Managing and using network connectivity on a unix system

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Network related services do not start correctly after using a systemd based networking [closed]

I managed to narrow the scope of this question to an IPv6 issue at boot time, basically the IPv4 networking is available but IPv6 isn't. Here is a new question for this issue: Systemd networking: IPv6 ...
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198 views

pfsense: squid transparent proxy not working in bridge mode

I have installed the latest version of pfsense. I have setup it up in bridge mode after creating a rule any for lan and wan respectively. I have setup the squid on transparent proxy mode with ssl ...
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KVM set gateway in isolated network

I have a really annoying issue. I am using KVM on CentOS 7 and two networks. One of the networks is isolated with internal host routing only The other network is forwarding using NAT. I have set ...
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1answer
40 views

How to set wlan0 active as default in /etc/network/interfaces?

OS:debian8.2 There are two network cards :eth0 and wlan0 . Here is my /etc/network/interfaces file. iface eth0 inet static address 192.168.1.100 netmask 255.255.255.0 gateway 192.168.1.1 auto ...
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1answer
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Why can't set eth0 to be my target?

Here is my /etc/network/interfaces file. auto eth0 iface eth0 inet static address 192.168.1.101 netmask 255.255.255.0 gateway 192.168.1.1 auto wlan0 iface wlan0 inet manual wpa-driver nl80211 ...
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89 views

capture FTP traffic for both active and passive FTP sessions

I understand that the command tcpdump can be used to capture traffic. How would I use that to record all the active and passive FTP traffic on my machine?
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2answers
72 views

How to configure raspberry to get a static IP without auto assigning a DHCP IP?

I have a raspberry PI in a network where all clients get a DHCP IP address assigned automatically. DHCP-IPs are "192.168.0.X" with subnet mask "255.255.255.0" But for my raspberry (and other devices) ...
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1answer
140 views

TP-LINK Archer T2UH wifi fastroaming on Linux slow or sometimes cannot connect on AP

we are running this on Linaro Ubuntu on ARM. We are using a TP-LINK Archer T2UH USB dongle attached to the ARM board connected to a 5Ghz-only network with 6 to 9 APs configured to share the same ...
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1answer
16 views

Why does a network adapter without any address still receive IP traffic?

Question A nix box with a network adapter in the UP state, but without any address, still receives IP network packet data. Why?
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1answer
36 views

Cannot obtain address via DHCP

I recently upgraded this box from Solaris 11.2 to Solaris 11.3. After that I cannot get an interface to obtain an IP address from within a non-global zone. From the global zone I have the following ...
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Quagga bgp advertisment stop after peer reboot

I am using quagga and FreeBSD boxes to achieve this: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13762-40.html#conf3. Only change is that upstream provider is sending full ...
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63 views

Can't enable net.ipv6.conf.eth0.autoconf

I can't get net.ipv6.conf.eth0.autoconf to = 1. Goes back to 0 after every reboot causing eth0 to never auto-acquire a global IPv6 address. I am running a headless Debian Jessie (kernel ...
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1answer
181 views

Unable to connect repositories in openSUSE leap?

Unable to add Community repository or refresh repository in openSUSE LEAP It isn't a problem with my network connection. Here's the output when I open yast>>online repositories>>refreshrepositories ...
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3answers
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how to get statistics of received packets on a specific udp port

my linux pc has a udp port listening, however, the application does not seem to receive any packets from this port. Is there any tool that I can use to show the number of packets received on this ...
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2answers
53 views

How do I verify the parameters set using tc command?

I am in need of simulating a high latency and low bandwidth connection for a performance test of my application. I have gone through a number of pages describing the tc command. But, I haven't been ...
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2answers
53 views

Capturing Traffic of Router

My machine is connected to a wireless router. Is it possible to analyse packets coming and going to the router? Can I use the bridged mode for achieving this? Actually I want the original packets ...
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1answer
76 views

Aircrack-ng: No /pentest/passwords/wordlists/darkc0de directories

this is my fist question on this forum. I'm currently using Linux Mint 17.2 Cinnamon and trying to run Aircrack-ng to show the password of my own Wi-Fi connection, I got the Handshake too. The problem ...
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systemd-networkd: Set VLAN device MAC based on host MAC

I am working on a platform with an ARM CPU running linux that has a single MAC in the CPU directly connected to a switch IC. I am trying to set up a VLAN mode using systemd-networkd which I have done ...
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0answers
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Problems when loading sites

Something strange is happening with my pc. Most of the sites just doesn’t open with no reason. Browser each times just throws Server not found. After few second it works fine, then again not found. ...
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1answer
23 views

Basic Hosting Postgresql in Virtualbox + Ubuntu 14.04

I have configured Postgres to accept network connections from anywhere: In pg_hga.conf: host all all 0.0.0.0/0 md5 In postgresql.conf: listen_addresses = ...
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Ubunto Network configuration seting and windows

When I set static ip in different place (means different networks) i have to replace static ip all the time for correponding nework in windows but in ubunto there are different configuration for ...
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2answers
219 views

Editing my /etc/hosts.deny

I'm being trolled by China, and don't know why I can't block their request to my server. //host.deny ALL: item.taobao.com ALL: 117.25.128.* But when I watch the error log on my webserver tail -f ...
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1answer
56 views

How to setup automatic IP assignment after ethernet cable is plugged in

I have a Centos server and I have a problem with automatic detection of cable connection. Whenever server is up before router has started i need to restart server to make it detect IP. For Example: - ...
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1answer
78 views

Which process/daemon replaces netplugd in Centos 7.1?

I'm moving a piece of software from Ubuntu 12.04 to Centos 7.1. Part of the original installation script runs dpkg -i netplug_1.2.9.1-2ubuntu1_amd64.deb. I can't install a ubuntu deb on Centos, nor ...
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testing open vswitch

I've been fooling around with open vswitch and trying to understand it. I have a simple setup that is not working as I expect it to. I feel like I'm probably missing something simple, but I don't know ...
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ip-tunnel: “Tunneling with a fixed ttl always makes pmtu discovery” - why?

The manual page for ip-tunnel says: ...fixed ttl is incompatible with [no PMTU discovery] option: tunneling with a fixed ttl always makes pmtu discovery. What is the reason for this? I do not see ...
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363 views

How do I DD over the network to an external HD?

I'm trying to clone a hard drive on my raspberry pi which is on the same network to an external harddrive of the computer I'm currently on. However I'm having issues piping the command correctly. I've ...
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1answer
30 views

Static IP settings not taking effect for hostonly network

I have a virtual machine with 3 NIC's. 2 are connected to a host only network. 1 is connected to the internet I statically assigned an IP address to one of the hostonly networks. When I run ip ...
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How to force dhcpcd to forget an old static address after editing dhcpcd.conf?

How can I force dhcpcd to forget a previously configured static address after setting a new one in /etc/dhcpcd.conf? I changed: static ip_address=192.168.1.1/24 to static ...
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1answer
118 views

Virtual Box guest on different subnet than host

I currently have my Debian VM using NAT and it is on subnet 10.0.2.x where my host is on 192.168.0.x how can I get my guest on the same subnet as my host? Host: Ethernet adapter VirtualBox ...
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5answers
400 views

rsync keeps disconnecting: broken pipe

I'm using rsync to backup my home directory. This has been working fine for a long time now. Here's the command I'm using: rsync \ -pavz \ --delete \ --exclude 'mnt/' \ --exclude ...
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1answer
55 views

Linux Forward Packets between interfaces

I would like to forward packets between interfaces without using iptables. I am not against iptables per se, I just believe that for my simple needs it's not necessary. However I am unable to do so. ...
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45 views

How to do data transfer speed test between two AIX LPARs

I have four LPARs connected via High speed inter-connect called Infiniband. It uses RDMA protocol for data transfer from one LPAR to another. I need a method to test the transfer speed. One solution ...
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38 views

Errors with bridged interfaces

I have problem with Debian running as a VirtualBox Guest. I can set up a bridge but it flood the logs with a lot of errors and system becomes unusable. Errors such as: Nov 12 16:30:55 jessie-gnome ...
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1answer
24 views

How can I improve performance using a system remotely via SSH?

I know I can use compression with the flag -C. Any other ideas? Also, besides my internet connection (which I think is fairly fast), what could be causing the network to slow down?
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mint 17.2 won't connect to strongest ssid, but instead to a specific one

In my network I have three access points with thesame name and passwords. But mint only connects to one specific one, and doesn't connect to the one with the strongest connection.
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Fedora 23 KVM and VLAN tagging

I have a server with a single physical NIC which runs the host as well as one KVM based Linux VM. I need to figure out how to configure the following on the host system: The host needs an interface ...
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1answer
118 views

Kerberos DNS issue with /etc/hosts

Thank you all for your time and attention. Very simply I'm getting this error when invoking kinit to test kerberos authentication against my AD domain (which is hosted on a Server 2012 box). The ...
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19 views

Tools for exploiting hole196

Are there any tools in linux which will allow us to craft packets with forged IEEE 802.11 headers?. I was interested in it as those tools can be used to exploit hole 196 vulnerability.
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24 views

Linux bridging question

I'm trying to understand why many Linux (virtual) networking guides attach IP addresses to a bridge device? A physical bridge itself doesn't really have an IP, instead one attaches networks to it and ...
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27 views

How can I simply access a packet's payload and modify it?

I am attempting to access a packet's payload and modify it with a word (let's say Bob). I have a simple tunnel VPN program written in C that displays packets in plain-text. When I connect to a host, ...
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2answers
44 views

list available network interfaces of a remote host (without SSH)?

Is it possible to find the available network interfaces of a remote host (eth0, etc..) without being able to SSH to the machine?
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138 views

Why can't Fedora start my (hard wired) network?

FYI: I've asked this on Superuser but not luck so I'm trying here. I'm not sure which it is more relevant to. I have a hard-wired Ethernet card/cable to my hub. I start Fedora 23 but there's no ...
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1answer
54 views

WiFi active and connection ok, but no eth0 or wlan0

I'm on Fedora, and trying to find my local IP address, so I ran ifconfig -a and got back the following: lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 ...
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1answer
151 views

How to get the name of a network interface that is down

I am using Ubuntu and am just curious as to tell the name of all network interfaces, even the ones I've taken down with sudo ifconfig wlan0 down (for example) as they no longer show up in ifconfig.
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1answer
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Cannot ping a tap device with ipv6 address

I'm running CentOS 7. First I created a tap device: ip tuntap add dev tap2 mode tap Then I assigned ipv6 address to it: ip -6 addr add dev tap2 fd00:4::1/64 ip link set tap2 up Its state ...
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FOG Server - Connecting Win XP (Virtualbox) to host OS for imaging

I have installed Elementary OS Freya 32 bit on my laptop to which I have installed and configured FOG. I've edited my WIFI network connection so that my internal IP is static (192.168.1.3) gateway is ...
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TCP/IP stack in the user context vs. kernel Linux

Assuming Linux, would it be possible to implement a TCP/IP stack in the user context (vs. kernel)? How would you do it? What would be pros and cons of such an implementation, as compared to the ...
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1answer
163 views

Why is init listening on port 80?

My Debian Sid installation has init listening :::80 and is prevent nginx from starting. root@server01:~# systemctl status nginx.service * nginx.service - A high performance web server and a reverse ...
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CentOS 7 eno1 DOWN at boot [duplicate]

I have to run isup eno1 at every boot to get the device online. Anyone know how to keep the interface up after a boot?