Managing and using network connectivity on a unix system

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isc-dhcp-relay service doesn't work

192.168.2.1(dhcp server) -> (eth1 192.168.2.3)[ubuntu 14.04 dhcp relay server](eth0 192.168.1.1) -> Client isc-dhcp-relay successful installed, configuration file is #/etc/default/isc-dhcp-relay ...
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3 views

Multiple iptables denied in report from hourly logcheck on Debian

I get thousands of lines of iptables denied every hour from logcheck, for a week now. What are the steps to troubleshoot this, what are the main causes of this? This is inside an LAN and the ...
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1answer
628 views

unable to restart networking daemon

When I type sudo service networking restart, I am getting error as shown below: edward@computer:~$ sudo service networking restart stop: Job failed while stopping start: Job is already running: ...
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0answers
11 views

network.service - after executing “telinit” network interfaces doesn't start

When I start RHEL 7 everything is fine, my network functions, I can ping other PC's etc: [root@localhost]# service network status Configured devices: lo eno1 enp2s0f0Team enp2s0f1Team team0 team0.300 ...
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3answers
39 views

What is the preferred way of using low port numbers in linux?

Long story short: I want Glassfish to listen to port 80 so that you don't have to specify port when typing in the url, but linux doesn't permit using low port numbers without root and running ...
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1answer
24 views

How do daemons like apache or bind open ports below 1024?

I know that ports below 1024 are protected and can't be opened by a user without sufficient permission. However, I'm wondering how daemons such as bind or apache can do so, though they aren't running ...
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0answers
18 views

Specifically what advantages does Kali Linux have other than preinstalled packages? [on hold]

I have been using Kali Linux increasingly over the last few months. I also have an Ubuntu system, and have found that there are many similar tutorials on how to install Kali tools on Ubuntu. However, ...
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1answer
609 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
30 views

monitor mode capturing wifi

I have a network, which has 2 nodes (a phone, a MacBook) both are connected to same wireless network, I know the SSID and password for the wireless network password: mypassword ssid: myssid security: ...
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3answers
788 views

waiting for network in a bash script

I'm running a script that relies on network being up and a network share be mounted. The script runs on login (which happens automatically after boot). The problem is that by the time the script runs, ...
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0answers
11 views

Routing ALL traffic through VPS

I recently acquired a Raspberry Pi and I'm setting it up for various things. I have a local router that the Pi is wired into along with my desktop computer. I want to be able to access the Pi from ...
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0answers
25 views

VirtualBox Bridged Networking is not working (NAT and Host-Only works)

I'll try to be brief and include all the things I've tried out so far: Guest OS: Debian Wheezy Host OS: Windows 7 Setting networking to NAT works. Setting networking to host-only works as well. ...
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13 views

packet transmission across two virtual machines in different subnet [on hold]

I am working on networking project. Here is the scenario, I have deployed two virtual machines on kvm in CentOS. These two virtual machines are in different subnet. I want to make communication ...
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1answer
16 views

How to change configuration of eth0 without restarting other interface (CentOS, Redhat)

I need to setup a static IP for eth0, my server has multiple network interfaces and I don't want to bring any of them, except for eth0 down. I found lot of guides like ...
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3answers
76 views

Is it bad to select remember me option in the browsers of a compromised machine?

I was reading an article on how to sniff network packets. (of course for knowledge purposes only). I came across these particular lines. For instance, say I was sniffing traffic on the network, ...
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1answer
26 views

How does Linux prevent applications from sending more packets than the link can handle without dropping packets?

I couldn't make the question any clearer so here's an example scenario: Given a Linux machine connected to an IP network through a physical interface of bandwidth 10Mbps (or a higher speed interface ...
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1answer
49 views

forward packets from one interface to another interface using iptables

I have an embeded system with 2 interfaces e0 and m0, whose ips are 10.0.0.20 and 192.168.0.20, respectively. Incoming packets into e0 have an ip of 10.0.0.10 and should be forwarded to m0 interface ...
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4answers
2k views

Simple way to create a tunnel from one local port to another?

I have a development server, which is only accessible from 127.0.0.1:8000, not 192.168.1.x:8000. As a quick hack, is there a way to set up something to listen on another port (say, 8001) so that from ...
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31 views

Why must a server know its own host-name and domain-name?

In Linux, a server can set its own host-name and domain-name through sethostname() and setdomainname(). I just wonder, however, why must a server know its own host-name and domain-name? To my ...
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0answers
14 views

Network tool to monitor IP packet fragmentation

Is there a tool, similar to iptraf, that would let me see how many incoming/outgoing IP packets get fragmented/defragmented, and what percent of traffic they are? I know this can be counted with the ...
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0answers
17 views

Unable To Bridge Two Teamed Interfaces - Advice?

Before the wall of code I'll explain the situation. I'm trying to set up two interfaces to be teamed together, and from that team create a bridge. I've been studying for the RHCE and I believe this ...
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0answers
26 views

IP packets fragment randomly

I've observed the strangest thing - the same packet, same size, send through the same interface sometimes gets send whole, and sometimes gets fragmented, as if it exceeded the interface MTU... 1472 ...
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1answer
44 views

Which ip alias is currently active? [on hold]

I used IP aliasing technique to assign multiple IP addresses on a single NIC. I am using these IPs in a Python script to generate traffic. I am doing this for my college project. How can I determine, ...
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1answer
32k views

How to connect to Internet in Kali Linux after changing IP address manually?

I have a problem in my Kali Linux. I cannot connect to the Internet after changing my IP address using this command: ifconfig eth0 198.168.198.130 netmask 255.255.255.0 up After this, when I open ...
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5answers
36k views

What DNS servers am I using?

How can I check which DNS server am I using (in Linux)? I am using network manager and a wired connection to my university's LAN. (I am trying to find out why my domain doesn't get resolved)
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2answers
4k views

D-Link DWM-156 HSPA USB Modem doesn't work with SIM card inserted

I have a D-Link DWM-156 HSPA modem, that I bought just a few days ago. The modem has drivers in its internal storage. There are Debian packages (.deb) for both i386 and amd64, so obviously I installed ...
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1answer
452 views

Mumble doesn't bind to network address on boot, needs to be restarted (doesn't properly wait for network?)

I have a default, unchanged installation of the Mumble server on Debian Squeeze (package "mumble-server"). On a previous setup, starting the server (called murmurd) on boot using the default init ...
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1answer
2k 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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1answer
3k views

Airdrop compatible

Is there anything in Linux that implements whatever it is that makes Airdrop in OS X work? I'm not really familiar with that program, so I'm not sure what protocol it's using to communicate. update ...
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1answer
6 views

Virtual eth-adapter in networking-configuration

I have on my Debian en eth0-interface and I need the interface to listen to other IP's. I know I can create it with the following command ifconfig eth0:1 10.10.10.20/24 With this command everything ...
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1answer
22 views

Is Super server (inted / xinetd/… ) comes with Ubuntu default?

Few days back I learn about super server in networking. Then I looked for /etc/inetd.conf and /etc/xinetd.d and found neither of them in Ubuntu. Note: I know only these two types of super server ...
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1answer
32 views

Assigning static public IPs to Proxmox KVM guests

I'm currently using 5 public IPV4 addresses on a physical machine running Ubuntu Server, which I intend to replace with new hardware running Proxmox. I'll do a P2V of the current Ubuntu install into ...
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2answers
659 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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1answer
3k 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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2answers
421 views

Static IP addressing issue in Ubuntu on BeagleBoneBlack Rev C

I have my BBB configured to use a static IP address using the following in the file /etc/network/interfaces: allow-hotplug eth0 iface eth0 inet static address 192.168.0.1 netmask ...
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1answer
77 views

Weird authentication with Exchange server

I'm using Evolution with evolution-mapi to access an Exchange e-mail server. It has worked flawlessly in the past, but recently it will fail to authenticate, asking my password endlessly. If I enter ...
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2answers
1k views

Suggestions needed for udev, udisks, autofs, notification setup for a complete automounting solution on Linux

Continuing on Automounting plugged devices in linux, which left things a bit basic. Running Gentoo, I'm automounting a combination of local and network devices on my laptop with autofs-5.0.4-r5. Doing ...
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1answer
610 views

Network fail on FreeBSD: Ping to router fails, but router believes computer is connected

I have a TP-Link TL-WN851N wireless adapter, which is based on an Atheros device. When I attempt to connect to my WPA2 wireless network, ifconfig wlan0 tells me that the connection is 'associated'. My ...
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2answers
6k views

How to set up an Internet Connection in Linux Mint?

My machine has wired Internet connection with Windows 7 OS. In connection properties I see service name : ispone obtain IP address automatically obtain DNS server address automatically How do I ...
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1answer
26 views

SIPp “hello world” message to Asterisk

How do I run diagnostics against Asterisk? Asterisk is running on tleilax; and doge is on the same network (My network topology isn't optimal). Specifically, I want to do something like: sipp ...
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1answer
37 views

yast routing problem — connect: Network is unreachable

---------------------------------------------------update----------------------- on doge the route works: thufir@doge:~$ thufir@doge:~$ route Kernel IP routing table Destination Gateway ...
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1answer
89 views

Dump network traffic of single application (strace-like)

I'm looking for a way to dump pcap of network data generated by an application, in a simmilar way strace dumps syscalls, etc. eg: net-strace somecommand -args somecommand would do something over ...
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1answer
2k views

Linux Mint 17, Wifi Slow and Drops Connection, No Ethernet Connection

On a fresh install and updated Linux Mint 17 XFCE, the system cannot maintain an internet connection through wifi, and is unable to connect at all through ethernet. Wifi will work somewhat slowly for ...
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4answers
17k views

Yum update problems on CentOS 6.5 minimal as VMware guest

INFO: I am using Windows 7 Pro (64bit) with VMware Workstation version 10.0.1 . I am using CentOS(64bit) 6.5 minimal, for the first time. I am running this from my workplace network, which may use a ...
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1answer
23 views

Historical bandwidth data in a console? (save/load statistics)

So, I found that nload and iftop displays the amount of data that passed and how fast. Now, is there anything like those that can save/load statistics? I want to measure the amount of data I download ...
2
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1answer
1k views

Static IP address shifting to 192.168.1.251

I have a system with a static IP address of 192.168.1.150. I configured /etc/network/interfaces manually (i.e. without using NetworkManager.) It is a web server hosting three sites. I am having ...
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1answer
545 views

How to monitor network performance for each application in FreeBSD / PC-BSD?

I'm using a PC-BSD workstation, and I would like to know if there is a way to monitor which app / process is using the network. I use a Mac OS X (Mavericks) laptop, and the "Network" tab in the ...
2
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1answer
23 views

asterisk network topology — KISS

is this the typical Asterisk topology??? On my home system, I have the Asterisk server, tleilax, and the client, doge, connecting into my router -- so that they're both on the same network. The IP ...
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21 views

converting teaming to bonding

RHEL 7 contains bond2team tool but it doesn't contains opposite team2bond tool. I need to convert my teaming files to bonding (please don't ask why, this is for testing purposes). This is my teaming ...
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2answers
948 views

NAT and source IP filtering in PF, using OpenBSD >= 4.7

I just read a book about PF (The Book Of PF, No Starch), but there's one question not answered by it. If I have a gateway machine using two interfaces, $int_if and $ext_if, and I NAT the packages ...