Managing and using network connectivity on a unix system

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forcing proxy traffic to route via a specific 3G dongle interface

I've searched for details on how to do this but I've been unsuccessful - I wondered if someone could offer up some advice. I have 2 network cards (LAN and 3G in my case), LAN is my main interface ...
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24 views

Why does a connection from my LAN to my public IP address fails?

I have an OpenVPN server on server. It is available from Internet via a two NATs: first the ISP box relays to 192.168.0.10, then 192.168.0.10 relays to 10.10.10.254 (relays = DNAT). I can connect ...
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13 views

KDE's network applet not listing APs, while iwlist does after some extra steps

KDE's network applet doesn't list any wireless network. It used to, but I must have made an unintended change. This much I know about my situation (the device is called wlp4s0): Upon login, the ...
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17 views

What does it mean 10.171.10.1 --> 10.171.10.2 in openvpn-created interface?

I have installed OpenVPN server in FreeBSD and it created interface, visible by ifconfig: ovpns4: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1500 ...
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32 views

Kali linux network error

I'm new here and I'm from Tunisia so my English is my 3rd language so forgive me for my bad grammar mistakes. OK, I have Kali 2.0 linux (32bit) installed in windows 8.1 (32bit) (dual boot, no VM), ...
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59 views

TCP SYN,ACK Retransmissions

The following network trace was recorded on a Raspberry PI running Debian Linux. It seems the Raspberry is not seeing the data packet #36995 for some reason; it is just stupidly repeating his SYN,ACK ...
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10 views

OpenVPN maintain connection state during tunnel reconnect

Sometimes I want to do a short maintenance like restarting a tunnel, all connection running on top such as file transfer...etc will receive connection lost signal, is it possible to maintain those ...
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16 views

'ip netns exec' command execution using nsid obtained from 'ip netns list-id'

I have previously used ip netns exec command to modify netns interfaces. But if there is no name associated with a netns (eg: docker), how can I use nsid result of ip netns list-id command for ...
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25 views

How Would I Appropriated Add this Route?

I've got an ASUS RT-AC66u running an OpenVPN server working fine. But on my debian server I have to add a route or else I get no responses. Just curious if there is a way to add the route to the ...
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24 views

I cannnot connect to guest os(protostar) through ssh from host-pc (linux mint)

I'm trying to connect a to guest machine (protostar) through ssh from my host PC (Linux Mint). I'm using VirtualBox. I tried: setting up hostonlyadapters. setting up NAT Networking. ...
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34 views

qemu-system-arm problems adding second NIC/bridge

I am running Qemu under a host with two bridge interfaces and would simply like to bridge them to guest NICs. All of this works fine when bridging one NIC either by creating a bridge manually or using ...
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55 views

Is there a utility that allows to create structured data from tcpdump hexdumps?

Sometimes I have to use tcpdump to troubleshoot problems with networking protocols that tcpdump does not know how to parse. Is there a utility that could read tcpdump packets in hex dump format and ...
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29 views

How to determine the logical type of a linux network device

with logical I mean everything legal in the command ip link as in, for instance: ip link add link dum0 name dum0.200 type vlan protocol 802.1Q id 200 where the logical type would be "vlan". All ...
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20 views

I am redirected to a router that is not part of my provider's configuration [closed]

Whenever I try to access a website with a .com domain it shows the 'unable to connect page' but when I access a site with my country's domain I get redirected to a Tenda 11N wireless router. I ...
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77 views

How to set static IP with fallback to DHCP

On /etc/network/interfaces (Raspbian), is it possible to set a static IP with optional fallback to DHCP? That can be handy in case the configured static IP is already taken. Or it could be in a ...
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37 views

Hostname won't resolve after setting up new server

I just completed a fresh install of Centos 7 on a PC. It is connected to the campus network, so I am not in control of the DNS server. I gave it a hostname by setting the HOSTNAME value in ...
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2answers
54 views

Network has no ping and can't resolve hosts

This is the config on /etc/sysconfig/network-scripts/ifcfg-eth0: DEVICE=eth0 TYPE=Ethernet UUID=c7sdfsdf-dfgdgdfgdgd-dg ONBOOT=yes NM_CONTROLLED=yes BOOTPROTO=static IPADDR=x.x.x.x ...
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35 views

How does FING (or any of the IP/MAC Address Mappers) work?

Per this comment, I am going to take advice and ask this as a separate question. I am trying to learn more about networking and security and want to play with tools to help increase my understanding. ...
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41 views

Red Hat vNIC(Virtual NIC) association to physical NIC

I have a virtual network interface named bond0.700 connected to a vlan (ID 700), and 6 physical NIC (eth0 to 5) on RHEL 5.5. Hint : [root@rhle ~]$ cd /sys/devices/virtual/net [root@rhle net]$ ls ...
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15 views

Is there a tool or a command to change the “tagtype” from VLAN tags (single and double tag) before sending the frame over a VLAN Interface?

I have to talk to a device in a VLAN network. It requires that the tagtype field of both VLAN tags are the value 9100 or it refuses to answer. Thanks
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69 views

Force OpenVPN to route all traffic through one IP address (2 IPs on same NIC)

I've trying to dig up a solution for this, but all I keep turning up is how to bind OpenVPN to a particular hardware interface. Not quite what I need to do here. I run a server and I have 2 IPs at my ...
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33 views

Weird connection: wired and wireless

On my machine, I do have one internal wifi device. Also I had connected wired cable. I configured both of them to have ip from DHCP and both of them working fine. But, whenever I disable the wired ...
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1answer
127 views

Network Manager error - “cannot send router solicitation”

I see this error occuring for network manager, but only after the laptop goes to sleep mode, and I come back to wake it up. NetworkManager[2040]: <error> [1456121915.287806] ...
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24 views

No internet connection after reboot

I rebooted my vServer (Debian 8) and it doesn't came back up. Well, I used the rescue console on my server and the server seems to be running fine, except the network was broken. So I tried 'ifconfig' ...
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100 views

Cannot connect via ssh to server with global IP address

I have the no-ip service running on my raspberry pi, it updates the DNS (no-ip) whenever there is a change to it's IP address. I have enabled port forwarding on my router (Asus rt-n66u) ports 22 ...
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1answer
31 views

unable to add IPSec IKEv2 profile on Fedora 22/23

it should be something really simple, but I cannot add IPSec IKEv2 profile in Network Manager settings, Add button is greyed out. Does anyone know?
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1answer
111 views

Is that possible for debian users to connect to network through systemd-networkd?

Systemd offers the ability to manage the network by itself without additional tools such as netctl or NetworkManager. I am running debian 8 and i need to configure my network using systemd-networkd ...
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84 views

ssh-ing to remote machine connects me back to local machine?

I have two computers: my laptop, vagrant, and my desktop tower, frontier. My username for both is joseph. I can ssh just fine from frontier to vagrant, but I have never been able to do it the other ...
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33 views

avahi : How to associate hostname with address of eth0:avahi generated by avahi-autoipd?

am using avahi on a freescale imx6 board with a custom linux system (build by buildroot). So I use avahi for address allocation (eth0:avahi) and hostname resolution. My freescale imx6 board also uses ...
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35 views

How do I specify an alternative bridge interface (not br0) when using qemu-bridge-helper

By following the instructions found at http://wiki.qemu.org/Features/HelperNetworking I can configure qemu with qemu-bridge-helper, however, I can't figure out how to pass a bridging interface option ...
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1answer
34 views

Connecting to WPA network in FreeBSD

For whatever reason I am having a very annoying time just trying to connect to a network in FreeBSD. So the question is how would someone manually connect to a wireless WPA network in FreeBSD 11.0? ...
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71 views

Setting up bridged adapter for Arch guest, Windows host [closed]

I've tried many things that I've found online but I'm stumped. I'm using VirtualBox, my guest OS is Arch, kernel version 4.4.1-2, my host is Windows 10. When I set it to have NAT adapter, I get it ...
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48 views

“link is not ready” error, vanishing network interfaces

I recently had a weird problem when trying to use airmon-ng. Here is its description: First, I plug in my USB WLAN adapter, and type ifconfig. Everything goes well and I see all interfaces are ...
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1answer
77 views

Debian Jessie server has no internet access

I have a server running Debian 8 Jessie that constantly loses it's internet access for seemingly no reason. The server has two wired connections, the internet access is on eth0 and the internal ...
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1answer
32 views

Connection is not established again after disconnect-connect ethernet cable

I have a situation where I have two devices connected to each other via ethernet interface, problem comes when I disconnect cable and connect them again after some time (it starts to work normally ...
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47 views

CentOS 6 - Order of network interfaces when running “ip address show” command

I have installed CentOS 6.7 on new HP Gen9 server and decided to rename interfaces using udev so they are in order eth0-7 from left to right when looking at servers back (originally interfaces were in ...
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1answer
133 views

SSH/SCP Connection problem | Lost connection

We are unable to ssh or scp to a particular host, SSH Connection hangs for a while and then gets disconnected and we get this error "Lost connection" All the hosts are CentOS 6.7 Openssh version ...
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57 views

Why is my rsync slow?

I run a rsync job transferring about 45 million files/approximately 1.8 TB data (a Mac OS X Time Machine backup) over a 100 MBit connection. I use rsync 3.1.1 from MacPorts (I first tried the built ...
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13 views

Create Network Interface That Redirects All Traffic to Actual Interface

I would like to create a network interface on my Arch Linux host for a VM to use (probably QEMU) so I can use iptables to firewall all network traffic in/out of the VM. The interface should send all ...
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30 views

How to advertise a service on a port

I want to run a service(a server typically) on a host and it should advertise to other machines in the network. Let's say I'm running a ReST service which provides the temperature based on location ...
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50 views

Netcat server/client for a social thread

I have been learning nc for a while now, and I decided to make a social thread server for it in bash. Surprisingly, I got it working, but I have a couple problems with it. My main problem I want to ...
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42 views

working netgraph configuration for ipfw and ng_bpf on FreeBSD

I'm trying to get a raw BPF bytecode packet filter working on FreeBSD using a combination of ipfw with ng_ipfw, ng_bpf and ng_tag. However none of the documentation or presentations I can find ...
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34 views

how does one force the network service to use an updated interface file on system start

I've got an application that we deploy via ovf template. I have it set up so that a customer can enter the network settings into vSphere and they come through via ovfTools. All that works just fine. ...
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46 views

1:1 NAT through VM VPN

I've got a few client servers that I connect to with different VPN clients (e.g. Cisco, OpenVPN, etc). I'm trying to set up an Ubuntu 14 VM (with VPN client permanently connected) for each server to ...
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87 views

Pipe Text Into and Out of Netcat Server Using mkfifo

I wanted to make two pipes for a netcat server that inputs text into the server, and one that outputs text from the server. I have the server running in a seperate script with the input and output ...
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1answer
69 views

Kali Dns Problems

I have a problem. So, when I connect to any wi-fi station I can't use google or yandex. I solved that. The thing was in dns. I added google dns servers to 'resolv.conf' and it worked fine. However, ...
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22 views

Can't access website from other networks

I am trying to open a website since I was told to use and they gave me some tasks to do from there. I have always been able to use it from my work network, but not from other networks. And the guy who ...
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36 views

Deleting / renaming a network hardware port in OS X / Darwin

This is a problem that so far no one at Apple.SE could help me with, so I'm just gonna give it a shot to ask it in a different form over here. (I hope I'm using the right SE site... or is this better ...
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165 views

Why are routes set in /etc/network/interfaces not added when the interface comes up?

Here is my interfaces file: auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp auto eth0:0 iface eth0:0 inet static address 10.20.8.231 netmask 255.255.255.0 ...
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87 views

How can I enable jumbo frames on a bonded Xen bridge interface?

I have a Debian Jessie 8.2 server serving as an Xen VM host. The server has two physical network interfaces that are bonded together using LACP. There is also an xenbr0 interface. I would like to ...