Managing and using network connectivity on a unix system

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eth0 not getting disabled after setting up br0 interface

On debian squeeze, I setup a bridge based on eth0. My /etc/network/interfaces is # The loopback network interface auto lo iface lo inet loopback # The primary network interface #allow-hotplug eth1 ...
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1answer
510 views

Excessive retransmissions on Ethernet

The CSMA/CA variants of Ethernet handle excessive failed transmissions due to repeated collisions by dropping the current frame and relying on upper layers for retransmissions: After 16 attempts ...
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2answers
1k views

“PING” an AP to see if it's alive? (Before associate with it)

I would like to detect if a certain AP address is alive, i.e. by "PING" its SSID or MAC address (both known). What program can I use to achieve that? I'm making a simple script that run as root. (I ...
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2answers
3k views

Debian 6 internet problem: ifconfig doesn't show eth0

I just installed 64-bit Debian 6.06 on my ASUS K53S machine and internet is not working... Wireless is working fine. NetworkManager is doesn't show any wired connections and ifconfig in the terminal ...
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3answers
2k views

Monitoring HTTPS traffic using tcpflow

I would like to use tcpflow to monitor https requests. I have read tutorials on how to monitor http traffic but when I connect to a host using https the output is garbled. I am using tcpflow in the ...
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1answer
238 views

Can I set up linux to accept a dial up connection from my old windows95 laptop?

I've got a really old laptop running Windows 95, and I'd like to be able to connect it to my home network. It doesn't have an ethernet jack, nor a usb port. It does have an internal dial up modem ...
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2answers
592 views

Connecting to wireless router

According to this manual I tried: $ iwconfig lo no wireless extensions. eth1 IEEE 802.11bg ESSID:"g\xC6isQ\xFFJ\xEC)\xCD\xBA\xAB\xF2\xFB\xE3F|\xC2T\xF8\x1B\xE8\xE7\x8DvZ.c3\x9F\xC9\x9A" ...
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2answers
518 views

PPC Debian: eth0: switching to forced 10bt / 100bt

I recently installed debian on an old G4 iMac, and everything is working fine except that the console is constantly spammed with alternating eth0: switching to forced 10bt eth0: switching to forced ...
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1answer
796 views

Setting mobile broadband connection in Fedora 17

I am using a Dell Precision M4500. I've realized that there is a SIM slot underneath the battery slot, I suppose it is for using mobile broadband access. I am usually connecting to the internet ...
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4answers
2k views

Tools that monitor the network bandwidth based on IP?

In a networked environment, such as SOHO, is there any tools that can monitor the network bandwidth usage based on the computer's IP or mac address? So that we can know which user has the highest ...
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1answer
1k views

Network Printing in Fedora

I´m having problems setting up network printing in Fedora 16. In the printer setup box it says FirewallD is not running and gives a list of protocols that need to be enabled. I cannot find a FirewallD ...
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1answer
1k views

Extract binaries from pcap using command line (script)

As the title says, I'm looking for a way to extract binaries from PCAP's using the command line. I realize it is possible using Wireshark -> File -> Export -> http objects etc. But tshark doesn't seem ...
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1answer
853 views

pcap and raw socket [closed]

I want to develop an application (module or user-level if possible) to create a raw socket in RHEL stealing all level-2 packets directly from kernel (without being routed or handled by other open ...
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2answers
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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2answers
667 views

Meaning of log entries from an iptables configuration

My router has Linux as its OS. The system log has a lot of rows about iptable and klogd that I don't understand, could someone explain them to me? The iptables setup: iptables -t nat -A PREROUTING ...
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2answers
5k views

Driver for Intel 2200BG wireless network card

I'm trying to make work my wireless network card Intel 2200BG in my laptop Acer Travelmate 4002WLMI. I tried so far: $ sudo lshw -C network *-network:1 description: Wireless interface ...
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2answers
5k views

How to tell who is connected via vnc to my machine?

How do I check how many vnc connections or different users are currently connected to my machine? Only through wireshark? And how do I kill any other users connected through vnc?
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2answers
3k views

DNS Master vs Slave and Primary vs Secondary

I'm a little confused about the difference between a "secondary name server" and a "slave name server" and a "primary name server" and a "master name server"   I understand that a slave name server ...
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3answers
3k 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 ...
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2answers
2k views

Bringing up an interface does not add default gateway to the routing table in Ubuntu

I have this in my interfaces file: auto eth1 iface eth1 inet static address 20.135.251.218 netmask 255.255.255.252 up route add default gw 20.135.251.217 dev eth1 metric 1 ...
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1answer
2k views

multigateway routing for specific src port

I have two gateway to access internet, somehow I want to load balancing it, so far its working, but some connection or service need persistent gateway IP to be used, so the client should never change ...
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0answers
919 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 ...
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1answer
990 views

What is “link beat”?

I have a Linux 2.6 box that uses ifplugd to bring up the network. While initialising, the logs say, "Initialisation complete. Link beat not detected." and then it goes into releasing the present ...
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2answers
3k views

How do I find the process generating a lot of network traffic?

My machine is generating a lot of network traffic, all from the same source port, with many different destinations (found this out by running iftop -P, and from my router's logs). How do I find the ...
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2answers
1k views

Network file sharing between Linux and OS X

I want to share a drive/folder over the internet from my Debian machine back home, such that I can mount it on my Macbook when I am on the move. Basically I want to store my music at home and just ...
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0answers
629 views

Changes made to ifcfg-wlan0 doesn't seem to make a difference

I am running RHEL6 on my laptop. The wireless adapter configuration file ifcfg-wlan0 didn't come by default under /etc/sysconfig/network-scripts. So I created it myself. The problem is, whatever ...
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1answer
4k views

nsswitch.conf versus host.conf

Suppose that /etc/nsswitch.conf file contains hosts: files dns and /etc/host.conf file has order bind,hosts then in which order the system would use /etc/hosts and DNS look-up to resolve a host ...
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1answer
357 views

Configuring Wireless Network

After a long struggle I finally seem to have installed the non-free wireless firmware for my wireless NIC. I'm trying to set up a file server, so I want to configure the network to be static. Would ...
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2answers
12k views

Where could I find the ifcfg-eth0 file?

I am using RHEL6, but I could not find the Ethernet interface configuration file ifcfg-eth0 under /etc/sysconfig/network-scripts. Issuing ifconfig -a shows that eth0 does exist. Could it be that the ...
4
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1answer
7k views

What is the difference between virbr# and vnet#?

I am running KVM on RHEL6, and I have created several virtual machines in it. Issuing ifconfig command to the host system command line shows a list of virbr0, virbr1... and vnet0, vnet2... Are they ...
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1answer
2k views

Network Interface Names output from ifconfig

So this has been driving me nuts for a good couple of hours, so I thought I'd ask about it here (let me know if there's a better forum for this question). I have a CentOS Virtual Machine on ESXi. I ...
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0answers
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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1answer
512 views

How to get the cloned guest connected to the Internet?

I made a clone of a VM(running a version of Centos 6) on KVM, but the clone wouldn't connect to the Internet. Issuing ifconfig shows no interfaces but the lo. Interestingly, the original system can ...
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2answers
3k views

Why doesn't eth0 get an ip address when set up in a bridge?

I'm trying to understand how dhcp for IPv4 is used with bridging. eth0 is configured to be in br0. This is working just fine but only br0 gets a dhcp lease, while eth0 doesn't. Both are configured ...
0
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1answer
928 views

Why does sshd accept local network inbound connections and refuse external inbound connection?

When I try to connect to my server from the internet, I always get: debug2: ssh_connect: needpriv 0 debug1: connect to address XX.XX.XX.69 port 22: Connection refused ssh: connect to host XX.XX.XX.69 ...
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1answer
585 views

How can I resolve local IPs to hostnames? [duplicate]

Possible Duplicate: How to make a machine accessible from the LAN using its hostname I have is a simple home network with a few machines connecting through DHCP. If everyone and their ...
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1answer
2k views

ifconfig + FAILED from ifconfig on solaris machines

please advice - what the meaning of FAILED word from ifconfig command Dose its mean that network from NIC isn't stable until this moment ? Not clearly if ifconfig read network status each some mili ...
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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 ...
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2answers
4k 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 ...
2
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1answer
788 views

How to config iptables for pppoe?

When I create the only rule disabling all input, iptables -P INPUT DROP I can not connect anything. So it looks like I should allow some incoming activity to get PPPoE working correctly. What rules ...
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2answers
111 views

How do I set up a small personal network with Linux? [closed]

I want to take the time to get into building a useful network for use between my personal machines using Linux. I have spent a lot of time scouring the web for resources on how to do this but I am ...
2
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2answers
9k views

Configure a bridged Ethernet adapter in a VirtualBox guest running Scientific Linux

I installed Scientific Linux 6.2 x86 in VirtualBox on Windows 7 x64. The adapter is Adapter 1: Paravirtualized Network (Bridged adapter, Marvell Yukon 88E8056 PCI-E Gigabit Ethernet Controller) ...
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3answers
343 views

How can I view and play shared audio files through a network?

I've come up with a quick pet project (which might, maybe, even end up being useful at my home someday); the idea is to allow users of a Linux device (I'll call it A, and it'll probably be a small ...
5
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1answer
710 views

How can I control an existing remote shell?

On my remote machine, an xterm/shell has been created (by another process). I have full access to that shell through VNC. But really I would like to be using a text mode shell on my local machine. ...
3
votes
1answer
627 views

Ubuntu networking: can't connect to LAN

I have a server with Zentyal 3.03 (Ubuntu 12.04) LTS. It has 3 network devices: eth0 - dhcp fast internet (I pay for it) eth1 - static slow internet (it's free for the school) eth2 - LAN I can ...
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1answer
541 views

No network in slackware

I have just installed Slackware. I am not new to Linux but new to Slackware. I wonder how to install network in it. After the Slackware installation, audio and network were not working. This is ...
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2answers
1k views

What are the ramifications of setting the hostname?

I have several Amazon EC2 servers and I'm using Chef to manage the configuration. I'd like to set the hostname so that the default bash prompt is more helpful. Right now after launching a new server ...
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2answers
375 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.
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1answer
198 views

Usb-ethernet device

I have CP210x Composite Device. This device is USB-to-RS232 converter. When I plug it into Ubuntu-11.10, module named cp210x get inserted but I don't know why it did not create "usb0" network device ( ...
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1answer
411 views

Selecting a managed switch with Linux, for use in mesh network project (batman-adv)

I am interested in trying out batman-adv to manage a mesh network comprised of point-to-point radios (mesh links) and cellular modems (gateways). Each node would have one p2p radio, and some nodes ...