the IP protocol and IP addresses

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1answer
938 views

Can nmap display only hosts with specific ports open?

Can nmap list all hosts on the local network that have both SSH and HTTP open? To do so, I can run something like: nmap 192.168.1.1-254 -p22,80 --open However, this lists hosts that have ANY of ...
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2answers
49 views

Unable to connect remotely to custom application

I've built an application that listens on the localhost address and a specific port, lets say port 11001. Its on a remote machine with CentOS. I currently have a python script on my local machine that ...
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1answer
341 views

Virtualbox - how to give Internet access and internal network access to two VMs?

I made two Virtualbox virtual machines, CentOS 7 latest iso. I gave them each 2 network interfaces, one NAT and one "Internal network" in order to get them to talk to each other and have Internet ...
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4answers
165 views

Finding Servers Public IP and Allowing Remote Access

I want to turn a computer that I have lying around into a file server. The problem is that I cannot find my public IP. I have used services such as myip or even google, but they all point to the IP of ...
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5answers
622 views

How to log Internet connection drops

I need to execute a script as soon as my raspberry pi gets connected to the Internet. However I was wondering if there was a better way than just pinging Google every minute or so. My problem is that ...
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1answer
160 views

Why doesn't FTP work through my ssh tunnel?

Computer A (assumed that ip is 44.44.44.44)can ftp the host 130.89.148.12. ftp 130.89.148.12 Connected to 130.89.148.12. 220 ftp.debian.org FTP server Name (130.89.148.12:debian8): anonymous 331 ...
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1answer
32 views

OpenVPN to access restriced pages

I am looking for a method to go out with different ip in order to access some sites that are blocked by my local provider(I need to write scripts to retrieve data from thos pages).On ...
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1answer
80 views

Nothing happens when trying to add/set default gateway

I'm connected to a network using VPN (Managed byt NetworkManager, Fedora 23), and I want to route all traffica via the VPN network. But for some reason nothing happens when I run ip route add or ip ...
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1answer
475 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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1answer
90 views

Telnetting the local port working but trying with ip not working

My question is similar but opposite to to Telnetting the Local port not working but trying the ip working For me, telnet to the local port works but trying with IP does not work :( I am running ...
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1answer
101 views

Two Virtualbox systems with same IP address

I need to test an issue with nfs so I spun up a couple of VirtualBox VM's on my system. One is RHEL7, another CentOS7. Each has a unique MAC address when viewing settings> network. Both VM's boot ...
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1answer
31 views

How can I tell which IP address is used to connect to another machine?

I have several computers that are multi-homed, and have different static IP addresses for each of several network connections. How can I tell which of these IP addresses is used when I'm connecting to ...
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1answer
753 views

server can't find xxx.xx.xxx.192.in-addr.arpa:NXDOMAIN

$ORIGIN xx.xxx.192.in-addr.arpa. $TTL 86400 @ IN SOA dns1.testserver.com. hostmaster.testserver.com. ( 2001062501 ;serial 21600 ;refresh after 6 hour 3600 ;retry after 1 hour 604800 ;expire ...
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3answers
790 views

Validating IP addresses (IPv4 and IPv6)

Quite simply I'd like to verify that a string represents a valid IP address in a bash script. I think like many others I've fallen into the pitfall of trying to do this with a regular expression; ...
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2answers
139 views

Find IP owners from apache log file

I have the top 10 IPs making the most requests and the number of requests made from Apache log file example. I used this bash command to handle a request: cat access_log|cut -d' ' -f1|uniq -c|sort -r|...
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1answer
236 views

FreeBSD: adding ip alias to interface breaks network on primary ip

I am trying to add an alias to my network card (I would like to use jails) on my FreeBSD box. It is running version 10.2-RELEASE-p7 (generic amd64 kernel). The machine is running in a Hyper-V virtual ...
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0answers
148 views

Not permitted to add eth0 to bond0

I'm trying to add an interface to my bond0 but I always get the error. sudo ip link set dev eth0 master bond0 RTNETLINK answers: Operation not permitted I already tried it with sudo and with ...
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0answers
472 views

ip link add gives me an error that it's not supported

I would like to set up a bridge with iproute2 like this: Adding bridge : ip link add name br0 type bridge Bringing bridge UP : ip link set dev br0 up Adding interface to bridge : ip link set dev eth1 ...
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2answers
224 views

iptables: No chain/target/match by that name - adding SSH ATTACK rule

I have a problem with adding rule against brute-force SSH attacks. I try to do it in the following way: iptables -F iptables -L iptables -N SSHATTACK iptables -A SSHATTACK -j LOG --log-prefix "...
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3answers
201 views

Arithmetic on variable containing ip address

I've got variable network="198.168.1.x" # for ex. 198.168.1.254 I want to create new variables: next_serv="198.168.1.(x-1)" # for ex. 198.168.1.253 max_host="198.168.1.(x-2)" # for ex. 198.168....
2
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1answer
111 views

Grepping and sedding IP from ip addr show

I'm trying to get just the local IP of my Arch VM. I've managed to get just the line containing what I want with grep, but I also want to trim it down with sed. inet <<192.168.0.16>>/24 ...
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1answer
242 views

Need to grab IP of visitors from the Apache logs

I want to store the IP of the visitors to my website, and I want to use PHP. Should I use cron for it or how will be the visitors' IP will be automatically stored?
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0answers
22 views

How do you interpret these routes? or more or more specifically, what is scope link?

I don't understand completely what these routes mean: [root@samplehost ~]# ip route show ...#default route here 10.68.172.0/24 dev eno33557248 proto kernel scope link src 10.68.172.20 169.254.0.0/...
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2answers
31 views

Which ip is used when two net cards all can be used?

There are two net cards in used status in my pc. ifconfig eth0 Link encap:Ethernet HWaddr e0:3f:49:57:4b:d1 inet addr:192.168.1.3 Bcast:192.168.1.255 Mask:255.255.255.0 ...
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1answer
56 views

Adding route entries to the routing table

I have a device that has a default IP address of 10.1.1.102 with netmask 255.255.255.0. Rather than changing it, I tried to add a routing entry to my routing table using route add. sudo route add -...
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2answers
64 views

Show netmask using ip tool

I would like to know how to get the mask of a network interface. With ifconfig it is very simple, but I have to use the ip tool, and ip addr show is not showing me what I want. Here is an example ...
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1answer
19 views

Translate from IPv4 to IPv6 and backwards

I have the following situation: Two computers, one running Debian, the other one Ubuntu. The first one is connected to the internet via an interface which somehow only allows IPv6-connections, and ...
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1answer
70 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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0answers
21 views

ip-tunnel: “Tunneling with a fixed ttl always makes pmtu discovery” - why?

The manual page for ip-tunnel says: ...fixed ttl is incompatible with [no PMTU discovery] option: tunneling with a fixed ttl always makes pmtu discovery. What is the reason for this? I do not see ...
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0answers
30 views

How to force dhcpcd to forget an old static address after editing dhcpcd.conf?

How can I force dhcpcd to forget a previously configured static address after setting a new one in /etc/dhcpcd.conf? I changed: static ip_address=192.168.1.1/24 to static ip_address=192.168.1.2/...
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1answer
740 views

Virtual Box guest on different subnet than host

I currently have my Debian VM using NAT and it is on subnet 10.0.2.x where my host is on 192.168.0.x how can I get my guest on the same subnet as my host? Host: Ethernet adapter VirtualBox Host-...
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1answer
835 views

Zookeeper DNS name problems with leader elections when migrating from Windows to Debian

I am migrating a kafka/zookeeper cluster on Windows to Debian wheezy. Java version: 1.7.0_80 Debian version: 7.9 Zookeeper version: 3.3.5+dfsg1-2 0 Kafka version: 2.10-0.8.2.1 If I configure ...
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0answers
81 views

linux to linux IP MASQUERADING failed (can't ping ip server)

I'm new in linux, i'm trying to IP MASQ. So the diagram is like linux A is connected to HUB and Internet, and linux B is connected only to HUB. In linux A i have eth1 (10.10.10.5) and eth0 (192.168.1....
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1answer
76 views

How do you add a virtual network IP address from the kernel command-line?

I would like to add a virtual IP address, something you normal do with: ifconfig eth0:0 192.168.1.1 (or via /etc/network/interfaces). But, I'd like to do it from the kernel command-line, which has ...
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0answers
33 views

Any potential problems when configure multiple NIC for isolated networks to have same subnet?

System I have an ARM Linux (kernel 3.17) for field use and it has multiple NIC, say eth0, eth1, and wlan0. On the left side, I need to use a PC0 to configure the ARM Linux so that it can change it's ...
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2answers
249 views

SSH: shell opened in IP namespace

I'm trying to force users logging in through SSH to have a shell inside IP namespace. I've tried replacing the shell in /etc/passwd with something like ip netns exec sshns /bin/bash but it didn't ...
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2answers
103 views

Why are `netmask`, `network`, `gateway` and `dns-nameservers` needed for setting up a static IP?

When setting up a static IP, you need to change /etc/network/interfaces to: auto eth0 iface eth0 inet static address 10.253.0.50 netmask 255.255.255.0 network 10.253.0.0 gateway 10.253.0....
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1answer
496 views

On switching from NAT to bridge, have network issues in kali 2.0

Found few similar questions but none of them are answered so re-asking a similar question. I have a vmware 12, have kali 2.0 latest installed. First I try on NAT it works great but when i switch to ...
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0answers
59 views

My wlan1 shows 2 different ip-addresses

I have a raspberry pi which I'd like to use as a router and access point. I have a working eth0 connection and a working wlan0 connection. However, something is wrong with my wlan1. I noticed the ...
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1answer
126 views

Get IP Address of Main Interface in Ubuntu and Mac

I need to write a script that gets the IP address of the interface that is used for unknown routes (e.g. where 0.0.0.0/0 is routed through) That script should work on Ubuntu, Debian, Arch and Mac OS ...
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2answers
332 views

What's the use for the special ipv6 addresses in /etc/hosts?

I have the following block in my /etc/hosts: # The following lines are desirable for IPv6 capable hosts ::1 localhost ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::...
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0answers
12 views

Fedora17 ip forwarding issue

I am trying to setup a hostapd in Fedora17. I have configured both hostapd and dhcpd .. Now, the client is also getting IP address, but i am not able to configure iptables correctly to enable NAT and ...
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2answers
445 views

Check whether an IP belongs to a specific range

I have a log file that lists whitelisted IP ranges in this manner: "217.29.0.0-217.29.255.255", "204.12.0.0-204.12.255.255", "198.54.223.0-198.54.223.255", I am also working on a bash script which, ...
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2answers
181 views

How to count how many ip in bash?

Does anybody know how to count how many ip in bash? For example: Command: root@ubuntu:~$ dig www.google.com A +short | grep -oE "\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?\.){3}(25[0-5]|2[0-4][0-9]|[01]...
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4answers
604 views

Device vs network interface IP addresses

I'm trying to understand the relationship between: A "networked" Linux device; and The physical NIC card located on that device (giving it the ability to be "networked"); and Various Ethernet/Wi-fi ...
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0answers
15 views

Connecting to a LAN Device from Different Interfaces on Different Networks

Is there a way to connect to a LAN Device when many different network interfaces are connected to different networks? I find that it can differentiate when the IP address is within only one of the ...
3
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1answer
273 views

add route in Linux if sub-net, where gateway is situated, is not configured

I have a PC which has 192.168.1.1/24 configured to eth0 interface. Now if I try to add routes via 10.10.10.254, the ip utility reports that No such process: root@PC:~# ip neigh add 10.10.10.254 ...
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3answers
416 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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2answers
151 views

How can I change Ubuntu server IP Address to the web address?

How can I change Ubuntu server IP Address to the web address? For example, the address that I need to access on the browser is 192.168.x.xxx. How can I change to dev.robi.local? Thanks!
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1answer
38 views

How can I find my client's linux box on the internet automatically?

I'm looking for a way to have a client's machine "phone home" periodically so that I can easily do a ssh login if necessary. I was thinking a simple script that grabs the public IP address and posts ...