Managing and using network connectivity on a unix system

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check the current backlog queue size

The sysctl netdev_max_backlog sets a limit to the maximum number of packets allowed in the kernel's backlog queue. Is there a way to check the current queue size (i.e., how many packets are currently ...
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5 views

How to install airtel 3g dongle in redhat linux 5?

I have an Airtel 3g dongle, that I am not able to install in RedHat 5 Linux. I am getting the error : chmod +x install_linux "read only file system"
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1answer
35 views

Network: how they obtain 127 subnets? [closed]

I read on a book about networks that class A has 16777214 hosts and 127 subnets,my question is: how they obtain the 127 number?
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1answer
15 views

Two networking interfaces trying to get an IP via DHCP

When using: /etc/network/interfaces auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp auto wlan0 allow-hotplug wlan0 iface wlan0 inet dhcp wpa-ssid "<myssid>" wpa-psk ...
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1answer
29 views

Boot blocked during 1min30sec because /etc/network/interfaces

With the following config (see config file below): if only ethernet cable is connected, it 100% works: I can quickly SSH the computer via eth0's IP, if both ethernet cable and wifi dongle are ...
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1answer
61 views

DHCP and read-only root filesystem

When doing ifup wlan0 on a system with / mounted as read-only (embedded computer), I get this error: Failed to connect to non-global ctrl_ifname: wlan0 error: Read-only file system Internet Systems ...
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23 views

Trouble switching between wired/wireless networks with Fedora 21

I have a Gb/s wired network and a much slower wireless on my home LAN. I switch between them in the course of my day. I have always found that Linux is not particularly clever about using the wired ...
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10 views

Share Oracle Database Connection from one system to another in same network

I have installed Oracle 11g XE in one machine, which has cent os 6.5 installed in it. Now i want to connect to this machine's oracle database from an another machine. Both are connected to the same ...
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19 views

Ethernet USB dongle works then randomly drops until restart

I've been using xubuntu 14.04 as my daily driver for a while now, as I've been getting into web development. I'm using a dell ultrabook that has no ethernet port (XPS 12 9Q33), and so I have usb 2.0 ...
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1answer
64 views

Gentoo: how do I get an IP assigned to the network interface?

I'm noob. I'm trying to install Gentoo from the LiveCD (just for fun as well as for getting better understanding what's going on under the Linux's hood) on my notebook. I've faced an issue which is ...
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15 views

Wicd cannot detect wireless networks on Point Linux OS

I have just installed Point Linux OS on my PC. The problem is: it cannot detect wireless networks, but it is okay with wired network. Please help me.
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20 views

Converting a raw print data stream containing PCL commands to PDF

I have a program that sends raw print data through samba to typically PCL compatible printers. The program is written so basic PCL commands control how it prints. When sending it to the printer it ...
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106 views

Is it possible to throttle upload bandwidth per `IP` basis using `tc`, `htb` and `iptables` ? (Download limitation not required)

Problem I've searched internet like anything but couldn't find much about limiting upload. The solutions given are not limiting IP basis like this one but LAN as a whole. +-----+ ...
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1answer
14 views

Need to write an automated web navigator with “click” and “retrieve” capabilities

In our company, several clients provide the detailed information information that we need in a web site. The amount of time that our employees spend navigating the remote website is simply ridiculous, ...
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0answers
27 views

Required new 'X' desktop for VNC?

I'm on Raspberry pi 2, running Raspian, and using Ubuntu 14.04. I am using the tightvncserver. I don't think I should have to start a new 'X' desktop each time I want to VNC into the pi, but whenever ...
2
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1answer
37 views

IP address alias? E.g. map 203.0.113.37 to 127.0.0.1?

I want to use an SSH tunnel to work on a project, -L 8080:localhost:80. When opening http://localhost:8080 on my local machine things work, but the server (MediaWiki) is putting a lot of ...
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1answer
38 views

Finding out the number of dropped packets in raw sockets

I am developing a program that sniffs network packets using a raw socket (AF_PACKET, SOCK_RAW) and processes them in some way. I am not sure whether my program runs fast enough and succeeds to ...
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74 views

Ubuntu 15.04 wired connection keeps dropping and restarting

I've finally switched to Linux (Ubuntu 15.04) 2 weeks ago and everything went well. But unfortunately after turning on my PC today and doing the usual (sudo apt-get update, sudo apt-get dist-upgrade) ...
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23 views

VPN: Script at /etc/ppp/ip-up.d/ not autoexecuting on PPTP connection established

My PPTP client is Ubuntu Desktop 14.04.2LTS. My PPTP Server is a Buffalo DD-WRT Firmware. If I establish my PPTP VPN connection (named Themiscyra): luis@PortatilHP:~$ sudo pon Themiscyra ...
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1answer
38 views

How do I install a network printer without being dependent on the IP-address of the printer?

In Linux I want to install a HP LaserJet 1320n that needs to be power up and down. It will get a new IP-address every time it's powercycled. How can I install the printer on a Linux machine and not be ...
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40 views

VirtualBox network interface with custom CIDR and internet access

I have an OpenStack setup running on VirtualBox. The host OS is Ubuntu, and the guest OSes are all Ubuntu. I use 3 VirtualBox VMs to setup and install OpenStack. My OpenStack setup further spawns ...
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1answer
11 views

Setting up QEMU and MIPSEL : networking trouble

I have a MIPSEL machine running on QEMU. In order to enable networking inside my qemu MIPSEL machine, I use a bridge virbr0. First, I create the interface tap0 and bring it up. I do it as follows :- ...
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20 views

Route dies on Ubuntu 14.04.2

So I have this routing setup in EC2 on a Ubuntu machine: 10.50.0.0/24 dev eth0 proto kernel scope link src 10.50.0.163 x.x.x.x via 10.50.0.80 dev eth0 proto static y.y.y.y via 10.50.0.80 dev ...
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40 views

Getting error in nslookup

I am trying to do nslookup skhdphost1 but I am getting below error. When I try to Reverse lookup checking using command nslookup 172.16.xxx.xx again getting the same error: The error message is: ...
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2answers
79 views

How to share one internet connection from LAN to another LAN?

I have a Raspberry Pi connected to a router (Router1) with internet connection in en0, with IP 192.168.1.110, however I have my RPi's wifi port (wlan0) connected to another router (Router2) with IP ...
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42 views

How to find out the wifi sensitivity (RSSI)

I want to be able to get the received signal strength indication from my computer's wifi interface, ideally as expressed in dBm. This article explains what I am after.
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28 views

Cannot connect to public IP address of server used as VPN gateway?

When I try connect to the public IP address of server that is also used as an openvpn gateway from a Windows computer within the network it fails to connect, but if I connecto the VPN ip address it ...
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1answer
36 views

Block outgoing connections to certain IP using PF

Can someone give me a hint on how to setup a basic deny rule whenever any TCP request is sent to a specific IP address? I am using the PF packet filter. Any help?
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22 views

FreeBSD: Control operational and administrative status of virtual interface

I'm looking for a way to freely control the administrative and operational status of a virtual interface as seen by a snmp get requests: $ snmptable -c public -v 2c myserver iftable SNMP table: ...
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41 views

Having problems when connecting pppoe in my Kali Linux

Here is my log: Jun 6 04:57:23 unknown pppd[3333]: pppd 2.4.5 started by root, uid 0 Jun 6 04:57:36 unknown dbus[2534]: [system] Failed to activate service 'org.freedesktop.Avahi': timed out Jun 6 ...
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1answer
49 views

wlan0 device missing

I can't seem to get my wifi working and I feel i've exhausted google's search capabilities. Here is the output of lspci for the device 02:00.0 Network controller [0280]: Broadcom Corporation ...
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1answer
47 views

SSH from different countries with openvpn configured on pfsense and dd-wrt?

I have vpn set up in two different countries A (primary, where I live) and B (secondary, which I visit once or twice a year) and would like to SSH to my devices across the vpn. My Setup: Country ...
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46 views

IP packet forwarding in Debian

I have a physical network set up with machines A←–→B←–→C.  IP and Ethernet configurations are summarized as following: A(eth0: 10.10.10.2) ←—→ (eth0: 10.10.10.3)B(eth1: 192.168.0.3) ←—→ (eth1: ...
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1answer
51 views

How to block telnet using iptables command

I am trying to block telnet on my server but I have failed to do so. I have added following firewall rules in INPUT chain of filter table for the same. INPUT CHAIN(filter table): <some other ...
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20 views

Metasploit target reverse connection

well, I found many tutorials on how to open a meterpreter session on devices. But this devices must be on the same network of the computer from I launch the attack (because the lhost often looks like ...
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63 views

Binding nonlocal address on NetBSD

This is not a programming question, but a question about NetBSD. Linux, FreeBSD and OpenBSD have mutually exclusive but similar interfaces to allow binding the local end of a connection to an address ...
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22 views

Can I inherit iptable rules on/under windows? [migrated]

Don't really want to purchase a VPS just to test some iptables stuff for my gameserver. Was curious if it's possible to load up debian on vmware player and install nginx, nodejs, mysql, etc (which is ...
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1answer
47 views

routing table “220” in Linux kernel 3.2.0-23-generic

I have a Linux machine with kernel 3.2.0-23-generic and it has rule with priority 220 in RPDB which points to routing table named "220": T42:~# ip rule show 0: from all lookup local 220: ...
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1answer
53 views

routing cache in latest Linux kernels

As I understand, routing cache was removed since Linux kernel 3.6. In systems with older Linux kernel one could view the content of the routing cache with ip route show cache command and routing ...
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2answers
36 views

Bind doesn't resolve his authoritative zones

I'm currently setting a Bind 9 server on a CentOS 7 system, but I have some kind of unexpected behavior (even though it worked great in my VM). When I want to retrieve records from the zones it is ...
2
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0answers
128 views

Force IPv4 over IPv6 only for certain addresses

I'm currently running Debian 8 and I'm trying to force applications like Google Chrome to use IPv4 over IPv6 only for certain sites. My ISP natively offers IPv6 and it's amazing on all websites that ...
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2answers
55 views

What is stopping our UDP packets (how does it know the route is down)?

We have a server (camera) sending RTSP video packets via UDP. At a customer site it travels over several hops, one of which may be an unreliable WiFi link that drops the odd packet or five. Usually ...
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22 views

Network problem in Kali via bridge on VM

It's as simple as the title. I've installed Kali Linux and can't get ipv4 using bridge network on VM. Already tried all the popular solutions like changing NetworkManager.conf and restarting it. ...
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2answers
56 views

iptables configuration - ssh connection only from a remote network

I'm trying to configure Iptables of a server in order to permit SSH incoming connections only from a certain network. by the way this is the rule chain : # Drop anything we aren't explicitly ...
0
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1answer
44 views

Lab environment for testing routing in a Unix environment?

I know there are tools such as GNS3 and Packet Tracker; but the big problem with these tools is they do not work with open source tools such as OpenBGPD and BIRD. So, this leads me to the question; ...
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37 views

Modification needs to be done in iptables in case of a bridge between two interfaces is implemented

I have a machine with 2 NICs; eth0 and eth1. Each NIC has an assigned IP address and the traffic between them is controlled using the below script. #!/bin/bash SAT_RECV="192.168.200.0/16" NQ=9 ...
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36 views

Manual creation of NetworkManager connection file fails (Error: Unknown connection)

Objective: I am trying to set up a 3G connection using NetworkManager 0.9.4 via command line. I have previously succeeded (see this question) by setting up the connection through the nm-applet (GUI in ...
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1answer
65 views

Force a service to start before networking.service

I would like to start my service samplerbox.service [Unit] Description=Starts SamplerBox [Service] Type=simple ExecStart=/root/SamplerBox/samplerbox.sh # this script does: python ...
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0answers
53 views

nmcli connection activation failed

I was able to create a wifi hotspot on my debian 8 install using network tab under gnome settings. I was trying to do the same using nmcli but it always shows $nmcli con up id Hotspot Error: ...
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1answer
60 views

No IP address on VMware running centos 7

I just now installed Cent OS 7 on my VMware 8 and I am not able to connect it to a network. I checked the VM network and its mapped to the physical NIC. The same setting work like charm on my CentOS ...