I 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 RepliesI 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 Relatedwhere transmission stores it's data. i've looked all through my home folder and can't seem to find it.
View 3 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 can only access the Transmission web interface while the Transmission-gtk client is running. When I close it, the web interface is no longer available. I try to manually start the transmission-daemon, but the process never shows up as running.
View 2 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
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I 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 Relatedi download a lot of movies and i use *******.com and ********.com. i want to port forward my transmission, how do i do that?
View 1 Replies View RelatedNow I know how to set up port forwarding on a router so this is not that. What I want to do is, if possible, connect from Computer A to computer B and use computer B as a proxy for all of the Transmission (bit torrent) connections. I know how to do this with DNS, Http, etc etc but I'm not quite sure how to go at this with torrenting.Note that in this case Computer B is a ubuntu 10.04 server with an SSH server but no torrenting program installed.
View 1 Replies View RelatedIf I'd added blocklists from [URL] the same ones used by IPBlock (bar a few) would it be futile to use IPBlock too?
View 1 Replies View RelatedTransmission says my port is closed. If I google the problem, it just gives me advice on how to open a port in Windows OS. There's no firewall in Ubuntu 10.10 by default, right? There isn't any router used neither. I'm living in a dorm. I just plug the LAN cable in the box fixed to the wall.
View 3 Replies View RelatedEvery time I use Transmission for torrent download it throttles my Internet connection although I set speed limits way below my bandwidth.
View 2 Replies View RelatedI 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 RelatedEverytime I use Transmission for torrent download, even if I only have a single torrent, my firefox is unable to access the internet. I assume this cannot be a bandwidth problem, so what is it.
View 5 Replies View RelatedWhen I start downloading torrent via transmission, utorrent, deluge every time I get disconnected network which can be fixed with restarting DSL modem, I've never had the problem in Win7 an WinXP.
View 8 Replies View RelatedI 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 RelatedIn 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 RelatedI 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.
I have just set up the transmission bittorrent client on my server (using the web interface), and am trying to get the port forwarding right. After noticing low download speeds (and rare uploading), I decided to check if a port needed to be forwarded.
I found many conflicting sites, mentioning both the ranges 6881-6999 and the port 51413 (as well as TCP and UDP versus just TCP). My current configuration is to forward TCP and UDP port 51413 to my server.
I 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 Relatedhow 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
How can i send udp packet to the DNS using netcat in opensuse.
View 7 Replies View RelatedI 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.
I 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?
I 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.
Code:
Internet ---> Tap A--> Traffic Monitor
B--> Firewall --> Internal Network
I was hoping to make a server with Windows and "Colasoft Capsa" to capture and record all traffic. Is there a way to make it unaddressable so that I don't have to worry about someone getting into it? Like, put it in promiscuous mode, read and capture all traffic, without having an IP address or something like that?
Does udp use Packet Sequence Number?
View 2 Replies View Relatedit's one of the first time I'm using linux! For a report I have to answer to the question (the title) but it's very strange! A packet has an ip address? or does it referer to the IP address of the destination? And in particular this is the output of tcpdump -en ip proto 1 (while I'm sending ping -sv remote_machine)which are:
What are IP and Mac andress of a packet that went from my machine to the bridge? and what are the IP and mac of a packet that went from the router to my partner's machine? And how could i find the average delay that a packet experience in the bridge?
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