Managing and using network connectivity on a unix system

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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 ...
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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
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1answer
636 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 ...
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1answer
20k 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
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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 ...
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2answers
6k 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
189 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 ...
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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
709 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
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2answers
1k 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
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1answer
767 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 ...
76
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3answers
45k 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
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2answers
478 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
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1answer
702 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 ...
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3answers
6k 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
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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
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1answer
681 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
713 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 ...
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2answers
366 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
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1answer
258 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
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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
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1answer
485 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
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1answer
483 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
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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 ...
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0answers
481 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
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3answers
12k 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
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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
736 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
533 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
400 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 ...
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2answers
252 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
237 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 ...
1
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2answers
2k views

Setting up ad-hoc in Debian with DHCP?

I made a quick search and found a doc that showed me a way to setup ad-hoc. Only problem is that I need this to work with my phone (WP7) and I'm not able to set a static IP on the phone so I need the ...
2
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0answers
962 views

SOCKS proxy configuration on KDE 4.4.5 / Debian 6.0.5

I've been trying to use a SOCKS Proxy which I have been using with success from an Ubuntu 11.4 box with GNOME on my Debian box with KDE.The socks server is bound to the local port 1080 through the ...
1
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1answer
235 views

Monitoring interface changes with udev, especially if a route is set

Is there a way to monitor interface up/downs, especially to check if a route is setup or removed, with udev?
1
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2answers
2k views

Communicate between Ubuntu VM and Windows host

I'm running an Ubuntu VM on a Windows 7 host. I have two questions: I think that on Windows, localhost is a loopback address, and sending packets to it doesn't actually transmit any data on the ...
1
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1answer
961 views

tcpdump and https

Why following command doesnt grab the packets to faceebook site sudo tcpdump host facebook.com and dst port 443 but next grabs sudo tcpdump host java.com
3
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1answer
2k views

Start network service at boot time on CentOS

I've recently reinstalled CentOS onto a computer of mine. I have OpenSSH Server on it now, as did I before I reinstalled the operating system. Here's the difference: Before, SSH started without even ...
1
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0answers
358 views

What problem have I caused to eth1 by resetting my ubuntu machine?

I am using ubuntu 10.04 (Bio-linux 6.0). Last night I tried leaving my system in hibernate mode because there appears to be a bug in this version of ubuntu such that if I do a straight shut-down, the ...
3
votes
1answer
3k views

Heartbeat 3 binding socket error

I've been tying to install Heartbeat3.0.5+Pacemaker1.0.12 on CentOS 6.3 64bit via yum. The installation seems to be successful, but there is a problem when starting Heartbeat. I put some info related ...
4
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1answer
2k views

Is berkeley packet filter ported to linux?

I am doing some research to figure out what distro's of linux contain kernel packet filtering and are compatible with BPF. http://kernelnewbies.org/Linux_3.0 http://lwn.net/Articles/437981/ These ...
5
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1answer
457 views

How to make sure OpenVPN is connected?

I need some sort of "safeguard" for my VPN connection. If the connection drops, the machine shouldn't even reach the internet. (I can reach the machine by other means.) Is it possible somehow? If I ...
5
votes
3answers
2k views

How can I know the process name which is opening a tcp port?

I have two linux servers. Let's say they are C and S. C is client of S On my S machine, I type. $ netstat -an | grep ESTABLISHED tcp 0 0 192.168.1.220:3306 C:57010 ...
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11answers
64k views

Cannot enable network after CentOS 6.3 fresh install

I am trying to perform a fresh CentOS 6.3 installation then run various yum commands such as yum install httpd. The installation runs fine, however I cannot run any network based commands like yum I ...
3
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1answer
6k views

Add another IP address to a Bonding Interface

I have a Linux network Bonding interface for two Ethernet interfaces (eth0 and eth1) $ cat /etc/sysconfig/network-scripts/ifcfg-bond0 DEVICE=bond0 BOOTPROTO=static ONBOOT=yes ...
2
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2answers
914 views

SIOCSIFADDR: File exists after upgrading kernel

Since upgrading my (Gentoo) kernel from 2.6.38 to 3.3.8 (via oldconfig), I can't get the network on eth0 up anymore. It reports "SIOCSIFADDR: File exists" with a number of other SIOCSIF* errors that ...
9
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3answers
5k views

How do I get to use .local hostnames with Arch Linux?

If I'm using Ubuntu or Linux Mint (the only two flavours I've tried and know work for sure), I can run something like this: wayne@myhost$ ssh wayne@otherhost.local And the name is automagically ...
7
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1answer
3k views

Why is ping so slow?

My setup: Server in the cellar + GBit switch. Long cable to the roof. GBit switch. I have three computers in the roof. One has only 100MBit ethernet, one laptop with GBit and a new computer. Ping ...