Managing and using network connectivity on a unix system

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8
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2answers
12k 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
471 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
3k 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 ...
5
votes
1answer
3k 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
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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
671 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
50 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
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1answer
457 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
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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
2k 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 ...
6
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3answers
32k 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
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1answer
757 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 ...
1
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1answer
2k 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
752 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 ...
0
votes
1answer
381 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
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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 ...
1
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2answers
2k 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
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0answers
2k 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
596 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 ...
1
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1answer
15k 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
5k 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
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0answers
183 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
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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 ...
5
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1answer
666 views

Cannot FTP more than 5791 bytes

On my home Kubuntu 11.10 machine I have discovered that I cannot upload via FTP any single files that is larger than 5791 bytes. I have tried to two different FTP servers (not anonymous rather my ...
6
votes
2answers
956 views

Share keyboard over network as separate device?

I am trying to achieve something similar to this: http://superuser.com/questions/67659/linux-share-keyboard-over-network The difference is that I need the remote keyboard to be usable separate from ...
6
votes
1answer
694 views

Load Balancer Solution with linux

I need a suggestion to realize a proper solution to this problem: As you can see in the image above, I have 2 application servers that need to talk with and external third party provider over the ...
63
votes
4answers
37k views

How does reverse SSH tunneling work?

As I understand this, firewalls (assuming default settings) deny all incoming traffic that has no prior corresponding outgoing traffic. Based on Reversing an ssh connection and SSH Tunneling Made ...
2
votes
2answers
446 views

How do I route a spare network interface through an SSH tunnel?

I just bought a Raspberry Pi and I am wanting to route an ad hoc wireless network interface fully through an SSH tunnel that was created using another wireless interface. I want to do this so that I ...
1
vote
1answer
623 views

How to provide a “guest LAN” on one ethernet device

I have an always-on machine running Debian/Squeeze with a couple of ethernet ports (it's doing various serverish jobs, including DHCP) and a LAN on each. eth0 is on 192.168.7.* and has access to the ...
5
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3answers
5k views

Why can't I use the REJECT policy on my iptables OUTPUT chain?

I currently have my OUTPUT chain set to DROP. I'd like to change it to REJECT, so that I have a clue that it's my firewall stopping me from getting somewhere rather than a problem with whatever ...
3
votes
1answer
1k views

Run a command after acquiring IP address

I would like to run the command Urlsnarf -n -i p33p1 >> file when the p33p1 network interface gets its IP address. Initially I tried to run the command at bootup by adding the a crontab entry ...
5
votes
1answer
595 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
655 views

How can I stop my Linux machine from broadcasting its name on the network?

I have a Linksys router and I've noticed that when I look for connected PC's on the router, the name of my computer and MAC address of the wireless device appears. However, I've noticed that for some ...
1
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2answers
343 views

Program to manipulate Samba shares (net.exe equivalent)

Is there an equivalent to the NET.exe suite for linux systems with which I can do net view queries for example?
3
votes
1answer
246 views

Fedora16, ekiga just works in superuser mode

I've got a fedora16 running and I'd like to use ekiga as a softphone. Now I'm running into some problems. Starting ekiga as a normal user gives me could not register (globally not acceptable) ...
4
votes
1answer
5k views

How to configure pfsense to NAT servers?

How can I configure pfsense so it will NAT servers so they can be accessed outside of the company? I tried to play around with the NAT settings, but didn't get anywhere. I want to be able to access ...
2
votes
1answer
452 views

Auto connect to the wired net?

I've installed Arch linux, and planned to used it remote and putty my way in. But it does not seem to start up the interface at boot. I also want a static ip. Is there a config file like ...
3
votes
1answer
448 views

Simplest way to set up multiple subdomains to separate VMs running on single host

Problem: I´m planning to set up several virtualized centos, rhel or ubuntu guest machines on a single centos host server (most likely using KVM). Each guest VM is running an instance of a webapp + ...
5
votes
1answer
1k views

What is SSTP vpn server and how can I run one?

I've read a couple of L2TP and PPTP tutorials on the net and there are just dozens of "running PPTP/L2TP on Linux" guides available out there and I successfully made packages like open-swan or pptpd ...
1
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0answers
473 views

Debian sheevaplug internet not working

I have a sheevaplug with debian 5.0..internet was always working fine until today. I have a bunch of pcs connected via wireless to my router and internet works fine. From today though my debian won't ...
6
votes
3answers
10k views

'iwlist' -> interface doesn't support scanning (Ubuntu LTS 10.04)

I am using Ubuntu 10.04 (LTS) on a Samsung N150+ netbook. I cannot scan wifi networks using iwlist and I would like to do so. Here is the output from some tests: ...
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0answers
77 views

Creating and updating the packages for many Debian systems

I'm using a Lenny (Debian 5) for remotely controlled PC's (around 100 PC's) which will be pinging to my apache server. I'm developing a patch twice in a week to keep updated with the latest versions ...
4
votes
2answers
1k views

NAT and source IP filtering in PF, using OpenBSD >= 4.7

I just read a book about PF (The Book Of PF, No Starch), but there's one question not answered by it. If I have a gateway machine using two interfaces, $int_if and $ext_if, and I NAT the packages ...
1
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1answer
699 views

list Windows shared folders (samba) available in the local network? [duplicate]

Possible Duplicate: How to get list of computers similar to what is shown under “Network” in Windows I suspect the services shared by Windows (including shared folders) can ...
2
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0answers
494 views

VirtualBox with aMule - How to configure network, port forwarding… properly?

for security reasons I am running aMule inside VirtualBox. Guest and Host systems are Linux (to be more specific Arch 64 distro) Host system has public ip directly connected to internet (no router) ...
1
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1answer
369 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 ...
0
votes
2answers
241 views

What creates /etc/hosts (RHEL 5.5)

How does /etc/hosts get created on RHEL 5.5? It's not owned by any RPM and if deleted, it doesn't reappear on reboot, so apparently it's not a service created it. Does anaconda create it by default ...
0
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1answer
232 views

wlan is first brought to life when ethernet is plugged in

Endless timeouts... Request timed out. Request timed out. Request timed out. Request timed out. Request timed out. Reply from 192.168.1.11: bytes=32 time=105ms TTL=64 ...