Managing and using network connectivity on a unix system

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3
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0answers
8 views

Radiusd(freeradius): User only for a special client

Is it possible to restrict a user from the "users" file to a special client? I try to use one radiusd server for two wifi access points but I will use one user credentials only for one access point ...
0
votes
0answers
4 views

Problematic RTL8188EE Wireless Network Adapter

Good Day All, There are numerous results when searching google on this issue, however, none seem to have a solution. I am hoping to resolve this issue -- or at least have a decent workaround. It is a ...
11
votes
4answers
47k views

Connecting to wifi network through command line

I am trying to connect to my WEP network just using the command-line (Linux). I run: sudo iwconfig wlan0 mode Managed essid 'my_network' key 'xx:xx:... hex key, 26 digits' Then I try to obtain an ...
3
votes
1answer
26 views

What exactly is an ifconfig dropped RX packet?

I'm seeing very high RX dropped packets in the output of ifconfig: Thousands of packets per second, an order of magnitude more than regular RX packets. wlan0 Link encap:Ethernet HWaddr ...
4
votes
4answers
5k views

Source code of netstat

Can I view the source code of netstat on my Linux machine?
0
votes
1answer
33 views

Manual network setting on Solaris 10

Am using Solaris 10 on Virtual Box. While installing I chose to assign IP manually. IP address: 192.168.1.46 Subnet: 255.255.255.0 Gateway: 192.168.1.1 Now when I ping my Solaris machine with other ...
2
votes
0answers
18 views

Make OpenVPN restart upon new network connection on systemd

How would you go about making OpenVPN automatically restart upon connecting to a network? The issue is that every time a network connection is lost, or if the computer is booted without a network ...
1
vote
0answers
11 views

docker container manual networking setup not working

I have an application environment where two containers need to talk to each other. container A gets a message from container B, and container A initiates a connection back to container B using the ...
8
votes
1answer
18k views

ifconfig command not found

I've just installed CentOS7 as a virtual machine on my mac (osx10.9.3 + virtualbox) .Running ifconfig returns command not found. Also running sudo /sbin/ifconfig returns commmand not found. I am root. ...
1
vote
1answer
26 views

Routing table and multiply hops

I have 6 networks, I need to connect network 1 and network 5 via five routers. What’s the command to set multiply hops? ip route add IP_address/mask via IP_adrress dev eth0, but how do I set next hop? ...
4
votes
1answer
33 views

Monitoring ARP Poisoning

How to monitor ARP poisoning? These few days my internal website that can be accessed locally has weird image replacing every images on the site for few seconds (it got back to normal after ...
3
votes
1answer
2k views

Accounting for /proc/net/dev reported traffic

I noticed that according to /proc/net/dev I am constantly receiving around 6Kb/s on my wireless usb interface. But I can't account for anything even close to that with the individual connections that ...
1
vote
1answer
29 views

systemd waiting too long for network at Debian 8.0 Jessie's boot

My system has booted up relatively fast while run Debian 7 Wheezy, but after upgrade to Debian 8 Jessie, and therefore SysVinit to systemd, it became a way, way slower. The thing, slowing down the ...
2
votes
1answer
678 views

redirect web server with no-ip and port forwarding in livebox

I want my Apache web server running on a Livebox (home router appliance running Linux) to be accessible from the Internet (WAN). I installed and configured the application noip2 on my Ubuntu PC. ...
2
votes
1answer
22 views

Office 365 online from Unix working only with MTU <= 1400

First of all --- I really didn't know where to post this question: askubuntu, unix, superuser... I am posting this one here because the only cases I have seen are on Ubuntu and I have a report for ...
1
vote
1answer
22 views

How to block the response of certain DHCP server

There are multiple DHCP servers that run on our LAN, and some of them are unwanted. Can I configure my OS to reject certain responses so that I can get the correct one?
1
vote
1answer
36 views

Change Network Bandwidth

I am using ethtool to change the bandwidth to 10MB/s. Since this is my first time using this program, I am struggling with the correct syntax to change it. I have tried something like: ethtool -s ...
1
vote
1answer
25 views

Is it possible to have 2 different passwords saved for the same network?

I'm not always at home and sometimes the router needs to be reset completely to receive a new wan ip address because my roommates are not very tech savvy at all. When this happens the password is ...
1
vote
1answer
41 views

Connectivity issues after updating to Debian Jessie

I have inadvertently upgraded to Debian Jessie from Debian Wheezy while I was trying to install VLC player :D. The upgrade did not go very well as my sources.list file was mix of wheezy and ...
3
votes
1answer
45 views

Prevent a lot of brute force attacks on Exim2

Some people or computers have been trying to log in a lot of times on my Linux DirectAdmin server over the last few days. I am receiving a lot of messages of brute force attacks for Exim2 in ...
1
vote
1answer
31 views

Where is routing table stored internally in the Linux kernel?

When I execute route -n, from where exactly (from which structs) is the information displayed retrieved? I tried executing strace route -n but I didn't help me finding the right place it's stored.
32
votes
7answers
45k views

What DNS servers am I using?

How can I check which DNS server am I using (in Linux)? I am using network manager and a wired connection to my university's LAN. (I am trying to find out why my domain doesn't get resolved)
0
votes
1answer
14 views

Cannot mount Samba share: Unable to find suitable address

I just moved house, and after putting up all my devices, on my RasPi, running Raspbian, I cannot mount my TimeCapsule's SMB file shares anymore. It used to simply work, but Now I get this: ...
0
votes
2answers
1k 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?
16
votes
5answers
21k views

CentOS no network interface after installation in VirtualBox

I have Ubuntu 12.10 on which i installed virtual box on which I setup centos 6.4 i386. On Ubuntu I have: 3.5.0-17-generic kernal running. On virtual box I install centos 6.4 and everything works ...
2
votes
1answer
53 views

LXC external IP configuration for containers

I rent a dedicated server and want to use LXC instead of KVM. I want to buy IPs for every single container. For now i have two external IPs: 193.X.X.30/32 213.X.X.31/32 I prefer a routing solution ...
1
vote
2answers
34 views

Looking for Vodafone's mobile broadband application for Debian 8 (Jessie); does it still exist?

I have a Vodafone K3760 3G dongle I've used on laptops since Squeeze & Wheezy generally using (in preference to Gnome Network Manager's own support for mobile broadband) an application Vodafone ...
0
votes
0answers
30 views

CentOS 6 Include Gateway for Static IP Address

I've just set up a static IP Address for my CentOS Machine using the following settings in /etc/sysconfig/network-scripts/ifcfg-eth0 #eth0 Config #IPv4 DEVICE="eth0" NM_CONTROLLED="yes" ...
1
vote
1answer
68 views

cannot ping my computer on local network

I am running on 64 bit OpenSuSe 13.2 with Gnome 3 desktop environment and unsuccessfully trying to set up Samba Server. I have another computer running windows 8.1 from which I am pinging the ip ...
2
votes
1answer
358 views

How to implement retry mechanism while executing the server url in the shell script?

I am working on a project in which I need to make a url call to one of my server from the bash shell script.. http://hostname.domain.com:8080/beat After hitting the above url, I will be getting the ...
1
vote
1answer
2k views

OpenSSH hangs after login without showing login prompt

I ran across an issue with ssh after fresh Ubuntu 13.10 installation on Lenovo T420. I tried git pull (which failed) and this led me to more general ssh failing. After spending some 2-3 hrs of ...
2
votes
3answers
1k views

How to automate connecting to multiple network devices, running a command and saving the output to a file?

I have to run a command on around 1000 network devices and save the output to a file. In a file I have a list of all the network device names that have to be connected to using SSH. I then have to run ...
1
vote
1answer
29 views

Connect to offline network on second interface

I would think there's likely a dupe of this around but I cannot find it. I have an offline router I'm using to connect a remote wireless device. The router cannot be configured as an access point, ...
-1
votes
0answers
42 views

Interfaces, IPTables, Connections, Local Connection - Confused :/

I configured my iptables today and ran into some questions i could not resolve yet. So it would be nice, if someone could verify or answer the following to clarify: Each interface can be configured ...
2
votes
1answer
49 views

How can I share my internet connection (wireless) with an ethernet only computer?

I have a raspberry pi B+ set up in a server configuration and it connects to internet succesfully over Wifi with a USB dongle. My other pi (an A+) has always been located downstairs in the garage, ...
4
votes
4answers
75 views

Linux as a network printer device (Raw, port 9100)

Is possible to configure a Linux computer to work as a "network printer device" ? I have an USB printer that I intend to share in the network like a native network printer device. Is that possible? ...
10
votes
3answers
7k views

Openswan connecting to multiple right subnets not working

I'm trying to use Openswan (version 2.6.37) to connect an IPsec VPN from my local network to a remote site. Everything works fine when I just want to connect to a single subnet on the remote site. ...
15
votes
11answers
61k views

Cannot enable network after CentOS 6.3 fresh install

I am trying to perform a fresh CentOS 6.3 installation then run various yum commands such as yum install httpd. The installation runs fine, however I cannot run any network based commands like yum I ...
0
votes
0answers
17 views

dhclient allows for address conflicts

I invoke from my application dhclient but there is a problem with IP addresses conflicts. If I have other interface with statically set IP address, dhclient does not send DHCPDECLINE when DHCP Server ...
2
votes
1answer
42 views

Where does network waiting go in 'top'?

If top is showing high loads, and you don't know if the process causing it is doing processor time or is doing network i/o (not local i/o) how can you find that out? On our server I see high values ...
1
vote
1answer
34 views

How to send AT commands to modem once the connection is established?

I have a zte 3g modem. I use carrier provided dialer for connection establishment. Once the ppp connection is active, i would like to send some AT commands(for ex. Query signal strength, AT+CSQ). But ...
2
votes
3answers
102 views

Understanding WiFi routing and gateway

I'm completely lost. I'm a real beginnqer about Linux networking. What I’m trying to accomplish : As bobstro said, I want to allow a wifi-connected UPnP camera to be moved around between wifi ...
0
votes
0answers
31 views

What are possible reasons why iwconfig is not updating connection stats?

I use iwconfig to show me some information about my current internet connection like this $ iwconfig wlp2s0 IEEE 802.11abg ESSID:"eduroam" Mode:Managed Frequency:2.462 GHz Access ...
0
votes
1answer
19 views

Route a port through a network interface

I'm using OpenVPN on Ubuntu Server to connect to my VPN. That network interface is tun0. All traffic currently goes through the VPN. I'd like to exclude traffic that goes over a specific port, and ...
1
vote
1answer
514 views

MacOS X Mavericks running VirtualBox cannot communicate with Linux VM

I have a MacOS X Mavericks host running Vagrant using VirtualBox as a provider. I have experienced several times that with different VMs (particularly Ubuntu Linux VMs) after the first time the VM is ...
0
votes
0answers
25 views

IPvsadm, cannot get it to work at all

From my production server, I should make several connections (>50) to two different IP addresses. I am trying to load balance among these two IP addresses when making outbound connections so that the ...
7
votes
3answers
302 views

How many bytes occupy a simple nmap to a host?

Today the IT manager got angry because I used nmap on the 3 servers I manage to see what ports they had open. I know I could have used netstat inside the host' shell. He told me that "If the network ...
6
votes
1answer
584 views

Unable to configure eth1 and eth2 properly on Ubuntu

I am completely new to network administration, and so am finding things a bit tough. I have a machine, whose 1 interface I have to set to the subnet 10.0.20.0/24, another to 10.1.0.0/24 and a third to ...
14
votes
2answers
51k views

Orphaned connections in CLOSE_WAIT state

I've got a SLES machine that accumulates TCP connections in a CLOSE_WAIT state for what appears to be forever. These descriptors eventually suck up all available memory. At the moment, I've got 3037 ...
1
vote
1answer
541 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 ...