Managing and using network connectivity on a unix system

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1answer
16 views

Network translation, one to one, not one to many

Desired scenario: a small subnetwork of Linux machines, all accessible through another Linux machine (acting as an IP router). These machines would be pre-configured with addresses on a private ...
4
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1answer
369 views

Fedora 20 dosen't accept correct PIN for mobile broadband

I have a problem with the WWAN (Qualcomm Gobi 2000) in my Lenovo ThinkPad W510. I can not unlock my SIM card with the correct PIN. I enter the PIN in this dialog and after this I get immediately ...
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0answers
8 views

how to connect to VPN only when ethernet is down and 3g is up

is the following possible and how could it be implemented. set up /etc/network/interfaces file so the VPN "tunnel" only connects when the ethernet cable is disconnected and the 3G interface "ppp0" is ...
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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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1answer
611 views

Public-Key Authentication w/ Jailed SFTP User

I'm trying to set up a jailed SFTP user account on my own local machine to test an application with libcurl. I used this guide to help me figure out how to set up a jailed SFTP user: ...
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2answers
20 views

Trying to connect through cl

I am trying with: $ sudo iwconfig wlan0 essid mynetwork key 4bare2011 $ sudo iwconfig wlan0 essid mynetwork key 4bare2011 mode Managed and similar combinations. I'm using Ubuntu 14.04. The key ...
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1answer
1k views

Terminal server (ser2net) to configure new HP procurve switch

Switch: HP ProCurve 2910AL-48G - J9147A This switch is brand new straight from HP. Anyone familiar with ser2net for creating a terminal server to connect from usb>serial>console port on a HP ...
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1answer
4k views

How to set up an Internet Connection in Linux Mint?

My machine has wired Internet connection with Windows 7 OS. In connection properties I see service name : ispone obtain IP address automatically obtain DNS server address automatically How do I ...
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0answers
29 views

centos virtual machine not registering with intranet dns server

When I am creating a Ubuntu virtual machine on virtual box it automatically registered with DNS server in my intranet network, it has both intranet IP and domain name. When creating CentOS virtual ...
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1answer
44 views

I can ping internal to outside but not from outside to internal (Static IP)?

I have a static IP provided by the administrator of my Linux CentOS 6.5. The problem is that while I can ping this machine, connect to it and use it to access the internet from within my network, I ...
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0answers
29 views

Debian Jessie: My LAN is not working!

I can connect to the Internet without a problem by using wireless networks. I have a DSL connection on defined which can connect to the Internet when LAN is connected. When I plug-in network cable, ...
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0answers
8 views

iptables packet header capture and compare

We are using multicast program to listen up multicast data from our provider, there are couple cases where the multicast having issue: 1. their server hang, hence no multicast data received from our ...
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0answers
23 views

how to open up socks/SSH on different network interfaces?

iptables -A PREROUTING -i usb0 -t mangle -p tcp --dport 8080 -j MARK --set-mark 1 iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain ...
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1answer
94 views

Network interface not registring ARP response

I have a server with two NIC and it's running Ubuntu Server 14.04. The first one is the interface "p3p1" and it's connected to the subnet 192.168.1.0/24 with the IP 192.168.1.100. The second one is ...
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1answer
789 views

AP randomly gets unreachable for the clients while hostapd is running

I got an old PC running as router which has 3 NIC and 1 wifi PCI card TP-Link L-WN751ND. This box runs Debian Wheezy, hostapd, dhcpd etc. The problem is that AP randomly gets unreachable for the ...
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0answers
57 views

Port Forward For OpenVpn

I have setup a OpenVPN server on CentOS 6, and it starts ok when i /etc/init.d/openvpn start it shows me Starting openvpn: [ OK ] so far so good, but ...
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1answer
71 views

Route Client Traffic Through VPN Tunnel

I have configured a vps following this tutorial, the server and client are successfully connected and can ping each other, server is at 10.8.0.1 and the connected client (android-OpenVPN Connect) get ...
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1answer
17 views

Configuring Named DNS zones (Centos7), specifically CNAME

having trouble with some DNS configuration, I have managed to get part of the site working, however adding the prefix 'www', I'm finding a little tricky. Essentially, what I want is mysite.net -> ...
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1answer
34 views

ubuntu 13.04 wifi lost connection - how to get it work again? (broadcom4313)

I am new to ubuntu, meaning I have a lack of funded knowledge and skills, but I hope I provide any necessary information you need to know for solving the problem. My problem is that I moved to a new ...
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1answer
53 views

Does each network packet cause an interrupt to CPU?

While I know that lot of packet processing(CRC calculations, packet segmentation handling, etc) can be offloaded to NIC, then does each packet still cause an interrupt to CPU? Is there a difference if ...
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0answers
19 views

Bridging/Sharing a networkable printer in freebsd

I'm trying to "bridge" a ricoh laser printer to the rest of my network with a freebsd box, I have some other services running on there, such as mediatomb and have been using it as a file/media server. ...
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1answer
33 views

how to test if can connect to port in rhel 7 (telnet client?)

On my local machine some network application is launched on port 3333 and I want to check that it "accepts connections". In this case in Windows I just type telnet to launch telnet client, and then o ...
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0answers
30 views

How to use dhcpd on two network interfaces?

I have an embedded system that has Ethernet and wifi. I want to setit up in a way that it provides IP to both interfaces. The system uses BusyBox. and I an new in this area. can you provide a sample ...
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0answers
19 views

Execute CGI scripts on custom OMAP4 board as root

I have a Ubuntu 12.04 Custom Board running Apache2. I have a web page which calls a CGI script which is responsible for starting and stopping ipsec service. I access the web page from another machine ...
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0answers
18 views

System wide proxy with encypted ISA server request

I recently install Linux Mint Debian on my computer. It is working fine and I also have internet. But just firefox is able to get through the proxy. After some research I found out that the ISA ...
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0answers
156 views

AIX NIM Master replicate / sync fails to an Alternate Master

I am getting a error when I try to replicate / sync my NIM database and resources to an Alternate NIM Master newly created in my environment: error replicating resources: unable to ...
1
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1answer
51 views

How can I manually reset RX / TX counters in ifconfig output without impacting data delivery?

CentOS 5.9 I'd like to reset the RX/TX counters in ifconfig output for an interface. My understanding is that these counters get reset during a reboot but I'd like to avoid rebooting. Is there ...
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1answer
90 views

BOOTPROTO=none | static | dhcp and /etc/resolv.conf

What does it mean when it says BOOTPROTO=none in the /etc/sysconfig/network-scripts/ifcfg-eth0 file. I remember there used to be BOOTPROTO=static and it was very clear and straight-forward in telling ...
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0answers
17 views

Internet not working on GNOME

I am running all my systems on a windows platform. I am having a PC with the above mentioned OS (This PC is introduced specifically for a project). On this PC I had given the IP address in the range ...
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2answers
44 views

Ubuntu cannot find or detect new wired network adapter

I want to use two ethernet cards on my machine. So I've physically inserted the new ethernet card in to my machine. However when enter the ifconfig -a command Ubuntu cannot find or detect the new ...
1
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1answer
31 views

Converting unix command to windows [closed]

I have been provided a command to use in unix, however, I want to perfrom the same operation in windows. Is it possible ? It's a network configuration command that apparently interacts with a server ? ...
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6answers
8k views

How to remove mounted locations that have been added using the mount command?

I've mounted few shared locations using the below command. mount -t cifs /mnt/systemfolder -o username=name,password=password //10.10.1.1/My-Shared-Folder A few incorrect locations* have been ...
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1answer
655 views

Port Mirroring in Fedora? [closed]

I have set up an application that listens constantly to a port for network packets, and I would like to create another one that receives the same network packets ( for use as a test bed). Getting the ...
0
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1answer
30 views

Frequently Internet Disconnects

I have installed RHEL 5.8 on IMB server. Also I have configured static IP through eth0. When I try to ping any website e.g. google.com, yahoo.com It works only for 25-40 seconds and internet ...
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0answers
70 views

How to route pakets from an aliased interface towards a gateway?

I'm having trouble setting up the following: Router IP: 192.168.1.1 PC Eth0 - 192.168.1.104 Eth0:1 - 10.0.0.1 (must be an alias) Besides ip_forward enabled, what should I add to iptables rules, so ...
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1answer
992 views

netstat shows an ESTABLISHED connection with no process

I am debugging some problems with postfix. When I establish a connection nothing happens and netstat shows: $ netstat -anp ... tcp 0 0 129.132.202.106:25 129.132.179.232:60154 ...
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2answers
5k views

I'm not able connect internet from vmware player with centos

I installed centos 6.4 and when I installed I set the network config. But somehow centos did not save them. Now I forced server to use dhcp but it is taking wrong IP address and it is not able to ...
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1answer
1k views

Ubuntu: wire network is not stable and must restart network-manager periodcally

I don't know why my wire network now is not stable. After a short time of using, maybe 30 minutes, 15 minutes or maybe just 2 minutes, my network is down. When my network is down, I must run this ...
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4answers
75 views

How to display the IP address of the default Interface with Internet connection?

I need to create a script that outputs the internal IP address, that is configured as the default Interface.
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1answer
261 views

Networking not working on ubuntu server 12.10 on B75MA-P45 mobo

Just got some new parts to but together a local development server with Ubuntu server 12.10 and I can't get networking working. I have an airport extreme for my router and it works find with CentOS ...
3
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0answers
43 views

Unable to start network, <IP> is already in use for device eth0, but its not

A wierd issue after we migrated some of our servers to a new DC. We assigned new IPs to all the machines and all the servers are working fine except one. It is not picking up the new IP address and ...
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0answers
3 views

Nas/Switch/ DD-WRT Router, Interesting Problem [migrated]

I had a network setup that consisted of the following. WNR2200 [router] with DDWRT [Firmware: DD-WRT v24-sp2 (06/23/14) std] running on it, connected to a Netgear 8p Gigabit [Switch]. My laptop and ...
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2answers
4k views

D-Link DWM-156 HSPA USB Modem doesn't work with SIM card inserted

I have a D-Link DWM-156 HSPA modem, that I bought just a few days ago. The modem has drivers in its internal storage. There are Debian packages (.deb) for both i386 and amd64, so obviously I installed ...
4
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1answer
387 views

How can I most simply transparently bridge traffic between wlan0 and eth0?

I am looking to do this on a Raspberry Pi, but I don't mind which operating system I have to install, so the easiest most out-of-the-box solution for Pidora (Fedora 20 Remix), Raspbian (Debian) or ...
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2answers
603 views

Route wlan0 to openVPN tunnel and rest to eth0

I'm having problems to create route/iptables rules for following configuration: I have an openVPN server (tun type) running on my raspberry machine at home At work i have company pc (behind proxy) ...
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1answer
53 views

How to forward IP traffic between wlan0 and eth0 without killing network performance on the forwarding machine

I have a laptop running Debian 7 that connects to my building's Wifi. I want so share this network connection via the laptop's Ethernet port. I have setup a script below to do this based on some ...
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1answer
466 views

How to monitor network performance for each application in FreeBSD / PC-BSD?

I'm using a PC-BSD workstation, and I would like to know if there is a way to monitor which app / process is using the network. I use a Mac OS X (Mavericks) laptop, and the "Network" tab in the ...
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3answers
77 views

What's the most effective way to detect nmap scans?

As the title says, I am interested in detecting any nmap scans directed on a (my) GNU/Linux host. I would like to use snort in combination with barnyard2 and snorby for this, or if possible to perform ...
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0answers
26 views

How do you connect app and DB servers from separate containers?

With Docker, how can I make the DB in one container accessible by the app server in another?
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2answers
555 views

Command/scripts to check the Reverse DNS Lookup time

I am working on a project in which one master communicates with numbers of slaves. For that it has to make connection with hosts in network. But sometimes it hangs. I think that the reason behind is ...