IP - Internet Protocol, the most commonly-used set of rules for dispatching data across a large computer network.

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Finding local IP addresses using Python's stdlib under Debian jessie

I am writing a distributed systems program in python, and in this program I need to know the local ip-address... eg. 168.192.... 10.13..... etc, not 127.0.0.1 or hostname. I have found following ...
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2answers
1k views

Redhat / CentOS Static Routing

Looking for some advice, I'm pulling my hair out trying to figure this out! Running Redhat (CentOS) with fairly normal configuration and I've disabled the firewall for now. I have a web server which ...
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1answer
39 views

how to make server visible from internet [on hold]

I have ADSL router with Static IP from my Internet provider. I know that, if I connect my server to router it can be visible from internet (working webserver etc.), but how does clients getting page ...
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1answer
29 views

Default gateway and ARP confusion

I have the following configuration (I'd post a pic but not enough rep for more than 2): PC1 (10.0.2.10/24) and PC2 (10.0.2.137/29) are connected to a hub, which is connected to a router on interface ...
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1answer
21 views

How to tell squid use Source IP address for sending requests?

I have two interfaces in my ifconfig, eth0 and eth1. Squid is set to accept connections from both of them on port 3000. However, eth0's ip address is always used to send proxy requests, even if ...
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0answers
16 views

Server request timeout? [on hold]

I just setup zPanel on my server (an install of Apache, PHP, MySQL, etc). I set up a domain to point to the server IP and gave that to the installer. Though, now when I try to access or even ping the ...
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0answers
14 views

Home server not accessible from local IP [on hold]

I have local machine on which Apache web server is running. I have set up port forwarding on my router to forward ports 80 and 443 to that machine. When I access the domain associated with my router, ...
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1answer
31 views

Ubuntu: Persisting IP Route Change on Reboot

The following command at the terminal gives me the networking changes I need: ip route change default via 10.255.255.1 dev eth0 src 82.82.82.82 To persist this on reboot I add the following to ...
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1answer
23 views

Route HTTPS traffic to different virtual servers on single IP

I have Proxmox instance with single IP available. I have multiple virtual machines for different sites (domains). Each virtual server have it's own https certificates inside them. I need to find way ...
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1answer
18 views

why when i use tracert in powershell,it doesn't return complete reponse?

i use tracert in power shell,but it can not show all path,some parts talks Request timed out. Tracing route to google.com [216.58.212.78] over a maximum of 30 hops: 1 33 ms 33 ms 32 ms ...
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0answers
18 views

How do I properly configure KVM

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
32 views

Assign more than one IP Address to the same MAC Address on Linux ISC-DHCP Server

I have the following question: One Linux DHCP server in pool mode, because of the step of fabrication, all the products have the same MAC Address that is changed at end of line, the boards use ...
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1answer
16 views

VPS Ubuntu connection timeout when I try connect via IP in browser

I have a problem with my VPS. It has installed Apache. When I trying to connect from specific network (home) I can easily access to it. When try on another one (for example 3G) it returns 110 - ...
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1answer
38 views

Why when i use netstat while not connected to internet, it returns some ip addresses?

I read that this command displays network connections for the Transmission Control Protocol more info link netstat ,but when i not connected to internet and i turn off XAMMP server,it returns some ...
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0answers
14 views

List all systems that reference SYSTEMX by IP

Given SYSTEMX (on a Windows domain), is there a simple way to figure out what other systems on that domain are referencing SYSTEMX by IP (not name)? If the best that one can do is find only some of ...
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1answer
70 views

Pinging Hostname results in reply from 2 different IP addresses

I have an odd behaviour on my Windows 2008 R2 server, when I ping a hostname of another system, my first reply has a different IP address then the following replies. For example, if I was to ping ...
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0answers
22 views

IP Address and Dom0 IP Address

What is the difference between normal IP address and Dom0 IP address? As far as I read so far, Dom0 IP is associated with VMs instances but I want to know if it there is a subtle difference here.
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0answers
27 views

Configuring a different Subnet Mask rather than the one Configured in the Network Router [closed]

Let us say, I have a host configured as 192.168.x.x/24. This is connected to a Router whose Subnet mask is /23 or 255.255.254.0 What difference Would it make if I have configured the host as /24 ...
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1answer
16 views

How to let FreeBSD get IP address automatically in VMware?

I use FreeBSD 10.2 VM image in VMware workstation. Although I set bridge mode in VMware: I find the OS can't get an valid IP address: How can I let FreeBSD get IP address automatically in VM?
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2answers
2k views

SBS 2008 DNS issues in BPA

I'm gettng constant Critical Issue events in the Small Business Server Best Practices Analyser & resulting SBS Console reports that begin "The DNS client is not configured to point only to the ...
2
votes
2answers
267 views

Cannot ping remote server; how can I debug local networking misconfiguration vs my IP is blocked?

I manage a KVM VPS at 104.143.14.103 that for some reason cannot reach http://pecl.php.net. When I ping the IP address of the PECL server (104.236.228.160), to make sure that it isn't a DNS problem, ...
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2answers
1k views

Draytek 2830, Multiple VLANS on Same Port

The Kit Ubiquiti Unifi Long Range Wireless Access Point Cisco SG200-08P Switch (VLAN, POE Support) Draytek 2830VN Router The Problem I need to enable Multiple VLANS against a single port on the ...
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2answers
26 views

How to host multiple apps on one server and point multiple domains to them?

I am trying to figure things out and I am confused. I know some things but not enough. I know that domains actually point to the IP address of a server. So if I want to have two apps, they both have ...
133
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10answers
364k views

What's the command-line utility in Windows to do a reverse DNS look-up?

Is there a built-in command line tool that will do reverse DNS look-ups in Windows? I.e., something like <toolname> w.x.y.z => mycomputername I've tried: nslookup: seems to be forward ...
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2answers
70 views

Why are subnet masks specified in full dot notation, rather than just a number?

Subnet masks for IPv4 (dunno about v6) are specified in full dot notation, e.g. 255.255.255.0. This means that the lower eight bits can be used to assign IP addresses to devices on a LAN (if I ...
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1answer
45 views

Multiple IP addresses

I am developing a number of mobile websites (using IIS), and I want to test them using my mobile device which is connected on the same LAN. I would like to access each website via a different local IP ...
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1answer
22 views

Most robust way of forwarding multiple URL via one IP

This is probably subjective but if anyone could suggest a robust solution for the following that would be fantastic. We have potentially multiple URL's in service which are currently 1:1 with Public ...
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2answers
52 views

Tunnelling through an IP alias

I have a server machine with a dedicated IP and several IP aliases. It has a single network interface and on it there are multiple IPs "attached". So let's say IP1 is the main ip but I also have IP2 ...
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13 views

What is the Red Hat equivalent of the windows “Register this connections Address in DNS”

Hi I have a collection of RHEL6 server each has 3 static IPS and interfaces Currently when we nslookup the hostname from another server it returns all 3 interfaces from the DNS server (windows) We ...
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1answer
34 views

Check if IP address is allowed through firewall

Our cloud service requires that the client's server allow specific IP addresses be whitelisted in their firewall. If the IPs aren't whitelisted, the end users will experience issues, but the end users ...
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0answers
4 views

how to network on VirtualBox (internal networking mode) [migrated]

Having 2 virtual machines running debian, i'm trying to make them communicate by using static ip. the solution was to choose the Internal Networking Mode under Virtual Box. Unfortunately the ...
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38 views

Use a /29 block on a Hetzner KVM Setup

I have been trying to assign the IP's I got from this 5.9.192.32/29 block. I have followed every step in this tutorial, but I end up with no connectivity on the guest VM's. My Host configuration ### ...
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0answers
28 views

netstat and retrieving user ip behind cloudflare

Im wondering if its possible to retrieve user ip behind cloudflare (HTTP_CF_CONNECTING_IP header) with netstat netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n
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1answer
34 views

Point multiple ips to one server

I'm trying to setup a squid proxy on an ubuntu server. I happen to have multiple ip addresses that I bought along with the vps. Is it possible for me to setup the 2 extra ip addresses to point to my ...
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0answers
29 views

What does it represent, when source IP and destination IP are same in Fortigate logs? [closed]

I am working on SIEM, while analyzing FORTIGATE logs I came across a scenario where source IP and destination IP is same. This is a local IP of network where destination port is 53 which represent ...
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1answer
30 views

Configure Azure IaaS VM to allow access by IP

I have an Azure IaaS Windows 2012R2 VM which is hosting a test website. The site is accessible externally by the hostname. What do I need to do to enable access to that same site by IP address? When ...
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2answers
2k views

How to use pfSense as a firewall in order to assign url whitelists to IP groups

In a corporate network without DHCP, the temporary solution to whitelist a couple of useful sites is to change the hosts file under Windows/System32/drivers/etc/ but since modern sites tend to change ...
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2answers
31 views

How can I see IP addresses attempting to connect to my Amazon EC2?

I have an EC2 instance that is setup as an SFTP server using OpenSSH. It only allows connections on whitelisted IPs via TCP Port 22 (limited via an EC2 Security Group). I constantly have customers try ...
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4answers
26k views

Where does Amazon publish the range of IP addresses used for EC2 instances by region?

How can I keep updated of changes to the range of IP addresses that Amazon will use for EC2 instances. I want to add a range of IPs to my firewall settings to allow access to my 'ground based' mysql ...
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0answers
23 views

Static route to access another IP/SUBNET from PC

Maybe it's a simple concept misunderstand. I'm in a network with ip 172.16.0.xxx (mask 255.255.240.0). How could I configure my PC (Windows 7) with a static route or any other kind of solution so I ...
0
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1answer
48 views

How to assign an IP for Hyper-V virtual machine using PowerShell?

I'm working with the Hyper-v and have created a VM using Vagrant. Seems to be in the Vagrantfile I've forgotten to define an IP address (static or dhcp use). Now I can view the info about the VM's ...
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2answers
180 views

How to whitelist an ip range blacklisted by Spamcop

Our testing team uses email addresses from a domain which is different from the actual site domain. For example, our site is www.abc.com and email addresses are belongs to user_x@xyz.com. www.abc.com ...
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4answers
18k views

What happens when ARP Request comes from a different subnet?

What will happen when an ARP Request packet is sent from router1 to router2 in the following two cases? Will an ARP Reply be generated or the ARP Request packet be dropped? ...
0
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2answers
32 views

Implement an IP on Debian to redirect & failover on 2 external IPs

Hello network & sys gurus, I would like to use one Debian server inside a cluster to host a IP 1 redirecting to IP 2, or if IP 2 is not reachable, redirecting to IP 3. IP 2 and IP 3 are hosted ...
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6answers
2k views

How to check, if IPs in your network are blacklisted?

I would like actively monitor, if any of my network IPs are on blacklists. Here I would like to collect links to instructions, how to sync blacklists, which allows that.
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4answers
4k views

Openvpn, forward packets very slowly

I rebooted my server, and an odd issue just came out. I am running on ArchLinux, the clients are Ubuntu, Android and Mac. The problem is that accessing the internet via the clients is slow, about ...
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1answer
39 views

Retrieve old IP settings form Windows

This is pertaining to Windows in general (XP and all recent versions) After replacing an old motherboard with a new one, the NIC is different, has a new MAC address and generally needs a new TCP/IP ...
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3answers
44 views

How to assign multiple public ip addresses

I have a server (Ubuntu 14.04) and want to assign these multiple public ip addresses. Expected: I want to ping all IP-Addresses from XXX.XXX.XXX.128 to XXX.XXX.XXX.143 Current Setup: ...
5
votes
3answers
9k views

What are the differences between Floating IPs and Virtual IPs?

This might be a pedestrian question but what is the difference between a "Floating IP" address and a "Virtual IP" address? Are they synonyms?
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0answers
33 views

How to find source of failed RDP login

I have been struggling with this issue for a while now. I have a Windows Server 2008 R2 at home, which I access via RDP. For a few weeks now I have random IPs trying to brute-force the login ...