Managing and using network connectivity on a unix system

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My kdeinit4 process hogs all wifi traffic

It seems my kdeinit4 process eats up a good part of my wifi bandwidth by sending a lot of stuff. #netstat -tap Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address ...
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13 views

VMs fail to start after reboot - Error starting domain

I set several VMs up in Virtual Machine Manager in RHEL 6.5 that have been working fine until now. While working on a VM, I had a problem with the server freezing, not just the VM, but the entire ...
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1answer
12 views

Gateway with colliding networks

I have an Ubuntu-box as a gateway with two interfaces. The first one (eth0) is the internal network and has the following address: eth0: 192.168.1.1/24 The second one is connected to a router from ...
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18 views

Configure a usb wireless adapter when hotplugged

I have a pc connected to the internet on eth0 and I have a usb wifi dongle: I succeeded to configure it as a hotspot to which I can connect from my mobile devices so that I can share the pc internet ...
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1answer
43 views

Why can I ping google.com but not www.google.com [on hold]

I can $ping google.com and get data back PING google.com (74.125.227.96): 56 data bytes 64 bytes from 74.125.227.96: icmp_seq=0 ttl=56 time=26.939 ms 64 bytes from 74.125.227.96: icmp_seq=1 ttl=56 ...
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20 views

Ec2 network bandwidth consumed by internal ip? [on hold]

On iftop I can see ip-172---2.ec2.internal connected to my Ubuntu ec2 server for a long long time? This address doesn't even resolves as its a ec2 internal IP address. How can I block it?
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10 views

Plain Bridge vs. Open vSwitch

Is there any performance benefit in using Open vSwitch over a plain bridge?
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3answers
34 views

Server running on guest Linux VM will not accept connections from Windows host

I have a simple echo server program running on CentOS 7. If I run both the client and the server in the VM, I can connect to the server. I'm using VirtualBox with the "bridged" network configuration. ...
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2answers
41 views

tcpdump doesn't appear to be capturing any data, why?

I'm trying to capture data with tcpdump like so: $ sudo tcpdump -Xi eth0 I have the device and the PC connected to each other. On both sides I launch a simple test application that sends a message ...
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1answer
15 views

NAS set-up issue with NFS protocol in linux Mint

I have a Synology NAS that I'm trying to map in my Linux machine as if its like a regular HDD drive. I have looked all over the internet without being able to figure out how this thing works. I have ...
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14 views

Debian WLAN to LAN bridge, double IP address

Target device is Raspberry Pi, with Debian running kernel 3.12.9-1+rpi1. I want to bridge USB WLAN card with local Ethernet NIC, but I want to have 2 IP addresses on that bridge interface, one from ...
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2answers
45 views

Can neither PING LAN nor when it is connected to OpenVPN

I try to configure OpenVPN on my raspberry-pi (minimal raspbian-wheezy distro). I run OpenVPN behind a Router and want to connect from a Windows client. I can connect to the server but I want to ...
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1answer
49 views

Default contents of /etc/network/interfaces on Crunchbang/Debian?

I've broken localhost on my computer. For example python -m SimpleHTTPServer and curl http://localhost:8000 don't work. The contents of my /etc/network/interfaces is empty. Does anyone know what the ...
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9 views

Intel Centrino Wirelsess-N 1030 not getting connected on generic mode in ubuntu 14.04

I upgraded Ubuntu from 12.04 to 14.04. After upgrading neither WLAN and ethernet work and also does not work in recovery mode (enable networking) or root shell. When booting the previous version ...
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16 views

Are layer 2 protocols part of NIC or NIC's device driver at kernel?

Are layer 2 protocols like IEEE 802.2 (LLC), PPP, HDLC, frame relay, etc part of NIC or NIC's device driver at kernel? When we configure layer 2 protocol to be used like PPP, where is the ...
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2answers
56 views

How can I deny internet access to all processes except the chosen ones?

Sometimes I am forced to use really narrow Internet bandwidth of 56kbps. On my Ubuntu desktop I have too many programs, that frequently check something on the net - and hunting and disabling them ...
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28 views

Trying to connect to an open network with Ubuntu 14.04, no problem in Windows

The Ubuntu network connection seems to fail at every open network. I have no problem connecting at home to a WPA network. Using WICD. It seems it fail to get an IP. Here are the results of sudo lshw ...
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1answer
32 views

Find service by network activity

I see a strange DNS request at tcpdump and I want to find service which is originated from. I've already tried to find it with different monitoring tools but still no luck. Is there any proven ...
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1answer
26 views

Difference between route cache and neighbor table

Our Ubuntu server runs as a router for thousands of devices. With the growing number of connecting clients we have noticed 3 overflow problems in the kernel log: 1. Route cache chain too long 2. ...
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2answers
51 views

Can two hosts have the same IP address in /etc/hosts?

can two hosts share the same IP Address without a conflict. This is how my /etc/hosts looks like :- $ cat /etc/hosts 127.0.0.1 localhost 127.0.1.1 debian 127.0.1.1 mini Now as can be seen ...
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34 views

CentOS 7 gnome Version Network issue

I just installed Cent-OS 7 with GUI Interface, but now I am logging in but I can not connect to network, in virtual machine I see it's connect with bridge (VMware) but I cannot connect to network, I ...
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42 views

eth0 and wlan0 set-up problem in Linux Mint

I had a perfectly working wi-fi connection on my Mint-KDE PC. Recently, I brought a Synology NAS and after some research figured that I need to set my eth0 to static IP for it to connect to NAS via ...
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1answer
10 views

Can I assert that a Wi-Fi AP with a higher “quality” will be better in most cases?

I have an application on Raspberry Pi that needs to determine which available Wi-Fi access point to use, with their statistics collected by iwlib beforehand. iwlib or iwlist has three indicies for ...
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1answer
36 views

How can I use a Raspberry Pi as a router between two WiFi networks?

I want to RDP from PC1 (Running Windows 7), to PC2 (Running Windows 7) using Pi (Raspberry Pi running Debian). This the network situation: Network1 Network2 ...
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45 views

Tried changing to static ip in RedHat 6.5 using VMWare. Unable to access the internet now

I followed resources on the internet to assign static ip address for RedHat 6.5 installation in VMWare. I am unable to access the internet after that. My terminal output of the files I changed are as ...
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1answer
108 views

Can't get tc to limit network traffic

Based on this section of the Linux Advanced Routing & Traffic Control HOWTO, I can't get tc to limit the network speed in my computer. Basically, I have 13 machines in the network, and this ...
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0answers
47 views

Cannot SSH after switching to Netgear router

I have Comcast Xfinity internet. When I was sent their Wifi router/Cable modem combo box, I was able to use SSH perfectly. However, since the Wifi from the box was weak, I decided to buy my own ...
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65 views

Ubuntu server boot assigns names to NICs erratically but all traffic is handled on only one NIC

I have two NICs, em1 and p3p1 on my Ubuntu 14.04 Server. During boot, network interface eth0 is renamed to both em1 and p3p1 but the order is not consistent from one boot to another. In use ALL ...
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2answers
53 views

Drop TCP packets and prevent TCP retransmission

I have an application that sends TCP data to a server. My server is made to intentionally drop the packets sent by the application, and as a result the client retransmits the packets. I need to ...
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0answers
15 views

Assign Special Records for specific remote clients DNSmasq

I'd like to make DNSmasq serve special records for specific remote clients (Clients from the public internet) So for example if remote host 111.111.111.111 requests www.example.com it returns 3.3.3.3 ...
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121 views

Linux Mint 17, Wifi Slow and Drops Connection, No Ethernet Connection

On a fresh install and updated Linux Mint 17 XFCE, the system cannot maintain an internet connection through wifi, and is unable to connect at all through ethernet. Wifi will work somewhat slowly for ...
2
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1answer
50 views

How is the content of configuration files parsed on different Linux distributions?

Different Linux distributions store the same configuration parameters in different files. For example IPv4 address in Debian Wheezy is stored in /etc/network/interfaces file while in Fedora 20 it is ...
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2answers
30 views

How to know URL being observed directly in a server

I host many websites using cpanel. I want to know URL being accessed at real time. It seems that many old domains still point to my host and they seem to take a chunk of CPU
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0answers
20 views

Want to assign dedicated default gateway on Two NIC card on linux server

We have one server having two nic cards. Here we configured two separate networks on both nics and having different gateway. However our one sub-net is able to communicate to outside network second ...
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0answers
18 views

Server load is very high with unusual iftop result

Sometimes my server load is insanely high. Things like 120 or something. I checked what's wrong. What I see can be seen in this question: How do I interpret this IFTOP result Basically when I run ...
4
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1answer
20 views

What does this netcat output mean?

I want to telnet into my locally running VM which has a dictd service running on port 2628, when I issue my nc -v command though I get the following: $ nc -v localhost 2628 nc: connectx to localhost ...
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25 views

How can I embed a console app's output into my X11 desktop?

I'd like to view NetHogs output on my desktop. For example, do any Conky or applets on Cinnamon exist, so I don't need to have a terminal open all the time?
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1answer
96 views

Fake linux as android device

How can I let my GNU/linux completely mimic an android device when connecting to a wireless Access Point? I explain: I moved to another location and it seems that my android phone and tablet have a ...
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0answers
13 views

After adding FORWARD NAT rules, cannot connect system eth0

I was trying to make bridge connection between wlan and eth on Centos.. I made Forward and NAT rules and then something wrong with System eth0 connection. It does not connect anymore.. Could you ...
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1answer
44 views

Why IP address for Linux Bridge which is layer 2 virtual device?

Shouldn't bridge (or a switch) be working without having an IP address? I believe I can have a bridge br0 setup with eth0 and eth1 as members both having no IP addresses. I can't understand why an ...
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0answers
24 views

How do I interpret this IFTOP result

I used iftop and got strange result It looks like I am heavily visited by ztomy and zerolimites.com. What the hell is that? Also I saw msnbot-157-55-39-140.search.msn.com . Is that a host or user ...
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75 views

Why I can't ping anymore?

In my Ubuntu 14.04 I have two ethernet interface. Eth0 is connected to main internet using DHCP auto and eth1 is to share with other PC's. $ cat /etc/network/interfaces auto lo iface lo inet loopback ...
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34 views

Kali Linux airodump Not Finding Networks

When I use the airodump it is not coming up with networks available around me. The chart comes up but nothing inside it, even though there should be about 10 networks around me coming up there is just ...
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0answers
54 views

Why iperf still reports 1Gbps performance when using bonding over two 1Gbps adapters? [migrated]

As I understand it, bonding brings among other benefits the ability to increase the network speed between two machines in a LAN. Bonding [...] means combining several network interfaces (NICs) to ...
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0answers
42 views

Opensuse 13.1 wifi doesn't work (intel k53E laptop)

I downloaded opensuse to dual boot from a CD and got everything installed. At first, my wifi was working. Then I went to school and it stopped working and wouldn't connect to anything even when I ...
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3answers
82 views

Are there network connections that don't use the WiFii card or the Ethernet port?

I see many connections like when I use netstat, are they all to the internet? Are there any connections to the internet or other things that aren't forthcoming? I guess what I'm asking is what does ...
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56 views

Is it possible to prevent eth0 network traffic from accessing eth1 network?

I am not really sure how this is possible but I have a linux(ubuntu 14.04) box with 2 interfaces. eth0 is connected to our lan 192.168.0.* and eth1 is connected to a dlink wifi router on network ...
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2answers
67 views

How to troubleshooting failing ping to router on a linux box?

I have a home network 192.168.0.x from which I am posting this message, on this network I have a CentOS7 host 192.168.0.3 which is running a DNS server for the network. I can ssh into 192.168.0.3 I ...
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2answers
222 views

How to use a defined local IP instead of external one

I have a Gentoo Linux server. Server is connected to two networks: internal and external. Internal network ip: 192.168.1.200 External network ip: 192.168.0.2 If I'm trying to make request from ...
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7 views

location of struct ifnet on AIX [migrated]

In which header file on AIX struct ifnet is defined? I want to use this structure to get network interface information on AIX.