Managing and using network connectivity on a unix system

learn more… | top users | synonyms (1)

13
votes
3answers
26k views

How to configure external IP addresses for LXC guests?

I'm exploring the LXC features in Ubuntu 12.04 and I really want to set up a network like this: client1: 192.168.56.101/24 lxc-host: 192.168.56.102/24 guest1 192.168.56.201/24 guest2 ...
10
votes
2answers
379 views

Linux program to look into what you're downloading

Is there a linux program that allows you to look into your current download traffic? Something that can list all the addresses I am currently connected to and downloading from.
24
votes
3answers
35k views

Linux network troubleshooting and debugging

From time to time Linux and Unix users faced with various network problems. Many of these problems are presented here and at some others troubleshooting forums, but the are very concrete and contains ...
5
votes
2answers
7k views

Monitor mode wifi only seeing broadcast packets

I have pretty much exhausted every link I have found on google regarding this topic, and I'd like some of the most experienced eyes on the problem, because something obscure must be going on. Systems ...
1
vote
1answer
758 views

Reducing ubuntu boot time using dmesg

The boot time is 141 seconds. Here's the most interesting parts of dmesg command: [ 2.870498] usb 1-1.2: new high-speed USB device number 5 using ehci_hcd [ 80.669210] ADDRCONF(NETDEV_UP): eth0: ...
0
votes
3answers
4k views

How to setup wine for networking in linux

How to setup wine for networking? Unless i have linux access to my windows network, i can't do wine discover the windows network. How to do it?, also wine hasnt cmd line utility so i can't use ...
2
votes
1answer
3k views

How to Connect to Wireless Automatically? (Non-graphical)

I'm trying to set up my Arch Linux so that, through non-graphical means, I can connect to a wireless network through profiles on my system. I have tried net-auto-wireless, and it does everything I ...
2
votes
1answer
1k views

RHEL how to sync network settings between GUI and configuration files in /etc/sysconfig/network-scripts/?

In RHEL, we can change network settings either using GUI or editing the configuration files in /etc/sysconfig/network-scripts/. I would like to know how the network settings (e.g. IP address, ...
15
votes
4answers
2k views

TCP dies on a Linux laptop

Once in several days I have the following problem. My laptop (Debian testing) suddenly becomes unable to work with TCP connections to the internet. The following things continue working fine: UDP ...
2
votes
2answers
133 views

Cannot Restore LAN Connection

I have two servers, 198.162.0.4 and 198.162.0.10, that were connected across a LAN. They are the components of a DMZ where 198.162.0.4 is the wen server and 198.162.0.10 the application server. ...
2
votes
2answers
1k views

Quickly check whether many network hosts are up-and-running

Objective: check if a host is up-and-running on the network, with a method that can be efficiently parallelized over many hosts. Emphasis on a QUICK turnaround of the check. Reason to emphasise ...
1
vote
0answers
737 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 ...
5
votes
2answers
379 views

How to schedule a job that depends on network availability?

I have cloned a git repository of some project. I want to automate git pull and compile the project once in a week. I am using a laptop which wont be on 24x7. Now, I cannot use cron as I should keep ...
1
vote
1answer
2k views

How do I safely unmount a network share on Linux STB without crashing (I get GSOD)?

I have a network share named dreambox on C:\dreambox that is shared with the group Everyone in Windows. I have mounted it to /hdd on a Linux-based STB with OpenDreambox (OpenEmbedded) using Telnet ...
2
votes
0answers
1k views

Can't ping gateway after bridge

I am running CentOS 6.3 with NetworkManager disabled. I was trying to set up a network bridge to try out setting up guests w/ kvm. I was creating a bridge before setting up stuff with kvm, just since ...
2
votes
1answer
700 views

What does “kernel-resident” mean?

Quoting from the ifconfig man page: ifconfig is used to configure the kernel-resident network interfaces. It is used at boot time to set up interfaces as necessary. After that, it is ...
6
votes
1answer
509 views

Why the difference between network addresses reported by hostname and ping?

I have tried hostname and ping in a cluster machine, with different outputs. I am wondering what is the difference between the two? For example, on the same machine, hostname outputs node4.XXX and ...
3
votes
1answer
899 views

Network interfaces for Jails

I have been reading over the creation of Jails on FreeBSD, and one stumbling block I have is regarding network interfaces. Say my local router is 10.0.2.1, and the BSD box is 10.0.2.5. I would like ...
1
vote
2answers
4k views

Easily connecting to the internet with FreeBSD

I am a beginner at using UNIX, and I have a small Toshiba notebook computer which I installed FreeBSD 9.x on. I looked at the online handbook to try to find out how to connect to the internet, but ...
1
vote
2answers
4k views

Cannot get Realtek r8168 ethernet card up

I've working on Arch Linux and in 99% of time I connect to internet by WLAN but sometimes I need to use ethernet connection, so today I see something strange. My eth0 device is down, and I can't get ...
0
votes
1answer
210 views

How to use linux tools to verify a site's authenticity

When I go to certain websites where it's important for me to know that I'm connected securely, certain browsers will say that the site failed the authenticity check. Firefox won't say anything, but ...
4
votes
1answer
124 views

Play sound when connecting to network

I thought it would be fun to play a sound when connecting to a network of some sort (wireless or otherwise), kind of like the dial-up sounds of yesteryear. EDIT: Clarification: when connecting to the ...
5
votes
4answers
35k views

How to put Mac OS X wireless adapter in monitor mode

I'm searching for a equivalent of "iwconfig eth0 mode Monitor" in Mac OS. From man iwconfig mode Monitor does the following: "the node is not associated with any cell and passively monitor all ...
4
votes
2answers
2k views

Does Linux have support for network interfaces over an AT-Command serial modem?

I've got a Telit GM862-GPS module, which is a GPRS modem with a serial interface and uses the standard Hayes AT command set (with some extensions). What I'd like to do is to be able to connect this up ...
5
votes
2answers
5k views

Connect to hidden Wifi AP with wpa-supplicant?

I have a headless Debian machine, with a Wifi dongle connected. I used to hide the Wifi AP, but now I can't. If I unhide it, some lines in the /etc/network/interfaces will allow me to connect: auto ...
11
votes
2answers
20k views

Fast way to copy a large file on a LAN

I am having some trouble with NFS, and I'd like to try using just plain old TCP. I have no idea where to begin, though. Hardware-wise, I am using an ethernet crossover cable to network two netbooks. ...
1
vote
1answer
2k views

iptables forwarding and routing

In fact, this question is about openwrt and CoovaAP, but I guess it's the same in other linux distributions. I've two interfaces, a "wan" and a "wlan" interface. Is there by default any filter, ...
3
votes
2answers
558 views

Modifying TG3 Broadcom driver

I was wondering whether it's possible to modify the said driver in order to prevent adapter from using embedded SRAM, and use system RAM instead. And if so, how to do it. I have a laptop with ...
3
votes
2answers
4k views

Bridge not working

We want to create bridge (mybridge) on our board over eth0 and eth1 interface. The board runs Linux 2.6.34.9. Following are the commands: brctl addbr mybridge ifconfig eth1 0.0.0.0 ifconfig eth0 ...
6
votes
1answer
6k views

Find processes using a network interface

I'm trying to find a way to safely shutdown a network interface, i.e. without disturbing any processes. For this I need to find out what processes are currently using that interface. Tools like ss, ...
7
votes
1answer
2k views

Ubuntu Linux Router: Set outbound NAT on 2 interfaces

I'm setting up a router using Ubuntu 12.04. I need my router to route between our internet modem and my client's network, for which we're given one IP address. The box has 3 interfaces: eth0 - ...
5
votes
5answers
892 views

Automatically acquire new IP address in new network

I'm running a Centos virtual machine on a laptop using a bridged network connection to avoid double-NAT issues, with the address assigned via DHCP. This works fine until I move the laptop to another ...
0
votes
1answer
51 views

::1 during exim-config?

While executing sudo dpkg-reconfigure exim4-config there is this screen (IP adresses on which exim shall listen): What does the ::1 mean? Is it an exim specific thing or - as I assume - some ...
2
votes
1answer
615 views

Make box only communicate on lan only?

I am running a VM with Debian as the guest OS (I can choose another distro). It has nginx running along with some other software. Some of the software tries to make outgoing connections (for example ...
3
votes
0answers
1k views

I can SSH and HTTP, but not ping or access particular UDP services over my LAN

So I've encountered a weird problem when trying to set up a Linux server running a variant of CRUX Linux. I am trying to configure it to be a Teamspeak server, but no clients can connect. The ...
3
votes
1answer
3k views

How to get wireless access point information from MacOS terminal

I'm trying to gather information about surrounding access points but can't find the right tools to do that. For Linux there are tools like iwconfig and iwlist, but it looks like they are not ...
8
votes
4answers
71k views

Network interface eth0 not up at start on Debian 6

I have Debian 6.0. In my interfaces file (/etc/network/interfaces) I have the following lines: auto eth0 iface eth0 inet static address 192.168.0.8 netmask 255.255.255.0 gateway 192.168.0.1 ...
1
vote
1answer
822 views

Centos 6.3 force password prompt on clicking nm-applet tray icon?

I'm using Network Manager to connect to a secure wireless network on a publicly accessible kiosk machine. The problem is, if the user manages to get to the desktop, the nm-applet is accessible by a ...
2
votes
1answer
3k views

Scan one or all ports, on UDP or all protocols, to see if I'm getting, what I suppose to get

I have a GPS localizer (TK102). I've set it up to send responses over GPRS to particular IP and over particular port. I was told that, it uses UDP. It seems that something is being sent (paid ...
2
votes
1answer
837 views

No incoming connections on Fedora 17, except on port 80

All incoming connections seem to be refused on my Fedora machine, except on port 80 with apache. The ports I have tried are 8111 and 1111, neither does work. I have done the forwarding on my ...
1
vote
1answer
687 views

Network Disabled

I have just installed ubuntu server edition in order to create a home network. But I am not able to find IP of the machine through ifconfig (showing only localhost). Then I tried lspci | grep -i ...
1
vote
4answers
91 views

Is really need Internet connection after installed all pkgs?

I know when you want to Install any new pkg then internet connection is required .right now I am using Ubuntu 12.04 I have Internet connection. using following command I installed one pkg.(e.g vlc ...
2
votes
2answers
4k views

Is it possible to run two VPN clients at the same time?

I would like to run two VPN clients at the same time: one Cisco client and one VPNC client. For now I have my VPNC client configured to route only some known IPs to the VNC interface and would like to ...
3
votes
0answers
3k views

SCTP support for Linux kernel 3.3.4-5.fc17.x86_64

I'm using Fedora 17 64-bit version, with Linux kernel version 3.3.4-5.fc17.x86_64. I installed lksctp using yum. sudo yum install lksctp-tools.x86_64 When I try to run sctp_status -H 127.0.0.1 ...
3
votes
1answer
754 views

Kickstart: one network card with DHCP, one with static IP?

I am using Kickstart to automate a CentOS install. I wanted one of the interfaces to have static IP so I wrote - network --onboot yes --bootproto static \ -ip="intended IP" -netmask="intended ...
4
votes
1answer
36k views

How to use traceroute command in unix

how to determine if the server is slow or not with traceroute unix command . Here is the traceroute Out put of a host IP . traceroute 188.165.247.43 traceroute to 188.165.247.43 (188.165.247.43), ...
2
votes
1answer
2k views

PPTP ping client to client error

I installed pptp server on a centos 6 64bit server PPTP Server ip : 55.66.77.10 PPTP Local ip : 10.0.0.1 Client1 IP : 10.0.0.60 centos 5 64bit Client2 IP : 10.0.0.61 centos5 64bit PPTP Server ...
4
votes
2answers
7k views

Determining NIC designation from PCI address

I am in the process of upgrading a legacy system from RHEL 5.4 to 5.8. There are three NICs installed, each with defined IP addresses and attached wiring. After the upgrade, the cards are on the same ...
2
votes
0answers
195 views

why is FQDN using external IP address

When postfix connects to the FQDN dur.bounceme.net it uses the external IP address: root@dur:~# root@dur:~# tail /var/log/mail.log Aug 28 04:39:45 dur postfix/master[6667]: terminating on signal 15 ...
2
votes
2answers
5k views

How is the loopback network interface implemented?

The loopback network interface "is a virtual network device implemented entirely in software," according to another question on Unix.SE. But how is this implementation actually accomplished, and how ...