Managing and using network connectivity on a unix system

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841 views

Ubuntu : after upgrade, wire network is unstable

Yesterday I have upgraded to Ubuntu 13.04. After I upgrade, I have a serious problem with network (I use wire network): my network is unstable. After a short time using it, it often disconnects. It ...
1
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1answer
481 views

What's the best way to have a 169.254.169.254 address local to my laptop?

I want to emulate the Amazon EC2 metadata service on my local system for testing. In EC2, this runs on 169.254.169.254. I understand that this is the designated range for pseudorandom local addresses ...
12
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5answers
41k views

How to check whether firewall opened for a port but not listening on the port

We will be deploying a new application to a Server and the application will be listening on port 8443. We have asked Network team to open the firewall for the port 8443 on that server before deploying ...
2
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1answer
1k views

How do I route different users over different OpenVPN tunnels in Linux?

The setup: I have multiple, static-key OpenVPN client/server configurations, labeled "client1", "client2", and "client3" with server/client IPs 10.10.1.1/10.10.1.2, 10.10.2.1/10.10.2.2, and ...
1
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3answers
190 views

Determining network interface names in NetBSD

Does anyone know if there is a way to determine what a network interface will be called in NetBSD if you know which NIC/driver you will be using before hand? I'm trying to automate parts of a NetBSD ...
2
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3answers
357 views

Detect which interface traffic to an IP address goes through

I'm making an script, and I need to detect in what interface is the traffic of an IP going through. This is because in the arch, an IP address is attended only for one of four NIC's, but can be any of ...
1
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1answer
713 views

Cannot connect to belkin router through linux mint

I recently installed Linux Mint 13 alongside windows 7. I have a Realtek RTL8191SEvB Wireless Card. This work's fine with any router. However when I try to connect to a Belkin G Wireless Router it ...
1
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2answers
589 views

Creating an Alias to Loopback Interface with an Arbitrary Name

I have an odd problem that seems simple enough but has evaded me thus far. I am attempting to support a legacy application that has a hard-coded ethernet device name ("eth0"). This hard-coding, I am ...
7
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2answers
6k views

wlan number assignment

How or where does Linux determine the assignment of a network device? Specifically, wlan0 or wlan1 for wireless USB devices. I plugged in a TP USB wireless a while ago, and it was assigned wlan0. I ...
4
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1answer
909 views

How does irqbalance determine which package to use?

irqbalance --debug shows the following: Package 0: Core 0, 2, 4, 6, 8, 10, 12, 14 Package 1: Core 1, 3, 5, 7, 9, 11, 13 When I run network applications, it seems like IRQs are being handled by ...
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0answers
603 views

Create adhoc network when disconnected from network

I am using ArchLinux and want to create an AdHoc network automatically when the connection to the home network drops (or the home network can't be connected to on startup). How can I achieve this? I ...
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1answer
265 views

Manage network connections on Arch Linux

I'm setting up an arch linux system(latest version) on my laptop. It already boots and configuration for network it's done via systemctl. Following instructions on the wiki I configured the ethernet ...
3
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2answers
95 views

Scan for users of networks

If I am in a room where several people are using devices to connect to different networks, how can I scan for them? (for the users) They are not necessarily logged in the same wifi as me. I know ...
1
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1answer
413 views

ixgbe: increase rx performance

I have an Intel 82598EB 10GBE NIC. I need to receive traffic without packet loss. Data rate is 4-5 Gbps, packet size is 1500-9600 bytes. I had already configured smb and irq affinity. I also tried ...
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0answers
980 views

nas4free server can't access local network

I'm not a linux/unix/freebsd expert. I'm a Microsoft .NET developer that knows Windows pretty well. Please bear with me :) I'm trying to configure an old desktop machine as a NAS device with ...
2
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0answers
66 views

How to specify which interface an application uses?

Imagine this example: you have direct access to the internet on eth0, and you have a VPN on tun0. You want one application to access the internet directly through eth0 (using X public IP address) and ...
0
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1answer
608 views

Transfer 150GB of files from an old MacBook Pro with Ubuntu 13.04 Live DVD

My girlfriend's old MacBook Pro 2009 (5,4) stopped working. I have tried several times to reinstall OS X, but could not do so. There appears to be something really really wrong with the OS. Since she ...
2
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2answers
347 views

Can I have a bridged interface without an IP?

I have 2 NICs: eth0 & eth1 on a host OS which runs some VMs (LXC) under it. The hosts eth0 is connected to a private network and configured as the primary interface. The hosts eth1 is connected ...
3
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5answers
212 views

find which system is transmitting through a particular port

I am using command nc -lu <port no.> to find on given port any data is receiving or not. I am getting data if there is transmission going on (but don't know from where!). Is there any way that ...
0
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1answer
123 views

What do I need to setup a linux box as a proxy to access the network?

At the minute I have all my machines connect directly to my isp-supplied broadband router. I want to make sure my machines are behaving correctly so I wish to test this by sniffing the traffic of ...
2
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1answer
502 views

Linux Mint Stops Network File Transfers to Load Data into RAM

I've never seen or heard anything like this before, and I can't find anything else online that is at all similar. I've upgraded my network to gigabit and have been transferring large files lately ...
2
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2answers
90 views

how do I network my desktop to my laptop?

How do I network my desktop to my laptop? They both use my linksys router wired internet and I have a large selection of distros that I can use once I know what is called for. I run about 3-4 distros ...
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1answer
440 views

How to SSH apache user from a remote guest server on VirtualBox with host-only network?

I have two CentOS virtual machines on VirtualBox . one of them let's say CentOS-1 holds my Web application code. Second is CentOS2. I have two network connections between these two servers : Bridged ...
3
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1answer
2k views

I opened a port with iptables but still doesnt work

I have a CentOS installation as a guest VM with VirtualBox. I have two ethernet interfaces, eth0 with NAT and DHCP, and eth1 with Host-only adaptor and static IP. I have oracle installed in this ...
1
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1answer
119 views

Adblock rule to block g+ / twitter / etc. [closed]

Looks like this rule works to blocking facebook domain, when not visiting the facebook domain (ex.: "like/share" etc. buttons on other pages then facebook): ! don't allow facebook outside facebook.. ...
3
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2answers
1k views

I want to expose “easy” URL's for machines on a home network. Is custom DNS/BIND the answer?

I recently convinced my room mates to cut the cord and go cable free, and they've found it pretty great so far. I'm in the process of setting up a pretty sweet, mostly automated home theater setup ...
0
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3answers
611 views

Fedora 18 host cannot ping Windows XP guest

I have my laptop running Fedora 18. I want to run a Windows XP guest using VirtualBox 4.2.6. My configuration seems correct, here is my networking report. Fedora 18 host lo: ...
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2answers
42 views

can't update with this error messg

I got this message: not enough free disk space.... The upgrade needs a total of 31.8 M free space on disk '/boot'. Please free at least an additional 31.8 M of disk space on '/boot'. Empty ...
2
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2answers
2k views

Iptables port forwarding to qemu vm

Is it possible to create an IPtables rule that forwards all incoming traffic on port 80 on the host to port 80 of the qemu VM? Is such a scenario possible with qemu?
1
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1answer
308 views

Why does my 3G key blocks my eth0 interface and how to solve this?

I have a linux PC (Debian Squeeze) which is located into a room in another town (I cannot physically access to this PC from where I am) This PC is linked to internet using an internet box. I can ...
0
votes
1answer
303 views

Postfix header_checks

I want to forward a copy of the users email which has the specific subject. I have tried the below settings, able to Redirect that particular subject mail. But I want to forward a copy of that mail to ...
2
votes
1answer
363 views

Explanation of bandwidth management script calling tc

I have some scripts in Linux to manage internet bandwidth, but I do not understand what they do. What is the meaning of the following scripts: tc qdisc add dev $IF root handle 1: htb default 256 tc ...
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1answer
225 views

Display ONLY IP addresses of currently logged users

I want to get a list of the currently logged users and their respective IP addresses. I tried the following command line: w -s However, the TTY, IDLE and WHAT columns are also displayed. I don't ...
2
votes
1answer
2k views

Could not resolve host error

I'm using Arch Linux and I have a dynamic ip address with the use of dhcpcd. I can access websites through the google chrome but the problem is that I get 'could not resolve host' error when I run ...
2
votes
1answer
4k views

Iptables forward with pptp and openvpn

I have OpenVPN and PPTP installed on a VPS. I'm having a few questions that I can't seem to get a firm answer on. I want to install OpenVPN on 1.1.1.1 (eth0, public IP address) and PPTP on 1.1.1.2 ...
5
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3answers
8k views

Check outgoing network traffic

In Ubuntu, how can I check what information is being sent through the network connection, what programs are doing it, and what sites is my computer connecting to? I am not paranoid about security, ...
2
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1answer
67 views

switch network on and off of a virtual remote server

I need to perform a testing panel which disconnects a network cable and connect it again on a specific virtual server via a php web page. I found that ip & ifconfig can disconnect a network, but ...
0
votes
1answer
54 views

No internet access for system services; however, browser access works

Unable to reload repos via apt-get, aptitude, or synaptic. Dropbox does not connect or sync. Pithos does not connect to pandora.com. Chrome and Firefox browsers do work fine. I have been unable to ...
6
votes
2answers
17k views

eth0 not being configured automatically

When I start an ubuntu 12.10 instance, eth0 is NOT getting configured. davidparks21@MySqlDB:~$ cat /run/network/ifstate lo=lo When I manually edit ifstate and add eth0=eth0 and service restart ...
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0answers
130 views

Modifying resolv.conf when when bringing network interface up on system startup

My Linux box currently has a network interface that allows me to connect to a network on a different subnet. I've achieved this by modifying the routing table when the network interface is brought up. ...
4
votes
1answer
1k views

tc on bridge port

I have a 4 port bridge: root@Linux-Switch:~# brctl show bridge name bridge id STP enabled interfaces br0 8000.000024cd2cb0 no eth0 eth1 ...
1
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0answers
733 views

I have a route to the network but from the traceroute output it doesn't leave the server

I have an HP-UX box and I'm trying to determine why a host can't be reached. I'm trying to reach the host 10.32.13.146 root@hp-ux:/root # traceroute -I 10.32.13.146 traceroute to 10.32.13.146 ...
3
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4answers
31k views

Ubuntu: How to configure DNS servers in /etc/network/interfaces correctly for resolvconf?

All examples I have seen of configurations (/etc/network/interfaces) showed that you configure an interface and then underneath that gave the dns-* lines such as: auto eth0 iface eth0 inet static ...
0
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1answer
124 views

What are the other congestion control algorithms specially designed for lossy Wireless Networks like LTE and WiMax?

I am trying different congestion control algorithms for getting maximum throughput and minimum delay across my setup for TCP flow.Please suggest other available algorithms apart from Veno, ...
0
votes
1answer
113 views

Problem in connecting server to Internet

I just have setup a Linux server. But currently I am having problem in connecting to the outside world. I am not able to do wget,apt-get or ping. Here ar some relevant details: $ping google.com ...
5
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1answer
234 views

Ways to give a process “idle” network priority

When I'm playing a game, I don't want Dropbox taking hogging my network connection. I have been able to noticeably reduce my latency by turning it off while playing. The same is true to a lesser ...
0
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1answer
461 views

How to troubleshoot high kernel time (high network usage; high interrupts)

I've noticed that I have high kernel time when doing a lot of network traffic in Linux. I also noticed that 45% of my CPU is spent doing interrupts. How can I further troubleshoot this?
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1answer
11k views

Cannot reach outside network or IP after upgrading to Ubuntu 12.04

I am running Ubuntu 12.04 on my server but since the upgrade from 10.04 I can no longer reach any outside sources of the server. I can SSH into the box, but from inside here I can not reach anything. ...
0
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1answer
3k views

OpenSuse 12.3 keeps renaming network interfaces?

After installing OpenSuse 12.3 (x64) on a server box with a single (onboard) NIC (assigned to eth0), all works fine so far (static IP, static route, no "Network Manager" - just the good old way). ...
4
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0answers
176 views

To what extent does LXC manage configuring the network interface in a container?

In the LXC config file we can specify an IP address for a container: lxc.network.type=veth lxc.network.link=br0 lxc.network.ipv4 = 10.1.0.35/16 lxc.network.flags=up lxc.network.hwaddr= ...