Managing and using network connectivity on a unix system

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How do I safely perform the below changes to network parameters on Solaris 10?

I need to change and test some TCP/IP network parameters on a Oracle Solaris 10 as a possible workaround for a bug in 'Oracle Hyperion EPM 11.2.1.0' in the development environment. I am not a ...
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0answers
606 views

Ubuntu 10.04 kvm Virtual Machine guest network speed slow

i have the following situation, i have a kvm host ubuntu 10.04 LTS 64-bit network host speed is perfectly run , as i am testing network speed using iperf , the speed between any network device and the ...
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2answers
172 views

2 ip ranges / 1 nic OR why does one ip range follow default route before local routes

Updated at the bottom I'm using Centos as a router, and just replaced the routing system at work. I've got 2 routers to send data around. For the most part it's working. On one router I have 2 ...
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1answer
3k views

How do I access a web server behind NAT and proxy?

I have installed a local web server for an web application for a customer. Their server is behind NAT and uses proxy for access internet. Is there a way to access the web application remotely from ...
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2answers
8k views

“Network unreachable” outside of LAN

I have a Linux server which runs several services (namely Minecraft :)). Recently, I've been having trouble getting it to connect to the Internet. For example: root@fcwtech:~# ping google.com ping: ...
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1answer
564 views

In bash, can I asynchronously open sockets and use them later?

I had no idea that Bash supported so many advanced features! I started working on a simple network program to try and use some of these things I found. My particular program is a basic redis client ...
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0answers
216 views

Trying to install DIP (Dialup Networking) package for SLIP protocol

We are trying to interface with a wireless modem that connects to a computer via a com-port DB-9 connection. It uses SLIP in the sense that the modem hosts a SLIP server and requires the interfacing ...
2
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1answer
6k views

Only routing certain traffic through VPN

I have a central development server, running a VPN server, and a couple clients that need to connect to it. The server is running Apache, but is only accepting local requests (only listening on ...
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1answer
535 views

Tunnel AFP over SSH over Internet

I can't seem to figure out how to connect to AFP over SSH. Here is my setup: [Raspberry Pi] <---> [router] <---> (Internet) <---> [Client] I'd like to be able to connect to my ...
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0answers
805 views

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: ...
2
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1answer
314 views

Make a linux network device a router

I am developing an IPv6 network device driver. It should behaviors like a router, i.e. send router advertisement regularly. But now my device is working like a node, send router solicitation. What ...
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0answers
761 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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1answer
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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2answers
2k views

Can connect to wireless router but can't browse internet

I have a Dell Studio 1450 running Fedora 17. I installed a new wireless router in the office recently. And everybody apart from me is able to connect to the internet via it. Google revealed ...
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1answer
621 views

Why does dladm rename-link fail with “invalid argument”?

I am running Solaris 11.1 (in a VM) and have two NICs installed. At a root console, if I type dladm show-phys, it lists net0 and net1 and some info for each. I want to name the links more ...
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2answers
4k views

How to forget/remove Mobile Broadband connection settings from Mint 14

I've been using Ubuntu for a while now and wanted to switch to Mint. I connected my mobile broadband dongle (Vodafone) for the first time like in Ubuntu it all went fine but subsequent connections ...
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1answer
1k views

How to fix networking driver boot load failure after replacing hardware?

After replacing the motherboard, which is the same as after replacing the network adapter interface hardware (NIC), our Debian 6.0.6 no longer loads the networking driver on boot. The manual approach ...
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1answer
5k views

How do I set up several interfaces all bridged onto eth0?

I have found several guides to bridging a single interface (eg br0) onto eth0 but none for multiple interfaces (eg br0, br1 etc). Is this possible?
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1answer
4k views

Debian, two network cards - “no route to host” on eth1

I have added a secound nic in a debian box. That nic is ment for doing some test stuff, so those devices connected should just be able to access the debian box or be accessed from it. To set up the ...
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2answers
1k views

Bandwidth, CPU & Memory stats returned in single line from terminal

I'm trying to create a simple monitoring system that will show a graph of sales that is linked entirely to data of bandwidth, CPU and Memory stats as they relate to sales. So if I sale 1 widget per 5 ...
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1answer
3k views

Wireless problem with RTL8723 and Fedora 18: can't connect to a wpa2-secured network

I'm running Fedora 18 on a Toshiba laptop with the notorious RTL8723 wireless card. I've been able to compile the driver using lwfinger's instructions from this forum thread here wget ...
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0answers
132 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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1answer
5k views

The n mode on “iwlist wlan0 scan”

I know how to determine if scanned AP uses B or G mode, but how to know (using "iwlist wlan0 scan") it uses N protocol ? if I use "iw dev wlan0 scan" and see if the cell has a "HT capabilities" block. ...
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1answer
3k views

updating `/etc/resolv.conf` on a read only filesystem

I currently have a busybox based embedded linux system. The filesystem is a readonly mounted jffs2 filesystem. One problem I've run into is that /etc/resolv.conf can't be updated by DHCP. Is it ...
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1answer
718 views

Why does wlan1 not get a static IP?

I have a Raspberry Pi with two USB wlan adapters. wlan0 is configured with DHCP and wlan1 is configured with a static IP address and hostapd (access point) is running on this interface. The adapter ...
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3answers
628 views

OpenSSH - map aliases in ~/.ssh/config to IP addresses in command line

Is it possible to query ~/.ssh/config in the command line? Let's say I would like to retrieve what IP address does the particular alias point to in a separate program, is it possible?
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1answer
1k views

Default value for SO_RCVTIMEO option on Solaris

Is there any way to find out what is the default value set for option SO_RCVTIMEO on Solaris 10? If there is a way to find out how would one go about changing it? P.S. I am aware of ability of ...
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6answers
16k views

Cannot delete bridge - “bridge br0 is still up; can't delete it”

I have the same problem as this guy : Bring down and delete bridge interface that's up But that solution does not work for me. I remove all interfaces from the bridge using brctl delif . I then ...
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0answers
462 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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3answers
886 views

Averaging output of dstat

I need to average upload and download speed using dstat -n. How can I add all the received and sent data sizes that appear after dstat -n, so that I can add them and find average upload and download ...
2
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1answer
3k views

What to use for firewall testing (port opened or not)

so... we know that we can test that if a port is open on the firewall with: telnet SERVERIP PORT ..but afaik there are services that can't be tested with telnet, because ex.: telnet doesn't know ...
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2answers
3k views

OpenSUSE - Ethernet adapter up but can't ping the router

OpenSUSE 12 LAN driver is up and running: me@here:~> /sbin/ifconfig eth0 Link encap:Ethernet HWaddr 00:1A:4D:F9:93:F2 inet fe80::21a:4dff:fef9:93f2/64 Scope:Link UP ...
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1answer
8k views

Bonded network interface is not available after a reboot

I have some servers with multiple network interfaces, setup with bonding and some VLANs. Whenever I reboot the server, one of the bonded network interfaces is not reachable from other servers, nor can ...
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0answers
475 views

Failed to execute shell script from “network” udev rule to change the MAC-address

I am trying to execute a shell script from udev rule, when a network interface is added, as follows: SUBSYSTEM=="net", ACTION=="add", KERNEL=="eth*", PROGRAM="/usr/local/bin/changemac.sh", ...
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1answer
2k views

Redirect Packets from ppp0 interface to ethernet interface in linux

My question is similar to this question, however with some change. I have a PPPoE connection on my Linux Machine (CentOS kernal 2.6.32) as a client, so that when I setup this connection, another ...
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5answers
20k views

copying files from unix to windows?

Is there any way to automate the process of copying the files between windows and unix without doing it manually, using tools such as winscp. I need to copy files from unix to windows such by ...
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4answers
83k views

How do I know what service is running on a particular port in linux?

I am trying to run weblogic server on my linux machine and I am getting the following error : ERROR: transport error 202: bind failed: Address already in use ERROR: JDWP Transport dt_socket failed to ...
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0answers
155 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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2answers
346 views

What is the advantage of a network installation?

Looked into a network installation of fedora there. It seems you need to setup http & ftp servers on the host along with booting from a cd. So what are the advantages of installing linux over the ...
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2answers
4k views

Equivalent for netsh start network on linux

I recenty read about the Windows option for creating an access point, that will run on the same physical device, as the machine. So that I can connect my other devices to that network, and have access ...
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2answers
3k views

Ensure torrent client uses openvpn

I recently signed up to a VPN provider and to log in, I use network manager for my normal wireless connection and then start the openvpn connection from network manager. In my browser I can check ...
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1answer
322 views

Using xdg-open for accessing network with normal explorer

I'm working with small network and I want to start network explorer from a terminal. When I tried to type xdg-open network:///server it opened google chrome and did nothing. I also tried to type ...
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0answers
346 views

PC BSD Warden network interface

The documentation for PC BSD's Warden mentions that the configuration of the right network interface is crucial. However, it doesn't say what the "right" interface is. This may sound like a stupid ...
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2answers
736 views

Second loopback network interface (for netem)

I would like to add a second loopback network device on Linux, so that I have lo and (e.g.) lo2. This is so that I can use netem to simulate a throttled network over lo2 without compromising my ...
0
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0answers
336 views

Parameters of optimization TCP / IP in Linux Mandriva

In the registry of Windows XP can find the following options to enable optimizations for TCP/ IP: - MSS; - TCP Rx Window Size; - SACK (Selective Acknowledgment); - ECN (Explicit Congestion ...
0
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1answer
128 views

Is port knocking good for a last chance when everything is locked out via the Firewall?

Based on this question: "Safe mode" on Linux? - So there is a configured knockd on a server, and a wrong firewall command was given out, so everybody got locked out from the server via ...
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1answer
104 views

Remote linux using vnc and gdm without login

I remote linux server by using vnc and gdm. This link is very good but I would like to remote linux server using vnc viewer without login. May I know your suggestion?
3
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1answer
4k views

Definitive way to configure network devices in Centos 6.2

What is the definitive way to configure network devices in Centos 6.2? Via network manager or editing /etc/sysconfig/network-scripts? I have a notebook with 1 ethernet port and a usb ethernet adapter ...
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1answer
1k views

network interface does not become active although onboot enabled

Due to some other conflicts, I disabled/stopped NetworkManager in Fedora 15, Now, for network configuration I used system-config-network-gui to config & enable Ethernet interface, Problem is, ...
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3answers
15k views

Mounting Directory - Connection Refused

I am trying to mount a Directory from my server to my local machine. This is because I want to edit the directory and execute the files without having the manually push the files to the server after ...