Questions Tagged With network

Open office pkg issue in yum

kalalharshal — Thu, 14 Aug 2014 03:06:38 -0400

Hi, I have configure yum & adding the rpm packages of openoffice in /var/ft/pub/rhel but when I was listing the packages by using yum list all the it will not show in the list. what is problem regarding to list in primary.xml. help me?

Sar command to monitor network traffic on eth0 along with CPU utilization for 48 hours

piyush128k — Wed, 06 Mar 2013 10:57:03 -0500

I am trying to understand the network activity from a few servers along with CPU utilization for 48 hours only. I am new to sar and maybe i am not writing the syntax correctly.

sar %util -n ALL eth0 -e[48:00:00] -f /tmp/piyush

Download speed of router is same as download on laptop with router connected via ethernet

Samprat — Wed, 02 Jan 2013 18:13:08 -0500

Setup -> 1) Wireless Product with Access Point in managed mode say Product Name is Alpha. Alpha has an FTP Server installed in it.

2) Router with Access Point in Master Mode. 3) Net-book with windows 7 installed.

Product IPAddress Net-book 192.168.1.10 Router wi-fi adapter 192.168.1.1 Alpha (wireless Product)waln0 192.168.1.7

Router is connected to net-book via Ethernet cable. The LAN port of Router is connected to Net-book . There is no other connection of Internet or any other wired connection.

My Task is to download the files from alpha to Router and measure download speed of router.

Alpha product is successfully connected to Router and I can ping router from Alpha. At this point I tried to ssh into router from netbook with port 22 but it refused to make connection. How will I make ssh connection? 2) I can ping from my net-book to Alpha. I failed to understand how this work even though I have not connected net-book to router nor to alpha. 3) My main issue is to measure the download speed of router . At this point I can telnet into router but I don’t know username so I failed to login but when I tried to do ftp from net-book to Alpha it works . My question is downloading the files on net-book is same as downloading on router . I am more interested in download speed of router does not care about file downloaded or its contents. Could someone please throw light on it? Thanks ....

jabber/opensource IM server

tuxthepenguin — Mon, 10 Dec 2012 17:02:36 -0500

i am searching for any tutorial or education course to setup IM/jabber chat server. anyone has suggestions?

Two virtual networks over one LAN?

MisterK — Wed, 14 Nov 2012 02:37:34 -0500

My home-network is somewhat complex. I have a cable-modem which via a switch is connected to my router/firewall for serving internet to my actual LAN, but the same switch also connects via powerlan several set-top-boxes to the same cable-modem. This means that near some TVs I have two powerlan adapters, one serving the needed connection to the set-top-box and another giving internet access to PS3, Wii, XBox, ...

The cable-modem itself gives different IP addresses based on the MAC address of the client. As such the set-top-boxes get a 10.x.x.x address and other clients (my Linux firewall) get actual global internet addresses. So, there are already two IP ranges going over the same network at the end of the cable-modem, but since I'm not sure of the safety of that part of the network (read: I don't trust the cable company), I want the rest of my network behind the Linux firewall ...

So, to finally come to the question: is there a way to have the cable-modem connect directly to my Linux firewall (so getting rid of the switch inbetween) and then have the Linux firewall pass traffic for the set-top-boxes (so specific MAC addresses) as-is to the LAN, including that those devices would then get a DHCP address directly from the cable-modem (through the Linux "bridge"), while at the same time for all other devices in the LAN the Linux firewall actually acts as firewall, proxy, dhcp server, etc. giving out 192.168.0.x addresses and having itself one single real internet address which it gets via DHCP from the cable-mode?

If I setup a bridge between WAN and LAN, I assume I can still filter on that bridge via iptables, but can I run a dhcp client on one end of the bridge and a dhcp server on the other? If so, how? Anyone able to give me a clear description on how to get something like this up? I'm going to run Ubuntu Server on the firewall (which also acts as home-server and controller for my solar-panels, so a full-fledged Linux is wanted), but if I can get general instructions to get me on the road, I probably can figure out the Ubuntu specifics myself...

Thanks in advance, K

restart one network interface (SOLVED)

itamarm — Fri, 01 Jul 2011 11:27:10 -0400

hi,

I have several network interfaces connected to different netwroks on my Red Hat server. I have added a new link and configured it - /etc/sysconfig/network-scripts/ifcfg-eth4. Now, when I am doing ifconfig eth4 down / up the ip I had set is not written on the interface the only way to set those definitions is by service network restart, which restart's the other interfaces.

is there any way to start only the specific interface with it's new definitions ?

Mobile broadband under Ubuntu 10.04

BobH — Wed, 10 Nov 2010 16:20:02 -0500

Hi,

As this is my first ever post, please excuse me if I have overlooked some obvious source of info.

I seek help with getting a virgin Mobile Broadband G3 dongle working under Ubuntu 10.04 on a Dell laptop. I think I am quite close to having done it, but I can't quite get there. The problem may simply be that I do not know what to respond to the network manager.

The dongle is badged as Alcatel. When I plug it in, it initially flashes orange, then - now that I have installed usb_modeswitch - it changes to flashing green, which I think looks promising. (However under some circumstances it changes from green to red later)

The outputs from lsusb with and without the dongle inserted differ by the line:-

Bus 002 Device 005: ID 1bbb:0017 T & A Mobile Phones

I'm not sure what I expect to happen, but nothing does. So I assume I need to configure it with the network manager. Here I get stuck.

Going to the main menue on the upper panel and following system->preferences->network connection->Mobile Broadband->Add, I am offered a few screens in which I am asked the Provider's country, namelyBritain(UK), The Provider for which I choose Virgin Mobile from a list of options

I am then asked my plan, which I do not know, and I have not found anyone at Virgin who will tell me (even when they understand my question). Consequently I have just accepted the suggested "default". The same screen asks me for my plan's APN, but the dialogue box for the APN is not active, so I cannot enter it there. The box contains a feint "vdata", the significance of which I don't know, so I have tried clicking Apply.

That takes me to a screen which, under the tag "Mobile Broadband" has some details which I appear to be able to change, including vdata

Under "Basic" I have number as *99#, and username and password both blank. From reading posts by people who have made this work, I believe those are correct responses.

Under "Advanced" I have APN as vdata and Network and Pin both blank. Again from other posts I think the two blanks are probably correct, but I believe that vdata should be something else. I have tried changing it to VirginMobile and to VirginBroadband but neither appears to get me any closer to a connection. Again I have hit a brickwall trying to get anyone at Virgin Media to tell me what the APN should be.

Any suggestions welcome.

random wireless disconnections (lucid lynx)

dr. Hannibal Lecter — Wed, 09 Jun 2010 11:18:47 -0400

I'm using Ubuntu 10.04 and I'm having problems with my wireless connection. It simply stops working randomly.

I thought the cause might be a number of connections or something like that, but it's not. Sometimes it stops working while you're off doing something unrelated to the network.

Also, once it stops working, I'm unable to connect anymore until I reboot the machine. Some say it might be a problem with NetworkManager, but I can't use the recommended wicd because it won't even connect (it seems like hidden SSID + wep bothers wicd).

I'd also like to note that I have a windows PC connected to the same router and it never drops a connection like that, so there's obviously nothing wrong with the router.

Any hints would be helpful. I'd like to drop NM altogether if possible, but I'm not aware of any good alternative.

Edit:

lecterror@feck:~$ lspci -nnk | grep -i net -A2
07:00.0 Network controller [0280]: Intel Corporation Wireless WiFi Link 5100 [8086:4232]
    Kernel driver in use: iwlagn
    Kernel modules: iwlagn
09:00.0 Ethernet controller [0200]: Broadcom Corporation NetXtreme BCM5764M Gigabit Ethernet PCIe [14e4:1684] (rev 10)
    Kernel driver in use: tg3
    Kernel modules: tg3

lecterror@feck:~$ rfkill list
0: acer-wireless: Wireless LAN
    Soft blocked: no
    Hard blocked: no
1: acer-bluetooth: Bluetooth
    Soft blocked: yes
    Hard blocked: no
3: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no

sudo iwlist scan got me a large list of available networks, I'm assuming you don't need it if that's the expected output :)

Edit 2:

No dice! :( My "solution" in the answers below didn't work, in fact it made everything worse, disconnections every few seconds. dmesg said this:

[ 1170.188961] wlan0: deauthenticating from XXXXXX by local choice (reason=3)

I have no idea what it means, but it sure as hell wasn't by MY local choice!

For now I've reverted to NetworkManager and the funny thing is that is seems more stable than before(?). Possibly due to WEP->WPA switch, but I can't be sure..

Any ideas?

Monitor LAN widget/screenlet/plasmoid

GreggC2006 — Sun, 16 May 2010 14:15:56 -0400

I am looking for a screenlet that looks like the folderview screenlet that will display computers in my workgroup and alow me to launch them in nautilus. Does such a thing exist??

WiFi in Ubuntu 10.04

kICKSTARTBUBBA — Wed, 05 May 2010 16:55:54 -0400

Have windows Vista and Ubuntu 10.04 on SAME hard drive in a Gateway T-1620 laptop, Vista uses Wifi but in Ubuntu it Fails and states message "Wireless is Disabled" Mt question is "How do I enable IT {wifi}. 60 year old Linux Newbie w/Experience looking for Answer

Bridge firewall with iptables; how do i block incoming traffic except for specified ports, and allow outgoing traffic?

Zyprexa — Sun, 02 May 2010 20:15:10 -0400

Im having problems with iptables not doing what i want :(

I have a Ubuntu computer set up as bridge between gateway and lan, with the lan connected to eth0 and eth1 connected to gateway.

I'm trying to get it to basically block everything incoming except for the ports i specify (www, smtp ++), but also allow outgoing traffic. I've found, tried, modified some examples i found on the web, but still it wont block incoming traffic (ie, im still able to reach my webserver)

These are the rules im running now, and i can't figure out why it wont block incoming:

#!/bin/bash

iptables -F
iptables -X

iptables -I INPUT -i eth1 -j DROP
iptables -I INPUT -i eth0 -j DROP
iptables -I OUTPUT -o eth1 -j REJECT
iptables -I OUTPUT -o eth0 -j REJECT

# connection tracking (not entirely sure what this does, but tutorial said it was needed)
iptables -I FORWARD -m state --state INVALID -j DROP
iptables -A FORWARD -i eth0 -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT

# allow outgoing traffic
iptables -A FORWARD -i eth0 -o eth1 -j ACCEPT

# allow ping
iptables -A FORWARD -p icmp -i eth0 -o eth1 -j ACCEPT
# stop incoming
iptables -A FORWARD -i eth1 -o eth0 -j REJECT

iptables -S gives me

-P INPUT ACCEPT
-P FORWARD ACCEPT
-P OUTPUT ACCEPT
-A INPUT -i eth0 -j DROP
-A INPUT -i eth1 -j DROP
-A FORWARD -m state --state INVALID -j DROP
-A FORWARD -i eth0 -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i eth0 -o eth1 -j ACCEPT
-A FORWARD -i eth0 -o eth1 -p icmp -j ACCEPT
-A FORWARD -i eth1 -o eth0 -j REJECT --reject-with icmp-port-unreachable
-A OUTPUT -o eth0 -j REJECT --reject-with icmp-port-unreachable
-A OUTPUT -o eth1 -j REJECT --reject-with icmp-port-unreachable

Any advice on what im doing wrong is appreciated :(