Managing and using network connectivity on a unix system

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1answer
388 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> ...
7
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3answers
3k views

How to know if a process is attached to a tap interface?

I sometimes come upon machine with tap interfaces (eg, when KVM is running). How can I know which process is attached to the TAP interface?
2
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1answer
72 views

Is it possible to echo characters directly to network?

Even when this is a network problem, I would say this is rather a Unix/Linux experienced users question. I am trying to manually send a network magic packet by using echo and redirectors (file ...
2
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2answers
211 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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2answers
7k views

Limit outgoing bandwidth on an specific interface

I would like to know the easiest way to limit outgoing bandwidth for an interface. I want to cap the outgoing port speed so that file transfers between my servers don't fail during busy hours. What's ...
0
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1answer
19 views

Install brctl for OpenWrt - which package?

I'm getting an error in OpenWRT Attitude Adjustment that says: -ash: brctl: not found when I run brctl addif br-lan mesh0 I tried: opkg update opkg install brctl But I got this error: ...
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1answer
747 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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1answer
53 views

NetCat ignoring (not sending) network data to broadcast addresses

If I run these NetCat below commands (no error messages at all) during a WireShark capture running (capture filter= udp dst port 4000) : luis@Zarzamoro:~$ echo "Hello" | nc -w1 -4u 255.255.255.255 ...
3
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1answer
78 views

Bash: Permission denied when trying to echo data directly to Network

I am trying to send characters directly to the network stack as explained in this thread. Even when the process work OK under CygWin (Windows), the same lines do fail on Ubuntu v14.04: ...
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52 views

Realtek RTL8111 Network card not working on Ubuntu 14.04

I'm trying to install an Ethernet Card into my Ubuntu 14.04 desktop computer. Here is my lspci output (First one is my new ethernet card): 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. ...
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3answers
3k views

How to install Redhat using the iso image stored on Network

This is the case. I want to install the Redhat 5.6 on my system. But this time i dont want to use the actual DVD but this time i want to install it using the iso image stored on one of our server HDD. ...
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1answer
37 views

Set up interfaces file on Debian for Lan

A friend set up my Raspberry Pi so that it creates its own wireless network and I can connect to it through SSH over the air. The /etc/network/interfaces file looks like this: auto lo iface lo inet ...
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1answer
26 views

Loop commands to network daemon?

I'd like to feed a network daemon using a loop! To be more specific: There is a network daemon listening on localhost:portx. The daemon expects me to guess a PIN between 0000 - 9999. I want to use ...
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1answer
33 views

Turn off network on Raspbian

I'm trying to set up cron to turn off networking on my Raspberry Pi during the night (from 23:00 to 8:00). The problem is that none of this commands do the job: $ sudo service networking stop $ sudo ...
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4answers
59k 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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0answers
14 views

Connection issues serving as WiFi access point with no internet [migrated]

I'm not sure how to phrase the problem as a question so suggested edits are welcome. Setup: I have a raspberry pi running raspian with a wifi dongle. I've configured everything to run as a wifi ...
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3answers
80 views

Internet connectivity issues due to wrong MAC address (using Linux Mint 17.2)

I am new to Linux. Today, I installed Linux Mint (17.2) and tried to connect to the internet via a broadband connection. My Internet Service Provider (ISP) provided me with a fixed MAC address that ...
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1answer
987 views

What do I need to add a virtual IPsec adapter?

I'm trying to set up an IPsec connection manually from the console with iproute2. What I need is a virtual interface (at best, a virtual IP address could also be sufficient) that IPsec-transforms ...
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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?
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1answer
24 views

How to get systemd-udevd to create a bridge device at start up?

I am running Ubuntu server 15.04 in a virtual machine. I am able to use the brctl program to create and manipulate networking bridges. I've decided to persist the setup (through reboots) by updating ...
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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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2answers
802 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 ...
2
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1answer
28 views

How do kernel inform OSPF daemon when a physical interface status is down?

When a physical interface status is changed from up to down, there are 3 things related to the computer's current routing table and OSPF. The (connected) network for that interface and remote ...
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1answer
65 views

Routing tables with two network interfaces

When I try to access the internet with my raspberry pi via ethernet, it works, but when I do ifdown eth0 and try to ping any server outside my home network, it tells me connect: Network is ...
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0answers
35 views

enable/disable domain redirection

My router can be joined by clientes. enable // I'd like to redirect all trafic to an IP (13.37.42.1), I mean any IP and any domain. disable // Then I d like to be able to disable it. Then clients ...
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0answers
43 views

Difference between MTU for a route and MTU for an interface

There is a server I connect to over the WAN and somewhere over the route there is packet loss unless I set the interface MTU to 600: ifconfig eth0 mtu 600 Doing this causes problems with ...
2
votes
1answer
40 views

TFTP times out when connecting to Docker server

I'm trying to install FOG in Docker (via boot2docker for Windows) at my workplace as a bit of a learning exercise. FOG has a handy little script that installs everything for you, and that works great ...
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24 views

atheros driver on arch-linux won't start access point [closed]

Can't create access point on arch % lspci -k | grep -A 3 -i network 06:00.0 Network controller: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter (rev 01) Subsystem: Dell Device 020c ...
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0answers
29 views

Linux VM as a firewall

I have 3 vms a->b->c. I want to setup b as a firewall. Traffic is routed from a to c through b and I put a file on c. How do I show that b works as a firewall (first show that you are able to transfer ...
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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
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1answer
2k views

Ubuntu: wire network is not stable and must restart network-manager periodcally

I don't know why my wire network now is not stable. After a short time of using, maybe 30 minutes, 15 minutes or maybe just 2 minutes, my network is down. When my network is down, I must run this ...
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0answers
23 views

Browser is ok but can't direct internet through a shadowsocks server

Ok it seems an easy thing but I just couldn't make it work after lots and lots of searching. I have Ubuntu 14.04. This is config.json file including configurations of my friend's server running ...
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0answers
10 views

Wi-Fi Sabrent PCI-8021N Linux Debian Jessie _x86_64 using ralink firmware/desktop

I've been trying since Thursday to get a sabrent card to come up and show what wifi networks are available. I'm in midtown Atlanta...so seems there should be 1 or 2 networks showing. The card's power ...
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0answers
12 views

How can you remote boot over InfiniBand?

If I have InfiniBand adapters in two computers, an InfiniBand cable between them, and all of my hard drives in one of the computers running the necessary host software (iSCSI/SRP/etc), how would the ...
1
vote
1answer
799 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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0answers
49 views

How to get an RPi2 running Kali to tether to an iPhone 5S?

I’ve got Offensive Security’s version of Kali Linux running on a Raspberry Pi 2 and I’m trying to tether it to an un-jailbroken AT&T iPhone 5S. From my research it looks like I need to install ...
1
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1answer
2k views

Using ping on multiple interfaces on a NIC

I have two systems and each have a NIC with two ethernet ports. One system has a verified NIC card, but the other has a NIC which has to be verified. I use ping to verify whether the interfaces on ...
2
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2answers
85 views

Keep losing resolv.conf configurations

Every time i reboot raspi this resolv.conf files is cleaned. i normally add on this file the openDNS ips like below: # OpenDNS IPv4 nameservers nameserver 208.67.222.222 nameserver 208.67.220.220 I ...
18
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7answers
2k views

Why compute checksums of downloaded files?

I often see a checksum given next to a file available for download. The purpose of this practice eludes me. It is obviously to detect corrupt files, but what could be the cause of this corruption and ...
3
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1answer
15 views

Enabling proxy_arp for interface eth2.1

Am trying to enable proxy arp for some of the interfaces, with the normal interface name eth0, eth1, etc [root@eth2.1]# sysctl net.ipv4.conf.eth0.proxy_arp 0 But for interface names such as ...
1
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3answers
11k views

I always need to ifdown/ifup wlan0 after reboot

I'm trying to create an ad-hoc wifi made of 5 computers (one windows pc and 4 raspberry pi loaded with a raspbian) the raspberry pi will talk through mqtt, but tha'ts not the point. The problem I have ...
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0answers
18 views

Can't ping another router in my network (OpenWrt)

I'm playing around with OpenWrt and followed this tutorial step by step to set up a mesh network: http://wiki.openwrt.org/doc/howto/mesh.80211s Problem: When I got to the end and ran these two ...
3
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3answers
5k views

Multicast UDP not working

Multicast UDP on raspberry pi I haven't narrowed things down enough to know if my issue is because of debian, raspbian specifically, or if I am just missing a something completely. I have a python ...
0
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1answer
23 views

OpenVZ machine's venet0 network suddenly down

I have setup a further OpenVZ container with the following network setup: venet0:0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:192.168.10.168 ...
1
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1answer
2k views

Trouble switching from DHCP to a static IP on Kali Linux

When I installed Kali Linux 64bit, I forgot to set up a static IP address, and now DHCP determines my address with my router. I have already modified /etc/hosts and /etc/network/interfaces to declare ...
0
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2answers
48 views

Disable DHCP without altering 'interfaces'

I have a bunch of RPis running in read-only filesystems that are not able to modify the /etc/network/interfaces file. As of right now, they load their configurations off of a USB stick and use ...
0
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1answer
25 views

How to send a NDP message?

I would like to send a NDP ( Neighbor Discovery Protocol ) message from my Mac on the network to discover which device is available or not. How can I do this ?
1
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1answer
77 views

Two network interface(eth0 and eth1) of same linux machine can't ping each other

I have one linux machine having two gigabit network interface. I want to run the traffic test like iperf on two interface, eth0 will be server and eth1 will be client. I connected back-to-back network ...
0
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1answer
25 views

Virtual NIC's in Linux?

How do I create a VNIC interface in linux? What I want to do is create an interface that is linked in some way to a physical interface but functions in its own namespace. I know the physical ...
3
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4answers
9k views

TFTP configuration problems

I can not get TFTP to work properly on my system. I have set /etc/default/tftpd-hpa to /srv/tftp/ which I have set to permissions 777 like all the contents as well (and /srv/ too) however, whenever I ...