Managing and using network connectivity on a unix system

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Network Simulator ns-2: Modeling of fragmentation in the network with different MTU on routers

There is a simple network model. Transfer a file between hosts. There are several routers with different MTU. Here is the complete OTcL code: ...
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666 views

Packets not received by TUN device

I created a TUN device(nat64) and created a route so that all the required packets are forwarded to the TUN device from an eth device. But, I see that many packets are not received by the TUN device. ...
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2k views

RaspberryPi drops Wifi connection

I am using Airlink Fully compatible Wireless N 150 Ultra Mini-USB Adapter (AWLL5099) with my RaspPi to get internet. I am also bridging this WiFi connection with an Ethernet cable to provide internet ...
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126 views

Deny/allow a user's access to a port dynamically

I have stumbled upon this little tech dilemma yesterday, and know that there is a solution to it (IRC BNC resellers have it implemented already). However, the exact details and implementation elude ...
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424 views

Wlan0 Static Ip bridge

EDIT: Even taking br0 out, still cannot get a static IP connection. I had the following /etc/network/interfaces configuration and it was working auto lo iface lo inet loopback auto eth0 iface etho ...
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137 views

Making a Linux audio recording device available on a Windows 7 PC over network

I would like to use my headset's microphone both on my Linux laptop and a Windows 7 PC simultaneously, for different VoIP applications. I'm currently running Ubuntu with PulseAudio on the laptop to ...
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105 views

Cannot see an EC2 VPN server from another EC2 instance

I'm using openVPN to connect to one EC2 instance from another. The client cannot see the server, however, despite that servers outside of AWS can see the server and successfully negotiate with it. ...
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2answers
290 views

OpenVPN struggling

I've got some problems with my OpenVPN setup. The Setup: -> Ubuntu Server 12.04 -> Two active NIC's: eth0 (default): 192.168.1.0/24 eth1: x.x.x.x (external ip) I've managed to get the routing to ...
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1k views

Can't ping first IP with dual NICs on different subnets with multiple gateways

I have two NICs assigned to a server. eth0 - 10.199.10.0/24 w/ a GW of 10.199.10.1 eth1 - 10.199.20.0/24 w/ a GW of 10.199.20.1 From my desktop, I can ping the IP assigned to each NIC just fine ...
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379 views

Computer recognizes wireless network but asks for password repeatedly

I have installed Mint 14 Xfce on a Dell XPS 400. I am using a Belkin F5D8010 wireless card. I got the .inf file from the Belkin website and installed it using the graphical ndiswrapper tool. The ...
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2answers
298 views

full-featured WLAN USB adaptor

I am searching for a WLAN USB adaptor that can be used as an Access Point as well as a mere client and in an AdHoc setup. It should support IEEE 802.11n and transmit rather fast (300Mbps). As I ...
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716 views

Using Metasploit with 3G USB modem

I have a computer with Linux BackTrack 5 as host and Windows XP as guest on virtual box. I am using Host-Only-Adapter to create virtual LAN and to share USB modem internet as well so that both host ...
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337 views

How can I renew lease when it kept printing eth0 lease expired x seconds ago?

My guest VM cannot get an IP address from my host. It keeps printing: eth0: lease expired x seconds ago I've tried to start dhclient -r and dhclient and restart eth0 to no avail, see here for ...
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137 views

Unable to access internet if wireless enabled

The following is my route output. eth0 is my wired network and eth1 is my wireless network. Only wired one has access to internet. If I enable wireless, I am not able to access internet, it tries to ...
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638 views

Can't launch Snort on CentOS 6.3

I have a problem installing Snort on CentOS 6.3 in a virtual environment. When I run snort - ./snort status: Running in packet dump mode --== Initializing Snort ==-- Initializing Output ...
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483 views

Debian sheevaplug internet not working

I have a sheevaplug with debian 5.0..internet was always working fine until today. I have a bunch of pcs connected via wireless to my router and internet works fine. From today though my debian won't ...
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77 views

Creating and updating the packages for many Debian systems

I'm using a Lenny (Debian 5) for remotely controlled PC's (around 100 PC's) which will be pinging to my apache server. I'm developing a patch twice in a week to keep updated with the latest versions ...
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360 views

What problem have I caused to eth1 by resetting my ubuntu machine?

I am using ubuntu 10.04 (Bio-linux 6.0). Last night I tried leaving my system in hibernate mode because there appears to be a bug in this version of ubuntu such that if I do a straight shut-down, the ...
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345 views

openBSD static ip can't connect

I have set /etc/hostname.msk0 to inet 192.168.1.102 255.255.255.0 NONE and /etc/mygate to 192.168.1.1 but still can't ping the router (192.168.1.1) do I need to configure dns to ping ? ...
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481 views

Add blinking network-monitor icon to GNOME / XFCE

I'd like to see if I have incoming or outgoing network traffic via a little blinking network-monitor icon in my system tray, similar to the network system tray icon in Windows XP and Android. I would ...
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2k views

G3 Usb Modem Huawei E1550 did not work after unplug (NetworkManager)

I have the following problem: When I boot with plugged in usb modem everything is fine. If I unplug modem and plug it back it can not be used any more. Some logs below. 1. Modem plugged on boot ...
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309 views

Information about the 1630/master app

When I run $ sudo netstat -a --programs | grep LISTENING | grep 1630 I will get this output. Do you know what good are processes running under this app name? Why they I running on my system and if ...
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1answer
1k views

installed teamspeak 3 on freebsd using portinstall but can't connect [closed]

I installed teamspeak 3 on freebsd 7 using portinstall. When i do service teamspeak status i see teamspeak is running but somehow I cannot connect to the server. did I miss something? I followed ...
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1answer
532 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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342 views

Configuring multiple static IP addresses for a disk image

Using Ubuntu 10.04 I'm using Clonezilla to create and install a customized image. I'd like to be able to set up multiple static IP addresses. For example, I'd like the first interface to have the IP ...
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362 views

Usb tethering with linux and htc desire s other than rndis_host

I want to share the connection of my htc desire s with linux and I'm doing it but if it is possibile I'd like to avoid using the rndis_host module. The tethering can be configured as "windows" or "mac ...
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568 views

AIX multihomed multicast

On my AIX machine if I run netstat -ia I get: Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll en0 1500 link#2 1e.18.1.1e.78.2 385229 0 1091655 0 0 ...
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1answer
348 views

Sharing Mobile Internet To Others

Currently I am using a mobile internet connection using an USB cable. How do I share this connection with my peer who only has a wireless card on his macbook? So far what I have tried: Internet ...
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362 views

Juniper SRX210, how to make DHCP to Static IP?

I am very new to Juniper device. I have a SRX210 router, and i am testing how to setup Static IP. So i did: set interfaces ge-0/0/0 unit 0 description ISP Link set interfaces ge-0/0/0 unit 0 family ...
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198 views

configuration for my wireless connection

I had connection issues so I changed some wireless configuration. I think I solved the problem, but I still have minor issues. First thing I had my Internet connection freeze badly, Then after doing ...
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1answer
651 views

rpc.statd and avahi-daemon listening on all networks?

Background: - I'm running a home Debian GNOME desktop connected to the internet through an ethernet cable to an ethernet router. - I have a printer connected directly to my PC with a USB cable. - My ...
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1answer
697 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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1answer
29 views

Is it possible to have 2 different passwords saved for the same network?

I'm not always at home and sometimes the router needs to be reset completely to receive a new wan ip address because my roommates are not very tech savvy at all. When this happens the password is ...
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1answer
599 views

Centos VM network configuration problems [closed]

Hi I am new to this stuff and confused. I have a CentOS VM and I cannot get it to see the outside world. I have a bridged adapter. I have tried NAT and a host only network. /etc/sysconfig/network: ...
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3answers
115 views

Which program is altering my resolv.conf?

On Debian 8 stable, I add dns server IPs in /etc/resolv.conf but after some time they get overwritten. I don't have gnome installed (I use i3wm) and network-manager is not installed either. On ...
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429 views

How to limit all tcp traffic to the network interface the session was initiated on?

I have an embedded linux system with two network interfaces (lan0, wlan0) that are configured to the same subnet. A server on this system accepts tcp connections on both interfaces. How I can assure ...
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2answers
158 views

Keep losing resolv.conf configurations

Every time i reboot raspi this resolv.conf files is cleaned. i normally add on this file the openDNS ips like below: # OpenDNS IPv4 nameservers nameserver 208.67.222.222 nameserver 208.67.220.220 I ...
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84 views

Why does kill not have a parameter for file and not for port number?

If I want to stop a program given its tcp port number or its file or named executable, can I run something like kill -tcpPortNumber $1 where the parameter $1 is a tcp port number or kill -filename $1 ...
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3answers
5k views

Telnet on Linux Server

I want to know if it is necessary to have telnet enabled on both sides of machines to get telnet connection. Here's the issue: I am trying to telnet some public IP on port 80 from a Linux web server ...
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348 views

ping not working for google alone

one of my friend changed some network config in my laptop at home, He said he tried something related to block a website(he tested it with www.google.com).Now www.google.com not loading . Even he dont ...
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111 views

What does this host means ' ::1 '

To secure my mysql server, I checked the list of users : mysql> SELECT User,Host,Password FROM mysql.user; +------------------+-----------+-------------------------------------------+ | User ...
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3answers
21k views

Method to check connectivity to other server

I want to check connectivity between 2 servers (i.e. if ssh will succeed). The main idea is to check the shortest way between server-a and server-b using a list of middle servers (for example if I'm ...
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4answers
282 views

Find a server IP on LAN from a script

I am looking for a way to have a script on a client machine automatically find the servers IP on the same network. I have several media extender clients running ubuntu 14.04.1 and a server running ...
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2answers
202 views

Arch linux get network interfaces names

I need to get all intefaces names in Arch linux. If I issue command ifconfig, I get following response: [root@pi ~]# ifconfig eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 ...
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1k views

Best way to find out what Linux Version is used on a Webserver

Is this feasible? Can I find out which distro is used to host specific webpages? Whois doesn't have info for this.
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3k views

How to set domain name in Crunchbang GNU/Linux?

How can I set the domain name in GNU/Linux?, I am using Crunchbang and I need to set the domain name for my LAN network. EDIT: Let me talk more about my problem: I need to configure a LAN network for ...
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2answers
887 views

Linksys wusb600n support on Debian-6

I'm on my way from Windows 7 to Debian 6. The only problem... I'm not sure about my network adapter. Its Linksys wusb600n and without it - no internet access for me. Does Debian 6 support it? Will ...
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2answers
3k views

What could cause network latency on a fresh Ubuntu Server 10.10 install?

I have recently purchased a machine to run an online game server. I put the machine together and have installed a fresh copy of Ubuntu Server 10.10. I have noticed that the game server produces a ...
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1k views

Please recommend a GUI telnet client

I'm looking for a simple GUI telnet client. I only ever used the CLI one, simply named telnet.
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272 views

-bash: auto: command not found

I'm going to config my network interfaces and run this command: auto eth0 but it returns -bash: auto: command not found. It seems I've missed something which I don't know. Any idea? What should I ...