Networking :: How To Send Udp Packet To The DNS Using Netcat
Jun 16, 2010How can i send udp packet to the DNS using netcat in opensuse.
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Ubuntu Networking :: Send The Keys Or Value As The Packet Data (content Of The Packet) In Ns-2 (for Wireless Environment)
Jul 12, 2010I 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 RelatedGeneral :: WOL - Send Magic Packet?
Apr 1, 2011As 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 RelatedProgramming :: Send A Packet Through Sockets C++
Feb 1, 2011Can someone help me with this problem,trying to send a packet,using tcp/ip,the packet should look like this:
Code:
field 1: SOCKS protocol version, 1 byte (0x05 for this version)
field 2: status, 1 byte:
0x00 = request granted
0x01 = general failure
0x02 = connection not allowed by ruleset
0x03 = network unreachable
0x04 = host unreachable
0x05 = connection refused by destination host
0x06 = TTL expired
0x07 = command not supported / protocol error
0x08 = address type not supported
field 3: reserved, must be 0x00
field 4: address type, 1 byte:
0x01 = IPv4 address
0x03 = Domain name
0x04 = IPv6 address
field 5: destination address of
4 bytes for IPv4 address
1 byte of name length followed by the name for Domain name
16 bytes for IPv6 address
field 6: network byte order port number, 2 bytes
and this is my code:
Code:
int domainLen = strlen(domain);
char reply[domainLen + 7];
reply[0] = 5; // version
reply[1] = 0; // succed
reply[2] = 0; // reserved
reply[3] = 3; // its a domain
reply[4] = domainLen;; // lenght of domain
for(int j = 0; j < domainLen; ++j)
{
reply[j + 5] = domain[j];
}
reply[5 + domainLen] = 80; // port
reply[20] = '�';
Send(reply, sizeof(reply));
domain is "www.google.com". Am I doing it right ? I dont know much about bits.
Red Hat / Fedora :: Determine Network Interface That Will Be Used To Send Packet For An IP?
Apr 9, 2010I'm writing to you because I encountered the following problem. My program displayes all network interfaces that are available in the system, but I would like to adda functionality in which a user can enter a destination address IP (ex. the IP address of the Google search engine) and will get information which network interface will be used to send it. As I know it is associated with reading information from routing table in the system. Maybe you know the API (functions/methods) which I could use to do it in RedHat ? I program in C/C++, but if you know how to do it in other programming languages (Java, Perl, Python) I will be grateful for any information.
View 4 Replies View RelatedProgramming :: Send A UDP Syslog Packet With Source Port Set To 514
Jan 25, 2010I am trying to generate a UDP syslog packet from my C application. But I am facing a problem with a Cisco Router ACE that does not like the Source Port being '0' and thus drops the packet.How can I specify the Source Port in the UDP header to '514' as stated in RFC3164 (Section 2: Transport Layer Protocol)? "It is RECOMMENDED that the source port also be 514 to indicate that the message is from the syslog process of the sender"
View 1 Replies View RelatedGeneral :: Kernel Crashed When The Module Tries To Send IPv6 Packet?
Oct 10, 2010I 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]...
Programming :: Perl - UDP Server Receive / Send Packet To Host
Apr 1, 2010I have found many examples out on the www for creating udp servers with sockets. The problem I am running into is after I receive the packet from a host I need to be able to send a custom made packet(I'm using RawIP / NetPacket to make my packet) back to this host. The only way to do this is seemingly through the send() function. This function however doesn't appear to allow me to specify which host to send my packet to.
View 2 Replies View RelatedGeneral :: Root Privilege Required To Send A Wake-on-lan Magic Packet?
Sep 28, 2010On 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 RelatedNetworking :: OpenSuSe 11.4 - How To Ping DNS Using Netcat
Jun 15, 2010I am new in linux. I am using opensuse 11.4. How can I ping a DNS using netcat?
View 6 Replies View RelatedNetworking :: UDP - Stop Netcat Connecting?
Dec 9, 2010I'm wondering if I can use netcat to listen to a UDP port and display ALL incoming packets, no matter where they're from. If I just do 'nc -u -l 1234' then netcat will listen for incoming packets and connect() to the source address of the first one it sees (I can see this with strace). Is there any (standard) way to stop the connect() call? I can make a hack to block connect() with a function of my own, but that'd be ugly
View 6 Replies View RelatedFedora Networking :: Connecting To Server With Netcat
Jul 10, 2009I connected two machines, I have their given of the addresses ip in a static way and not with DHCP. I gave to the machine server the address: 192.168.0.1, and in the machine client the address 192.168.0.2.
View 5 Replies View RelatedUbuntu Networking :: Netcat Doesn't Seem To Work
Jul 27, 2010I've tried to use netcat in the past and assumed it was my stupidity that was preventing it from working... but this is getting ridiculous. I'll execute nc -l 3333 on a server at 192.168.0.105 (after opening it on the firewall of course) then I run nc 192.168.0.105 3333 on my laptop (from 192.168.0.101). and nothing happens... i start typing and nothing comes up on the terminal.
I run nc -z 192.168.0.105 80 which should ideally do a port scan of port 80 on that server (of which I'm running a web server that clearly works) but it doesnt even give me any feedback. Nothing happens. Now when I use the verbose flag i see that I am indeed connecting to the specified port on the server successfully (so the port scan one is a success but only with the verbose flag... which shouldnt be the case I believe). But still once I have the server listening and the laptop connected... I type in both windows and nothing happens...
Networking :: Relay UDP Broadcast Using Netcat/Socat?
May 7, 2010Here is my problems :I have two networks :1. LAN (10.1.x.x subnet 255.255.0.0), and2. my internet public (IP 202.xx.xxx.xxxx subnet 255.255.255.240)I have an application in my LAN PC (10.1.2.240) which broadcast udp packet to its client. The client in my LAN can receive the udp packet, no problem.My question is how netcat/socat can RELAY the udp broadcast packet to one of my IP public address so the message can be received by other client from internet ?
View 5 Replies View RelatedNetworking :: Use Netcat As A Bridge To Connect Two Server?
Apr 11, 2011i have 3 servers in 2 dcs as follows; server 1 (dc1 - dmz) --- server 2 (dc1 - internal) --- server 3 (dc2 - internal) Now I have an application in server1 that have to connect to port 44000 in server 3 but dc refuse to open connection saying they do not open connections between dmz and dc2 (i have no say over this).
However I can connect to virtually any port from server1 <-> server2 and also server2 <-> server3. Is it possible to do something like;
server1 <-> server2 <-> server3:44000 using nc to get the app work.
Networking :: Using Netcat To Make A Simple Proxy?
Nov 21, 2010I made a simple proxy using netcat and it works great, the idea is to make the server and client communicate through two named pipes, file1, file2.
$ mknod file1 p
$ mknod file2 p
$ nc -l -p 12345 0<file1 1>file2 &
$ nc 192.168.2.118 80 1>file1 0<file2 &
The problem Im facing is that I cant seem to intercept the data going between the client and the server. I want to be able to have the data coming to the server in a variable, manipulate it and send it to the client, and the other way, have the data coming to the client in a variable, manipulate it and send it to the server.
Im running on an embedded device where tee, awk and many other commands are absent. how can I redirect the data to a variable, manipulate it and pass it to the other side, that is the question.
CentOS 5 Server :: Authenticate/Decrypt Packet Error: Packet HMAC Authentication Failed
Sep 17, 2009I 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]....
Ubuntu Networking :: 9.10 Updates Yesterday/Today Cause Packet Loss On Networking
Apr 9, 2010I have 3 Dell Precision M4400 machines. After getting updates yesterday or today, I get random network dropouts like crazy, on wired or wireless. On one machine I was able to turn off ipv6 in grub and reboot, and it works now. However on the other 2 machines, still have the same problems. All 3 are running 9.10 64 bit. Is there a way I can back out the updates so the network works again? Anyone else see this behavior after updates today?
View 2 Replies View RelatedNetworking :: Packet Spy On A Hub
Jan 25, 2011I 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 RelatedNetworking :: DNAT On First SYN ACK Packet
Aug 19, 2010I 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.
Networking :: DNS Raw Packet Structure?
May 19, 2010My 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.
Networking :: Packet DETECTED From 1s And 0s?
Jan 11, 2011From 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 RelatedNetworking :: Udp Packet Conflict ?
Jul 28, 2011In application udp port listening with 3330 i am sending udp request from port 0.0.0.0:3330 to 0.0.0.0:3330 that is same port in the same machine....application works fine udp sending and receiving also fine.....for clarification ....is there any conflicts in the communication ?
View 2 Replies View RelatedNetworking :: Odd PPPoE Packet Redirection Networking?
Feb 7, 2010I have a machine with two network cards running linux mint 8 XFCE (which is compatable with Ubuntu Intrepid Ibex). eth0 gos out onto the network propper, has a static IP address of 10.10.10.10 and serves DHCP requests for the 10.10.10.x subnet.
eth1 is pluged into a PPPoE concentrator, and has a static address of 192.168.0.1 (I would have left it alone but pppoeconf wouldn't work unless it had an address).
ppp0 is the piont to piont over ethernet conection that is corectly created when I run pon. I have both guard dog and guide dog installed but they are both disabled.
Now, the weird part: I can ping the IP number of the machine at the other end of the pppoe conection (when it changes I can still ping the new number), the local IPs (10.10.10.x), but *nothing* else not even the DNS servers passed to the machine during ppp conection which are in the same sub net as the machine I can ping.
When I try to ping or trace the route I get an error message like: reply from 10.10.10.10: desination unreachable There is nothing wrong with the network at the other end, as I can make an Identical PPPoE connection from other machines on the network if the the concentrator is pluged into the hub (a rather unsafe place for it to be) and it all just falls into place.
What seems to be happening is that the machine is treating eth0 rather than ppp0 as the internet gateway, and passing the packets round in circles.
Fedora Networking :: Receving UDP Packet In 12 ?
Feb 27, 2010I wrote a program for transmitting an UDP Packet. It is properly received in Fedora core 2 machine while its not received properly in Fedora 12. I tried using Wireshack packet capture software which shows the protocol as DIS. Is there any service or setting i need to do for identifying the packet as UDP.
View 2 Replies View RelatedNetworking :: Identify The Icmp Packet?
Dec 1, 2010how to identify the icmp packets & marking. this below icmp packets marking is not working.
iptables -t mangle -A PREROUTING -p icmp -j MARK --set-mark 0x5
iptables -t mangle -A PREROUTING -p icmp -j RETURN
with the help of port no or any other how can i identify the icmp packet ?... This below two is working fine
iptables -t mangle -A PREROUTING -p tcp -j MARK --set-mark 0x2
iptables -t mangle -A PREROUTING -p tcp -j RETURN
iptables -t mangle -A PREROUTING -p udp -j MARK --set-mark 0x3
iptables -t mangle -A PREROUTING -p udp -j RETURN
Networking :: Data Packet Transmission In A LAN?
Jun 24, 2011I need to know how a data packet is transmitted from the sender to the receiver passing through the five Internet layers. Specially what device (hardware) the data packets have to pass through at each layer before reaching the destination in a LAN.
View 2 Replies View RelatedNetworking :: Monitoring TCP Packet Loss In NS2 ?
Jun 23, 2010I am simulating a TCP/FTP to TCP/FTP network and trying to monitor the packet loss.
I am able to monitor and graph data regarding the TCPSinks' bytes received, but I can't monitor packet loss.
Why is it that the TCPSink Agent has a variable for bytes (bytes_) but not one for monitoring packet loss?
Do I have to monitor the packet loss from the queue? If so, how do I write code for this?
Below is part of the code for monitoring bytes received from sinks if anyone was interested.
Networking :: Packet Forwarding Using IPtables?
May 4, 2011I have 2 Ubuntu boxes sitting in the same subnet; server 1 [130.15.6.68] and server 2 [130.15.6.69] What I am trying to achieve here is the following: server 1 act as a gateway or proxy to server 2, meaning that server 1 is exposed to the Internet and all traffic to server 2 should go though it (i hope!).
server 2 act as application server and I don't want a direct access to it from the internet. I want all the inbound traffic comes through server 1. for testing purposes, i will limit the traffic to simple http or port 80
in server 1, i have done the following settings: iptables -t nat -A PREROUTING -p tcp -i eth0 -d 130.15.6.68 --dport 80 -j DNAT --to 130.15.6.69:80 iptables -A FORWARD -p tcp -i eth0 -d 130.15.6.69 --dport 80 -j ACCEPT In server 1, I've edited the value of net.ipv4.ip_forward to equal 1 (uncomment that line in /etc/sysctl.conf) Currently, both server 1 and server 2 has its own apache2 servers with different index.html files. the problem is, when i browse to server 1, I am still seeing its index page rather than being forwarded to the index page of server 2. how can i achieve the traffic forwarding from server 1 to server 2 when my browser pointing to server 1?
Networking :: Packet Redirecting To Another Interface Of The Box
Nov 19, 2010I have to interfaces eth0(10.0.0.7) and wlan1(10.0.0.8) in my box. An application is listening (say, udp socket) at 10.0.0.7:5888.
Now if someone sends packet at 10.0.0.8:5888, I want to forward them to 10.0.0.7:5888.
I have tried this - iptables -t nat -A PREROUTING -p udp --dport 5888 -d 10.0.0.8 -j DNAT --to-destination 10.0.0.7
But Packets(with destination addr 10.0.0.8) are not received by the application (But they are received by the box, I have checked using wireshark). I have also enabled ip_forwarding.