Managing and using network connectivity on a unix system

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1answer
162 views

Linux tools to choose suitable Cisco ASA 5500

I have a linux webhosting server which attracts DDOS attacks. I want to use Cisco ASA 5500 Series Adaptive Security Appliances to protect the linux server from them. I know there are many factors ...
2
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0answers
240 views

Setup DSL Network Connection in KDE

I have recently migrated to KDE from unity (ubuntu 12.04). I have a PPPoE network where I live. Under unity, gnome, xfce I am able to set up a DSL connection and everything works fine. I tested a live ...
2
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1answer
10k views

Error, some other host already uses address IPADDRESS

I have the following scenario on my Centos 6.2 server: eth0 : has IP 192.168.50.10 eth0:5 : has IP 10.0.0.1 When I boot the system, everything is up and working. When I run: ifdown eth0:5 and after ...
2
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1answer
599 views

Determine whether XBOX 360 is on

I want to determine in close to real-time (up to 5s lag would be OK) when my XBOX 360 is switched on or off over the network. The XBOX gets a static IP address which I know. However the XBOX seems to ...
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2answers
327 views

Interface and alias up at the same time

I have on my eth0 NIC card the following IP alias (I'm running CentOS 6.2): eth0 - IP: 192.168.50.1 eth0:5 - IP: 10.0.0.1 Now, when I boot the server, both interfaces come up and respond, but if I ...
2
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1answer
735 views

Enabling bwn in FreeBSD

I am trying to load the bwn driver as a module as mentioned in the man page. However, when I attempted to edit /boot/defaults/loader.conf I could not write the changes to the file, this was attempted ...
3
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1answer
412 views

How do I transfer files to a SunOS server via sftp with FileZilla?

According to the admin of the webserver, I should be able to use Filezilla to transfer files to the server but I am getting an error. I set up Filezilla for transferring files sftp - using these ...
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1answer
827 views

AP randomly gets unreachable for the clients while hostapd is running

I got an old PC running as router which has 3 NIC and 1 wifi PCI card TP-Link L-WN751ND. This box runs Debian Wheezy, hostapd, dhcpd etc. The problem is that AP randomly gets unreachable for the ...
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1answer
679 views

Changing hostname without errors

I tried to change my hostname according to this guide for Debian based system: I edited /etc/hostname I ran /etc/init.d/hostname start Though there are errors. Always when I write a sudo command ...
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3answers
717 views

Limiting a specific shell's internet bandwidth usage

I want update my linux in one shell but by default wget or axel in updater use all the bandwidth. How can I limit the speed in this shell? I want other shells to have a fair share, and to limit ...
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4answers
12k views

Throttle the download speed of wget or curl while downloading

Is it possible to throttle (limit) the download speed of wget or curl ? Is it possible to change the throttle value while it is downloading ?
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1answer
3k views

Cannot connect to fedora on port 80

I can't access to my local sites on a fedora machine from ubuntu. In firefox I get this error: The connection has timed out In fedora iptables I added this line: -A INPUT -m state --state NEW -m tcp ...
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1answer
102 views

Is there a way to redirect requests from foo.com to a VM on that server?

I saw a tutorial about redirecting client requests to a specific port to a VM inside the server using IPTables. Is there a way to redirect client requests for foo.com to a VM using only IPTables? or ...
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1answer
3k views

VMware Player on Linux, bridge networking

I am having trouble with VMware Player 4.0.3 for Linux. I am trying to run a Linux virtual machine guest (from the Linux host), but am unable to successfully get an IP address on the guest with bridge ...
4
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1answer
4k views

dhcp: Host name lookup failure

I changed configuration of /etc/sysconfig/network-scripts/ifcfg-eth1 and used ifdown and ifup to reset it. Then used ifconfig eth1 dhcp start it does not work and say:dhcp: Host name lookup failure. ...
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1answer
661 views

CentOS network connection breaks every 5 min

I installed CentOS 6.2 about a month ago and it worked fine. Two days ago I saw that the internet connection is broken, so I reconfigured it. I was able to use it but after a few minutes it broke ...
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1answer
3k views

NAT (Internet connection sharing) switching between multiple public interfaces

My Ubuntu 12.04 (precise) laptop has three network interfaces: eth0: wired interface sometimes connected to the Internet wlan0: wireless interface sometimes connected to the Internet vboxnet0: wired ...
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1answer
526 views

How can I setup a wifi access point to only allow users if they accept an EULA?

I need to setup an access point to only allow users through if they first accept an EULA. To make things slightly simpler, I'm looking into doing this with a unix machine that shares the connection ...
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1answer
912 views

How to share a tethered iPhone internet connection with VirtualBox guest?

I mostly connect to my Linux distros to the internet via a USB iPhone tethered connection (MyWi app). I have just installed an Windows XP guest OS via Virtualbox on Ubuntu 12.04. How do I connect ...
3
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1answer
570 views

Verbose DNS query to see DNS query order?

I typically determine the IP of a host by doing: $ host -t A example.com. Is there a more verbose version of this that tells me whats happening in the background, specifically the order of what is ...
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1answer
517 views

Using google DNS in netcfg

how can I set up my netcfg profiles to use the google DNS servers? I've tried IP = 'dhcp' DNS = '8.8.8.8' but that didn't cut it.
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2answers
2k views

TOR Transparent Proxy - How does to the TCP redirecting work

I used an iptables ruleset based on the sample ruleset from https://trac.torproject.org/projects/tor/wiki/doc/TransparentProxy, Section Linux, Local Redirection Through Tor, to set up Tor as a ...
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2answers
2k views

Configuring a VPN in my CentOS server

My server runs CentOS 6.2. It has two network cards (eth0 and eth1). In my server I have installed CoovaChilli access controller software, that manages the LAN under it. This management is done ...
2
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1answer
343 views

Constantly pinging a server

I am not sure if this is exactly the right place for this question, but there is no networking stack exchange. I want to ping a server a bunch of times (eg.10,000+) to gather information on the ...
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1answer
4k views

DNS Issues on RHEL 6

I'm experiencing some DNS issues on a new RHEL 6 virtual machine. Ping is working fine to an IP, but the machine is unable to resolve any names. I've tried adding Google's DNS servers (8.8.8.8 and ...
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1answer
5k views

“Destination Host Unreachable” when pinging wireless router

I'm a little new to all the intricacies of Linux workings, so please bear with me if this is a dumb question. I'm using Linux Mint 12 and I have an Asus PCE-N15 wireless card, which is running the ...
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2answers
4k views

Where does Debian store network connectivity history?

I would like to know if Debian has anywhere where it stores a history of network connectivity- IP addresses/server, DNS etc?
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1answer
297 views

Auto-switch to wifi

Need to connect to specific wifi point as soon as it is in range. If it is out of range, then system must stay connected LAN. In case, any wifi-point is in range, there must be auto-switch.
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1answer
2k views

Interpreting output from iostat

I'm facing really slow speed serving just static files from 300 to 900 MB on a 1 GBps dedicated line. This is the output from iostat but I don't know if this is ok or not. Linux ...
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1answer
57 views

Do IPTABLE rules apply to other devices on a network?

I have an embedded device that listens to a specific port to be programmed by vendor specific software. If I have a network that consists of a small linux computer and this industrial device would ...
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2answers
958 views

SSH into Ubuntu VM remotely

I don't have much Linux or networking experience, but I'm trying to SSH into an Ubuntu virtual machine from outside of my home network. The Ubuntu virtual machine (running inside VirtualBox) is ...
2
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3answers
656 views

VirtualBox networking host-only: Linux host XP Guest

I'm having trouble connecting XP ( Guest system on VBOX ) to Debian Testing (host). The version VirtualBox 4.1.12 Relevant parts of the output of commands. ifconfig on debian: eth0 inet ...
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0answers
438 views

Add blinking network-monitor icon to GNOME / XFCE

I'd like to see if I have incoming or outgoing network traffic via a little blinking network-monitor icon in my system tray, similar to the network system tray icon in Windows XP and Android. I would ...
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1answer
4k views

DHCP server: offer different subnet addresses for different interfaces

I'm running Ubuntu 10.04 on my home router which has multiple network interfaces. I have dhcpd configured to provide addresses from 192.168.1.0/24 subnet on certain interface. However, I'd like to ...
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1answer
872 views

Linux Mint 12 on HP Pavillion DV7 - Wireless is not working

I just installed Linux Mint 12 using mint4win just to test it out. I have a problem with my wireless connection. When I start Mint, it sees the network I wish to join, I select it, enter the correct ...
1
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1answer
1k views

How can I force a tap/tun interface into the running state?

I am trying to capture packets on a tun interface with libpcap. I am creating the interface with: openvpn --mktun --dev tun0 When the adapter is setup it appears as so when I run ifconfig: tun0 ...
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1answer
900 views

Linux workstations intermittently lose internet connections

About three months ago, a strange phenomenon started happening in our network. Firstly, let me describe the network layout (only the details which I think I'll be allowed to divulge): We have a ...
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2answers
853 views

Configuring network settings manually in Qubes OS

I'm trying to setup Qubes OS on my desktop but struggling to get the network/internet working. This is the configuration i want to setup - ip - 192.168.1.2 Subnet - 255.255.255.0 Gateway - ...
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2answers
617 views

xfce4 netload plugin, monitor on all interfaces?

Is it possible to monitor all interfaces with xfce4's netload plugin? Currently I can only place one interface name on it.
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1answer
7k views

VirtualBox guest using Bridged networking unable to obtain DHCP address

I have a computer, called Loki, that works as a virtual machine host and DHCP server. The DHCP daemon is listening on port eth0. Part of /etc/dhcp.conf: subnet 192.168.13.0 netmask 255.255.255.0 { ...
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2answers
3k views

Netboot - How to set a static IP

I've modified a CentOS net install image to load my kickstart file over http. This works great when running on a network that has a DHCP server. Obviously, without DHCP this fails because the ...
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4answers
14k views

Reverse DNS lookups slowing down network operations on LAN

Environment My LAN setup is quite basic: A router connected to the ISP's modem and the internet My development pc directly connected to the router The router provides DHCP but does not run its ...
12
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3answers
23k views

VirtualBox: two network interfaces (NAT and host-only ones) in a Debian guest on Ubuntu

I created a Debian VM on VirtualBox with two interfaces: a NAT one (for accessing internet) and a host-only one. However, I do not know how to make both interfaces work at the same time. If I the ...
11
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3answers
1k views

How to open a port early in boot process to unlock LUKS via SSH

I have a fully encrypted server running Debian 7 and have set up dropbear and busybox to unlock the LUKS container via SSH (as described in this tutorial and in this U&L answer). Unfortunately, ...
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1answer
342 views

How to set default printer settings without driver

I am not at all an expert Linux user, but I do network and applications support for an office technology company. One of our clients is a pharmacy which prints prescription labels through software ...
4
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2answers
412 views

ls behaves differently under strace

I don't know how to debug this situation: 1) I try to execute: ls /home/user 2) ls blocks and does not print anything. I assume it is because /home/user contains /home/user/sshfs_files, which is ...
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2answers
2k views

linux multiple internet connections load balancing with fail handling

I have two ISP connections and need automatic load balancing between them. I also need to handle failed connections (not use one that does not work). First link is a PPTP connection (ppp0), second is ...
3
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1answer
663 views

Ubuntu automatically connects to a wireless network when its already connected by eth0 to the same network

I use Ubuntu 11.04, and I work at an institution which has wired and wireless connectivity. My computer is set to automatically connect to the wireless network if it is available. When I am plugged ...
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2answers
5k views

How to configure network profiles in Centos?

I'm trying to setup two network profiles in Centos. One for at home, one for at work. The home profile has a fixed IP address, fixed gateway and DNS server addresses. The work profile depends on DHCP. ...
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3answers
10k views

Find out network traffic per IP

We have one central server which functions as an internet gateway. This server is connected to the internet, and using iptables we forward traffic and share the internet connection among all computers ...