Managing and using network connectivity on a unix system

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In general should Linux “ping” be faster than Windows “hrping”?

I'm using HP DL360p Gen8. I've installed dual-boot Windows Server 2008 R2 and RHEL7. In both systems I configured LACP and VLANs. So this is same server, same hardware, same network, same route tables ...
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168 views

Setting up a wireless connection on CentOS 6.5 without NetworkManager

I'm trying to set up a wifi connection from my CentOS 6.5 system to a wireless AP, without using NetworkManager. This is a fresh installation, but yet I don't see any ifcfg-* files in ...
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1answer
43 views

sMail server cannot get connect by Linux frequently

I have a mail server A build by iredmail on Centos6.5 system. The mail server have a public ip aaa. There are about 40~50 mail clients which operating system is windows in local network, they all ...
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1answer
531 views

How to make NIC team come up on boot in RHEL 7

To configure networking on RHEL 7, I created a JSON file for teaming, then ran these commands: ip link set down eno1 ip link set down eno2 ip link set down eno3 ip link set down eno4 teamd -g -f ...
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1answer
50 views

Is there an /etc/network/interfaces option like wireless-ap except for a wpa-ssid/wpa-psk connection?

In /etc/network/interfaces (on Debian Linux 7.6 with wpa_supplicant), wireless-ap forces a specific access point for wireless-essid connections. Is there an equivalent option for wpa-ssid/wpa-psk ...
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51 views

Centos List connected computers/devices on network

I'm running on a CentOS and I would like to check to see what computers/devices are connected to my network. How would I be able to do that. I've tried nmap but I must have used it in the wrong order ...
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8 views

Appletalk access to root

I am using netatalk 2.2.2-1 on my Raspberry Pi (running Raspbian) to allow access from my Mac. This has been working well for my Home directory, but I have tried to get access to the Pi root without ...
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1answer
40 views

How to view a program's internet connection

In Linux, I would like to be able to determine whether a given program is connected to a remote server and is transmitting/receiving data. I'd also like to see which IP address or URL the program is ...
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101 views

How to configure teaming in RHEL 7?

I've used RedHat documentation to configure LACP on my server. Now I see "Connecting" on the Team just created: why "team0" is mentioned twice in the list? Why is it "Connecting", not "Connected? ...
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2answers
64 views

How to find out how many TCP retransmits are occurring?

I am running Debian Wheezy on an ARMHF platform and do most of the communications over fairly unreliable cell phone networks. Is there a way to read the no. of re-transmits the TCP stack has done ...
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76 views

Is there an ICMP echo request service?

Often, in applications that I develop, I like to include a network status indicator for various devices on the network. The easiest way to monitor these devices is by pinging them. But ICMP echoes are ...
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1answer
36 views

How to monitor network connectivity between the ports in different windows server? [closed]

I have a application hosted from one server which listens on to a specific port and listens to a service on a another server in a different port . Seeing error log between XYZ application hosted on ...
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1answer
186 views

IP Address not populating in eth0 in ifconfig

One of my servers at work does not connect back to us (so I can't SSH into it). I asked the person on the site to do numerous things: sudo /sbin/service network restart It comes up with this: I ...
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1answer
169 views

what do the numbers mean in ip rule show command

If I type ip rule show command in my machine, I get the output as, 0: from all lookup local 32766: from all lookup main 32767: from all lookup default What do the numbers 0,32766 and 32767 ...
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84 views

forward virtual interface network in KVM guest to the physical interface in the host machine

I am trying to experiment with Linux IP routes. This is what I have so far. I have a host machine whose network details are as below. wlan0 inet addr:192.168.1.9 Bcast:192.168.1.255 ...
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56 views

nmap won't recognize a hostname on my local area network

Scanning the machine on the LAN with my laptop, I got this: gabriele @ osiris { ~ } [ Tue Oct 07 ] [ 08:49 PM] nmap -sP 192.168.1.236 Starting Nmap 6.40 ( http://nmap.org ) at 2014-10-07 20:50 CEST ...
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4answers
386 views

How to find IP address of device connected on the same network as PC based on MAC id

A PC and embedded Linux device is connected on the same local network.(We don't have DHCP server access, IT admin has the access). We also don't have access to debug UART on the embedded Linux board. ...
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1answer
39 views

w command for the other network hosts

While the who command refers to the local machine, rwho shows the same informations about all the known hosts of the local network. Similarly, w shows informations about the users on the local ...
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25 views

How can I connect my REMnux to wifi

I have a copy of Linux REMnux 5 which is specially designed for Reverse Engineering. It is based Linux Ubuntu. But I don't know how to connect it to a wifi connection or even a wired connection.
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2answers
106 views

setup the guest network in KVM to interact with the outside world (google.com )

I am trying to better understand the network setup in my machine. Host Machine Setup I have a wireless interface (wlan0) on my host machine which has the IP address as 192.168.1.9. The default ...
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1answer
75 views

Tons of unknown connections in nethogs

I am seeing hundreds of different connections to the same ip and port scrolling by when running nethogs. Occasionally the foreign IP and port will change (not always 80, but sometimes). I've noticed ...
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2answers
519 views

Identical MAC address on two different VM, yet I have internet connectivity

I have set up a network as such: Set up host-only networking on VirtualBox. The first adapter is configured with NAT, the second with host-only networking HOST: Windows GUEST: CentOS VM1, CentOS VM2 ...
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1answer
46 views

Allow non-root user go get network traffic statistics

I know that I can use cat /sys/class/net/eth0/statistics/rx_bytes to see the amount of received bytes. Sadly I only can run this command as root. When I am another user, I get cat: ...
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1answer
247 views

setup kvm on a wireless interface on a laptop machine

I am trying to setup KVM in ubuntu 14.04 host machine. I use a wireless interface to access the internet in my machine. I have setup the wireless interface in my /etc/networks/interfaces as below. ...
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27 views

Kernel routing table destroyed

I have a server that I have virtualized, and as of yesterday, it started acting weird. I couldn't SSH into it, but when I tried SSHing into it from another server on the rack, it worked fine. DNS ...
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15 views

olsr not communicating in two hops

I was trying to set mesh network using olsr protocol. I installed olsrd daemon and is working fine. node1 ------------node2-------------ode3 (olsrd) adhoc (olsrd) adhoc ...
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2answers
93 views

how can I create a KVM guest 100% as a non root user?

In a debian host with many users, I want to allow different users to create their own VMs, completely independent of each other. The closest relevant (non-root) way I have seen in guides is by ...
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2answers
70 views

Test connectivity of a Interface

I have a raspberry Pi with three interfaces eth0 (Ethernet), wlan0 (WiFi), and wwan0 (via a GSM modem) How can I test if an Internet connection is available via a certain interface? e.g. is my ...
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1answer
41 views

Where did pand go?

Most guides on setting up a Bluetooth access point use a program named "pand" to do so. Seemingly, this program was dropped in bluez5. How can PAN be set up without it?
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1answer
127 views

“nmcli nm wifi on” stops hostapd

I have ubuntu 14.04 installed on a computer with a built-in wifi and also a usb wifi. I want to run hostapd on built-in wifi to act as an access point though no connection will be established with it. ...
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1answer
74 views

Cacti/rrdtool error -> Poller[0] ERROR: SQL Row Failed!, Error:'1033'

I have cacti working flawlessly on a centos 7.0 machine but I need it working on a centos 6.3 machine. I download the same version of cacti as what is on the 7.0 and I installed rrdtool from yum. ...
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1answer
73 views

pppoeconf login problem

I used pppoeconf command for setup a pppoe connection over the wireless in xubuntu 14.4 and follow all the steps based on ubuntu pppoe wiki but after run pon dsl-provider i cant connect to internet it ...
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1answer
36 views

Does the NICs have any kind of log?

Recently I had an issue with my server, my nagios couldn't ping it and lost connection with the NRPE daemon, in my host provider interface I could see the server was ACTIVE but either I couldn't ping ...
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1answer
211 views

Restart network interface - Angstrom linux

I have an embedded PC running Angstrom Linux. When the network is unavailable during the boot, it won't become available when I for example connect it to a network afterwards. When I reboot the device ...
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31 views

Set source address for incoming packets on a server

I'm developing a UDP reverse proxy for a game server, and so far, everything has gone fine except for one thing - getting the backend server to submit requests to the master server list (run by a 3rd ...
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79 views

SSH server doesn't respond for a while, then opens up briefly after port scanning

On my local machine I try to ssh into my server but it gives me connection refused. Doing an Nmap of my server tells me there are no open ports. pinging the machine works. What I've done so far is ...
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1answer
59 views

Static networking between CentOS and Windows Server 2008

I am trying to set up static networking between my Linux VM and Windows Server 2008 VM. One thing I am confused about is that currently the Linux box only displays an eth0 adapter when I type ifconfig ...
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297 views

Using OpenConnect for a VPN, Linux Mint 17

I'm trying to setup a VPN connection. My corporate IT team went and hid under a table when I said Linux so you guys are my last hope. I'm trying to port all my the settings from my Windows 7 machine ...
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46 views

SNAT with firewall-cmd?

I have an interface with multiple IP Addresses (on CentOS 7), which is in zone "external" (with masquerade on). I want to specify that, if a connectiona attempt to a specific address goes out, to use ...
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2answers
70 views

Browsers doesn't see an aliases in /etc/hosts

A firm where I'm working uses an internal site with documentation and etc. where all references made e.g. to «srv-moss» — this names should be defined in hosts file, where I did added it. It works ...
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144 views

How to mitigate error “kernel: nf_conntrack: table full, dropping packet”

We recently had a problem with one of our servers (Debian Squeeze) becoming unresponsive during heavy-ish load. Looking at the kernel logs, I think this is the cause: kernel: nf_conntrack: table ...
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202 views

how to enable wireless connection in linux mint 17

I have Dell Inspiron 2200 with "Broadcom 4318" The wifi worked fine with "Linux Lite". It still works with the ethernet connection. But NO wifi! The "Driver Manager" shows blank ("NO proprietary ...
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105 views

How to forward Remote-Desktop Port across interfaces using ufw?

Machine A has two network interfaces: Network eth0: 10.10.20.0/24 Network wlan0: 192.168.1.145/24 Machine A has 192.168.1.145 as Default Gateway, and also a route to pass 172.16.0.0/16 to ...
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24 views

How to set proxy with a config file provided in freebsd

I'm currently trying to update and install packages and other things on a FreeBSD server, but I’m blocked by my proxy. I'm in an university, and there are a few proxies before to go on the internet. ...
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2answers
402 views

ping: unknown host with iptables enabled

I can't ping www.google.com. However I can ping the IP address: ping 74.125.237.142 At first, I thought it is a problem with my DNS settings. But I checked my resolv.conf, hosts, and hostname ...
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2answers
186 views

no internet connection for a kvm guest. what could be wrong?

I have setup a kvm win7 guest on a debian host. It's been up and running for a while now, but I had not done much with it. What I had done (for sure) was to download putty. Today I wanted to try and ...
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1answer
46 views

Binding to not existing interface

I've just noticed the very weird situation I don't have a good explanation for. The machine (debian) has one interface with one IP address assigned: # ifconfig vmbr0 |grep inet inet ...
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23 views

SoftEther Logging

I've installed SoftEther on Centos 6.5 and can't seem to get users to connect. Anyone know if there is a way to increase the verbosity of the logging? Regards
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28 views

Set up a VPN network between servers

I'm looking to set up a VPN network between a few servers. However, my needs are a bit unconventional - I need to have the VPN clients grouped into 2 groups: masters, and clients. (Both master and ...
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3answers
97 views

How to get the original MAC address of a network card, after the OS modified it?

How can I find out the original MAC address for a network card, after it was modified by the OS? dmesg doesn't provide it, and the logs in /var/log too, and dmidecode doesn't provide it too and ...