Managing and using network connectivity on a unix system

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SSH DNS lookup on local IP addresses

As I have come to understand, SSH always goes through the process of reverse DNS lookups whether you are connecting to user@example.com or a local server calleduser@192.168.0.56. I do not know, ...
2
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1answer
923 views

redirect web server with no-ip and port forwarding in livebox

I want my Apache web server running on a Livebox (home router appliance running Linux) to be accessible from the Internet (WAN). I installed and configured the application noip2 on my Ubuntu PC. ...
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1answer
3k views

No IP address on VMware running centos 7

I just now installed Cent OS 7 on my VMware 8 and I am not able to connect it to a network. I checked the VM network and its mapped to the physical NIC. The same setting work like charm on my CentOS ...
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1answer
43 views

SSH takes too long to ask for password

I've seen many other questions on this subject but none seem to actually solve my problem. Like any other day, I connect to my LOCAL Raspberry Pi server from my client machine at 192.168.0.5 with ssh ...
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0answers
21 views

Can detect but not connect to 5ghz?

One night I found out that I could no longer connect to my 5Ghz network. It happened rather suddenly. My fear is that it's a problem with the card, because I also cannot connect on Windows. I can see ...
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91 views

cannot ping nodes on same ad-hoc network with certain adapters

I'm setting up an ad-hoc network made mostly of Raspberry Pis and I'm running into a problem where nodes using certain wireless adapter cards cannot interact with other nodes on the network. I know ...
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1answer
19 views

Add parameters to NFS mount

I try to start Android on device via NFS and TFTP. Everything goes good until Android system starts booting. Something happens with network parameters and connection falls and boot freezes [ 60....
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1answer
1k views

Arch Linux Ethernet to WiFi bridge

I want to use a Raspberry Pi running Arch Linux to extend my WiFi network. My situation is that I have a spare WiFi router that I want to use to expand my WiFi reception range as well as give me a few ...
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0answers
9 views

iptables routing input and forward paths

I would like to know the flow of a packet given the configuration below. Suppose that I setup an adhoc network between my android phone and a NIC on my linux box. I then setup the android phone to ...
2
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1answer
28 views

Why does reading /proc/net/tcp take a long time ss is quick to return the same sort of data about the connections table?

On Linux 2.6.32, if you read (for example, cat) /proc/net/tcp, on a very loaded system (for example, a web server), you will find that reading 100K entries takes over 30 seconds. That's a long time. ...
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0answers
22 views

Multicasting with a Debian Router

I have a local network and I want to use NTP in multicast mode on this LAN. The first step to do this is to get multicast networking to work first. In the network I have 5 Debian machines all ...
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29 views

How to forward every packets to another IP? [on hold]

I am doing an experiment for my master thesis. I want to run a function (e.g. multiply two 10-digit) when a specific packet is received (e.g. a packet with destination TCP port 6666). How can I do it? ...
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1answer
2k 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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0answers
50 views

Ubuntu not allowing traffic to ports 1 - 1024

I seem to have encountered a weird issue whereby my ubuntu box is not allowing incoming traffic to the first 1024 ports or so, for both TCP and UDP. My iptables policy is set to ACCEPT for all 3 ...
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3answers
22k views

No longer able to reach the Internet on Kali Linux

I'm running Kali Linux on VirtualBox and trying to learn some of its basics. I know it's based on Debian but I come from Windows so I'm new to Linux and networking in general. My problem is that ...
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0answers
24 views

SoftIRQs and Fast Packet Processing on Linux network

I have been reading about performance tuning of Linux to get the fastest packet processing times when receiving financial market data. I see that when the NIC receives a packet, it puts it in memory ...
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1answer
3k views

Accounting for /proc/net/dev reported traffic

I noticed that according to /proc/net/dev I am constantly receiving around 6Kb/s on my wireless usb interface. But I can't account for anything even close to that with the individual connections that ...
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0answers
20 views

Shutdown problem on Lenovo G50 after installing Linux Mint 17.3

After installing successfully Linux Mint 17.3 on Lenovo G50, its not rebooted. The error is : [397.188708] Fixing recursive fault but reboot is needed! [400.538090] init: mdm main process (2363) ...
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1answer
42 views

Debian - No wired connection after restart

Last night I was working on my computer, for reference I'm using i3, and decided to uninstall XFCE4, as I felt I didn't need it. The next morning I turned on my computer and have no wired connection. ...
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0answers
25 views

Bash check if firefox use internet

I want to check how much internet use Firefox with a shell script. Here I found good examples to see performances. #!/bin/sh free -m | awk 'NR==2{printf "Memory Usage: %s/%sMB (%.2f%%)\n", $3,$2,$3*...
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0answers
14 views

/etc/network/interfaces automatically startup pppoe on wireless lan (wlan0) on boot and also make it persistent

I do have the following setting OK in /etc/network/interfaces: auto wlan0 auto dsl-provider iface wlan0 inet static address 192.168.XXX.XXX netmask 255.255.255.0 broadcast 192.168.XXX.255 wpa-ssid ...
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2answers
26 views

find IP and PORT in use by Apache

How can I find which IP:PORT Apache web server is monitoring? There are some network commands, but they show the TCP port in use. The machine has multiple network interfaces and the Listen section in ...
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2answers
1k views

Wait for a network device to come up before bringing another network device up on boot?

I'm in the middle of setting up my Raspberry Pi running Raspbian as a bridge between my university's wireless network (which requires WPA2-Enterprise authentication) and my private wireless router (...
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2answers
42 views

Ping from subinterface

I have a sub-interface eth0:0 auto eth0:0 iface eth0:0 inet static address 192.168.2.96 netmask 255.255.255.0 gateway 192.168.2.1 and I try ping -I eth0:0 8.8.8.8 and I ...
2
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1answer
3k views

forward packets from one interface to another interface using iptables

I have an embeded system with 2 interfaces e0 and m0, whose ips are 10.0.0.20 and 192.168.0.20, respectively. Incoming packets into e0 have an ip of 10.0.0.10 and should be forwarded to m0 interface ...
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2answers
1k views

Bonding two broadband connections to serve LAN as a gateway

I need to increase the connectivity and speed of the Internet to my LAN users. These are the things I have in my hand to do so. PC with 3 NICs 1 for LAN and 2 for routers 2 broadband connections ...
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1answer
436 views

NAS set-up issue with NFS protocol in linux Mint

I have a Synology NAS that I'm trying to map in my Linux machine as if its like a regular HDD drive. I have looked all over the internet without being able to figure out how this thing works. I have ...
0
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1answer
2k views

scp ssh: connect to host 10.0.0.109 port 22: No route to host lost connection

I use SCP command on Debian Linux to transfer a file to my colleague via LAN. But I encounter the problem: $ scp filename.file username@10.0.0.109:/tmp ssh: connect to host 10.0.0.109 port 22: No ...
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3answers
1k views

Prevent Zypper trying to use IPv6

I'm setting up a box with OpenSUSE 13.1. For reasons beyond my comprehension, Zypper utterly insists on using IPv6 addresses and refuses to use IPv4. Which is a problem, since IPv6 doesn't work on our ...
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2answers
40 views

Assigning static IP address using nmcli

So I'm trying to give a VM a static IP address, this case has been particularly suborn. the VM is running on a ESXi cluster with its own public IP range. I had it sorta working with an ipv4 address ...
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3answers
880 views

Internet connectivity issues due to wrong MAC address (using Linux Mint 17.2)

I am new to Linux. Today, I installed Linux Mint (17.2) and tried to connect to the internet via a broadband connection. My Internet Service Provider (ISP) provided me with a fixed MAC address that ...
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3answers
1k views

Is there some way I can start a (repeating) ping while the network is unreachable?

My ping command (on Debian 6 or 7) will repeatedly attempt to ping a server even while the network is down, if the network was up when it was started. Is there some way to start ping while the network ...
0
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1answer
25 views

bridge or route wlan traffic to eth

Have been trying to make a laptop share its wireless connection via ethernet to other devices, but am getting nowhere. First tried bridging, but soon found out bridging wireless interfaces is not that ...
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0answers
636 views

Improving TCP performance over a gigabit network

I have two machines both network cards speed is 10Gbps. The inbound bandwidth between the two machines is 10Gbps, the outbound bandwidth internet bandwidth is 500Mpbs. Both machines are using public ...
0
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1answer
390 views

How to access my webserver from the host machine? [duplicate]

My host OS is Gentoo, guest OS - Fedora. I have a web server on Fedora on port 8686 and it works perfectly on guest OS, but I can't access it on my host OS. I tried to use bridged network (then I got ...
2
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2answers
3k views

Redirect the default HTTP port to an application

On my CentOS server at mydomain.com, I have an svn web application running on port 8880. I want to hide the port: at this moment, if anybody wants to access, they need to access through http://...
1
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1answer
38 views

Connect network namespace to internet

My scenario is this: I want to be able to execute a program in a separate namespace with a network interface of its own. But I also want it to be able to access internet though my physical network ...
0
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1answer
287 views

Unable to access http service intranet

I'm not sure if this is the right place, if this is the case I will move the question with no problem. I'm setting up a web server for testing Wordpress. Everything works fine if I try to access the ...
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2answers
831 views

two NICs in the same subnet— need to set up routing

I have a tricky case: +---+ +----+ |D1 +->eth0---------<-eth0-+D2 | | | | | | +->eth1---------<-eth1-+ | +---+ +--...
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2answers
2k views

Best way to find out what Linux Version is used on a Webserver

Is this feasible? Can I find out which distro is used to host specific webpages? Whois doesn't have info for this.
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0answers
35 views

Unknown network connections in nethogs (is it safe?)

It's about a month that I see some unknown connections in nethogs and I tried to understand what program is responsible for them but I failed. I'm not sure but it seems that my Internet connection ...
7
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1answer
437 views

Networking looks OK, but does not work at all [closed]

I am trying to get networking to work on Sabayon X KDE Edition. I have configured wireless networking using the NetworkManager applet and networking looks OK. However, I can't connect to the ...
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2answers
299 views

Unable to connect to certain IP address, but able to connect to other IP in same subnet

I'm running a 14.04.2 LTS ubuntu box in a DMZ with IP of 10.10.30.35 and I have the following network mystery. I'm trying to connect to another unix box outside the DMZ but in our internal network at ...
4
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2answers
87 views

Linux DNS Suffix Configuration

Introduction I have a Raspberry Pi running Rasbian connected to a Windows Server based network. This is a corporate (education) network that has its own intranet consisting of all connected computing ...
0
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1answer
21 views

Resetting network interfaces when waking up from suspension

I carry my laptop in "suspended" state and routinely use the Ethernet port. When I move it, the usual sequence of event is: suspend, unplug all the wires (power, Ethernet), put in bag, move, take from ...
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why I can't log-in into my PS TP link WPS510U via browser [closed]

I've a TP link printer server WPS510U which is set to default factory. By NetworkManager or manual terminal configuration I've set a manual IPv4 address for an ad-hoc connection with my PS (192.168.0....
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2answers
1k 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
781 views

SSH to Linux Container from Other Machine

I am trying to learn about Linux Containers and this is my first encounter with servers, ssh and many other things that I do not know the terms yet. I create five different containers and authorized ...
4
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1answer
3k views

Networking and Samba from a quest OS running on qemu

I'm trying to test some software on a big endian system to ensure compatibility. My plan is to use qemu on Ubuntu 12.04 to emulate a MIPS system. So far I've been able to create the quest system ...
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2answers
24 views

Client route for OpenVPN Access Server

I am running OpenVPN Access Server and I'd like to push a route to every client on connection that is the equivalent of: sudo ip route add 172.17.0.0/24 via 172.27.232.1 Where should I go to set ...