the IP protocol and IP addresses

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3
votes
1answer
31 views

Can I get just the list of network interfaces from ip?

I am looking to retrieve a list of network interfaces. Currently I am returning the results of ip addr and then doing some regex/string searching from output like this: 1: lo: <LOOPBACK,UP,...
3
votes
0answers
11 views

What is the default behaviour of IPv4LL on Linuxsystems?

I'm looking for a good source and confirmation about Dynamic Configuration of IPv4 Link-Local Addresses. The rfc Dynamic Configuration of IPv4 Link-Local Addresses didn't really help answer my ...
1
vote
0answers
20 views

Why I'm able to configure IP address on bridged interface?

Consider following bridge setup: brctl addbr mybridge brctl addif mybridge eth0 I see a lot of people failing their setup on configuring the IP on eth0 rather than the mybridge interface, so I was ...
1
vote
0answers
16 views

If it possible to permanently set a loose source routing option to all ip packages to a specific ip address?

First of all, the loose source routing is a kind of ip options which requires a selected hop to route this package. I wonder if it possible to set loose source routing option on specific ip packages(...
2
votes
3answers
228 views

Append data of multiple files to new file separated by a line

I have more than a hundred firewall rules for many different customers in discrete files in a folder. Suppose the filenames are: 1.wawa.com_firewall_rule 2.newa.com_firewall_rule Each file ...
1
vote
0answers
9 views

Report Multiple IPs to tracker rtorrent

There is an option in rtorrent to report an IP to the tracker. I have a seeding rtorrent box connected to 4 WAN connections. I have configured port forwarding on all 4 wan connections and also made ...
1
vote
0answers
20 views

Does anyone use Netem anymore? Alternatives?

When simulating an IP network you can use Linux built-in network emulator Netem. Together with bridge-utils of course. Simulating packet drop, duplicate packets, jitter et cetera. Is anyone using ...
2
votes
1answer
47 views

Unprivileged ping6 not working

I am trying to get my CentOS v7 server to run IPv6. Root works, it can ping using "ping6 ipv6.google.com", and ifconfig looks great; I see the lines: eth0: flags=4163<UP,BROADCAST,RUNNING,...
2
votes
0answers
41 views

DHCP to assign different addresses for multiple interfaces and subnets

First of all, I'd like to point out that I've read any related questions asked here. So, on my desktop computer (running Ubuntu) I have three NICs - eth0, eth2, eth3. I have links connecting these ...
4
votes
2answers
64 views

Send my IP to remote server every time booting

I want to send my computer's IP automatically every time it boots. I edit /etc/rc.local sleep 10 ifconfig > /tmp/myip scp /tmp/myip <server> exit 0 I tried, and there is no inet addr, ...
1
vote
1answer
35 views

tcp tunnel inside local network with iptables and bridge involved

I want to configure outside and inside forwarding rules to behave the same way, and simplified problem that i have with 'inside part' is like this: if i have compA - eth0 192.168.0.1 compB - br0 ...
0
votes
3answers
26 views

Can I skip some IPs returned by DNS round robin?

archive.ubuntu.com returns 4 IPs. 2 of them are much faster, the slowest one is an order of magnitude slower. Can I disallow some IPs selectively?
-1
votes
1answer
21 views

can a service like isup.me be duplicated on the system for self? [closed]

The Internet or Web as I understand it runs on variety of servers. The browser is the client which gives a URI or URL which tries to go through varied ways to connect to the web-page and render the ...
1
vote
1answer
75 views

Openvpn exclude ip in pool

I have an OpenVPN server running on a Linux Ubuntu box. Multiple clients connect to this server (500+) and that is why I set the server-bridge option like this: server-bridge 10.0.100.1 255.255.0.0 ...
-2
votes
2answers
49 views

check if ip is available [duplicate]

Is it possible to check if ip is free with a script pseudo code would look something like this if [ip is available] echo "IP is available" else echo "IP is not available" fi Can ping be used ...
2
votes
1answer
47 views

User mode linux eth0 connected to host tap ethernet device not coming up

I am trying to setup the network between UML instance running on ubuntu as host. UML--eth0-(192.168.0.254) ----------------tap0--(192.168.0.253)--VM But, I am not able to bring the eth0 device in ...
0
votes
1answer
65 views

SSH connection giving Connection refused error

I am using CentOs. I can SSH from local machine to server A. I can also SSH from local machine to server B. But I cannot SSH from server A to server B: $ ssh -p <portB> root@B root@B's ...
0
votes
1answer
28 views

Understanding Iptables rules to prevent DDoS

Following IPTables rules exist on my system as some preventive measures against DDoS attacks -A INPUT -s 255.0.0.0/8 -j LOG --log-prefix "Spoofed source IP" -A INPUT -s 255.0.0.0/8 -j DROP -A INPUT -...
1
vote
0answers
38 views

Static ip definition for wlan0 not working

I am setting up a web server on my raspberry pi. I want to connect it to my router via ethernet (static ip) but if the ethernet is disconnected I want it to automatically start using the wifi (static ...
1
vote
1answer
36 views

What ip address shall I use? public IP or private ip? [closed]

In AWS environment, we usually have two ip address, public one and private one. When we login on to the host, we use public ip, and we edit hosts file, we use private ip, is it right? What is the ...
0
votes
0answers
24 views

Trace route taken through multiple simulated link clicks on the Linux command-line

I have a Twitter post which links to a website. The website has a counter on it that checks the number of people who have accessed the page. However, I noticed that when looking at the Twitter ...
3
votes
1answer
42 views

Unable to access internet after making ip static in beaglebone black

I am newbie in Beaglebone black. I am trying to make my IP static in my Beaglebone black. For this I follow this tutorial. After making changes according to tutorial, my /etc/network/interfaces file ...
5
votes
4answers
249 views

Is there a way to find self's dynamic public ip address using cli in Debian? [duplicate]

The easiest/simplest understanding of the web is a. When you connect to your ISP, the ISP gives a dyanmic address (like a temporary telephone number) only for the duration of that connection, the ...
2
votes
2answers
65 views

Static IP configuration on openSUSE

Long-time Windows user here -- this is a beginners question, network-configuration (especially on Linux distributions) is not my area. I believe I've done my research, however. Although I might've got ...
0
votes
1answer
51 views

Trouble Creating Virtual_IP for PaceMaker + Corosync - CentOS 7

Ok so I have gotten fairly far into the configuration successfully, the two nodes have authenticated each other and all is well, but when I try to add the virtual_ip it never starts. What i've used ...
1
vote
1answer
28 views

Raspberry Pi port fowarding redirecting to wrong local IP

I'm attempting to host a website from home using a Raspberry Pi with this tutorial. After following all of the instructions and finally testing the result by entering the NoIP address in my browser, I ...
1
vote
1answer
21 views

Multiple website on a single droplet with no Apache/Nginx

I have a single droplet at Digital Ocean and I host my website there. It's a standalone application with a built-in webserver. I want to host another website on that droplet as well. It'll also be ...
3
votes
2answers
82 views

How to track my public IP address in a log file?

I'd like to save my public IP address to a log file so I can use them to exclude my own visit to my websites in the stats collections. At the moment I can see my actual public IP address--whatsmyip....
0
votes
0answers
31 views

how to mute an IP stack?

is there any way to mute a network connected device running Linux so that it receives every message targeted on its IP but not sends anything even Acks? or in my case is there anyway to assign same IP ...
0
votes
1answer
52 views

Connecting to server on localhost with same source and destination port

Here is simple server listening to port 80 of localhost: nc -4 --listen 127.0.0.1 80 Here is the client to connect to server on localhost using source port same as destination port of server: nc -4 ...
0
votes
1answer
35 views

Cannot access WHM and SSH/root after a configuration in Host Access Control

I added my IP (like 172.32.1.0/255.255.255.0) to allow access for ssh, whm and cpanel in WHM -> Host Access Control. Then, I added all IP to deny access for them. However, after saved changes, I lost ...
0
votes
2answers
104 views

How to access server without IP-address

I have a centos server that was previously on my company's network using a static IP address, but it has since been blocked/firewalled on the network such that I'm not even able to ping it. I was told ...
0
votes
0answers
85 views

Setting multiple IP addresses on private network interface using Vagrant

I am trying to configure IPv4 and IPv6 address on Internal network Vagrant interface but I am unable to do so. Here is the configuration: config.vm.network "private_network", ip: "192.168....
1
vote
0answers
41 views

Userspace Network Stack

I am writing a (very simple) userland IP network stack. For this purpose, I need to go "around" the OS network stack and obtain the raw Ethernet frames. The tap interface sounds like a way to go, but ...
1
vote
0answers
39 views

multiple ip in an android payload(Kali linux)?

I'm using Kali linux 2.0 and I'm trying to make an android msfvenom payload that uses multiple ip, What I mean is that when the msfvenom app is opened in my phone it stays trying to connect to the ...
6
votes
3answers
155 views

Is it possible to initiate an IP connection between two NICs in same PC externally?

If two NICs in a Linux machine are directly connected with each other using an external cable, then is it possible to initiate an IP connection between those two NICs over this cable? I configured my ...
0
votes
0answers
12 views

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 ...
1
vote
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/...
0
votes
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 ...
1
vote
0answers
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 ...
0
votes
0answers
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 ...
0
votes
0answers
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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: ...
0
votes
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 ...
0
votes
0answers
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....
1
vote
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 ...
0
votes
1answer
188 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 ...
4
votes
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 ...