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

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6
votes
3answers
6k views

Find IP address of a device?

Open question: How to find the IP address of a device? As I understand, there are no guaranteed methods that work always, but there's a hundred approaches that work in specific situations, and I'd ...
4
votes
5answers
4k views

Best way to use large IP blacklist to deny access to a web server?

Is there efficient and easy way to use IP blacklist (like this one, but perhaps 2-3 times larger, which can't be simplified to CIDRs much) to deny access to a web server (either lighttpd or Apache) ...
3
votes
1answer
2k views

Public and private hosts in the same BIND zone

For my particular setup, I've got control of a BIND 9 zone file for, say, example.com. There are several hosts in this zone, such as www.example.com and mail.example.com. I want the public internet ...
2
votes
5answers
47k views

How to extend IP Range from 192.168.1.1 to 192.168.2.254

Here's my question. I currently have a network setup to have Static IP manually assigned between 192.168.1.1 and 192.168.1.99 and the rest (192.168.1.100 through 192.168.1.254) assigned automatically ...
6
votes
5answers
12k views

Specifing ip address for outbound connections on a multi ip host

one of my servers (Debian 5.0.6) has two public ip-address on the same interface. This used to work well for months but suddenly it is using "the wrong" ip addresses for outgoing connections. This is ...
6
votes
2answers
11k views

Debian/OVH: How to configure multiple Failover IP on the same Xen (Debian) Virtual Machine?

I have a problem on a Xen virtual machine (running latest Debian), when I try to configure a second failover IP address. OVH reports that my IP is misconfigured and they complaint they receive a ...
5
votes
3answers
20k views

Redirect request to an external IP to localhost (emulate a server)

I got an application (no source code) calling a server (hard coded IP) and expecting an answer before starting (a kind of login). Cause the server is down half of the time, I want to create a dummy ...
3
votes
2answers
4k views

IP Range for internal private IP of Amazon ELB

I'm trying to find out the range of IP addresses that an Elastic Load Balancer could have from an EC2 instance which is behind it. This is so I can configure the HttpRealIpModule of nginx correctly. ...
3
votes
2answers
2k views

Xen host and guest sharing same IP

Is it possible for both Xen host and Xen guest to share same IP (albeit with different ports)? We have a single public IP, and want to have both the Xen host (as host only, no other role) and the Xen ...
2
votes
2answers
2k views

Cisco Router - Website Doesn't Work Locally Because Public IP Directs to Router Itself!

I have an RV220W but this issue may apply to other Cisco routers. My website is deployed at public IP address 123.45.67.89/MyWebsite/Default.htm. My web server has an internal IP to which port ...
2
votes
3answers
9k views

Ubuntu only allow incoming access from 192.168.0.0/8 or server IP address

How can I make it that only approved IP addresses have access to my Ubuntu server 12.04 I only just set it up.
2
votes
2answers
2k views

Hazards of increasing network size by changing the netmask

We are running a small network with address range 192.168.0.0/24. So we only have 254 IPs available. We want to increase this range slightly, to allow more hosts in the network. So if I change the ...
0
votes
5answers
4k views

openVPN and multiple external IP addresses

I currently have an openVPN server with multiple external IP addresses. I'd like to have all VPN connections (tun0 interface, and/or 10.19.88.xx IP range) to take the 2nd external IP address as '...
0
votes
1answer
4k views

Multiple IP - different gateways - one interface - Debian Squeezy

i was reading many answers here and everywhere, but I cannot find the right one. I tried several solutions, but nothing works. I have a server with ONE Interface eth0. I have multiple IP's, but I ...
5
votes
2answers
7k views

OpenVPN: How to mitigate path MTU issues on a per-client basis?

We have dozens of embedded devices installed at customers, all calling home to our OpenVPN service. That works fine in general, but a few of our customers have severe path MTU issues. Our influence on ...
5
votes
5answers
3k views

hosting IP change, how much downtime to expect?

i'm moving my hosted site (same host) to a static IP, I understand there will be some downtime due to DNS caching - does anybody have any tips how to minimize this time and to avoid my users seeing "...
4
votes
3answers
20k views

Adding a second IP to Debian Server

I was given a second IP by my server provider. I am running Debian 5.0. I thought I knew how to add the IP to the system and configure with apache, but I have not yet been able to. The primary IP ...
3
votes
4answers
490 views

IP addresses and geographical locations

A colleague of mine asked whether IP addresses could be "approximated" to physical location. As with most IT questions, "it depends" was a response I used frequently. Is there a service or program ...
3
votes
1answer
2k views

iptables preroute localhost

I would like to forward all incoming traffic from a certain port to another one using iptables. The problem is that prerouting doesn't work for traffic from localhost. This topic suggests a solution: ...
3
votes
1answer
4k views

Can I redirect/route IP adress to another IP address (windows) [closed]

Can I map 146.112.61.106 IP address to my 127.0.0.1 adress ? so when I type 146.112.61.106 I got redirected to 127.0.0.1 ? (some netsh command maybe ?)
3
votes
2answers
619 views

Extending a subnet

We currently have a private IP subnet using the 192.168.1.0/24 range. We are running out of IP addresses and would like to extend this subnet, to something like 192.168.0.0/21. Is it possible to do ...
3
votes
3answers
3k views

How to enable IPv6 Autoconfiguration with static address in Linux (RHEL)

I have a static IPv6 address I would like to assign. When I add the address to the /etc/sysconfig/network-scripts/ifcfg-eth0 file and restart networking I realize I get several IPv6 addresses. The ...
2
votes
3answers
1k views

Resolve the same DNS name to different IPs depending on client IP network

Is it possible to setup DNS server (Win2k8) thus the same DNS name (an A record) is being resolved to different IPs depending on some option. E.g. example.com for clients from 192.168.0.0 to 192.168....
2
votes
3answers
3k views

Windows vista and 7 don't honor routing table metric?

I have the route table below on a Vista machine, I can see the same problem on Windows 7 too. If I ping 193.181.14.10, I would expect the OS to honor the metric and choose either 0.0.0.0 0....
2
votes
1answer
1k views

nginx don't log requests of a specific ip adress

I'm trying to don't log requests made from a specific ip address like this: location = / { index index.php; if ( $remote_addr = "spe.ci.fic.ip" ) { access_log off; } } But ...
1
vote
2answers
504 views

Forward all traffic on a specific port depending on the domain to another port

Imagine I have 10 different domains. All these domains have an A record to a single IP Address. There are ten different services hosted on this one IP. Let's assume they listen from port :80 to :90. ...
1
vote
1answer
4k views

Setting the IP address that the SMTP service uses in Windows Server 2008

My ASP.NET application running in IIS7 on Windows Server 2008 needs to send email. I added the SMTP feature to Windows Server 2008. The problem is that my server has multiple IP addresses and I don'...
1
vote
2answers
1k views

How do I do IP Failover for my Public IP address with Linux HA

I did a lot of experiment with heartbeat, corosync and pacemaker for IP FailOver which I have to do with Public IP. I did more than one ip failover(VIPs) with two nodes, also with three nodes BUT ...
0
votes
4answers
21k views

Finding the first and last address of a block of IP addresses with subnet mask

I am not sure if this is the right place to make this question but I thought this is one of the most appropriate SE's site to make a question on networking. Please move it to other more appropriate ...
0
votes
2answers
2k views

Dig vs Whois on Nameserver Update and Reference to Unknown FQDN?

After running a dig on an old domain name moved from an old server to a new one, completely different IP and provider, I ran a dig and found that the listed nameserver does not match the one in the ...
-1
votes
2answers
4k views

DNS simulation for testing purposes?

I'm wishing to simulate DNS for testing purposes, having decided to learn about it for if I was to go into webhosting. I've considered BIND (and tried setting it up), but that wasn't suited to my ...
-2
votes
3answers
1k views

D-Link Router “Virtual Servers” with 0.0.0.0 IPs [closed]

I recently erased all of the Virtual Server rules from a D-Link router and added just the ones that I needed (for example I don’t need DNS or NetMeeting, etc.) You can see the defaults on the emulator....
7
votes
8answers
11k views

Several IP address within the same subnet on the same host

Is it possible (well the real wording should be "Is it correct") to have several IP adresses that belongs to the same subnet, on the same host ? Here is an example: #Host 1 eth0 -> 10.0.0.1/24 ...
5
votes
2answers
532 views

Embedded device configured with bad IP address, can I still connect?

We have an embedded device running Linux (2.6.?) that can no longer be accessed over Ethernet. Someone in the field gave this device the following bad settings to its ethernet interface: IP: 172.16....
4
votes
2answers
4k views

Redirecting to the IP of an amazon EC2 instance

As you know amazon EC2 instances get an address like: ec2-72-44-40-153.z-2.compute-1.amazonaws.com If I have the domain example.com, is there any way that I can make bob.example.com or preferably ...
4
votes
4answers
8k views

Windows Server 2008 Ignores Persistent Route With Lower Metric

I have three Windows Web Server 2008 SP2 machines on a 10.100.20/24 subnet. I need to setup a persistent routing rule so that outgoing traffic to the same subnet goes through a hardware load balancing ...
4
votes
3answers
3k views

Are there simpler ways to do traffic shaping in linux besides tc?

I read lartc but I don't feel I need such a complicated solution for simple needs. One of such simple use cases is to limit a specific process' available bandwidth, upstream or downstream. How can I ...
4
votes
1answer
2k views

max number virtual IP addresses per NIC

How many virtual IP addresses are allowed to be added per network card? I am running a Linux OS.
3
votes
1answer
12k views

Why Are There Only 65,535 Ports, and Will We Ever Have More? [closed]

I understand the original reasoning behind having 65,535 ports per IP address: this is the highest number that can be represented by a 16-bit, or 2-byte, number, and it wasn't conceivable that ...
3
votes
1answer
2k views

DNS errors after changing nameservers for Cloudflare

I don't know if this is the right place for my question, but I have a problem with my DNS/nameservers after changing the nameservers. I'm not sure if it is a problem at my side or at my webhost. I ...
3
votes
1answer
6k views

Junos: find out each interface's ip

Sorry if my explanation is confusing. I need to get all the ip addresses of a Juniper Switch and Router (different models). On Cisco IOS I can get that with show ip interface brief | exclude ...
3
votes
2answers
1k views

Why is iptables not dropping packets?

I have the following rule in our iptables config file /etc/sysconfig/iptables -A INPUT -s 84.23.99.97 -j DROP And when I do iptables --list I get the following Chain INPUT (policy ACCEPT) target ...
3
votes
1answer
437 views

Does ESXi 5 have a “routed IP” feature like Xen?

I have a dedicated server that I would like to use ESXi 5 on. I previously had Xen and it worked great. Initial network configuration was a bit confusing. The problem I have is the hosting company ...
3
votes
8answers
3k views

Block spam by using geoip filter?

We are looking for a way to be able to block spam based on geographic location by filtering using geoip. context: we rarely have any email correspondence outside of the USA, so we would like to block ...
3
votes
1answer
2k views

Heartbeat Pacemaker 3 node/ip failover

I have setup two node active/active ip failover with heartbeat and pacemaker following the link at zivtech on the two load balancers for the backend web servers. Two LBs has public ip each which is ...
2
votes
1answer
5k views

Centos/OVH: public IP on KVM virtual machine

Since a few days, I'm trying to configure my KVM vm to have a public IP address, without any success. First, I'm on OVH, and you need to know they don't allow networking from different mac addresses. ...
2
votes
2answers
1k views

Multiple IP addresses assigned to one KVM VM

System: OS: Debian 6.0 64-bit with KVM installed from packages KVM is managed with Cloudmin 6.4.kvm I have a /29 subnet from my host. The bridge is setup properly for each VM to have its own IP, ...
2
votes
3answers
162 views

Webserver Hosting Location

We're entering into the european market and i have a question about hosting our .eu site. I know the IP address of the domain can affect SERPs, but I dont want to have a different server because it ...
2
votes
3answers
8k views

getting error “SIOCADDRT: File exists” when trying to restart network on ubuntu

Error/stdout /etc/init.d/networking restart * Reconfiguring network interfaces... SIOCADDRT: File exists Failed to bring up eth0. ...done. netstat -nr Kernel IP routing table Destination ...
2
votes
1answer
117 views

A local IP address (RFC 1918) on my network that is not … local

I've noticed an IP address today on my network (192.168.15.1) which when visited actually goes to a page that has a router webconfig page (Not my router) The puzzling thing is that i tried traceroute ...