Networking :: Accessing Low Level Network Interface
Jul 7, 2010
I would like be able to access packets coming off the network with the hopes of coding a primitive packet sniffer for learning purposes. I would also like to be able to piece together my own packets and send them out on my network. Eventually, I would also like to write a simple firewall so I want the capability to drop packets as well as let them pass. I assume I will have to access the kernel with some system calls to do this, any one have any information or resources that could help me on this project?
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Jan 6, 2009
I want to know what are the advantages and disadvantages for accessing spi(serial peripheral inerface )from kernel level and user level. like methods of doing it, speed ,memeory utilization etc
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Jul 18, 2011
I have a ppp0 entry with post-up options like this
mapping ppp0
map none photon-plus motorola
map timeout: 12
[code]...
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Jul 28, 2010
Is there an ink level app that works with network printers? I am currently using Ubuntu Lucid x64 with a Canon MX860 printer that was installed using this tutorial: [URL]. Everything seems to work fine (it prints) but I cannot get any of the ink level apps to work (Mtink or Inkblot). After doing some research, my conclusion is those apps only work with USB connected printers. Is that true?
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Jan 20, 2011
We all know linux kernel base layer is made up of structures, in which every object of kernel is well defined. Structure members correspond to object properties required to define object behavior.
For example if we take case of File system.It composed of four objects , superblock objects, inode objects, file objects and dentry object.Each having well defined structure which is being operated by system call handler and by system call service routine in the kernel mode.
Now my question is even in kernel mode we do not have some mechanism by which we can get access to pointer of these structures.We have some macro.
If I want to manipulate structure on my on way, or performing some more operation defined by me.For example after the crash of Hard Disk Drive, having ext2/3 file system, If i want to know all the inode pointers, and block details.
Can I have some way out to do desired operation ??
mechanism to operate on these base label structures, even in kernel mode ..
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Feb 7, 2010
if there is support for Network Level Authentication.
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Apr 7, 2011
I am totally new to Linux and have just installed ubuntu 10.10. After configuring the network interface via dhcp I started getting these messages that come in so frequently I can't configure anything else.
[87.186415] Stack:
Why I am getting this messages and more importantly how do I get rid of them.
The installation is on a VM on Hyper-V.
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Aug 30, 2010
today I tried to configure a network route to a host for testing my network interface. Code: route add 192.168.1.15 eth0 As I have to eth interfaces and both interface got their IP from DHCP (192.168.1.11 and 192.168.1.12) and are in the same subnet, I shut the other interface down:
Code: ifconfig eth1 down Then I tried to test the interface by doing a ping to 192.168.1.15.
Problem: When I unplug the cable from eth0 (and eth1 is still plugged) the ping still works. Somehow my linux (it's debian) powers up again eth0 and pings over this port.
How can I stop my linux doing this. I just want to have the route added only on the one interface - not the other. Is it maybe some case of a default-gateway?
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Jul 21, 2010
[code]...
you can find a cutout of an output generated by "iwlist s" command for a cell. Does anybody know what Quality, Signal level and Noise level mean? What is the definition of them? I searched for it and could not find good information on it. What do these Extra:*** fields for? What does it show in the example above? How were those values computed?
[code]...
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Jun 30, 2011
Well I really don't understand why Fedora Project has changed the way to start in the level what I need by changing the inittab file. Now is a bit complicated and following the instruction in the fedora.wiki the only thing I get is block my access to the graphical interface and blocked the access to my shell. I've deleted the original 'default.target' file and replaced it by the multi-user.target pointing out to the 'runlevel3.target'. Thus the only thing is my blue screen with Fedora logo freezed. How to recover my graphical interface?
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Mar 30, 2010
I find it hard to explain but I will try. I have a small network using CentOS 5.4 with a static ip and I am running a web server which has an local ip of 10.1.10.100 and has the domain name of www.inwoon.net.My problem is I have other computers on the same network and can only access the web server using 10.1.10.100 instead of www.inwoon.net. am finding it to be impossible to test my web site work using external links that call back to my site
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Oct 10, 2010
I have a network where several machines are connected through a switch. I'd like all machines to be able to read/write to/from the hard drives of the other machines. for example:
machine1 will read/write files that are on the hard drive of machine2
machine2 will read/write files that are on the hard drive of machine1
machine3 will read/write files that are on the hard drive of machine1
machine3 will read/write files that are on the hard drive of machine2
etc etc...
all of this reading/writing will be done through the terminal, and programatically. rather than SSHing into a machine to read/write files from it, I'd be happy to set up some 'conventions' on how to access hard drives of various machines. for example:
'hdd1' will refer to the hard drive of machine1 (that has the static IP of 192.168.0.1).
'hdd2' will refer to the hard drive of machine1 (that has the static IP of 192.168.0.2).
'hdd3' will refer to the hard drive of machine1 (that has the static IP of 192.168.0.3).
etc etc...
this way, when I want to read/write a file, its PATH will be something like ~/hdd1/myfile.txt; ~/hdd2/anotherfile.txt;
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Feb 21, 2011
Today I have tested the networks at several schools in the area,and at the town hall. It is not possible to surf on www on any of these networks using a PC running Linux. My conclusion is that there has to be some kind of filtering of traffic that exclude PC's running Linux. From the same PC I can send and receive email, I can ping and trace (mtr) addresses on www, and I can view webpages that are on servers on the inside of the filtering-gateway. The filter used is InterScan Web Security Virtual Appliance from TrendMicro
I have also demonstrated for the admins at the town hall that using Linux-PC on a "clean" network, surfing is no problem. By doing these small tests I have demonstrated that Linux is not the problem.
Tomorrow I'm going to visit the network providers admins, so that they could see what happens when a PC running Linux tries to access www. What kind of things should I test to document, or find the problems? So far I have just used MTR to document slow respons, wget --no-proxy to document that www hangs and ends time out, ifconfig to show NiC settings, and route.. Could this be a problem with /etc/resolve.conf?
The network provider is the same company that refused to turn on IMAP on the exchange servers, resulting in 3 week without mail at our school. All the other schools had to upgrade Outlook in order to connect to the new exchange-server with MS MAPI settings. MS Gold partners are so nice...
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Feb 21, 2011
I have tested the networks at several schools in the area,and at the town hall. It is not possible to surf on www on any of these networks using a PC running Linux. My conclusion is that there has to be some kind of filtering of traffic that exclude PC's running Linux.
From the same PC I can send and receive email,I can ping and trace (mtr) addresses on www, and I can view webpages that are on servers on the inside of the filtering-gateway. The filter used is InterScan Web Security Virtual Appliance from TrendMicro I have also demonstrated for the admins at the town hall that using Linux-PC on a "clean" network, surfing is no problem. By doing these small tests I have demonstrated that Linux is not the problem.
Tomorrow I'm going to visit the network providers admins, so that they could see what happens when a PC running Linux tries to access www. What kind of things should I test to document, or find the problems? So far I have just used MTR to document slow respons, wget --no-proxy to document that www hangs and ends time out, ifconfig to show NiC settings, and route...
The network provider is the same company that refused to turn on IMAP on the exchange servers, resulting in 3 week without mail at our school. All the other schools had to upgrade Outlook in order to connect to the new exchange-server with MS MAPI settings.
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Jan 18, 2010
I've set up a FTP server, but now I would also give the ability to users to access file through a web interface, like the ones you can find in many NAS.I there anyone that knows a software that do this? I can't find nothing useful.
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Mar 25, 2010
I am developing a program which can access the SATA-hard disk. I have to use the /dev/sda interface for accessing the hard disk. What are all the commands i can use to perform the sector read, write (Both DMA and PIO), sending the smart commands etc. Or is there any easier way?
I saw that i can make use of hdparm call for getting some of the attributes.
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Feb 16, 2011
I'm using Ubuntu 10.10 since 2-3 weeks. First I tried live CD and the OS seems to be very good. So i installed it on my laptop.So far i had no problems until I tried to access the shared network folders of my Server running on MS Windows Vista and another trial PC running WindowsXP. I'm trying to solve this since 2-3 days, I haven't found a solution.1st of all my network works fine. All computers can ping each other and as the laptop had Windows XP installed the server was accessable.1st I installed the SMB4k tool with this program. I could see the computer names, but as soon as I select a Windows computer the tool searches and nothing happens.
I tried a lot of different variations of this command but in the end I receive this kind of error. I also tried to add -o user=username pass=password, nothing changed.After this I searched information about this error, some forum threads I googled are telling the SMB4K tool modifies the /etc/sudoers file and cause this error. So i tried to change it back with some kind of sudo chmod 0640 etc/sudoers but this won't work it seems I can not modify or edit thisw file using sudo.With the pyNeighbourhood tool I could only see my Laptop but not the Windows PCs.At the end I will install Linux systems on all of my PCs, but only if all my tests will pass .
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May 5, 2011
Using my laptop, I'm trying to get onto the local library's wireless network, with zero results so far.Basically, I can see the network, but when NetworkManager tries to connect it just spins for a few minutes and then rejects the connection. (Or the connection is rejected by the router) My wireless connection works fine when connecting to my WPA home network.
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Mar 29, 2011
I'm having all sorts of problems connecting an access point to my computer, but here is one piece that I hope will get me going, if I can get it solved.My computer has two network interfaces, eth0 and eth1. eth1 connects to the cable modem and thence the world, and works fine. eth0 is supposed to connect to the access point over a private network. Here is the output from route with my IP address blotted out:
Code:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
[code]...
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Jul 30, 2010
If I have set up 2 network interfaces on a box, if I started sending multicast traffic, it will go out through both interfaces? Or is there a way to control through which interface it will go out?
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Mar 22, 2010
I've got a problem while accessing the /etc/sysconfig/network-scripts/ifcfg-wlan0 file, CLI's throwing: "Stale File Handle" - there's no access to this file. Problem is the same regardless wlan0 interface is up or down.
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Jul 3, 2010
I have two simultaneous active mobile connections through my two mobile phones and USB data cables. Yet I can only send/receive with one connection.Each of the phone modems have a node in /dev, namely ttyACM0 and ttyACM0. So the modems are detected correctly.After setting up two dial-up connections with the two modems I have two ip's. Ifconfig-a confirms this:
ppp0 Link encap:Point-to-Point Protocol
inet addr:10.10.219.60 P-t-P:10.6.6.6 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
[code]....
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Sep 9, 2009
How to figure out why there are errors on bond0(eth0)
Transfer speed is in KB
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Oct 27, 2010
I've searched the forums (250 thread limit) for a fix on this, but all the questions seem unanswered or unrelated. My situation is this: I'm running Ubuntu x64 10.10 'Maverick'. I have a cablemodem connection for my Internet access. I have home network running on DD-WRT with the dreadful Linksys WRT54G series router.
My DD-WRT router is 192.168.1.1, subnet 255.255.255.0.
My Linux box is 192.168.1.61, subnet 255.255.255.0.
I have a VyprVPN connection set up successfully on Linux. Mostly everything works great, speed's fine, latency is what I expect it to be. Except... I also run an SSH server to remotely admin the box at port 22, an Apache server running over SSL at port 7001, and a Transmission web client at port 7002 (only secured by basic HTTP realms auth). All of these things worked before I got the VPN working, I'm of course using NAT at the DD-WRT router.
The endresult I am looking for, is to have the security and protection of the VPN (even if it's only perceived) for everything I do on this machine -- EXCEPT on Apache, the Transmission web panel, and the SSH server, which I want to access from the outside world. I have no firewalls running or configured, not even iptables, not even the SPI firewall on DD-WRT. All connections to the aforementioned services from the outside world timeout coming in to the Linux box. They all work from inside my home network (182.168.1.0/24). In case it's needed, he's my routing:
[Code]....
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Sep 6, 2009
I'm a newbie on Linux and trying to find my feet so please be kind.I have installed vmware on my XP laptop and have installed fedora core 9. Network setting on the VMware is set to bridged. My interface eth0 which is using the wireless does not start on boot. I have to run ifup ifcfg-eth0.The file ifcfg-eth0 had onboot=yes and NM=no, so i changed it so that the NM=yes.However this does not resolve the problem at all. I have put the file back to its original configuration and I have disabled network manager and have had no luck
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Jun 18, 2010
Showing my ignorance, but why would this work
address 172.16.1.8
netmask 255.255.254.0
network 172.16.1.0
broadcast 172.16.2.255
[Code]....
Notice the 2 in address. Seems to me it doesn't like the network and wants it to be 172.16.0.0, but I am adding to a network already configured this way.
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Oct 6, 2010
I am trying to get my ethernet adapter list to make some sense. This is what ifconfig spits out
Code:
agarzon@euler:~$ ifconfig
eth3 Link encap:Ethernet HWaddr b8:ac:6f:3b:f4:4f
[code]....
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Jun 17, 2011
Is there any way in a machine with 2 (or more) network devices to only allow 1 program to use interface1 and force all other programs to use the other?
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Apr 20, 2011
i have ubuntu 10.10 and i want to configure my interface eth0 with the commande line with owner (not the Root)$ifconfig : this commande works and listed all interface with some description -> thats goodbut when i use some parametre like @ip and netmask
$ifconfig eth0 10.10.10.1 netmask 255.255.255.0
SIOCSIFADDR: Permission denied
SIOCSIFFLAGS: Permission denied
[code]...
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Feb 10, 2010
I installed Fedora 12 on an Eee PC 1001HA. This laptop has a Ralink RT3070 wireless chipset, for which the driver is not yet in the kernel (still in staging I believe). However I downloaded the driver, compiled it, and installed it. AFAICT, it works fine.
One small obstacle remains: I am uable to get the network interface to come up automatically; I have to run # ifconfig ra0 up. Because of this NetworkManager never sees the wireless interface, making connecting to WAPs a chore.
I created a ifconf-ra0 file in /etc/sysconfig/network-scripts, and it includes the line ONBOOT=yes, but this doesn't do the trick.
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