Managing and using network connectivity on a unix system

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Debian: Network connection dropping randomly

I am having an issue with my network connection dropping after a while, sometimes an hour if I'm lucky two. I can regain the connection by running: sudo ifdown wlan0 sudo ifup --force wlan0 when I ...
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70 views

Network connecting trouble shooting

I am trying to connect to the network of my school. With Windows 7 + IE it is not problem at all. I connect to it, no matter what web-page I try to reach, I get forwarded to ...
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1k views

Mint 15 on Lenovo G700: wired internet not working (Atheros QCA8172)

Mint 15 doesn't see internet after installing it in dualboot with windows 8 (in Windows internet works well). My network card is Qualcomm Atheros QCA8172 Fast Ethernet (rev 10). What I did: Install ...
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192 views

What is causing my UMTS modem to hang up?

I am trying to established PPP communication to my mobile ISP with wvdial, but I always get modem hang up message. In my syslog I can see some activity: Oct 29 07:48:47 linuxbox kernel: ...
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2answers
517 views

Realtek drivers prevent detection of eth1 interface?

Here's the situation: I had a working network setup on my Debian box, with two Ethernet interfaces being reported by ifconfig - eth0, and eth1. eth0 is an onboard Realtek NIC, and eth1 is a D-Link ...
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32 views

Wireless problems

installed linux mint on a netbook and was working fine until yesterday. When I go to netwrk icon at the bottom, all my ssid are missing and I now "Wireless Network device not ready" in grey.It looks ...
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1answer
247 views

wireless enabled but can't browse internet

My laptop sees wireless ssid and connects but I get unknown host when trying to ping www.google.co.za, but I get replies when I ping 8.8.8.8, my other machine connected to the same router can surf the ...
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2answers
662 views

Need to add virtual interface in Suse Enterprise Server edition permanently

How can I add virtual interface in SUSE Linux Enterprise Server 11 permanently?
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59 views

Ping wireless interface from wired interface

I'm performing some wireless measurements. The setup I'm now using is composed of a WiFi AP and two laptops. One laptop (A) and the AP are connected to a common switch, while the second laptop (B) ...
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177 views

NIC missing in 70-persistent-net.rules

I am using Ubuntu and typing ifconfig -a shows all interfaces but one(eth4), while the file 70-persistent-net.rules contains all(including eth4) but one (eth8). Any idea why is that and what are ...
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44 views

my IP is deallocated by itself after a time later

I use ssh to connect a remote Linux device and assign IP address manually by ifconfig eth0 192.168.0.2 (I know ifconfig is depreciated and I should use ip instead). More or less each half an hour or ...
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2answers
100 views

Sharing a 1 GB HD file that can be stream more then 10 computer simultinuasly

I want to share a file that is sized at 1 GB and my OS is Linux Ubuntu 12.10 via a wireless router by the name of TP-link with a speed of around 400MBps. I want to share this file to at least 10 ...
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319 views

Frequent disconnections in OpenVPN

I'm suffering random disconnections with OpenVPN. I don't know much about the subject, maybe you can point me in the right direction? Here is the tail for /var/log/messages, it contains a <warn> ...
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263 views

unable to ping gateway and CLAN in Linux but pingable in Windows PC

We're installing RHEL 5.5 for our Voice Portal (Avaya). After configuring the IP address, gateway IP, and netmask we tried to ping it so we could see if it was pingable/active or not. Sadly its ...
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205 views

Network goes down when LAN cable plugged in

As per subject, I have a Zimbra mail server on Centos 5.5. and the problem is there that when I plug the LAN cable in to the server port all Internet and network services go down. This means the ...
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395 views

how to configure USB networking on fedora

I have a Samsung smartphone, which can be connected to a free WIFI network, but my laptop can't connect to that WIFI network. So I want to use my smartphone as a router/forwarder. I want to connect ...
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60 views

How can I solve segmetation fault on ns2.35

I am trying to compile make on ns2.35 after I add patch of codel algorithm and it gives me this error make[1]: Leaving directory ...
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1answer
1k views

Can't access XAMPP on Centos from other Windows PCs

I have a server with Centos 6 on it and I have installed XAMPP on it. I have this server on static IP address. But I can't access this server's IP address from other PCs. I tried to access XAMPP on ...
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78 views

PBX randomly loses network connectivity and restores itself

I'm using a QBX appliance, which is just a microATX desktop system with FreePBX connecting to asterisk and some other slapped together stuff running on CentOS 5.4. It's horribly out of date (which I ...
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3answers
526 views

Fedora 18 host cannot ping Windows XP guest

I have my laptop running Fedora 18. I want to run a Windows XP guest using VirtualBox 4.2.6. My configuration seems correct, here is my networking report. Fedora 18 host lo: ...
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1answer
47 views

No internet access for system services; however, browser access works

Unable to reload repos via apt-get, aptitude, or synaptic. Dropbox does not connect or sync. Pithos does not connect to pandora.com. Chrome and Firefox browsers do work fine. I have been unable to ...
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1answer
99 views

What are the other congestion control algorithms specially designed for lossy Wireless Networks like LTE and WiMax?

I am trying different congestion control algorithms for getting maximum throughput and minimum delay across my setup for TCP flow.Please suggest other available algorithms apart from Veno, ...
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1answer
133 views

Local host always being added to /etc/hosts.deny when trying to SSH

I have a rather odd problem with my server. For some reason the local hostname for my workstation keeps getting added to the /etc/hosts.deny and when I try to SSH I get: ssh_exchange_identification: ...
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442 views

Tools to find OpenVPN UDP packet corruption

Are there Unix tools to troubleshoot UDP packet corruption? I'd like to avoid writing my own... I think ping might report when a packet is corrupted, but it doesn't really seem to have options ...
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1answer
303 views

Unable to get embedded device to ping anything on the network

I have an embedded device, built using buildroot, kernel version 3.6.11 running busybox. The kernel is built with completely default options. I have configured the device according to what the network ...
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82 views

Wired connection going through wrong router

My son has a problem not getting a cosistant wifi signal in his bedroom so he uses another router wired to the gateway. The problem I have is that when I connect to the gateway his router issues me my ...
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1answer
554 views

Allowing access to NetBIOS port in Fedora 18?

I've recently installed Fedora 18 on one of the machines in my office, and I've installed Samba so I can browse the file system on my Windows machine. However, I'm having some trouble opening port ...
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239 views

PC BSD Warden network interface

The documentation for PC BSD's Warden mentions that the configuration of the right network interface is crucial. However, it doesn't say what the "right" interface is. This may sound like a stupid ...
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249 views

Parameters of optimization TCP / IP in Linux Mandriva

In the registry of Windows XP can find the following options to enable optimizations for TCP/ IP: - MSS; - TCP Rx Window Size; - SACK (Selective Acknowledgment); - ECN (Explicit Congestion ...
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1answer
98 views

Remote linux using vnc and gdm without login

I remote linux server by using vnc and gdm. This link is very good but I would like to remote linux server using vnc viewer without login. May I know your suggestion?
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1answer
1k views

Networking with Linux and Windows 7 using Samba

I've installed Samba on my Arch Linux, and I wanted to share files with Windows 7 on other PC via local network. I want it to work both ways, i.e. Windows can read and write freely without any ...
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292 views

Host reachable via SSH from my desktop but not my laptop

I try to use ssh to log in to a remote host. This works for my Ubuntu desktop, however, it fails from my Fedora 14 laptop. The failure means after I type ssh username@host and pressed Enter, ...
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487 views

eth0 not getting disabled after setting up br0 interface

On debian squeeze, I setup a bridge based on eth0. My /etc/network/interfaces is # The loopback network interface auto lo iface lo inet loopback # The primary network interface #allow-hotplug eth1 ...
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211 views

No ports can be found using port scan

Problem: I have a laptop and a server (Home-Server) with fc17. They are both using the desktop environment. I am trying to set up a VNC server on Home-Server so that I can set everything up without ...
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2answers
3k views

How can I reinstall Network Manager after uninstalling it?

I am running a version of RHCE6 on my laptop, and lately I've been trying various stuff about network configuration through command line. Last night, I tried removing the NetworkManager using yum ...
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550 views

Changes made to ifcfg-wlan0 doesn't seem to make a difference

I am running RHEL6 on my laptop. The wireless adapter configuration file ifcfg-wlan0 didn't come by default under /etc/sysconfig/network-scripts. So I created it myself. The problem is, whatever ...
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2answers
109 views

How do I set up a small personal network with Linux? [closed]

I want to take the time to get into building a useful network for use between my personal machines using Linux. I have spent a lot of time scouring the web for resources on how to do this but I am ...
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1answer
331 views

Network Disabled

I have just installed ubuntu server edition in order to create a home network. But I am not able to find IP of the machine through ifconfig (showing only localhost). Then I tried lspci | grep -i ...
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952 views

Multiple subnets on multiple virtual interfaces with one physical interface

I have a Ubuntu pc with one interface -- eth0 -- which is connected to an unmanaged switch which is linked to two subnets: 192.168.0.0/24 and 192.168.1.0/24. I want to have two virtual interfaces with ...
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1k views

Multiple network adapters with Virtualbox guests?

I'm running VBox under Mac OS with multiple Linux guests (Redhat). Everything works fine except I want to test dual NICs in one of my guests. I'm using host-only adapters and would like to simulate ...
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134 views

Comparing the efficiency of Network Stack of two different Operating Systems

I want to compare the efficiency of Network Stacks of two different operating systems(Linux and Solaris) by measuring the amount of resources(context switches, systemcalls etc) that are consumed in ...
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146 views

Network Interfaces Don't Exist After Loading Modules

I installed SourceMage Linux on my laptop and the ethernet and wireless interfaces don't exist after loading the required modules (tg3 and ath9k). On other distros (Xubuntu, aptosid) the networking ...
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1answer
414 views

Netdiscover packages for Fedora?

Ubuntu has a program called netdiscover. Netdiscover is an active/passive address reconnaissance tool, mainly developed for those wireless networks without dhcp server, when you are wardriving. It ...
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1answer
106 views

How to forward IP traffic between wlan0 and eth0 without killing network performance on the forwarding machine

I have a laptop running Debian 7 that connects to my building's Wifi. I want so share this network connection via the laptop's Ethernet port. I have setup a script below to do this based on some ...
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1answer
225 views

Postfix header_checks

I want to forward a copy of the users email which has the specific subject. I have tried the below settings, able to Redirect that particular subject mail. But I want to forward a copy of that mail to ...
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2answers
73 views

Check that fail2ban is running?

I just installed and configured fail2ban. I want to make sure it is working. I don't want to block myself from the server so I can't just login (poorly) a bunch of times. How do I see that fail2ban is ...
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4answers
738 views

How can I configure IP address from class E on Linux?

I would like to configure an IP address from class E, for example 241.0.0.2. Currently Linux (Linux-2.6.21.7-hrt1) returns the following answer: ifconfig: SIOCSIFADDR: Invalid argument Is there a ...
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2answers
1k views

How to know ip camera address

I have ip camera with static ip address preset. How can I know it ip using linux? I connect camera direct to my notebook. My system is Linux machine 3.5.7-gentoo #2 SMP ifconfig eth0 eth0: ...
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928 views

How to transfer files over bluetooth?

How can I connect my mobile phone and Lubuntu 11.10 laptop over bluetooth so that I can transfer files between them?
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1answer
108 views

How to control network bandwidth using Linux [closed]

Currently my Internet is really slow. But I want to allocate all resources to a browser that is loading a movie. How do I do that?