Managing and using network connectivity on a unix system

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3
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1answer
20 views

Proxify dns queries for bash command

I want to use different dns server (not tor, any dns server i set) for certain terminal command. Say it would looks like $ DNS_SERVER=8.8.8.8 dnsify ping example.com and it uses google dns. I know ...
2
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0answers
34 views

More than 255 Linux GRE tunnels

Is it possible to set up more than 255 GRE tunnels in Linux? It seems that 255 is the default maximum, but is there any way to increase the limit?
1
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0answers
21 views

How to permanently update /run/network/ifstate [closed]

I had a system (ubuntu server 14.04) installed on a machine with only 1 NIC. I moved the hard drive to one where there is two. I can properly configure my network, but each time I edit ...
0
votes
0answers
27 views

Internet connection proflem on CentOS and Redhat linux

I am new on CentOS and installed dual boot with windows 7. I am using a local isp internet on my windows7 system but can't access through centos. On centOS system, using the same IP, DNS, and Server ...
1
vote
2answers
22 views

Adding recursive entries into `/etc/hosts`

I'd like to add shorthands for various FQDNs into the /etc/hosts file, such as: pyrrha.compsci.university.org. pyrrha Is there a way to force the local DNS resolver to process the /etc/hosts ...
0
votes
0answers
14 views

Renaming build name while build is running on a port

We have a client that hits a server(tomcat) and on that server we have deployed builds which runs on different ports. To understand better lets say we have four builds running on four different ports ...
0
votes
1answer
32 views

New Kernel does not automatically reconnect to network

I tried playing around with compiling my own kernel. Everything is fine so far, except for that one thing. Whenever I leave a wifi network or unplug my ethernet cable the system does not recognize, ...
0
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0answers
45 views

Networking of a new ip?

So I was trying to forward my new ip address, but It completely messed up the networking of the entire box, does anyone know how I could get this to work? The ips are correct, just do not know about ...
4
votes
3answers
63 views

How to skip DHCP if no cable connected to ethernet in Debian

My Bananian Linux is wasting time at logon trying to get a DHCP lease for eth0 interface which is not connected. Well, the extender cable is connected to it, but nothing is on the other end. I have ...
-5
votes
0answers
62 views

dns queries not answered plus broken https

I am on kali linux which means debian wheezy. I didn't change or install anything new,it just came out of the blue when i booted in. I am alone on the network. Router is D-link 2730U I was just ...
0
votes
0answers
22 views

Can't access http anymore

My computer A is connected to an AP with an access to the internet. (interface called new0) I cannot have more than 1 computer connected to this AP. (authentification) I wanted to share internet, so ...
1
vote
1answer
32 views

Networking fundamentals: what IP is assigned a NIC if there is no successful DHCP negotiation?

On Windows computers, when there is no DHCP server found on the network interface, it gets assigned some IP address like: 169.254.x.x So it is supposed you can find it on the network using tools ...
4
votes
2answers
75 views

How can I use Linux as a Gateway?

NOTE: If client devices (computer B in this example) want to obtain internet through the gateway computer, maybe they still need to configure nameserver resolution. This is not explained here ...
0
votes
1answer
20 views

netctl using wrong interface

After a recent Arch Linux update, my ethernet interface somehow got renamed from enp4s0 to enp5s0, as shown by ip link. After correcting this in my profile /etc/netctl/dhcp, and starting sudo netctl ...
0
votes
1answer
70 views

Centos 7: failed to bring up/down networking: configure interface for a trunk interface

The switch configured on the server (Centos 7) is configured as trunk for VLAN#115,2014. I have loaded # lsmod | grep 8021q # modprobe 8021q I would like to configure an IP address on the server ...
0
votes
1answer
62 views

how to access Internet using modemmanager and not network-manager

i all I recently bought a tata docomo dongle. On inserting it I got the below details :- Aug 05 17:30:46 think-debian kernel: usb 1-2: new high-speed USB device number 5 using xhci_hcd Aug 05 ...
0
votes
1answer
27 views

server mointoring / intrusion detection for home nas

I'm looking for some kind of monitor or intrusion detection to monitor my NAS. The following things I would like to monitor: Incoming network traffic (source -> Router -> NAS) from another country ...
0
votes
0answers
108 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 ...
1
vote
0answers
13 views

Why is a Linux Tun interface not returning ICMPv6 Echo replies?

I wrote a program which connects to a TUN interface and replies to ICMPv6 Echo Requests. Even though I can successfully observe the echoes and replies with tcpdump on the TUN interface, it appears ...
0
votes
0answers
31 views

Only loopback Ubuntu on Hyper-V

I'm alreay running an Ubuntu server under Hyper-V on NIC 1 (eth0) and now I want to implement a second one on NIC 4 (eth3). Just like with the first server a virtual switch got created without fixed ...
0
votes
0answers
34 views

Installing drivers for the ASUS AC-51 Network Adapter

I'm not very good at installing drivers for these 3rd party devices manually. The provided instructions in the "readme" have poor grammar and I'm not experienced enough to fully interpret exactly what ...
0
votes
1answer
23 views

Network access behaviour problem

I have Debian Wheezy 64 bit installed on my PC. The problem is that in some situations I can only ping localhost and 127.0.0.1 and don't have access to outside world. And in other cases I can ping ...
0
votes
1answer
25 views

Open ports with no associated PIDs

I have some open ports on my laptop but netstat is not reporting which PID/Program is associated with them: $ netstat -tulpn (Not all processes could be identified, non-owned process info will not ...
4
votes
2answers
71 views

Stop writing to a capture file after it reaches a specific size

I'd like to monitor my network traffic of an specific interface to file. Then I would like to stop the interface if the traffic counts over 60mb total. Is there a possible way to do that?
1
vote
0answers
31 views

Arch Linux network issues [closed]

Installing arch on a 64 bit virtualbox vm, following the Beginners' Guide I got to the configure your network part, and I had ran pacman -S dialog, succesfully, but when it came to pacman -S grub ...
0
votes
1answer
47 views

How to set IP based on interface name (not MAC) on Centos 6.5

I'm trying to automate the network interface setup that will be used on identical boxes. The boxes have 3 different NICs. Each of the 3 NICs have different MAC prefixes that I can use to differentiate ...
1
vote
1answer
22 views

FTP not happening on RHEL 6 Server configured using a Vm Player 11

I am not able to ftp to the server server from a client. I am using my base machine as Ubuntu 14.04 . Below is the ifconfig output:- raghav@raghav-HP-15-Notebook-PC:~$ ifconfig eth0 Link ...
1
vote
0answers
55 views

Error mounting NFS unit between synology server and RaspberryPi client

I'm trying to mount an NFS (v4, or v3.. but get the same error...) from a Synology Server to a RaspberryPi client. But I get this error: mount -t nfs4 IP_address_of_server:/volume1/nfsnvf /mnt/nfsnvf ...
1
vote
1answer
32 views

Network Configuration for Rocks Cluster

So I'm trying to set up a Rocks cluster and seem to be failing at the network configuration part, as I can not get an internet connection in my final install. So the address of that computer that ...
0
votes
1answer
32 views

Is the return value “-1” of the function socket close() method possible?

Under which circumstances is it possible to produce a return value of -1 when closing a network socket using it's close(int fildesc) method? I suppose it is possible with an invalid fildesc number, ...
0
votes
2answers
24 views

KeepAliveD Documentation

I am looking for a consolidated documentation for KeepAlieD. My apologies if this is not the right place to ask this question. However, even after extensive googling for 2 days, i could not find a ...
1
vote
1answer
25 views

Incorrect iperf configuration?

I have a laptop (with Ubuntu) and a router (with OpenWrt). When I check the version for both, the laptop says I have version 2.05 for multithreads and the router says I have 2.05 for pthreads. Both ...
0
votes
0answers
12 views

PPTP IPs different than LAN ips

in /etv/pptpd.config I have: localip 1.0.0.1 remoteip 10.0.0.100-200 my server real IP is 192.168.1.40 (my LAN is 192.168.1.0) is it OK to do it? how I can route it so the clients with ...
0
votes
0answers
48 views

Why do SSL negotiation fail on Linux? (Asus P5S-MX) (but worked on Windows7)… FIXED, but UNRESOLVED

Can anyone tell give me hints to why the web requests fails in these wireshark/tcpdump traces ? (and perhabs hint to why a linux distro would start with SSLv3 as starting point) I a noob when it comes ...
1
vote
3answers
82 views

How to resolve hostnames with Raspbian 5/5/2015?

I'm relatively new to Linux and falling down the tree and hitting every branch on the way down (it seems). I'm trying to share an NTFS drive, or a directory on the drive, via samba, and I have found ...
1
vote
0answers
20 views

Default lxc networking suddenly stops to work

I've recently installed lxc on ubuntu 14.04. Networking used to work (lxcbr0 being a NAT interface, DHCP configured using dnsmasq) but after a container restart, the networking does not work any more. ...
2
votes
1answer
33 views

Disabling wlan0 adapter

Question: What is the terminal command behind right clicking on the wireless icon (Ubuntu 15.04) and then unchecking "Enable Wi-Fi" the box? Why am I asking it? macchanger just work for me when I ...
0
votes
0answers
37 views

Iperf connection failed

I have an openwrt router connected to my ubuntu laptop with an ethernet cable. I installed iperf on both, and now I am trying to run commands (i.e. iperf -s), but I keep getting the following errors: ...
0
votes
0answers
13 views

AODV Routing protocol on Raspberry Pi model B?

is it possible to run the AODV routing protocol on rpi ?
1
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0answers
16 views

Can't access host-only network when on two interfaces

I'm trying to use a host-only connection with my VirtualBox VM. My VM is set up and can ping the host (192.168.56.1) on vboxnet0. If I disconnect the host from my local network (internet access) I ...
2
votes
1answer
64 views

what does none in “tun0@none” stand for?

In the output of ip a I just got the lines: 4: tun0@NONE: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 100 What does the NONE in there ...
0
votes
0answers
190 views

Realtek RTL8111 Network card not working on Ubuntu 14.04

I'm trying to install an Ethernet Card into my Ubuntu 14.04 desktop computer. Here is my lspci output (First one is my new ethernet card): 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. ...
0
votes
1answer
36 views

Loop commands to network daemon?

I'd like to feed a network daemon using a loop! To be more specific: There is a network daemon listening on localhost:portx. The daemon expects me to guess a PIN between 0000 - 9999. I want to use ...
0
votes
1answer
44 views

Install brctl for OpenWrt - which package?

I'm getting an error in OpenWRT Attitude Adjustment that says: -ash: brctl: not found when I run brctl addif br-lan mesh0 I tried: opkg update opkg install brctl But I got this error: ...
0
votes
1answer
46 views

Set up interfaces file on Debian for Lan

A friend set up my Raspberry Pi so that it creates its own wireless network and I can connect to it through SSH over the air. The /etc/network/interfaces file looks like this: auto lo iface lo inet ...
1
vote
1answer
61 views

NetCat ignoring (not sending) network data to broadcast addresses

If I run these NetCat below commands (no error messages at all) during a WireShark capture running (capture filter= udp dst port 4000) : luis@Zarzamoro:~$ echo "Hello" | nc -w1 -4u 255.255.255.255 ...
3
votes
1answer
111 views

Bash: Permission denied when trying to echo data directly to Network

I am trying to send characters directly to the network stack as explained in this thread. Even when the process work OK under CygWin (Windows), the same lines do fail on Ubuntu v14.04: ...
4
votes
1answer
38 views

Turn off network on Raspbian

I'm trying to set up cron to turn off networking on my Raspberry Pi during the night (from 23:00 to 8:00). The problem is that none of this commands do the job: $ sudo service networking stop $ sudo ...
2
votes
1answer
74 views

Is it possible to echo characters directly to network?

Even when this is a network problem, I would say this is rather a Unix/Linux experienced users question. I am trying to manually send a network magic packet by using echo and redirectors (file ...
1
vote
1answer
41 views

How to get systemd-udevd to create a bridge device at start up?

I am running Ubuntu server 15.04 in a virtual machine. I am able to use the brctl program to create and manipulate networking bridges. I've decided to persist the setup (through reboots) by updating ...