the IP protocol and IP addresses

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Could two servers connected by one cable use the link in the same time?

I'd like to know if two servers connected through a cable, can use the only connection to communicate in the same time. For example suppose both have are ssh servers, could I log in from A into B and ...
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1answer
87 views

Check IP is in Range of Whitelist Array

#!/bin/bash MAXCDN_ARRAY="108.161.176.0/20 94.46.144.0/20 146.88.128.0/20 198.232.124.0/22 23.111.8.0/22 217.22.28.0/22 64.125.76.64/27 64.125.76.96/27 64.125.78.96/27 64.125.78.192/27 64.125.78.224/...
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1answer
22 views

When enter http://my_server_IP_address don't see Apache HTTP server default page

I just launch a VPS instance use CentOS 7 x64. I follow this tutorial for installing Apache HTTP Server sudo yum install httpd sudo systemctl start httpd.service but when I use my browser (at ...
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25 views

'ip netns exec' command execution using nsid obtained from 'ip netns list-id'

I have previously used ip netns exec command to modify netns interfaces. But if there is no name associated with a netns (eg: docker), how can I use nsid result of ip netns list-id command for ...
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1answer
3k views

Change remote host IP address without losing control (Linux)

How can I change a remote host primary IP address without getting disconnected at all (without being in a "no IP addr" state). The matter is poorly discussed on Internet (according to my research). ...
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1answer
302 views

noip2 can't update my IP address correctly after computer reboot

I want to set up a server with using no-ip DDNS service. I follow this guide, but it can't update my IP address after reboot the following message is command # noip2 -S 1 noip2 process active. ...
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31 views

ip link up with empty line

case: # eth0.cfg The primary network interface auto eth0 iface eth0 inet static address IP-1 netmask 255.255.255.255 broadcast IP-1 post-up ip addr add 192.168.100.254/24 dev ...
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2answers
4k views

How to know ip camera address

I have ip camera with static ip address preset. How can I know it ip using linux? I connect camera direct to my notebook. My system is Linux machine 3.5.7-gentoo #2 SMP ifconfig eth0 eth0: ...
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33 views

How to firewall qemu/kvm guest in host machine?

I have a qemu guest with following network topology: Internet <-> eth1.96[bridge]tap96 <-> eth0[guest] I need to allow access to guest machine only from one specific /24 network and I ...
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1answer
46 views

sendmsg: Network is unreachable

I set the IP address of my network card to a particular value to be able to talk to a piece of hardware. Then I try to ping it, which works for a few seconds, until I get the error ping: sendmsg: ...
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1answer
66 views

Setting static ip address for multiple ethernet controller

I have a simple question for which I couldn't find a answer for hours on the internet. I didn't think it's so much special what I want to do, but it seems to be. I have Debian virtual machine within ...
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1answer
35 views

linux + how to monitor dropping from ifconfig or ip

How to monitor RX dropped packets in Linux 7 with tcpdump ? Or maybe any other way? And what is RX dropped? ifconfig results on eth1: # ifconfig -a | grep RX | grep dropped RX errors 0 ...
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1answer
69 views

Access from unknown IP tracks to non-existent website

Just had a warning that my Gmail's been accessed from the following IP: 151.230.107.114 which routes to something called htc_frisbee.com , which doesn't appear to be a real website. Could this just be ...
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1answer
50 views

How can I grant permission to a user to change the IP address?

I need the user be able to change the IP address, without giving him full super user access. How can I do that? I tried the solution here http://serverfault.com/a/480823 That works fine, but only ...
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41 views

Unable to connect to wifi “IPv6: ADDRCONF(NETDEV_UP”

When I click on the wifi icon and the hotspot I want to connect to, nothing happens. Nothing at all. And here's my dmesg: [ 9647.582070] IPv6: ADDRCONF(NETDEV_UP): wlp4s0: link is not ready [ 9957....
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1answer
59 views

“legal” ARP poisoning by machine aggregating 2 NICs crashes us

I'm really not sure if that title makes any sense so apologies for that, but strange things are afoot, threats are being made and we need to sort this problem out; The situation: Our device (a ...
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2answers
127 views

How to set static IP with fallback to DHCP

On /etc/network/interfaces (Raspbian), is it possible to set a static IP with optional fallback to DHCP? That can be handy in case the configured static IP is already taken. Or it could be in a ...
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1answer
190 views

Routing Problem with IP Forwarding on Ubuntu 14.04 and VirtualBox

I'm not entirely sure how to best title this question as the set up is a little complicated... but basically I have a routing problem with IP forwarding on my ubuntu server. On my ubuntu server (an ...
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1answer
41 views

I am stuck connecting to the internet via a usb wifi stick

I am trying to set up a an internet connection through a usb wifi sticker in Linux. Here's the sequence I tried: iw dev This returns the name(?) of the Interface that I want to connect to: phy#0 ...
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1answer
28 views

Execute command with specific routing (ip/iptables)?

I saw great solution for binding application based on some routing table alias... not sure now what it was, but for sure with ip, route or iptables tools... anybody knows the procedure? What was the ...
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3answers
26k views

How can I block a range of IP addresses with an Amazon EC2 instance?

I know a certain range of IP addresses are causing problem with my server, 172.64.*.* what is the best way to block access to my Amazon EC2 instance? Is there a way to do this using security groups or ...
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1answer
91 views

Forward ALL incoming HTTP requests to one of two servers based on subdomain?

I have two Debian Jessie servers. One is my home server that I use for personal/hobby stuff, the other is my development server for work. For arguments sake lets say... Personal: 1.1.1.1 ...
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1answer
2k views

SUSE Linux 12 - configuring IP alias

I want to setup an IP address alias on a network card. I created a file /etc/sysconfig/network/ifcfg-ens160 and its contents are: BOOTPROTO='static' STARTMODE='onboot' IPADDR='192.168.0.113' NETMASK='...
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345 views

Why cannot I ping 192.168.10.1, the default gateway, from an Ubuntu Linux 15.10 computer but I can do so from Windows 7?

I cannot ping 192.168.10.1, the default gateway, from the Ubuntu Linux 15.10 computer, 192.168.10.22. But I can ping 192.168.10.1, the default gateway, from the Windows 7 computer, 192.168.10.15. ...
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74 views

Is it possible to redirect a local port to a LAN port?

I'm using a Flask application with virtual environment. When I start the server, I can access it locally via the IP 127.0.0.1:5000, but I'd like to make it accessible on my WLAN (pointing at 10.0.0.1:...
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1answer
317 views

Docker container doesn't expose ports when --net=host is mentioned in the docker run command

I have a CentOS docker container on CentOS docker host. When I use this command to run the docker image docker run -d --net=host -p 8777:8777 ceilometer:1.x the docker container get host's IP but ...
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5answers
61k views

How to remove all default gateways

I'm running a custom built linux machine, so not all linux commands are available. I execute network related commands, so I need to set a default gateway right before I run my command, then remove ...
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83 views

How to set kali linux IP Address Networking issue

I need your help regarding one small confusion. I have installed kali linux directly on desktop hard disk. i have also installed VirtualBox running vulnerable vm's inside kali linux OS with a network ...
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1answer
2k views

Set a local static IP address on a network interface and have it permanent even after restart

I have openSUSE 13.2. My laptop connects to the internet through a WiFi network but I have an embedded device which I need to connect to it through the ethernet interface. It has an IP address of 192....
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44 views

Centos 6.x multi-homed routing question

I have a conundrum and would like to hear any pointers (been working on this for 2 days now, and need to get this server in to production). My "google-foo" has not been strong with this one....
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383 views

Bond two Internet connection of varying quality

I live in a remote part of the country, internet-wise. I utilize a satellite based internet, but it's having many problems during peak traffic times. I have researched a bit and found Ubuntu Bonding....
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2answers
172 views

Multiple machines on single network with same IP

I have a raspberry pi 2 that I'm using for a KODI media center that has the ip address 10.0.0.4. Another pi I just got is showing the same ip (derived from /sbin/ifconfig -a and listed under wlan0 for ...
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2answers
396 views

What is stopping our UDP packets (how does it know the route is down)?

We have a server (camera) sending RTSP video packets via UDP. At a customer site it travels over several hops, one of which may be an unreliable WiFi link that drops the odd packet or five. Usually ...
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3answers
135 views

get IP address who modified a file

I am looking a way to to get the history of a file, like the modification date, who modified this file (ip address or username), the changed lines Is there a way to get the IP address or username of ...
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1answer
40 views

ssh_config: Add a host section that matches IPs even when connecting via hostname

I want a host section in my ssh config that matches any local IP: Host 10.* 192.168.*.* 172.31.* 172.30.* 172.2?.* 172.1?.* setting setting ... This works as long as I connect directly to a ...
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19 views

How do I properly configure networking for a KVM virtual machine?

I have a remote dedicated server on which I have installed KVM. When trying to create my first virtual machine I am unable to ssh to the machine. I assumed that I needed another ip address so I ...
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1answer
87 views

how can one manually assign a permanent / static IP address with “ip addr add”?

After an IP address is assigned to this network interface, with any of the the following commands: ip addr add 10.0.0.0 dev eth1 valid_lft forever preferred_lft forever ip addr replace 10.0.0.0 dev ...
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1answer
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Correct syntax for nmap [closed]

I am trying to use nmaps os fingerprint or what ever the hell it is called.. So i put itsudo nmap -o 208.80.125.4 (and i have used a lot of other IPs.. It always works correctly without the -o except ...
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4answers
138 views

Mass IP Blocking

I have a game server and someone is spamming it with bots. The SpamBot client makes the handshake with my server using UDP connections. It does this through a list o proxies. Basically, the Spambot ...
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udhcpc and auto IP assignment

I need to assign automatically the IP of the interface for which I request the IP address with udhcpc. The default udhcpc script installed on my system is this: #!/bin/sh # udhcpc script edited by ...
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4answers
47k views

Why can't I ping Google?

I can't ping google.com (unknown host). But I can ping IP addresses. I tried to ping the IP address of Google but it doesn't work. resolv.conf nameserver 8.8.8.8 nameserver 209.139.209.33 ...
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1answer
25 views

Different A records for a domain

I have a domain which A record points to a site, hosted on VPS. Now I want to make a mail server, which is located on a second VPS. To make mail server work I need MX records, which is based on A ...
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2answers
128 views

host can't ssh guest, but guest can

This is a follow-up question from: Make virtualbox get a different IP address than my laptop. I ended up with these /etc/hosts files on both my laptop running Ubuntu 14.04 (the host) and my virtualbox ...
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231 views

Make virtualbox get a different IP address than my laptop

I am trying to setup a 2-node Hadoop cluster (following this guide), where the master is going to be my Ubuntu laptop and the slave a virtualbox running ubuntu. I also read about networking in ...
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CentOS 6 - Order of network interfaces when running “ip address show” command

I have installed CentOS 6.7 on new HP Gen9 server and decided to rename interfaces using udev so they are in order eth0-7 from left to right when looking at servers back (originally interfaces were in ...
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28 views

info to get using last digits of ip address

What is the product/registered owners id based on the last digits of IP#: 85ff:fec9:d41b My facebook account shows a login from that IP# and I am accessing the owner info and login info for my own ...
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1answer
33 views

How to return the nearest DNS IP based upon requesting client's IP?

To achieve a faster internet experience, one aspect that can be optimized is to ensure a client is making use of a nearby DNS, rather than something on the opposite side of the world that might ...
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1answer
461 views

How can I bridge two interfaces with ip/iproute2?

I know how to create a bridge using brctl, but I have been advised not to use this anymore, and to use iproute2 or ip instead(since brctl is deprecated presumably). Assuming this is good advice, how ...
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3answers
365 views

Unable to reconnect 3g connection after new IP was given

I use Debian Jessie 8.2 and I am using a 3G connection using this modem. The 3G connection works fine, except after 24 hours the connection drops and I cannot reconnect. If I reboot the computer, ...
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65 views

How to start and stop a libreswan connection

I have a connection configured on my libreswan instance on two machines. The connection start automatically when I start the pluto daemon, I have try other settings, but the connection also starts if ...