Managing and using network connectivity on a unix system

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Unable to connect to wifi “IPv6: ADDRCONF(NETDEV_UP”

When I click on the wifi icon and the hotspot I want to connect to, nothing happens. Nothing at all. And here's my dmesg: [ 9647.582070] IPv6: ADDRCONF(NETDEV_UP): wlp4s0: link is not ready [ ...
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27 views

Different IP addresses, same interface

I have a Raspberry Pi and I have configured the wifi interface with static IP - 192.168.0.110. It worked fine, on every restart it got this IP. But this beautiful morning I restarted the Pi and ...
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1answer
39 views

Linux Mint LAN Connecting But Not Working

I am new to Linux and working on Linux Mint 17.2 on my laptop. I am able to connect using LAN wire (i.e. on the right bottom it shows connected) but not able to access the internet. It works great on ...
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30 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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81 views

OpenVas + Kali Rolling: The connection was reset

I am trying to get OpenVAS to work in the latest Kali release (rolling). It seems to be installed right, but when I try to access the web interface (127.0.0.1:9392), I get Connection was reset. ...
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39 views

Kali on VirtualBox w/ Bridged Network Stuck on Connecting

I've just installed Kali on VirtualBox w/ Windows 10 as the host. Everything else is fine except for one problem. I tried to bridge a connection from my host system's WiFi adapter to the VM but the ...
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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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66 views

Host-only network adapter (enp0s8) not starting on boot in CentOS7

I've installed CentOS7 in virtual box. I've 2 network cards - one host-only (vboxnet0) adapter enp0s8 (which I want to be static) and the other the NAT adapter enp0s3. The host-only adapter never ...
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2answers
59 views

hostname for computers in LAN

I am using Raspbian (like Debian) and I used this tutorial https://frillip.com/using-your-raspberry-pi-3-as-a-wifi-access-point-with-hostapd/ to setup my Raspbian as a wifi access point. Clients can ...
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2answers
54 views

Retrieve name of the active network interface only [duplicate]

How can I retrieve from the command line (or a shell script) only the name of the active network interface, in Linux? If there are several active interfaces, I want just one (selected arbitrarily).
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104 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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1answer
109 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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0answers
38 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
64 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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19 views

Setup for host and vm ,vm to vm connection

How do I setup network of my oracle virtual box so that below possibility is achieved Setup : 1)Oracle virtual box is setup on windows host 2)Virtual box has two vm's (Vm1,Vm2) Goal: 1)Host ...
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114 views

A way to setup hotspot in Kali Sana (Kali 2.0) via XFCE

I'm finding it extremely difficult to figure out to create a successful hotspot using Kali Sana after having it updated to XFCE, installing all updates via apt-get install update. I've tested the ...
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1answer
70 views

Kickstart install problems, ethernet configuration missing

Using CentOS 6.7 I've created a custom(and working) kickstart installation. Initially I had coded the configuration for eth0 in the kickstart file, but ideally I'd like the user to input it, but it ...
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1answer
27 views

IPV4 getting removed after restart CentOS machines

I have CentOS machines (both 6.x and 7.1) and whenever I reboot them, automatically IPV6 is assigned to them and IPV4 is lost. Any idea why it is happening and how to prevent it? I Could not ...
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1answer
38 views

How do you block a port on your loopback?

I am doing some testing and want to be able to test situations where my database goes down. Its running on the same box as my tests, and it appears that things like the following are not doing the ...
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1answer
62 views

How to install Debian with a network that uses WPA2-Enterprise MSCHAPv2 EAP-PEAP (username/password)?

I am currently trying to install Debian on a laptop and due to firmware incompatibility, I am using the non-free netinstaller which can be found here. I cp'd it onto a USB (not a partition) and booted ...
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1answer
44 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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1answer
38 views

I am stuck connecting to the internet via a usb wifi stick

I am trying to set up a an internet connection through a usb wifi sticker in Linux. Here's the sequence I tried: iw dev This returns the name(?) of the Interface that I want to connect to: phy#0 ...
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1answer
40 views

ip tables by route command and iptables's table by iptables command, is the same?

There are two command : route, and iptables. Both of it have a/many tables: route tables and iptables's table. Does those two kind of tables describe the diffrent thing, or iptables can also be ...
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1answer
21 views

Connect VM from Internet

I'm new to Linux and I have created a RedHat6 VM using Oracle VirtualBox. For testing purpose, I have set it up so that I can connect to it from my local/host Windows machine (and those of my friends ...
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1answer
54 views

How to directly connect two machines over ethernet without static IPs?

Question: How can I set up two machines, so that when I directly connect them together with an ethernet cable, one machine can connect to the other? I'm looking for a solution that does not involve ...
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2answers
198 views

Understanding wpa_supplicant

TL;DR. I need help getting to the bottom of: why there are errors related to ioctl when using wext driver, why I'm not able to use nl80211 driver. When running wpa_supplicant I get weird errors ...
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46 views

linux red-hat 7.1 + increase the ring buffer

My target is to increase the ring buffer ( I have Linux red-hat 7.1 ) , but I get the following: ethtool -G eth1 rx 8192 Cannot set device ring parameters: Invalid argument so how to enable this ...
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15 views

Achieving UDP communication through two tuntap inerfaces

In my linux machine on to VMware workstation, I have two network cards (NIC's), named as eth0, eth1. Also, I want to create two tun(taps) interfaces. I want to achieve the udp datagrams to be sent ...
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1answer
64 views

Why doesn't rate limiting with trickle work with ruby?

I'm attempting to limit the bandwidth available to a running ruby process to prevent it flooding our link and affecting other traffic. The process is downloading large files over HTTP. I've found ...
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37 views

CJDNS `Network is unreachable`

I'm not shure if this question belongs here, but anyway. I was trying to run cjdns on my android phone (OnePlus One runnig CyanogenMod 13) (actually tried on several devices), but it ain't working. It ...
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13 views

Adding IP Blocklists to OSSEC

I've been reading through some documentations for OSSEC trying to learn some new tricks and such to make it more effective, and what I got really interested was looking into was seeing if it's ...
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42 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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1answer
48 views

KVM bridged interfaces not going up - inet, inet6 , bridge

I am setting up KVM host which will have multiple virtual machines visible from the outside with a similar /etc/network/interfaces config to this one # The loopback network interface auto lo iface ...
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1answer
68 views

How to run a script after OpenVPN initialization is completed?

Background: I want to check the speed of the various servers of my VPN provider and wrote a script which runs iperf3 for each of the servers. The script does not modify the networking setup in any ...
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18 views

Nast port scanner showing wrong results?

I'm trying to do a port scanner with nast. The command I'm using is: sudo nast -S. Later I have to introduce the IP and the port range 1-2000. The problem is that with some IPs it gives me a wrong ...
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1answer
22 views

KVM Networking Topology

I would like to set up a network on my Server where I run KVM as a hypervisor. The Network will be used for a distributed Jenkins setup. The goal topology is the following: One machine (Jenkins ...
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2answers
94 views

default netmask in Solaris

On a Solaris local zone, what is the default netmask? I have a blank /etc/netmasks file, but if I run ifconfig I can see that the netmask is set to ffffff00 . [username@servername]# ...
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1answer
79 views

CentOS “service network restart” FAILED - where is the error log?

In CentOS, I ran the following command. But it doesn't give me explicit errors to investigate. How can I troubleshoot further or find the errors? service network restart
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16 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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1answer
56 views

VMWare vSphere packet loss

I have a Dell Blade Enclosure with 14 blades and ESXi 5.5 on it. On blade 7 and 14 I have round about 65 % packet loss when I ping the ESXi Management interface. On all other blades there is no packet ...
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2answers
166 views

Meaning of “route add -host xxx.xxx.xxx.xxx dev eth0:1”

if the format is: route add -host 192.168.1.20 gw 10.1.1.20 dev eth0:1 I know, It will route 192.168.1.20 to 10.1.1.20 Then, what's the "dev eth0:1" mean?
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1answer
100 views

redirect to localhost using iptables

I'd like to redirect the outgoing traffic (whether coming from localhost or elsewhere, as the machine is a gateway) going from 192.168.0.2:80 to localhost:80. I've tried setting this rule in the nat ...
2
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2answers
71 views

ssh reverse tunnel with remote ip

From a server 192.168.0.1, I'd like to reach a server 192.168.0.2 on port 80. 192.168.0.2 can reach 192.168.0.1, but 192.168.0.1 can't reach 192.168.0.2 (firewall). I have set up a reverse proxy, by ...
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2answers
123 views

Monitor and limit internet bandwidth per network client

On a linux server with dhcpd that acts as the internet gateway for all clients of the LAN: how can I monitor the internet usage based on IP/MAC address, and deny internet access if a certain bandwidth ...
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41 views

iptables Dynamic SNAT, how to force to use different src ip from pool?

Requirement: I need to translate a private-ip range to a public-ip range while going out on the internet. It should be a one-one mapping, if public-ip range exhausts it should drop to the next nat ...
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2answers
43 views

Fedora Core 4 won't get an IPV4 address

I have a fedora core machine, and it is picking up an IPV6 address, but not an IPV4 address. I have done dhclient -r eth0 but the ipv4 address has not come. I have reset the port using ifconfig, but ...
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2answers
62 views

No internet on Linux Mint 17

I have been using Mint 17 for the past 2 months now and it didn't show any problem in networking. Recently, however, when I connect to WiFi it works fine for a while, but when I leave the system idle ...
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0answers
77 views

Simulate a network cable unplugged without login all routes

I want to simulate unplugging a cable from a Linux instance. My initial response was ip link set eth0 down. However, this command has impact on higher-level networking functions, e.g. routes ...
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109 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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1answer
34 views

How to switch generic routing to source routing?

I will need to do source routing and before going into more complicated setups I want to understand how this works by switching the generic routing (the one created magically by the networking setup) ...