Managing and using network connectivity on a unix system

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8 views

Allow multicast packages from the bridge to wire in KVM

On a CentOS 6.5 host, I have a couple of guests - Ubuntu 12.04 and CentOS 6.5. The Ubuntu guest is generating mcast traffic that is visible via a tcpdump on the br3 interface. It is also visible on ...
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1answer
30 views

Getting all IPs of devices connected to the same router

I have several linux devices connected to the same router (of which I am not a administrator). How can I find out the ip addresses of all other devices by executing some commands in one of them?
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0answers
22 views

Create virtual network adapter with own MAC and IP?

I have a server with 4 different IPs over one real NIC. Now i try to setup different virtual network adapter in debian with this IPs. The Problem is, that each IP needs also a specific MAC. Otherwise ...
0
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1answer
22 views

Isolate subnets on the same interface

I need to isolate Subnets on a linux machine CentOS that act as gateway. I have the following scenario. CentOS eth0 pub ip addres eth0.1 192.168.1.1 eth0.2 192.168.2.1 Now eth0.1 and eth0.2 can ...
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2answers
57 views

How to check programatically if the Ethernet cable is plugged in?

As you know, in Windows, when we plug in the network cable, the network symbol will change to another status. How can I know whether the cable is plugged in or not via the command prompt in Linux?
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57 views

TCPDump To Capture A Tracepath6 Datagram

I'm trying to use TCPDump to capture an IPv6 datagram using: tcpdump -c 1 -i eth1 -vvvs0 ip6 and dst host H2.net2 & tracepath6 H2.net2 I'm running this script on H1.net1; R12.net1 is the ...
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2answers
17 views

net cat client and server model

I tried to make server client model as below on one shell nc -l -p 8080 this works as a server and on another nc 127.0.0.1 8080 and this works as a client all of this is fine ... the ...
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0answers
22 views

How to connect linux 3.6 ( iceweasel) to a wireless network [on hold]

Please explain how to connect a laptop running linux 3.6 to a wifi network. The name of the network manager is wicd 1.7. The router name is beachone, with an ip address of 192.168.0.The wireless ...
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0answers
19 views

NAT-T set up using 3 linux machines

I am trying to have a simple NAT-T setup using 3 linux machines. Linux1 Linux2(NATdevice) Linux3 (eth0) 192.168.1.51 <--->(eth1)192.168.1.80 & ...
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0answers
7 views

FreeBSD 10: CARP & LAGG interface incorrectly chooses state

I'm having an issue with my CARP configuration on a pair of FreeBSD 10 servers acting as NAS units. I'm using CARP so that the servers share a virtual IP with the goal of making failover somewhat ...
1
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0answers
40 views

How to populate /etc/network/interfaces automatically

I am trying to populate /etc/network/interfaces with a dhcp config for all interfaces at the first system boot (Debian 7.6 server). I modified the script in : /lib/udev/write_net_rules by adding: ...
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21 views

Why on my Linux PPPoE connection displays sometimes authentication failure?

Here is my log: Oct 18 09:51:52 -desktop pppd[2764]: Plugin rp-pppoe.so loaded. Oct 18 09:51:52 -desktop pppd[2766]: pppd 2.4.5 started by root, uid 0 Oct 18 09:51:52 -desktop pppd[2766]: PPP session ...
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0answers
17 views

I'm trying to create a public TLD using BIND

I'm using these two guides: jackal777.wordpress.com/2013/11/19/custom-tld-for-local-network/ timg.ws/2008/07/31/how-to-run-your-own-top-level-domain/ When I run dig sokolovskaya.ssu, it looks ...
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0answers
25 views

Routing incoming source IP traffic to a loopback IP issue

I'm wanting to accomplish the following: I have a BIND DNS server setup where it is listening on ANY address and also listening in a BIND config ACL on 127.0.1.1. If there is another way where you ...
4
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2answers
144 views

Why is ping much faster when using -f

I'm pinging the same host from the same machine at the same time. And when using -f, the result is almost twice as good: [root@localhost Desktop]# ping 196.1.6.16 PING 196.1.6.16 (196.1.6.16) 56(84) ...
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21 views

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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0answers
28 views

port forwarding using Netcat [closed]

I have used Netcat for accessing shell and files. But I could not find any tutorial or script for port forwarding using Netcat. I want to use port forwarding script in my android phone. Please guide ...
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0answers
28 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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0answers
19 views

strange network hangs [closed]

I have a linux home server. It is a Asrock ION330, with Nvidia Chipset, running Ubuntu 14.04 LTS I has been working flawlessly during years, but since June it has been suffering some kind of strange ...
0
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1answer
19 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 ...
0
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1answer
91 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 ...
1
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1answer
21 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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0answers
19 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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0answers
6 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 ...
0
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1answer
33 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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0answers
31 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? ...
2
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2answers
37 views

Linux : 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 ...
5
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0answers
52 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 ...
0
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1answer
17 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
56 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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0answers
8 views

A question in ip_append_data [migrated]

I am confused with ip_append_data in linux network protocol stack when I see those codes: if (!(rt->u.dst.dev->features&NETIF_F_SG)) { unsigned int off; off = ...
2
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1answer
38 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 ...
2
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0answers
39 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 ...
0
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1answer
36 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 ...
1
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4answers
110 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. ...
2
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1answer
36 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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0answers
17 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.
2
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2answers
75 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 ...
3
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0answers
50 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 ...
7
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2answers
346 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 ...
1
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1answer
27 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: ...
4
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1answer
73 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. ...
0
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0answers
22 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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0answers
12 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
31 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 ...
2
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2answers
38 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 ...
1
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1answer
27 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
45 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. ...
1
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1answer
34 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. ...
0
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1answer
44 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 ...