Fedora :: How To Enable Multicast Forwarding

Jul 22, 2010

I have a server that sits between two LANs, and I wish to enable multicast routing from one LAN to the other. I have multicast routing enabled in the kernel but didn't know how to enable it. Tried to add mc_forwarding in /etc/sysctrl but doesn't work.

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Fedora Networking :: How To Enable Ipv6 Forwarding

Jun 2, 2010

Okay I have searched how do I enable ipv6 forwarding?

There is no ip_forward in /proc/sys/net/ipv6/

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Fedora :: Prefer To Work Over SSH And Enable X Forwarding

Jun 7, 2011

I installed Fedora 15 to my server. I preffer to work over SSH and I enable X forwarding. My configurational file:

/etc/ssh/sshd_config:
X11Forwarding yes
X11DisplayOffset 10
X11UseLocalhost yes

From my laptop I run next commands

ssh -X user@xx.xx.xx.xx
startx

and the session start on server, no redirect occur. Next output I saw in terminal

[Code]....

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Networking :: How To Enable Ip Forwarding

Jun 2, 2010

We have on Ubuntu 10.04 LTS installed on one m/c which is connected to office network using pptp vpn.Now i want to enable ip-forwarding on this m/c so that i can connect my RH9 m/c through this. For enabling ip forwarding i did the basic thing "echo "1">/proc/sys/net/ipv4/ip_forward" And added route on the RH m/c as route add -net 10.254.254.0 netmask 255.255.255.0 gw 192.168.1.10 dev eth0" (IP of Ubuntu m/c is "192.168.1.10 and RH m/c is 192.168.1.15) But some how ip-forwarding is not working properly.

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Networking :: How To Enable Ipv6 Forwarding

Mar 26, 2011

I would like to enable ipv6 forwarding . i have ipv6 module loaded.I added net.ipv6.conf.all.forwarding=1 in /etc/sysctl.conf .i tried reboot , did 'service network restart' .

.
Also I tried
sysctl -w net.ipv6.conf.all.forwarding=1
and

[code]....

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Software :: Enable X11 Forwarding If SSH Directly Into The System?

Mar 15, 2011

how to enable X11 forwarding if I SSH directly into the system, for example:

ssh -X server1

However, I'm trying to get X11 forwarding on a system I don't have direct access to. I need to first SSH into a server I do have access to, server2, then from there I can SSH into server1. I know about port forwarding but I'm not sure how it works with regards to forwarding X11 windows. For port forwarding server1's web page, I'd do this: ssh -L 9999:server1:80 mylogin@server2

Then opening [URL] on my computer would bring up server1's webpage. What is the equivalent SSH command for X11 forwarding so if I typed it and executed gedit for example, that program from server1 would pop up on my Desktop?

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Ubuntu Networking :: Enable Port Forwarding So Can Use Computer As A FTP Server?

Oct 3, 2010

I'm trying to enable port forwarding so I can use my computer as an FTP server to some friends. Here's my setup:

CLEAR wireless modem <--> LAN port 4 on router (not WAN) and LAN port 1 on router <---> eth0 in Ubuntu 9.10

The modem acts as a DHCP server which successfully assigns an IP address to my desktop system. I can also go onto the internet just fine on my desktop, and any other computer that connects to the router.

I have enabled port forwarding on the modem (not the router because it's being used as a switch, and not using its WAN port) to forward ports 21 and 80 to my desktop. What I don't understand, though, is that when I try to FTP to the modem's WAN IP address, the connection is refused. However, when I use websites such as:

www.canyouseeme.org
www.yougetsignal.com/tools/open-ports/

They say ports 21 and 80 are open (and not other random ports like 22 or 23 which I tried to see if the site simply said everything was open) but I cannot access my site from a web browser.

I was wondering what it was that's stopping computers from the Internet from communicating with my computer? The modem? The router? Configs?

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OpenSUSE Network :: Enable IP Forwarding While NetworkManager Handle Internet Connections?

Jan 30, 2011

I want to share my WiFi internet connection over LAN, so I'm trying to set up IP forwarding. An old tutorial tells me to go to Network Settings in YaST to do this, but that applet says that NetworkManager is now handling all of that stuff.How do I enable IP forwarding while NetworkManager handles my internet connections?

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Fedora :: Any Tool To Record UDP Streams (multicast) In 10 ?

Oct 26, 2009

finding a tool to record udp:// streams that are multicasted.

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Fedora X86/64bit :: 14 Cannot Play More Than 1 Multicast Stream

Aug 17, 2011

I have a project to run simultaneously up to 8 video streams, from a pool of about 100 multicast cameras, and display them on 4 monitors. The PC I am using is a brand-new dual CPU 4-core Intel Xeon E5620 2.40GHz, Intel S5520SCR motherboard, 8GB memory and nvidia Quadro NVS 450 graphics. It's running Fedora 14 64-bit and outputs on 2x2 LCD monitors using Xinerama. So far, so good.

Playing a single video stream from any camera works fine. The problem is that, when I open a 2nd media player window with the purpose of playing other camera, all those two video windows play a single stream. It doesn't matter which camera stream I opened first, as soon as I open a 2nd stream, both windows show the same stream (either the first, or the second, at what seems to be a random choice). Further, a 3rd or a 4th video window will also play the same stream. In other words, one stream sort of "contaminates" all the other streaming windows to play that particular stream only. The problem remains the same even when the following changes are applied:

- graphics driver: nvidia or nouveau;
- video player: vlc or mplayer;
- number of active monitors: 4, 2 or 1.

I am really puzzled because, on the same computer, Windows XP SP3 32-bit runs beautiful. I can smoothly play up to 12 video streams and some computer applications, simultaneously. I cannot believe that an obsolete OS such as Windows XP can outperform by a long shot Fedora 14 64-bit in video streaming projects. Just doesn't make sense.

Note: I have also tested Windows 7 64-bit, it also runs multiple video streams in parallel without any problems, but Win 7 has issues that XP is free of (such as graphics output glitching every few seconds).

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Fedora Networking :: Unable To Receive Multicast Data

Jun 13, 2010

I have just set up an FC 13 box for a small network application. At the core, the application is supposed to receive some data over a multicast on my local network. However, for some reason, I am not being able to receive any multicast data on this machine. Other machines, on the same network (connected on the same layer 2 switch) are receiving the multicast just fine. I have tried the following things:

1. ensure that I am joining the multicast on the correct interface: the machine has only one ethernet card. Also, after starting my application, I use netstat -g to check for group membership. The multicast subscription shows up fine.

2. ensure there is no error in the program: the program works fine on my person linux machine

3. ensure that the multicast is actually available: it is available on all other local machines. I also wrote my own small broadcaster. data from this broadcaster (running on the same box) is available to other machines but not to my own listener program.

4. no firewall/filtering settings on the layer2 switch

5. TTL setting on the broadcast: have tried changing it from 1 through 5 with no effect. Note that even if the broadcast is coming from the same machine, my machine does not pick it up while other machines on the network do so.

I suspect this has to do with some settings on the network card itself. Below is the output of /sbin/ifconfig on the card:

eth0 Link encap:Ethernet HWaddr 00:08:A1:67:BBA
inet addr:192.200.20.32 Bcast:192.200.20.255 Mask:255.255.255.0
inet6 addr: fe80::208:a1ff:fe67:bbca/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

[code]....

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Red Hat / Fedora :: Install Cluster On Servers - Validate A Multicast Address Before Using It?

May 19, 2011

I am trying to install a Red Hat cluster on my servers. In order to configure an heart bit between the servers I must give a valid multicast address. I wanted to know if there is a way to validate a multicast address before using it. For example if it is already in use i don't want to use it.

I read a little about it and there is a Perl module called IO::Socket::Multicast: [URL] There is a tool called mcasttrest.pl: [URL] Oracle use it to test multicast. But I am not sure what will do the trick in Red Hat cluster.

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Fedora :: Recompile Squid To Enable - Enable-storeio - Coss

Aug 11, 2010

How to recompile squid under fedora 13 to insert this arguments ---> --enable-storeio=diskd,coss

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Ubuntu :: Deluge WebUI Enable / Re-enable Subsequently Unable To Re-enable It (doesn't Appear In The Side Panel Again)?

Feb 10, 2010

I recently installed Deluge 1.2.0 from the following PPA:[URL]I using this on two different Linux computers. One is running Linux Mint 8 and the other is running Ubuntu Netbook Remix 9.10. The first time on either computer when I enable WebUI in the Deluge GUI it works fine. However if I ever disable it in plugins section I am subsequently unable to re-enable it (doesn't appear in the side panel again). Rebooting or reinstalling Deluge seems to have no effect.Is this a bug or am I doing something wrong?

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Fedora Networking :: Port Forwarding From Fedora To VirtualBox

Mar 8, 2011

I am using Fedora 14 x86_64 as the host and Windows XP under VirtualBox 4.0.4. I have added two ports (TCP and UDP) to the firewall settings in 'other ports' in the Fedora firewall setings. Do i need to do this?I noticed the port forwarding option in the Fedora's firewall settings which asks for either the ports to be forwarded to either local or an ip address. Do i need to do anything here?

In the settings under VirtualBox under Network adapter 1 (which is enabled) and attached to NAT, there is a port forwarding option in the advanced settings. Can the host and the guest port be the same number? If i use 'open port checker' to check if the tcp port is open in windows xp, will it work as it does in firefox under Fedora?

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Networking :: Shorewall: Port Forwarding Port Is Closed Even After Forwarding?

Dec 12, 2009

I have just set up shorewall on my router running Arch Linux. The external network is on eth0 and the internal network on eth1.I have set it up for masquerading and that works fine and I can open ports to the firewall. But I'm having trouble with port forwarding to my internal machines.The problem I have is that when port 22350 is forwarded to 192.168.1.3 on my local network, checking the port with nmap from a remote computer gives me:

Code:
PORT STATE SERVICE
22350/tcp closed unknown

[code]....

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Fedora :: Set The Display Size On X Forwarding?

Jul 22, 2010

How to set the display size avoiding taking up the whole screen.e.g.$ ssh -XC -c blowfish user@ip_address display:1 "gnome-panel"Does it take up the complete screen?

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Fedora Networking :: Port Forwarding Does Not Work

Mar 22, 2009

I have a question regarding port forwarding. I have a fedora server, with two eth cards: eth0 ---> external IP, eth1 ----> LAN IP I use SNAT for connection sharing. I also have an internet domain hosted on this server... let's call it [URL] Anyway, one of our computers in the LAN has some kind of web server on it, which must be accessed from the internet on the port 23700.

So, using iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport 23700 -j DNAT --to 192.168.1.25 (the IP of the network computer) Everything works perfectly fine from outside the lan. When I type [URL], I connect to that computer. My problem is that inside the lan, typing [URL] does not work! It only works if I enter it by IP 192.168.1.25:23700 Is there any way to make the server forward my request to that specific computer even if I'm inside the LAN?

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Fedora Networking :: Port Forwarding Not Working?

Apr 23, 2009

I am running Fedora Core 10 and KDE 4.2.1. My KTorrent is having trouble finding online peers lately. I suspect this is a port forwarding issue. I have set up my router to forward port 4444 (UDP) and port 56000 and more (TCP) to my machine's IP address. I have also set my local firewall (system-config-firewall) to allow these ports through.But when I try to test ports 4444 and 56000 via this Open Port Check Tool, it tells me they are closed

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Fedora :: X Forwarding Over SSH In A VNC Session - No Xauth Data?

Jun 16, 2010

Here is my setup:

Machine A (fedora, gateway on remote network)
Machine B (fedora on local network)
Machine C (Vista on local network).

I want to connect to machine A from C and run graphical apps on it. I figured that installing a vnc client will be easier then X server (last time I tried X server on windows it did not end well). To ensure security, I vnc into a local linux box (machine B) and then ssh over to the remote box. When I ssh (with the -X param) into A from B, everything works great including the graphical apps. However, when I vnc into B from C and then ssh into A, I get the following message:

Warning: No Xauth data; using fake authentication data for X11 fowrard If I then try to run a graphical app I get cannot open display:

localhost:11.0

why does X forwarding work directly and not through vnc?

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Fedora Networking :: Port Forwarding For Remote NFS?

Mar 31, 2011

I'm trying to implement remote NFS in our network

So I read a lot of posts on the Internet, but I don't understand which ports I have
to open/forward for this.

On some posts I see a lot of ports, I don't want to do this.

If this is the case, and I would set up NFS through an ssh tunnel, then do I only need the ssh port and does this mean it will always work if the server is reachable through ssh?

Or is this wishful thinking ?

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General :: Setup Self Port Forwarding On Fedora 13 X64?

Oct 2, 2010

How do I setup Self Port Forwarding on Fedora 13 x64 How Port Forwarding Works Port forwarding allows access to a local area network by a remote user through forwarding ports that provide ftp access and web server access. The operating systems use a kernel or ipfirewall to carry out the port forwarding process.

There are several different ways that port forwarding is accomplished. * Self Forwarding: Self forwarding is port forwarding that is accomplished on a local area network that has multiple computers connected to the network. Since all of the computers share the same IP address, the port forwarding must be conducted within each computer on its own system. If the local area network router has a network access translator then the computers that are connected to the router must also do port forwarding within their own system.Port forwarding can be accomplished with Unix systems however the port can only be accessed by the root administrator. This is a less common method of port forwarding due to the fact that using a root administrator poses risks to the system because the users will often take a detour to a higher port number to gain faster access to the server.Double port forwarding involves the use of multiple routers that join computers on a local area network. As a result, the ports on one router are forwarded to another router that acts as a gateway. The gateway router then forwards to a host on the local area network (LAN). This type of port forwarding involves the communication of several components which include the session server, session client, and session port. When the user establishes a connection the session server will connect to one of the session ports that are to be forwarded which will in turn, forward the port to the session client. Reverse port forwarding is used when access is required to a port that is protected behind a firewall.

While port forwarding is convenient, there are a few things to be aware of when using this type of technology. If you use port forwarding only one port can be used at a time and the machine that is receiving the port forwarding can only view the information as coming from the router instead of the original machine. Additionally, port forwarding can open up network access to other machines that may be able to find the port forwarding by gaining unauthorized access. I know how to setup port forwarding in my router along with Dyndns.org free ED, but my local area network has multiple computers connected to the network on my router. All of the computers share the same external (public) dynamic IP address; when I setup port forwarding only my Web Server can access the internet, so how do I setup Self Port Forwarding on Fedora 13 x64

[Code]...

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Fedora Networking :: OpenVPN And Remote Port Forwarding

Feb 10, 2009

I've recently installed OpenVPN on my dedicated server (Fedora) in order to have full internet access for all of my WinXP clients. In case somebody is interested in the details of the OpenVPN installation, I followed this documentation: Rootserver-as-OpenVPN-Gateway. The installation runs quire nicely, I'm able to surf the net and even file-sharing programs work on the XP clients - at least to some extent. There is a slight problem though: the file-sharing programs complain that they have a "NAT problem" or that they are "Firewalled".

Most likely, this problem can be addressed by configuring remote port forwarding (RPF) on the server. The only routing rules which I've added on the server during the OpenVPN installation are these:
Code:
# initialize natting for openvpn
iptables -t nat -F POSTROUTING
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o eth0 -s 10.66.66.0/24 -j MASQUERADE
Let's assume a certain application on a client is listening on e.g. port 1234. How do I configure RPF for this port on the server side.

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Fedora :: X Crashes - Ssh To A Remote Centos Server Using X11 Forwarding

Nov 24, 2009

My X crashes when I...

1) ssh to a remote centos server using X11 forwarding
2) open the virt-manager remote application (the virtualization management app)
3) Open the remote console

Just to be clear, my local X11 crashes. I get back to the log in screen.

I get in my Xorg log:

Backtrace:

Fatal server error:

-Is this enough for a bug report?
-How I can make X dump a core file for better debugging?
-Do -debug RPM packages still exist, and if so, should I install one for the X server and will this help with debugging, and if so, how do I install it.

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Fedora Networking :: Interface Refuses Port Forwarding Or NAT

Oct 29, 2010

I have a set up with a computer that has two network cards and is connected to two networks. Both networks connect to the internet via separate routers that have DHCP enabled. I can set one of the routers up to do port forwarding to the computer without any complications but if I want to do the same on the other router the port forwarding from it doesn't work and I can't reach the system.

I know for a fact that the services are accessible from both networks and both routers can forward ports to other computers in their network. The networks are 10.10.0.1/24 and 172.22.0.1/24. I've tried turning off iptables but that didn't change anything.

Is there any kind of setting that could prevent the interface on the computer to reject traffic using NAT or something?

If I disable the interface on the working network (ifdown eth1) then suddenly eth0 on the other networks starts accepting requests sent to it via the router that does the port forwarding. I do however want to emphasize that services work just fine as long as the requests originate from either of the networks they are on.

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Red Hat / Fedora :: Cannot See Graphical Output: WinXP, PuTTY, X11 Forwarding?

Jun 23, 2010

I am accessing a LINUX cluster machine via the internet from my PC. My PC is using Windows XP. To access the cluster I use VPN Client and PuTTY. I can access the cluster from my PC without any problems as long as only the command line and no graphical interface are involved. To allow for graphical interface I installed Xming and I enable X11 forwarding for PuTTY. However, the graphical interface/output of the program I am using (GrADS) does not appear. Instead I get the error message ?Segmentation fault?.Does anyone know what what I need to do in order to see graphical interface/output via PUTTY

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Ubuntu Networking :: Not Able To Get Multicast Working

Sep 1, 2010

I have several multicast data feeds that I'm trying to connect to using a minimal server install of Ubuntu as a VM on a VMWare ESXi server.I have another VM on the same server running Solaris that can connect with no issues to the incoming multicast stream.

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Networking :: Converting IP Multicast To MAC LLC Broadcast

Mar 5, 2010

This is not a linux specific question more of a general network issue with the hope that someone may have already done this under linux.My problem:I have a red hat linux machine transmitting IP multicast packets onto an ethernet gigabit network (cisco switch).Wireshark (running on a different red hat linux box confirms packets on network.

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Networking :: Multicast With More Than One Network Interface?

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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Software :: Joining Multicast IP Group?

Dec 14, 2009

How can i make my device join a multicast IP group.My target device is in linux

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