the IP protocol and IP addresses

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How to access a inet6 address from browser

I have installed a pre-built Virtual Box image on an OS X host, and started it up. It's running Ubuntu 12 and Tomcat. From within the box the adapter information only contains an inet6 address (see ...
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1answer
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How does Linux prevent applications from sending more packets than the link can handle without dropping packets?

I couldn't make the question any clearer so here's an example scenario: Given a Linux machine connected to an IP network through a physical interface of bandwidth 10Mbps (or a higher speed interface ...
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Network tool to monitor IP packet fragmentation

Is there a tool, similar to iptraf, that would let me see how many incoming/outgoing IP packets get fragmented/defragmented, and what percent of traffic they are? I know this can be counted with the ...
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IP packets fragment randomly

I've observed the strangest thing - the same packet, same size, send through the same interface sometimes gets send whole, and sometimes gets fragmented, as if it exceeded the interface MTU... 1472 ...
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1answer
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Which ip alias is currently active? [on hold]

I used IP aliasing technique to assign multiple IP addresses on a single NIC. I am using these IPs in a Python script to generate traffic. I am doing this for my college project. How can I determine, ...
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why are there different formats for the hosts file between OpenSuSE and Ubuntu?

How is 127.0.0.1 related to 127.0.0.2? Using ssh to login to tleilax (OpenSuSE): tleilax:~ # tleilax:~ # hostname tleilax tleilax:~ # tleilax:~ # hostname -f tleilax.bounceme.net tleilax:~ # ...
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Why 192.168.1.105 = 127.0.0.1 in my pc?

I have installed apache2 in my debian7.8 . When to input 192.168.1.105 in firefox i get the same output as 127.0.0.1 ? It works! This is the default web page for this server. The web server ...
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What is the first event/file/log in linux that appears/changes on boot that signalizes network being up?

I have a vSphere farm with virtual machines and python script that handles cloning and managing of those VMs. I also have a machine (RedHat 6) that I clone if I need a new one. It has a script that ...
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19 views

Invalid IP parameter on nginx setup

I'm currently setting up an an nginx web server with PHP on ubuntu 10.x lastest. I've set it so it will only use my local LAN for testing but it comes with invalid paramter for 192.xxx.x.0/142. My IP ...
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3answers
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What's the difference between a machine's IP address and localhost

It is silly stupid question for you all. But until i know the answer , it is difficult for me. Doubt has raised from my another question Where if i give localhost to my path, it works. But it doesn't ...
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Is dynamic DNS the only possible way to establish a connection between two routers with temporally IPs?

the situation is as follows. My and my friends Pcs are connected within a WLAN with a local IP to a router, the router gets its global IP from different ISP with a limited pool of IPs, so the ISPs ...
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How to find MAC or IP address of a device connected to the same Ethernet bridge?

I have the following topology: DeviceX ------ | DeviceX bridge with two Ethernet cards (created with bridge-utils) ---------------- router | ...
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What's wrong with the mapping?

I am running two docker containers one is for hadoop basic services and other is for flume. Services are running successfully. I linked two containers env variables are automatically set by docker ...
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1answer
33 views

ifconfig made my server unreachable

I just got a second IP address for my Debian Squeeze root. I tried to add the address to my network but somehow I messed up. The command I executed: ifconfig eth0 [new ip address] mask ...
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2answers
39 views

Output only the IP addresses of the online machines with nmap

I know how to use nmap to find the list of hosts that are currently online. What I would like to do is get a list of just their IP addresses, now it displays extra information such as Nmap scan ...
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3answers
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Can a Linux system have two IP's Simultaneously?

Recently I installed apache2 on Raspbian and after end of installation I entered the following cmd and got two IP's. $ hostname -I 192.168.1.17 192.168.1.24 Of this, I have been using the IP ...
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delay in IP route deletion

(Apologies if this is the wrong StackExchange for this question, but there does seem to be some confusion regarding appropriate targeting of IP networking questions) I am very much a network newbie, ...
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1answer
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Strange ip command output

When I call ip addr show I get output with all interfaces and their IP addresses (look at eth7): 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback ...
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How to make sure to get the Main/External IP without regard to network device type/name

Hello, I need to make sure I have the external or at least the main IP address for a given machine, regardless to the device type/name. I quickly wrote that tiny script for that purpose, but I need ...
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No DHCP OFFERS on several PCs in same network

I have different PCs and 2 of them don't get an IP-address (because they don't get a DHCP-offer) by the ISP, while the others do. I pluged them directly in my cable-modem, one after another. But when ...
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1answer
38 views

How can I have a bridge that uses DHCP?

I have set up a linux box (centos 7) to use for virtualizing some servers. I have set up a bridge, but I need to do it with DHCP, but it doesn't seem to like it. The reason I need DHCP is because ...
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What's the shortest way to find my WAN IP address at the command line? [duplicate]

What's the shortest command I could use to find out my WAN IP?
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Why can I connect to the IP of a network interface (on a server with multiple network interfaces) when the network cable is removed?

I have a Server with multiple (four) network interfaces running Arch Linux when I encountered something strange that I cannot explain. I have two interfaces configured to the the ip addresses ...
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1answer
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Connect to offline network on second interface

I would think there's likely a dupe of this around but I cannot find it. I have an offline router I'm using to connect a remote wireless device. The router cannot be configured as an access point, ...
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90 views

Is Traffic control inside namespace on ports created by OpenvSwitch supported?

I am trying to limit the bandwidth of an interface inside a namespace using tc without much success. Seems it's not supported according to ...
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ping localhost sometimes fails with sendmsg: Operation not permitted

I have a problem with network adapter (i think) , look I trying to ping my self and got a error sometimes, how this can be ? First time in my life i see this. # ping 127.0.0.1 PING 127.0.0.1 ...
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How to find public ip for a freebsd system [duplicate]

Can someone tell me a command that will find my external ip for a freebsd 10 system.
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1answer
215 views

Trouble switching from DHCP to a static IP on Kali Linux

When I installed Kali Linux 64bit, I forgot to set up a static IP address, and now DHCP determines my address with my router. I have already modified /etc/hosts and /etc/network/interfaces to declare ...
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IP routing to domain

I have a remote device that sends data to an IP address through a specific port. The problem I want to solve is that I need it sends data to a domain, but device only allow set IP addresses. I want ...
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1answer
53 views

disable dhcp in initramfs

In Debian, how can I tell initramfs not to request an IP address via DHCP? I'm using initramfs-tools. I'd be okay with assigning a static IP address for the initramfs, but I can't find how to set ...
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Float MAC address in Heartbeat format

It's been about a month where I've been working with "High Availability" on Elastix based on DRBD and Heartbeat. As you maybe be familiar with it, there is a file in Heartbeat called haresources ...
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Add ipv6 route so packets go to eth0

I have 2 VM Ubuntu 14.04 in VirtualBox. They are connected in internal network. One Ubuntu is sending multicast data (via VLC) and one is receiving. I added this in both VM's so it works via IPV4 ip ...
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Fake IP addresses generator

I have an application running on a server that adds a new iptable rule blocking every IP address trying to connect via SSH with a wrong password. Now, I'd like to perform a stress test where many ...
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1answer
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ifconfig command showing internal ip address

I'm using centOS 6.3 on virtualbox as guest OS on Win 7 host. My problem is when I use ifconfig command in terminal, I'm being thrown internal IP address(10.x.x.x). However, when I googled "my IP ...
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Two virtual machine instance with same network on same host

Is this possible to have two (or more) instances of a virtual machine on a host with the same IP address (like 192.168.0.X)? What are the possible ways of implementing this? I need the two virtual ...
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1answer
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Adding routes for configured virtual IP addresses of different segments

I have configured virtual IP addresses in different segments as below in RHEL box. eth0 - 192.X.X.208/27 eth0:1 - 192.X.X.219/27 eth0:2 - 10.72.X.19/24 eth0:3- 10.72.X.20/24 The problem here is as ...
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Where to find a basic tutorial/book on Linux networking? [closed]

I am not sure this question is eligible for this forum, so if not, please provide which forum is more suitable for this question. What I am looking for is a basic introduction in how networks work ...
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2answers
87 views

Show GEO IP information in Firefox when using tor

I've configured Firefox to use TOR (SOCKS proxy via localhost). Everything works great, but I would like to see at any time which IP in which country I'm using. is there a Firefox Addon, which ...
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Understanding NAT concepts

I began learning networking on Linux, and I am looking for a way to associate a particular IP to a particular MAC address (i.e. a way to edit the NAT table?). Actually I am trying to assign some IPs ...
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Accessing CentOS7 server from public

recently I switched to CentOS 7 OS and set up basic webserver with Apache. I had no problems configuring SSH, FTP and LAN access to the webpage. But accessing from other IP's won't work. I'm 99% sure ...
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1answer
51 views

rkhunter reports /sbin/ip has changed

I am using rkhunter 1.4.2 on CentOS 6.5. A message, in /var/log/rkhunter.log is Warning: The file properties have changed: [09:40:35] File: /sbin/ip [09:40:35] Current size: 247396 ...
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133 views

How to display the IP address of the default Interface with Internet connection?

I need to create a script that outputs the internal IP address, that is configured as the default Interface.
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285 views

How to forward IP traffic between wlan0 and eth0 without killing network performance on the forwarding machine

I have a laptop running Debian 7 that connects to my building's Wifi. I want so share this network connection via the laptop's Ethernet port. I have setup a script below to do this based on some ...
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2answers
50 views

If I send SYN / ACK with one IP and other packets with another, what happens?

I'm learning about UNIX and network programming. I'm not yet sure how to implement this. But I'm wondering: If I forge IP packets of a TCP connection to a server, so that the SYN / ACK packets use ...
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1answer
131 views

kernel martian source to and from same IP

We are intermittently seeing kernel: martian source log entries for eth0 on a couple of our servers. The interesting thing is that they are to and from the same IP. For instance: Nov 4 02:20:27 ...
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1answer
71 views

Relay server for generic TCP traffic?

Here's my situation: I have a computer (Mac) on a school network that I want to port forward TCP 5222 to for ejabberd, but of course I can't. I have a server at home (Mac with FreeBSD VM) that I can ...
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Network connectivity trouble to non-routing multi-homed hosts?

I have two networks: A and B (172.16.2.0/24 and 172.17.2.0/24). A is Ethernet, B is WiFi. An OpenWRT router connects A and B, and most traffic gets passed OK. Default route on router leads to a ...
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Egress packets do not use non-default routing table

I made a custom routing table named test: # ip route show table test default via 10.10.10.126 dev eth0 # As seen above, it contains only a single route. As a next step, I made a rule where traffic ...
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1answer
90 views

Bring network interface down if physical connectivity is lost

I have a headless Debian server with two network cards: 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000 link/ether 01:02:1d:54:7c:01 brd ...
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Hiding Your IP on Linux [closed]

I've always been a Linux fan but I find it so surprising that unlike Windows, it doesn't have software like Real Hide My IP which is a software that allows you to select a country, change your IP and ...