an internet connection shared via Ethernet by another computer (the provider) to work on it.I have activated the interface of the Jessie computer and configured a static IP on it in the same subnetwork as the provider's ethernet interface with the following commands:
Code: Select all# ip addr add 192.168.123.201/24 dev eth0
# ip link set up dev eth0
I now would like to set the address of the provider as the default route with Code: Select all# ip route add default via 192.168.123.100 dev eth0, but I get the following error message: Code: Select allRTNETLINK answers: File exists.
Indeed, when I run Code: Select all# ip route, the following comes up:
Code: Select alldefault dev eth0 scope link
I've tried to remove this default route to replace it with mine with Code: Select all# ip route flush table main and Code: Select all# ip route del default but these commands don't seem to work.
I have to do a .deb packet which will be placed in the repositories of the company.When this packet is installed, it only have to copy a plain text archive i've wrote before, to a path where it's being installed.The other requisite is that it have to watch if there's a program (vim) installed, if it's not installed, then the packet i have created shouldn't install.example:
# ls /home/loopin (as we see, this directory is empty)
# apt-get install mypacket
...
[code]...
I am trying to simply address translate TCP packets from one destination IP to another destination IP (DNAT?) without getting the initial SYN packet. Is this possible? I do not think it is with DNAT since the conntrack needs SYN first.
I have given the command:
The problem is that the first packet that matches this rule will be the SYN-ACK and I suspect it is simply DROPPED.
I am sparing you the gory details of why I would do such a silly thing, but simply put; I need to intercept client-to-server packets through a tunnel, but allow server-to-client packets to follow through the regular network.
I have been working on this for many days w/o success and my learning curve is still steep. I can provide more details as needed.
My question is about the raw MX reply package structure. I've read the RFC and all relevant pages I could find, but I couldn't figure this one out. Say we do a google.com MX query.
The first answer (just the rdata part) will be: google.com.s9b2.psmtb.com But in the raw package, instead of the .com, you have c0 13. Then for the second answer, google.com.s9b1.psmtb.com, the raw package has, instead of psmtb.com, just c0 3a. So is the part after c0 a pointer towards another part of the message? Or what does it stand for exactly? I am puzzled by it, and don't know exactly where to ask... some of the networking people here might have a good idea.
From all the stuff that can enter an interface, how does it know when an IP packet has been *formed*? What if it's just random garbage entering there for whatever reason? Also, can Linux do other protocols besides TCP/IP? This would be the problem, as I said above.
View 2 Replies View Related