General :: Modify Network Protocols - TCP In Particular
Aug 10, 2009
I m pretty new to Linux..! I've been given a task to modify network protocol(TCP in particular). So now i've to make few changes to the kernel which includes modifying few source files. So i want to know how can i go abt it. Till now i've explored various .c files of kernel(Eg.tcp.c,tcp_input.c etc etc)by referring few books. And now comes the important part of implementing it. So how exactly can i go abt it?? I went thru various threads like installing a kernel,compliling a kernel and other things. But i m not getting the exact sequence in which i should do it. I've installed fedora 10. But i cannot see any source files which i can modify. Where and how can i modify these files?
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Aug 16, 2011
I want to connect my Debian Squeeze machine to my school wireless network with wpa_supplicant.
I think the network uses 802.1X authentication, because when the other students connects to the network for the first time in Windows they enter their username and password then the connection is established. I have asked the the IT staff but they do not known what 802.1X, PEAP EAP etc. is and just say "Enter the login details in the box!".
If I bring a Windows 7 machine to school and successful connects to the network, is it then possible for me to extract the information [and extract a certificate if used on the network] from Windows somehow so i can setup the wpa_supplicant.conf correctly on Debian?
The information I want to extract is which protocols are used, like PEAP,MSCHAP etc.
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Sep 6, 2010
I need to monitor network performance/usage based on protocols.
About snort now, is perfstat.c is replaced with some thing else?
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Apr 10, 2009
How to implement Network Protocols.
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Nov 12, 2010
anyone know network packet editor for Linux? or modify network packet in wireshark?
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Aug 27, 2009
I was having a discussion with someone who said that telnet, FTP, HTTP plain-text authentication in the local subnet is ok because it's a switched network. Also, that these protocols are not good over the net but in a local subnet they are just fine.
I know that someone can plug a hub in the network port and connect 2 (or more) PCs and see the packets. Also, heard about ettercap but haven't really delved into it. I know dsniff was written to prove the point that unencrypted protocols are bad. Would like to get opinion about unencrypted protocols over a switched networks.
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Aug 5, 2010
Currently I have 2 Lan card in My System one for communicate client pcs (Lan card Ip 192.168.1.100) and other for Internet (Lan card ip 192.168.0.100.) All client pcs are in 192.168.1.0 Subnet
Here i implement my system as router through iptables all clients are communicate through only 192.168.1.100 (clients default gateway also 192.168.1.100) Now no problem for forward rules when my system is active all clients are get internet.
Now i have problem with blocking UDP protocols i tried lot of things in net iptables -A INPUT -s 192.168.1.0/255.255.255.0 -p UDP -j DROP
But it's not blocking UDP protocols (i change UDP to ICMP Protocols then icmp is blocked every ip address)
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Feb 16, 2010
What printing protocols are supported by CUPS?
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Apr 12, 2010
So I am looking to modify my network cards MTU (for some testing purposes), and I only know how to do it it Windows (via command prompt ping command with special flags) and not in Ubuntu.
Any easy way to figure out proper MTU numbers in Ubuntu?
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Feb 27, 2011
I was saddled with the job of maintaining my department's website (I work at a college). When I still used windows I would access my department's folder on the web server using the following procedure: (in windows XP) go to the start menu > click 'run' > enter the folder address, I would be prompted for my login and password. The folder, and the whole server in fact, would then be visible in the windows file browser, under the 'networks' icon. I could then navigate to my department's folder and modify the files I need to to update the website.
How do I do this in Opensuse (using Gnome). I tried going to 'network' in nautilus and then 'open location' but no luck. I also tried 'connect to server' in nautilus (in the 'file' menu), but again no luck. which I could stomach if my college provided reliable access to computers on campus, but they don't so I have to use my laptop, which is now windows free . My current job is only going to last for a few more months, so having only so recently got rid of windows I am reluctant to re-install it just for this purpose (which is just about the only reason I currently have for using windows - the other is being able to download audiobooks from the public library, but that's another matter).
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Dec 29, 2009
Is installing "php5-suhosin" from yast and restarting apache enough to make suhosin work out of the box? Or do I need to add few lines to php.ini file and modify suhosin file?
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Feb 25, 2010
I am a under-graduate student. my prof has implemented an adhoc protocol and simulated it on some network simulation software and it worked out of box. She want to implement it on real world unix/linux systems. i am sure it is possible, but i dont know where to start from.
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Mar 14, 2011
On openSUSE 11.3 I was using remmina as a replacement for tsclient. After upgrading to openSUSE 11.4 (Did a complete new install) Remmina only seems to support SSH connections. All other protocols like RDP, NX and VNC are missing. I got FreeRDP and rdesktop etc. Installed and can connect to RDP sessions from the terminal.
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Aug 12, 2010
I have ssh running on port 22 and that is the only thing I want in/out of this particular box (ssh, scp).But when I use iptables to set the default policies for INPUT, FORWARD, and OUTPUT to DROP and then allow 22:
iptables -I INPUT -p tcp --dport 22 -j ACCEPT
iptables -I OUTPUT -p tcp --dport 22 -j ACCEPT
ssh stops working.
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Jan 4, 2011
I have setup NTOP on Centos 5.5 and am not seeing traffic that I am supposed to be seeing. We have a product that uses many different services including ssh. I have this system as a target on mirrored ports but am not seeing any ssh connections or activity when I look at the host machine that is connected to the target ssh client and vice versa. When I look under TCP/UDP Service/Port Usage it is not displaying all the services that are being used especially SSH. What could it be?
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Jan 24, 2011
Will ipv6 use the same routing protocols as v4?....such as OSPF?
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Jun 7, 2011
How to switch between serial protocols in c language? for example i need to switch between rs232 and rs422,(according to rs422 pinout)
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Jan 21, 2010
How do I get thread_info for a given pid? Is there a way to modify PC of thread A in thread B so once thread A is scheduled, it will jump to the new instruction?
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Jun 22, 2010
When we execute rm command then the target files or directories are permanently removed from our computer.
Is there any way my which when we execute rm command then the files or directories moved to Trash.
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May 13, 2010
I need to modify a file that contains \tsus.fbfs.comappsdataStormLossProduction and replace the \tsus.fbfs.comappsdataStormLossProduction line with rm -f /mnt/nfsvol/PC/SLR/
I have tried:
But it provides an error on the second . I need to change this in place and not redirect to another file.
Is this possible? I have used sed and awk before but not extensively.
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Aug 20, 2011
I am new to using wireshark and I've been browsing around the packets it a bit. I figured I'd try and use it to cut into a protocol that isn't documented, that I can find, but doesn't seem particularly secure. I tried cutting into a protocol and I turned _everything_ off, but wireshark was still picking up packets left right and centre. So I decided to stop the internet daemon and still, packets were being sent over the internet. So I decided to pick some of the IPs and do a reverse look-up. Each and every one of the IPs are of Russian origin or close.
I'm under the impression that these are unwanted packets. I've also noticed that they are sending data from the same port: 32165. Another thing I noticed while doing reverse look-ups is a lot of these IPs are hit in 'Spam & Open Relay Blocking System' and 'Project Honey Pot' which seem to be spam blockers and trackers. What I should do or what I should investigate? The reverse look-ups are only providing me with the ISP which 'owns' the IP block the IP is apart of. They are from various ISPs every time.
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Sep 3, 2010
I have project which need to stream audio to multiple remotely connected devices on internet.the best protocol for streaming with minimum or no audio distortion.
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Jun 21, 2010
Brief overview of my current setup:
Code:
The ip_blacklist chain is used to immediately drop any traffic from specified address ranges, while the tcp_, udp_, and icmp_packets chains contain rules for further processing of those protocols. The last rule in each of the latter three chains drops all packets that didn't match any rules above it; so tcp, udp, and icmp packets should NOT get caught by the default INPUT policy (DROP). The goal of the last rule on the INPUT chain is to then log any packets that are picked up by the default policy. However, it's not working.
I can tell that there are packets being picked off by the default policy because the counters are being incremented, but nothing is logged by that last rule. My conclusion is that it's only looking for tcp, udp, and icmp packets and ignoring everything else.
How to get iptables to log all the other protocols (or whatever is being caught by the default policy)?
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Mar 24, 2011
I'm attempting to write an application that needs to read and reply to messages that will appear via 3 different methods:
1) Standard serial communications
2) TCPIP over serial via PPP
3) TCPIP over Ethernet
The problem is that I'd like for the application to be able to receive packets from any and all of the three interfaces simultaneously. I shouldnt have much trouble with performing #1 and #3 at the same time, as I think I can just get a file descriptor from termios and another for a socket and then use select to wait for data. But #2 is problematic.
First I dont know how to set up a socket that uses PPP as the data link layer. And secondly, (here's the big one) this PPP data is coming over the same port that the serial data is. There's no chance for data collision, and I am guaranteed not to receive another packet until I respond to the last one (in the same protocol at that) but incoming packets may or may not be PPP/TCP/IP framed.
My app will act like the PPP client, so I was just thinking "somehow" that I could run a standard termios application on the serial port which would begin to interpret the packet. If its PPP framed then it would have to get passed to a PPP client, which would be listening to my application rather than a physical port. And I have no idea how to do that. Is there an API available that will help me with the PPP packets?
How hard would it be to write a device driver that simulates a serial port. The device can listen on a real serial port, interpret its contents to an extent, and then distribute the incoming data to multiple "virtual" serial ports, which the main application can then listen to for incoming traffic.
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Dec 29, 2010
I am going to install the newest version of Ubuntu on my computer. I am currently running Vista. I would like to be able to dual boot. I understand the whole partitioning deal and booting from the cd but i am worried that doing so will overwrite my Master Boot Record for windows. Do I need to modify the GRUB2 after installation. Read many writeups but was hoping for some input.
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Feb 22, 2010
It is very important for my research work. For example mydata.txt:
id type x y z
1 6 0.474611 0.227223 0.583947
2 4 0.422894 0.22726 0.536791
3 5 0.448963 0.200148 0.560336
4 3 0.386478 0.207721 0.515293
5 6 0.371617 0.22361 0.582206
6 4 0.32123 0.222999 0.534782
How to change second column (type) whose values are 4 and 3 to value 1, so that mydata.text file become:
id type x y z
1 6 0.474611 0.227223 0.583947
2 1 0.422894 0.22726 0.536791
3 5 0.448963 0.200148 0.560336
4 1 0.386478 0.207721 0.515293
5 6 0.371617 0.22361 0.582206
6 1 0.32123 0.222999 0.534782
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Mar 20, 2010
this is the output of df command on my system
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda8 18073924 4911628 12244184 29% /
udev 642140 308 641832 1% /dev
[code]....
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Apr 20, 2011
I have set up a local YUM repository to install own modify packages om my clients.
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Nov 3, 2010
How can I modify my grub menu? I remember that on openSuSe was /boot/grub/menu.lst. But in debian there isn't it. In ubuntu is the same for modifying grub menu?
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Jul 28, 2011
I want to use awk to modify file like this
origin:
A[]A[][]A[]A
modified:
A[]a[][]A[]A
but when I use
awk '{$2="a"; print $0}' inputfile
the output is
A[]a[]A[]A
where the [] means space. This is not what i want. I guess that is because the OFS is one space by default, but i really don't know how to solve this.
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