Managing and using network connectivity on a unix system

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Oracle Linux 7 Network Manager

I have Oracle Linux 7 and would like to create a server with a static IP address. Then I would like to create it as a template with vCenter and clone it to make a cluster of virtual machines, each ...
3
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2answers
62 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?
7
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1answer
899 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 ...
3
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2answers
1k views

Open and redirect port

I'm trying to set up SNMP for a router so I can monitor it from an existing Nagios installation on an off-site server. I'm having trouble getting the router to respond to SNMP requests from the WAN, ...
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2answers
723 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 ...
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1answer
22 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 ...
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2answers
204 views

IPv6 in IPv4 over LAN

I want to setup IPv6 in my LAN, but also want to have some machine to use IPv4 only. How do I do such setup so that every machine can communicate with each other ? All machines supports dual-ip ...
1
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1answer
688 views

Network fail on FreeBSD: Ping to router fails, but router believes computer is connected

I have a TP-Link TL-WN851N wireless adapter, which is based on an Atheros device. When I attempt to connect to my WPA2 wireless network, ifconfig wlan0 tells me that the connection is 'associated'. My ...
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0answers
24 views

Arch Linux network issues [on hold]

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 ...
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0answers
61 views

VirtualBox network interface with custom CIDR and internet access

I have an OpenStack setup running on VirtualBox. The host OS is Ubuntu, and the guest OSes are all Ubuntu. I use 3 VirtualBox VMs to setup and install OpenStack. My OpenStack setup further spawns ...
0
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1answer
2k views

Consistent network interface name ubuntu using pci slot

One can set consistent interface naming via mac address by modifying /etc/udev/rules.d/70-persistent-net.rules. Can you establish consistent interface naming by PCI slot number? (I tried but failed) ...
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4answers
24k views

Yum update problems on CentOS 6.5 minimal as VMware guest

INFO: I am using Windows 7 Pro (64bit) with VMware Workstation version 10.0.1 . I am using CentOS(64bit) 6.5 minimal, for the first time. I am running this from my workplace network, which may use a ...
1
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1answer
11 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 ...
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0answers
21 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
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1answer
20 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 ...
12
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2answers
56k views

Sending messages to another user

Is there any command to send messages through the Linux shell to other people on the same network? I'm using write user and then write the message itself. But there's any command that doesn't show my ...
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0answers
22 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 ...
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1answer
9k views

Linux Centos 6: Restart Network Service after lost ping

My OS is Linux Centos 6. Restart Network Service after lost ping Basically, I need a watcher or a script that will detect no ping to/from another ip address and run service network restart after ...
0
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1answer
31 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, ...
4
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1answer
40 views

Wifi cuts out after some time

I recently installed Debian on my laptop (after playing around with dozens of distros in VMs for a year or so), and while most everything has gone quite swimmingly I'm having some issues with my wifi. ...
1
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3answers
5k 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 ...
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1answer
40 views

Make OpenVPN restart upon new network connection on systemd

How would you go about making OpenVPN automatically restart upon connecting to a network? The issue is that every time a network connection is lost, or if the computer is booted without a network ...
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2answers
20 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 ...
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0answers
26 views

VPN or anything similar to avoid Chinese Firewall [closed]

One of the worse days today. Can't open any website under 60sec, timeouts, downloads failed, pictures won't load. Currently I'm using a VPN (PPTP) provider with servers in US, NL, DE and UK - US ...
3
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6answers
16k views

hostapd will not start via “service” — but will start directly

I am having trouble getting hostapd to start as a service. It fails when I try to start it: $ sudo service hostapd start [FAIL] Starting advanced IEEE 802.11 management: hostapd failed! From what ...
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0answers
38 views

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

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 ...
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0answers
10 views

Fast & Traceable copy of 2 TB data over Gigabit LAN from Ubuntu live mounted Volume to Synology NAS (Win SMB, NFS, Mac AFP)? How? [closed]

Fast & Traceable copy of 2 TB data over Gigabit LAN from Ubuntu live mounted Volume to Synology NAS (Win SMB, NFS, Mac AFP)? How? I am going a Data Recovery using a Unbunto Live CD (14.x LTE) ...
1
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1answer
15 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 ...
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3answers
48 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 ...
0
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1answer
3k views

Linux Mint 17, Wifi Slow and Drops Connection, No Ethernet Connection

On a fresh install and updated Linux Mint 17 XFCE, the system cannot maintain an internet connection through wifi, and is unable to connect at all through ethernet. Wifi will work somewhat slowly for ...
0
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1answer
11 views

minidlna from one server not being spotted

I have minidlna set up on two servers on my subnet. One [serverA] is found by the other server [serverB] and the tv. The other [serverB] is not picked up by either other device. A quick check with ...
3
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1answer
2k 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 ...
0
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0answers
8 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 ...
4
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1answer
2k 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 ...
0
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1answer
24 views

Suddenly all connections are rejected [closed]

My system is Debian 8. Just now I was using ssh to connect to my laptop and programming. I swear i didn't even use sudo command, but all in a sudden, all connections are rejected. It seems that ...
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0answers
8 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
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1answer
23 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 ...
5
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1answer
3k views

Debian, two network cards - “no route to host” on eth1

I have added a secound nic in a debian box. That nic is ment for doing some test stuff, so those devices connected should just be able to access the debian box or be accessed from it. To set up the ...
1
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1answer
699 views

Is it possible to prevent eth0 network traffic from accessing eth1 network?

I am not really sure how this is possible but I have a linux(ubuntu 14.04) box with 2 interfaces. eth0 is connected to our lan 192.168.0.* and eth1 is connected to a dlink wifi router on network ...
0
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0answers
9 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: ...
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0answers
8 views
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0answers
13 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 ...
1
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1answer
54 views

What are possible reasons why iwconfig is not updating connection stats?

I use iwconfig to show me some information about my current internet connection like this $ iwconfig wlp2s0 IEEE 802.11abg ESSID:"eduroam" Mode:Managed Frequency:2.462 GHz Access ...
2
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1answer
36 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
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1answer
388 views

Frequent disconnections in OpenVPN

I'm suffering random disconnections with OpenVPN. I don't know much about the subject, maybe you can point me in the right direction? Here is the tail for /var/log/messages, it contains a <warn> ...
7
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3answers
3k views

How to know if a process is attached to a tap interface?

I sometimes come upon machine with tap interfaces (eg, when KVM is running). How can I know which process is attached to the TAP interface?
2
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1answer
70 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 ...
2
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2answers
210 views

reset Ethernet bonding without rebooting

I have the following Ethernet bonding configuration: old configuration: bond0 eth0 eth1 bond1 eth2 eth3 new configuration : bond0 eth0 eth2 bond1 eth1 eth3 I have made the ...
13
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2answers
7k views

Limit outgoing bandwidth on an specific interface

I would like to know the easiest way to limit outgoing bandwidth for an interface. I want to cap the outgoing port speed so that file transfers between my servers don't fail during busy hours. What's ...
0
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1answer
17 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: ...