Managing and using network connectivity on a unix system

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Setting gateway to dynamic IP

My home router (given by ISP, must use it) does not accept static IP connections. I need to set the gateway for eth0 pointing to wlan0. I've succeeded in setting gateway in etc/network/interfaces/ to ...
2
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1answer
559 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. ...
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2answers
31k views

Host unreachable and I do not get why

I can not open a specific website. This is a website hosted by our company, and I know it is up. However, these are my symptoms: VARIABLES: host.com - the website I can not open x.x.x.x - the IP of ...
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1answer
29 views

How to return Uptime of successful OpenVPN connection

I'm trying to figure out how to return the UP Time of a successful OpenVPN connection. I've tried different variants of the following code: #!/bin/bash TMP=$(grep 'tun0: link up' /var/log/syslog* | ...
1
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1answer
61 views

How can I create Local Loopback on Linux (Red Hat or Debian)?

How can I do the same on Linux (RedHat or Debian)? I need to create local loopback as shown herein: Performing Loopback Testing for Fast Ethernet and Gigabit Ethernet Interfaces. Excerpt ...
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2answers
55 views

how to test if can connect to port in rhel 7 (telnet client?)

On my local machine some network application is launched on port 3333 and I want to check that it "accepts connections". In this case in Windows I just type telnet to launch telnet client, and then o ...
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4answers
6k views

Is there a way to set network proxy system-wide?

If I want to have GNOME applications (as well as Firefox and Chrome) access the network through a proxy, I need only use gnome-network-properties (a nice and simple GUI I must say). For other apps ...
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2answers
1k views

Split DNS (bind9), match-clients any doesn't work?

I've been fighting with this for the last few days. A few of my entries have external and internal IP's. My internal network is 10.0.0.0/8. When I nslookup pc1.clase.net internally it responds with ...
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1answer
1k views

Consistent network interface name ubuntu using pci slot

One can set consistent interface naming via mac address by modifying /etc/udev/rules.d/70-persistent-net.rules. Can you establish consistent interface naming by PCI slot number? (I tried but failed) ...
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2answers
9k views

eth0 not being configured automatically

When I start an ubuntu 12.10 instance, eth0 is NOT getting configured. davidparks21@MySqlDB:~$ cat /run/network/ifstate lo=lo When I manually edit ifstate and add eth0=eth0 and service restart ...
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1answer
36 views

How can I debug traffic on a switched network with Wireshark?

I have an IP phone on my home network that I am trying to call using SIP from outside of my home network. I have port forwarding setup, but the phone is responding with a SIP 404 message. All the ...
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1answer
2k views

Networking and Samba from a quest OS running on qemu

I'm trying to test some software on a big endian system to ensure compatibility. My plan is to use qemu on Ubuntu 12.04 to emulate a MIPS system. So far I've been able to create the quest system ...
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1answer
976 views

Set up network with static IP and wpa_supplicant on Debian

On Debian, I am trying to set up my network to use ad-hoc mode with a static IP address. I also want wpa_supplicant to be running so that I can scan use it to scan for WiFi networks in range. To get ...
2
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1answer
815 views

Why does't stopping the nginx server kill the processes associated with it?

When I stop nginx like this on ubuntu 12.04, I get the following errors: $ sudo service nginx stop Stopping nginx: nginx. $sudo service nginx start Starting nginx: nginx: [emerg] bind() to 0.0.0.0:80 ...
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0answers
20 views

Find out the cause of “Hard Block”

I have a Beaglebone Black I managed to install wifi drivers, find networks to connect to, but I always fail to do so. Apparently rfkill is setting Hard Block which is ( correct me if I'm wrong) ...
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2answers
734 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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1answer
35 views

trouble bridging tap0 and tap1

I have a GNS3 router that is connected to tap1 in my host. On the other hand, I have an user application connected to tap0 running locally in my host. I can ping both the router and my application. ...
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1answer
479 views

Raspian, Huawei E303, Public IP address

After configuring Raspian linux and a Huawei E303 3G USB stick, I am stuck accessing the machine from the Internet by its public IP address. Details: The E303 stick was configured to work as an ...
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0answers
29 views

How to exclude LAN traffic with iptraf-ng?

I'd like to use iptraf-ng to see how much data my machine is sending/receiving from the Internet, but I want to exclude traffic on my LAN as I am only interested in data going off-site. I have ...
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1answer
447 views

Arch Linux Ethernet to WiFi bridge

I want to use a Raspberry Pi running Arch Linux to extend my WiFi network. My situation is that I have a spare WiFi router that I want to use to expand my WiFi reception range as well as give me a few ...
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4answers
6k views

hostapd will not start via “service” — but will start directly

I am having trouble getting hostapd to start as a service. It fails when I try to start it: $ sudo service hostapd start [FAIL] Starting advanced IEEE 802.11 management: hostapd failed! From what ...
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0answers
28 views

How is it possible to send ping to all 127.0.0.0/8 successfully? [duplicate]

I have some wonders about 127.0.0.0/8 network and have 2 question about it. Firstly, why 127.0.0.0/8 is not considered as private network? I wonder this because wiki page does not mention about it. ...
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1answer
504 views

Networking between two Virtual machines on different hosts

I have openSuse installed as a virtual machine(Oracle Virtual Box) on DeskTop(win 7), and another openSuse installed on as a virtual machine(Oracle Virtual Box) on my Laptop(win 8.1). Please see the ...
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0answers
5 views

Cannot connect to the server through host machine that I created in guest machine in Linux Mint [migrated]

Using virtualbox I am running a server on Linux-Mint(guest) and client machine is windows-8 (host). When I try to connect to the server (which looks like http://169.254.158.126:8080) from windows-8, ...
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1answer
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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4answers
34k views

Why the default eth0 interface is down by default on CentOS?

I am already a little bit familiar with Linux distros like Debian or Ubuntu (yeah, very similar) but I wanted to try Red Hat based - CentOS 6.2 . I have installed it on my Windows 7 host in virtualBox ...
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2answers
567 views

keep losing IP with dhcpcd

I have an Arch Linux install in a VirtualBox VM, and as I'm working all of a sudden, it will lose it's dynamic IP address. When this happens, if I check on the status of the dhcpcd service it says ...
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0answers
34 views

Where to find a basic tutorial/book on Linux networking? [closed]

I am not sure this question is eligible for this forum, so if not, please provide which forum is more suitable for this question. What I am looking for is a basic introduction in how networks work ...
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0answers
35 views

how to route traffic on port to ip:port on linux?

I'm trying to route all traffic on port udp 5000 to udp 192.168.0.1:12333 with the following command: $ iptables -t nat -A PREROUTING -p udp -m udp --dport 5000 \ -j DNAT --to 192.168.0.1:12333 ...
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1answer
375 views

Using source routing (LSRR) - any ideas?

What I want to do is conceptually very simple, but I can't find any information or help about how to go about doing this. Basically, I want to configure my networking to use source routing (LSRR). ...
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0answers
51 views

VirtualBox guest machine as a nginx host

I have VirtualBox 4.3.12 with Fedora 20 and nginx 1.4.7 installed. Machine has Bridged Network interface and pings can be done both ways: from host machine (Windows 7) using ping 192.168.0.15 ...
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0answers
21 views

Where do the frame overruns come from?

I have a network setup like this: +------------------------+ | Switch | | | +---------+-----+----+---+ | | | | ...
2
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1answer
84 views

recvmsg returns 'EAGAIN (Resource temporarily unavailable)'

After a recent server move, we are troubleshooting this wierd issue of one of the server losing n/w connectivity for no apparent reason and regaining the connectivity in a few seconds or minutes. ...
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0answers
32 views

How to bridge a VM to public IP

I wish to to assign the IP from my eth1:2 to a VM; I also have no use of this IP for the host, it would be desirable to be exclusive to the VM. I've ended up with a setup just like this (eth1:1, ...
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2answers
54 views

How to get the list of ports which are free in a Unix server

I have a requirement to know which all ports in my Solaris machine are free to be used for any kind of network communication. I tried the netstat -a command. But the information returned didn't give ...
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1answer
1k views

Problems with Dell Wireless 5570 HSPA+ Mobile Broadband card

I've got a new Dell Latitude e7440, and a Dell Wireless 5570 HSPA+ mobile broadband card. I cannot get the broadband card to work. I can see the card: # lshw .... *-network DISABLED ...
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3answers
93 views

Generate networking configuration files using sed and bash

I am a bit rusty on my scripting abilities and am trying to find a good starting point for creating a script that creates files (generating new file names) and edits the IP address in the file by ...
0
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1answer
32 views

Understanding NAT concepts

I began learning networking on Linux, and I am looking for a way to associate a particular IP to a particular MAC address (i.e. a way to edit the NAT table?). Actually I am trying to assign some IPs ...
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0answers
20 views

Using PulseAudio to receive RTP audio stream

I'm trying to set up simple communication between my Ubuntu distro and my Rasbian distro on the raspberry pi. I'm more concerned about the rPi side of this project. I've been looking around the ...
0
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1answer
33 views

Understanding linux Bridging

I have started learning networking and recently been through bridging in Linux. Bridge in Linux could be set in two ways as far as I have got by reading on internet i.e. either by bridge-utils ...
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1answer
262 views

wget is unable to resolve host address 80% of the time

I have a wget 'http://xxxx.net/somepage.asp?params@abc' in a bash file. When I run it, four out of five times it says: Resolving xxxx.net (xxxx.net)... failed: No address associated with hostname. ...
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3answers
107 views

Bridge/Router with custom logic

I've a Linux box with 3 network adapaters, which I'd like to configure as follow: Adapter A is connected to computer A Adapter B is connected to computer B Adapter C is connected to the Internet. ...
2
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1answer
19 views

what happens during nic master failover?

During NIC master failover, will the mac address of bond0 change?
2
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1answer
90 views

reset Ethernet bonding without rebooting

I have the following Ethernet bonding configuration: old configuration: bond0 eth0 eth1 bond1 eth2 eth3 new configuration : bond0 eth0 eth2 bond1 eth1 eth3 I have made the ...
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0answers
22 views

Use more than one provider [closed]

I wanna know of it is possible to bond my network interfaces, so that I can use two or more different providers and combine the speed of those. Is this possible and how?
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2answers
700 views

Which user group can use the 'tap' net device?

I use the 'tap' net device with KVM to get my vm connect to the Internet. But I have to be root, or use 'sudo', which is inconvenient. I think I can put my user account into some group so I can access ...
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1answer
2k views

Setting up hostapd with a iwlwifi device to run a hotspot

I am trying to configure my opensuse 13.1 system to function as a hotspot (on my dell xps13 computer). So I tried setting up hostapd as explained here, but I get an error: hostapd ...
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1answer
16 views

Xen and Networking

I'm using Xen 4.1 I have a (debian) host with 1 ethernet adapter on 172.16.1.0/24 range, static configuration. I want to have various (centOS) guests, that will be on a different network: ...
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0answers
22 views

How can I display an altered Network-icon to show when downloading is in progress? [closed]

Summary: When downloading is in progress, how can I change the appearance of the icon (in the Panel) which shows that the Network Connection is enabled? I realise this means using a different icon. I ...
3
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2answers
763 views

WiFi not working after restoring from hibernation (authentication times out)

My Intel 6205 wireless network card does not work after hibernating. It sometimes also does not work on boot, failing in the same way. Occasionally, it also stops working after ~10 minutes of ...