Managing and using network connectivity on a unix system

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yum + how to know to which site yum download the packages? [duplicate]

when I am installing rpm by yum (VIA Red Hat Network) as the following example down how to know to which site (URL ADDRESS) yum refer to? for example https://rhn.redhat.com or https://...
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teamviewer has network connection problem in red hat

I`m new in Linux, and I want to install Teamviewer for remote control. I installed it today, but the connection does not work, it could not connect to the server. I wonder whether its connection was ...
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36 views

Systemd networking service fails because of unknown interface

My problem is related to USB tethering and network interfaces. When I run ifconfig -a, normally I see 3 interfaces - loopback, WiFi and Ethernet. I have defined gateway, netmask and broadcast for ...
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2answers
33 views

check ip address of a linux server to upload the file [duplicate]

I am working on a linux server remotely. Are there any command that can allow me to figure out the IP address of this linux server, so that I can ftp some files to this server.
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Problem in Virtualbox Guest addition ip address?

I'm using Ubuntu 14.04 as a host and running Windows XP on virtual box machine and When I'm checking for its ip address using ipconfig then it's showing in form of 10.0.x.x and I want to use it as ...
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Are source IPs included in Linux's Ephemeral Port Uniqueness?

From http://aleccolocco.blogspot.com/2008/11/ephemeral-ports-problem-and-solution.html (2008) Linux shares the assigned list of ephemeral ports across all local IPs for unconnected sockets. ...
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44 views

Is IP over USB 3.1 type-C between two Linux hosts at 10Gbps possible?

I've been unable to determine on my own if I can do this. I'm wondering if it is possible to connect two Linux systems with USB 3.1 with type-C connectors to setup a point to point network (IP or ...
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1answer
46 views

Rotate IP outbound IP address in Ubuntu or CentOS

My OpenVZ VPS has two IPv4 and two IPv6 addresses: 23.54.xx.102 23.54.xx.103 2604:xxxx:1::xxxx:6x0b 2604:xxxx:1::xxxx:5x7c Now I want to rotate my outbound IP so that when I run any PHP, ruby or ...
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1answer
29 views

How to test linux NAPI feature?

I am trying to test the NAPI functionalities on embedded linux environment. I used 'pktgen' to generate the large number of packets and tried to verify the interrupt count of my network interface at /...
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1answer
26 views

prompt for network setup during kickstart installation centos7

I am trying to set the ip manually during kickstart installation using centos 7. During the installation it has to prompt for the network setup. I tried using the below configuration : network --...
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Network teaming or bonding in Ubuntu 12.04

I have two NIC cards and two ISP providers. If one network is down, how can I automatically switch to other network which is up. I am using Ubuntu 12.04, is it possible?
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Ubuntu 14.04 server can't access local or external network from server

I have Ubuntu 14.04 development server that was upgraded from 12.04 a few months ago. It initially worked fine, but suddenly lost network capability. After some messing around and removing DHCP (set ...
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25 views

What would be the IP if not mentioned in hostfile

If I ping the host say ABC and there isn't any host to IP mappings mentioned in the /etc/host file then what IP will it take? P.S- The host that I am pinging belongs to an internal network.
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1answer
13 views

interface bonding OpenSuse 10.2

Thanks for taking a look... I have a very old active OS, unfortunatly due to supplier issues I cannot upgrade to a newer version but I need to get Interface bonding active. The OS is OpenSUSE 10.2 ...
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1answer
53 views

Apache web server and virtual host can not be accessed from other Ubuntu PC in LAN [closed]

From server PC (same PC), I am able to access Apache web server using the URL http://192.168.0.21 and virtual host 50000SiteName using the URL http://192.168.0.21/50000SiteName. But I am not able to ...
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1answer
39 views

How to configure internet on old linux VM

I have downloaded the first version of Mendrake running kernel 2.0.35 for study purposes. I installed the system on a virtual machine (VirtualBox), i used SCSI virtual hard drive for compatibility &...
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eth0 NO-CARRIER on Arch/Wired Connection Not Working

The device is a DELL Vostro 1510 and I have tried both the r8169 and r8168 kernel modules. ethtool eth0 shows Auto-negotiation: on MDI-X: Unknown and Link Detected: No. Ip link shows <NO-CARRIER,...
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1answer
40 views

Where to find SSL private key on a CentOS server

I am running a server on CentOS, and I would like to decrypt and view the SSL traffic. However, I cannot locate any of the keys necessary to do this. My /etc/pki/CA/private folder is empty, and my /...
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0answers
36 views

VPN server into systemd-nspawn machine

I am trying to deploy a VPN server (I choose Openswan flavor) into a systemd-nspawn container on a raspberry pi running Arch Linux. For now I can login into the container, ping, goes outside from ...
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50 views

Why my CentOS7 system can't resolve domain names any more?

Yesterday , I disabled NetworkManager on my CentOS7, to get static IP when it starts. Today , I found that I can't ping to websites any more ,because it shows unknown host www.xxxx.com to any www.xxxx....
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1answer
30 views

change IP address

I tried to change my private IP address with the following commands: sudo ifconfig wlp3s0 down sudo ifconfig wlp3s0 192.168.1.12 sudo ifconfig wlp3s0 up They just work fine becouse the IP changes ...
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11 views

Connected UPnP clients on LAN network

I want to implement a home LAN network, which shares media and files using UPnP. On my router, which runs openWRT based Linux OS, I've added a miniupnpd to act as a server, and all other clients on ...
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25 views

Let ifconfig wait for IPv6-address to not be tentative

I claim an IPv6 address using ifconfig in a script. This address is then immediately used to listen on a TCP port. When I write the script like this, it fails because the service is unable to listen: ...
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Configure vpn and non-vpn proxy or how to let application bypass a vpn

I have icedove configured with a gmail account amongst others. However everytime I use or change a vpn, google complains and icedove can't receive the gmail emails. The process to fix this is rather ...
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1answer
79 views

Not getting a static IP for CentOS 7 [duplicate]

I'm not sure what I am missing to have my static IP?? Here are my network configuration files: /etc/hosts: 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 ...
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1answer
24 views

what is difference between tap interface and normal interface?

I'm studying about virtual networking. I saw the youtube video that makes tap interfaces and adds them to Open Virtual Switch. From here, I don't know what tap interfaces are. What's different ...
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2answers
78 views

Change MAC address of network interface on lower level

I know that I can change a network interface's MAC address by bringing the interface down, using a command like ifconfig eth0 hw ether 00:11:22:33:44:55 or ip link set eth0 address 00:11:22:33:44:55 ...
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1answer
35 views

Using netcat for port forwarding

I have a process that listens on an IP:port - in fact it is spark streaming which connects to a socket. The issue is that I wish to somehow create a server that connects to spark on one port and data ...
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1answer
26 views

Learn the base of security and defend myself from external attack [closed]

i would like to learn and work on internet security, because thia is a world that is in continuos change and id like to improve myself on it..anyone can help me linking site or PDF where i can study ...
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56 views

tcpdump: Couldn't find user 'pcap'

I am using RHEL 5.4, tcpdump is already installed also there is a user pcap but I am getting following message. [root@localhost ~]# tcpdump tcpdump: Couldn't find user 'pcap' [root@localhost ~]# ...
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2answers
88 views

Can not ping other nodes in private network

I am setting up a small cluster (four nodes running ubuntu14) and I have this configuration: # Internet and lab - 192.168.10.0/24 iface eth0 inet dhcp dns-nameservers 192.168.100.1 # privte network ...
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1answer
19 views

Debian : Monitoring if server is offline

We have a dedicated Debian X64 server, running projects and we require availability under any situation. Since last 2 days we have noticed that the server went offline for 10-15 minutes, and then it ...
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how do I make a SIP phone ring with sipsak?

How can I use sipsak to simulate a call so that there's an actual ring, or possibly even a sound is played? thufir@mordor:~$ thufir@mordor:~$ sudo sipsak -v --usrloc-mode --from sip:demo_alice@...
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Block port on boot2docker vm on virtualmachine

I have Boot2Docker image running in VirtualBox on my mac. I use Kitematic to run docker on my Mac. I have activemq docker running, on port 32769 in boot2docker vm. I have application running which ...
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37 views

USB wireless dongle detected by usb but interface does not come up

I have a wireless dongle based on the RTL8192EU chipset, but there doesn't seem to be any module loaded for it. This is the dmesg output when I plug it in: [ 404.321566] usb 1-1.3: new high-speed ...
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1answer
34 views

How to set a routing table that prefers wlan dhcp interface as default route

eth0 has a static IP set in /etc/interfaces wlan0 gets it IP dynamically How can I change my routing table and where would I put the command to always make wlan0 the default route so internet access ...
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Internet Is Connected But Not Working On Lenovo g580

I installed BackBox 4.6 from https://backbox.org/, but I have no internet access. I am connected via an ethernet cable but I still have no internet. I tried ping but it's not working and no webpages ...
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1answer
32 views

Routing to the localhost, how does it work?

The output of /sbin/route -n on my Linux box doesn't mention the 127.x.x.x address range, neither it mentions lo interface. Nevertheless ping localhost and ssh localhost are working fine. How the ...
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1answer
47 views

routing between linux namespaces

I have the following network topology using linux namespaces: .--------.veth0 .--------.veth2 .--------. | ns_snd |------------| ns_mid |------------| ns_rcv | '--------' veth1'-----...
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How can I use sipsak to send a SIP Invite to lrnlookup.telnyx.com with sipsak?

Here's what I have so far: thufir@mordor:~$ sipsak --from sip:thufir@getonsip.com --password flFl24GB5 --invite-mode lrnlookup.telnyx.com --message-mode error: for the USRLOC mode you have to give a ...
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1answer
39 views

Large TCP backlog for uwsgi, but no visible connections

In a setup with three docker instances, one running haproxy and two others running a flask-based python application through uWsgi, we run into a situation after about a day where no new connections is ...
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2answers
44 views

Poor network performance between AIX 7.1 on 1 Gbit/s and SLES 11 on 10 Gbit/s [closed]

I am having problems with the network performance between SLES and AIX. I have tested the network performance from AIX 1 Gbit/s to AIX 1 Gbit/s SLES 11 10 Gbit/s to SLES 11 10 Gbit/s AIX 1 Gbit/s to ...
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0answers
20 views

Bluetooth Tethering, no IPv4 adresse at interface bnep0

I want to tether my mobile internet from my smartphone (OnePlus One, Android) to my Laptop (Debian 8). I want achieve this without using external tools. At the arch wiki page (https://wiki.archlinux....
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2answers
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Can not set static DNS on debian

I'm using Debian jessie and I don't have network-manager or resolvconf installed and I'm using DHCP. DHCP with static DNS First of all I tried editing: /etc/network/interfaces And adding this: ...
3
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1answer
124 views

Linux router - Throughput speed of clients

I have a computer that is configured as a router with two NIC's, one is connected to Internet, the other is connected to the local network switch. I know that I can get the current throughput of NIC'...
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1answer
28 views

Use same IP for 2 Ethernet Adapters in different Physical networks

We have a Linux Panel with 2 Network Interfaces. On this Panel runs a software wich needs to comunicate to our devices in our network, and needs to be accessible from the customers network. One ...
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25 views

ethtool flow control icmp

I'm trying to disable ICMP directly on network cards. I have IXGBE driver 4.4.6 and ethtool 4.5 I've successfully filtered udp4 trafic with : ethtool --config-ntuple eth2 flow-type udp4 action -1 ...
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3answers
50 views

Lost in the world of VPN

The Q. If i have a server, is it possible to have that server with a VPN connection, while simultaneously having an entirely separate connection to be able to SSH to from client machine. The Why. I ...
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How to run a function for a specific received packet? [duplicate]

I am doing an experiment for my master thesis. I want to run a function (e.g. multiply two numbers) when a specific packet is received (e.g. a packet with destination TCP port 6666). For example, I ...
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41 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 ...