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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I am having some problems changing the sources.list...or am i? i not sure what's going on, Could be a permissions issue?
Details:
1.Note i have stopped #repository here to try another, the last one.
2.When i issue command from root terminal, this is result, though it does let me pull up the sources.list and edit.
3.I also have a sources.list.save /etc/apt/sources.list.save
Should that be there? It does not change along with sources.list changes made.
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.
How to implement Network Protocols.
View 1 Replies View RelatedI 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?
View 5 Replies View RelatedWill ipv6 use the same routing protocols as v4?....such as OSPF?
View 2 Replies View RelatedI 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.
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.
View 1 Replies View RelatedOn 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.
View 3 Replies View RelatedI 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?
View 5 Replies View RelatedHow to switch between serial protocols in c language? for example i need to switch between rs232 and rs422,(according to rs422 pinout)
View 2 Replies View RelatedCurrently 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)
What printing protocols are supported by CUPS?
View 1 Replies View RelatedBrief 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)?
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.
I would like to allow multi users to access P2P networks, so I wonder if there's a way to tracking these kind of protocols with netfilter, and also compatibility with nat, like the module conntrack_ftp seems to do with the FTP protocol.
View 3 Replies View RelatedI 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.
I need to monitor network performance/usage based on protocols.
About snort now, is perfstat.c is replaced with some thing else?
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.
I installed today (fresh install) the latest version of squeeze, and after installing kuser, I attempted to run the program (of course as root), so that I can start managing accounts with my preferred application. However, this is what I got when I attempted to run the program:
# kuser
QGtkStyle was unable to detect the current GTK+ theme.
Qt: Session management error: None of the authentication protocols specified are supported
kuser(3136): Session bus not found
KCrash: Application 'kuser' crashing...
sock_file=/root/.kde/socket-hostname/kdeinit4__0
Warning: connect() failed: : No such file or directory
KCrash cannot reach kdeinit, launching directly.
[Code]...
is everytime i reboot , my keyboard is reset to USA. im in canada & it pisses me off each time i need to change it also.all my options on EMESENE is the same issue always RESET.it's like if nothing keeps the changes once rebooted.
View 1 Replies View RelatedI am coming across a strange error with my gateway. When I do a "ping", this is what I get below:k-63a5b848c6cb4:~ # ping simba PING simba.gateway.2wire.net (192.168.1.69) 56(84) bytes of data.
64 bytes from k-63a5b848c6cb4 (192.168.1.69): icmp_seq=1 ttl=64 time=0.041 ms
64 bytes from k-63a5b848c6cb4 (192.168.1.69): icmp_seq=2 ttl=64 time=0.029 ms
64 bytes from k-63a5b848c6cb4 (192.168.1.69): icmp_seq=3 ttl=64 time=0.023 ms
[code]....
I'm doing some simulations (using Iperf) to obtain throughputs values of a link between two gigabit ethernet cards for different delays and different drop probability (using netem) .... Now I have to do a 3minute long simulation in which during the firstnute the bandwidth is 1000Mbit/s, 500Mbit/s during the second minute and 1000Mbit/s during ththird one....Does anybody know how can i do this type simulation
View 4 Replies View RelatedI have a small pc running fedora 8 with iptables and 2 network cards for routing/firewall and secondary DNS.For some time I've been alerted by the network guys that this machine was generating some alerts. The real network IP address keeps being assigned to the other interface, intended for LAN only (10.0.0.1/24).I've already changed the PC, installed a more recent operating system, replaced the 2 network cards and the problem persists. I have another pc running the same services (except DNS) in a very simillar way and no alert logs from that one.onder if it is some configuration issue on my startup firewall script.I've also installed arpwatch and I could confirm this IP and physical address issue:
Arpwatch output:
hostname: my.host.name
ip address: my.ip.address
[code]....
I often run "gulp", a networking utility, to capture data from an instrument on "eth1". By default gulp must be run as root to have access to the ethernet port, and when I'm the only one running it, that's fine. But I need to let several other users to capture data and don't want to give them all sudo permissions for both gulp, and more importantly, 'chmod'. Is there anyway to change the permissions of eth1 to allow all users to open it and avoid sudo entirely? This is on a Red Hat/Fedora machine.
View 1 Replies View RelatedI'm running Ubuntu server. To change the IP while I'm sitting in front of the computer, I would:
1. edit /etc/network/interfaces
2. ifdown eth0
3. ifup eth0
Remotely, I can do the first two no problem, but the ifup command causes some problems since the ethernet interface is no longer functioning. Is there some kind of script that can be written for this purpose? Maybe something that will check eth0 every so often and make sure it is running and bring it up if it isn't. Or else a script run with nohup?
I do not intend that changing the IP address will be a frequent occurrence, but when it needs to be done, it must be done reliably and without the possibility that the computer will no longer be reachable for more than a couple minutes or so.
I am coming across a strange error with my gateway. When I do a "ping", this is what I get below:
k-63a5b848c6cb4:~ # ping simba
PING simba.gateway.2wire.net (192.168.1.69) 56(84) bytes of data.
64 bytes from k-63a5b848c6cb4 (192.168.1.69): icmp_seq=1 ttl=64 time=0.041 ms
64 bytes from k-63a5b848c6cb4 (192.168.1.69): icmp_seq=2 ttl=64 time=0.029 ms
64 bytes from k-63a5b848c6cb4 (192.168.1.69): icmp_seq=3 ttl=64 time=0.023 ms
64 bytes from k-63a5b848c6cb4 (192.168.1.69): icmp_seq=4 ttl=64 time=0.015 ms
Does anyone know what the problem could be?
I've 3 hosts images installed in virtualbox, that every time I reboot an image, the ip address change.
The 3 images are ubuntu.
I would like to configure these images in a way that, every time I reboot the images, I can access them by the name, and not by the ip.
I have a proxy tunnel server which the client connects trough SOCKS protocol, for ex: he opens a ssh window "ssh -D 1070 server.com" and set his connection to SOCKS v5 on 127.0.0.1:1070.I want that, when someone uses the proxy, the external ip the persons gets to be random, not always externalip1! Or... if he uses externalip2 to connect on ssh, his externalip should be externalip2. I don't want every user with the same external IP.
View 1 Replies View Relatedi met an tough problem and now still cannot solved it. it is a problem about QT,below is the information. Session management error: None of the authentication protocols specified are supported
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