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

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Cisco 2901 Inbound NAT with local IP overload

Overview We are replacing a Juniper SSG on one of our networks with a Cisco 2901. Everything has so far been quite smooth except some issues have come up with external ports needing to be opened. ...
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1answer
76 views

Does the IP -> Ethernet multicast address mapping ambiguity matter for IGMP snooping switches?

There are 2^28 possible IP multicast addresses, but only 2^23 possible Ethernet (MAC) multicast addresses (http://technet.microsoft.com/en-us/library/cc957928.aspx), which is why e.g. 224.1.1.1 gets ...
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2answers
168 views

Reverse proxy on ALL ports, not just http?

Hello I recently asked a question about running multiple websites on different servers on the same network here multiple servers running the same thing, how? I have researched about setting up a ...
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1answer
57 views

multiple servers running the same thing, how? [closed]

I have a little issue that I don't understand well enough to answer myself. Basically I have some servers on my home network, I am wondering how 2 servers could run something, lets say apache in this ...
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1answer
63 views

Do anycast addresses imply IPv6? [closed]

From what I understand, as a random user on the Internet, you cannot really know if an IPv4 address is unicast or anycast. However if you ping that IPv4 from two hosts physically located on two ...
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2answers
2k 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 ...
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1answer
515 views

blocking ip on linux(CENTOS) [closed]

I m blocking an ip from my centos server using iptables: iptables -A INPUT -s $ip -j DROP service iptables save however my ip is still able to access the ip and even view websites hosted on this ...
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1answer
1k views

Is it possible to configure a reverse VPN tunnel?

Basically, my goal is to have a 100% portable and independent server. I'm building it using a Raspberry Pi powered by solar panels and batteries, and it is to be connected to the internet using a 4g ...
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2answers
647 views

Should my DNS server and DHCP server have the same IP address? [closed]

trying to resolve a 'Server not Found' error message. If I reload the page a few times it works.. So I went to the Event Viewer and saw my DNS timed out, went to CMD did the ol' ipconfig /all to see ...
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2answers
83 views

Difference Between Netstat and Access Log

When I was checking stats in SSH terminal for my VPS, I noticed that netstat and access log gives different results. When I used: netstat -anp I saw that one attacker having 32 concurrent ...
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1answer
84 views

Detect IP blocking or blacklisting

Unable to access a cloud server (Windows) from a particular public IP provided by the ISP. Tried to PING, tracert, telnet everything, nothing worked. No deny rule mentioned in the firewall. Properly ...
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0answers
119 views

DD-WRT OpenVPN Client Router not routing

I have been trying all weekend to solve this and unfortunately no success. I have a DD-WRT installed router, which is intended to be a gateway or tunnel to an OpenVPN server via the internet with the ...
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1answer
58 views

flushed IPs by mistake on UNIX how to recover from rescue

I got a problem. OS: Linux Debian 6.0 64-Bit I used this command on my root-server: ip addr flush dev eth0 I added some month agp multiply IP's and that in a false format. The problem is since i ...
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2answers
1k views

Using multiple “myhostname” in postfix

Does postfix allow to dynamically change "myhostname" ? I rtfmed a lot but did not found anything qualitative. My installation is a postfix multiple domain, multiple ip (tweaked in master.cf) and ...
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1answer
46 views

What happens when a static IP address is unavailable? [closed]

I have several Raspberry Pis configured with static IP addresses (192.168.1.203 being one of them). I swapped out the router yesterday, and this router is using a different IP scheme (192.168.178.*), ...
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2answers
135 views

DHCP server - No IP for computers out of the domain

I would like to know if there is a way to deny leasing an IP address through my MS DHCP server to computers which are not registered in my domain. Thanks!
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0answers
43 views

Cisco ASA5505 Public IP Address

I am trying to configure a Cisco ASA5505. I am using the GUI start up wizard. When I assign the outside IP address to be a public IP address the configuration will work but after about 30 seconds the ...
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1answer
383 views

iptable CLUSTERIP doesn't work

We have some requirements which explained here. We tried to satisfy them without any success as described. Here is the brief information: Here are requirements: High Availability Load Balancing ...
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2answers
302 views

Block incoming traffic from unresolved IP address

How can I block all the incoming traffic from unresolved IP addresses? I am using CentOS with WHM/cPanel installed. I am getting huge junk traffic and 95% is from unresolved IP addresses and only 5% ...
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2answers
343 views

RV042. Public IP on LAN port. Is it possible?

I have a RV042 router with a public static IP (XXX.XXX.XXX.42) and 4 LAN ports assigned to net 192.168.1.0/24. Can I connect a host to one of the LAN ports and assign it a public static IP ...
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1answer
228 views

One Public IP, Private IPs, DNS Server and Multiple Servers [closed]

I have lots of unanswered questions about these topics. So, lets begin. First off all, I'm not a server and networking guru. I'm a regular PHP developer. And I've read allmost all of the articles ...
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2answers
419 views

SSH into EC2 with dynamic public IP address

Typically I set ssh aliases as follows: ssh -i ~/path/key.pem ubuntu@public-host-name.compute-x.amazonaws.com But with EC2 instances, the public-host-name changes whenever an instance is stopped and ...
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3answers
274 views

Is it possible to transfer an IP address from one host to another?

I have a client that created over 600+ websites whose DNS records point to an actual IP address and not name servers. They are looking to move from their current host and do not want to lose their IP ...
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0answers
181 views

Private nameserver IP [closed]

I am working on a VPS. The server we are using was installed with WHM Accelerated and CPanel, the option we selected for DNS was BIND. When I came to updating the Nameservers on the Domain ...
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0answers
392 views

Unable to communicate with web proxy server on iOS

I am following the instructions on how to use a HTTP proxy with an iPhone, however I appear unable to communicate with the HTTP proxy. I have configured the settings in my phone correctly to use the ...
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1answer
50 views

Limit on IPs assigned to one interface

I have a unique application where I need to use many IPs on one server. Will Ubuntu networking crash if I assign 2048 IPs to one eth0 interface?
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1answer
40 views

Mod Security2 deactivation rule only from a specified IP addresses

Is it possible to disable a rule by Mod Security2, only for one specified IP addresses? Only for one specified IP addresses & only for one specified path ( /administrator ) ? I tried this: ...
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5answers
2k views

Can I have my DNS server and my web server on the same IP? [closed]

I just bought a raspberry pi and made it a web server. I have a network with 1 IP. I created a DMZ and I am able to access my raspberry pi web server from the internet. I bought a domain that I intend ...
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1answer
22 views

Windows Server | firewalling remote connections

In my windows server 2012, In the firewall rule for remote desktop connections I have added so that only MY IP address is allowed to connect, now of course I have taken a precaution and added a ...
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3answers
54 views

Determine if IPs are backed by VPS

Is there any way to determine if IPs are backed by actual VPSes? For example, a VPS host receives a /22 block of IPs. He puts them on his server and requests more, but you want to verify that each IP ...
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1answer
46 views

How do I access a site by IP on a CentOS server [closed]

I have a CentOS 6.3 server, running Apache and have DirectAdmin installed. I have created what will be a new domain, but I do not have a domain name yet. For now I have created, lets say, ...
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1answer
61 views

Limit Emails Per Hour Per IP [closed]

Anyone knows a script or software for CentOS and Windows that can be installed onto dedicated servers with no control panel limiting emails per hour per IP or full block. Thanks in advanced!
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2answers
1k views

CentOS: Can't add route after deleting the /24 rule from main routing table

As the title says, after deleting a rule from the main routing able I am not able to add any route till I do service network restart or ifup eth0 To reproduce the problem: ip route list table ...
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1answer
45 views

Website getting reply from old ip

I have changed a DNS entry (A record) in my AD server for a website address. But I was not able to browse the site after that. When I tried pinging and nslookup, I could find the web address getting ...
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1answer
66 views

Windows Remote Desktop Connection

I have a Windows Server 2012 and I can currently connect to it via the built-in Windows remote desktop software. I enter the server IP and password and all is fine. However, I was wondering what I ...
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1answer
36 views

send udp packets to a destination via forwarding

i have linux machine A ( 128.247.19.194, netmask 255.255.254.0) linux machine B ( 128.247.19.165 netmask 255.255.254.0) And another linux machine (128.247.19.3 netmask 255.255.254.0) There is a ...
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2answers
90 views

Connect two servers with RJ-45 cable and iptables (without switch!)

I have two servers and server_1 is connected to INTERNET port (of server farm) at eth0. No switch. They connected with cable from (server_1)eth1 -> (server_2)eth0 : ifconfig of (server_1): eth0 ...
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3answers
166 views

Determine if an IP is from hosting provider, or normal ISP? [closed]

I know this problem is not fully answerable, and will probably never be 100% solvable. But I am looking for ways/techniques to determine if an IP is belongs to a normal home/business user, going ...
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2answers
126 views

Web service listen on Public and Private IP address

I'm trying to get some applications of ours to listen on the Public IP address of the server. Due to the complex nature of these systems we cannot change the behavior of the applications or what IP ...
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1answer
621 views

How would I create a IP whitelist for tomcat?

I'm extremely new to tomcat but I need to configure my company's tomcat server so that we can allow restricted IP addresses only. I understand this is normally the job of the firewall but in this ...
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1answer
206 views

DNS and IP Configuration for Windows Server 2012 DC

I am getting these errors: SERVER Error DNS: DNS servers on vEthernet (Intel(R) 82567V-2 Gigabit Network Connection - Virtual Switch) should include the loopback address, but not as the first ...
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1answer
119 views

Proxy / IP clouds, how do companies acquire them?

I have seen a number of companies providing proxy clouds or IP clouds, whereby each of your web requests ultimately goes out through a random IP/proxy. You send your request to their IP and they ...
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2answers
114 views

Socks proxies over SSH show same IP

I have recently been setting up proxies via SSH on my VPS and when I connect the non main IP via a browser and look at my IP, it shows up as the main IP, is there any way i can fix this? For example, ...
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1answer
68 views

One Domain, One publish IP, Multiple servers

Apologies in advance for being a total newbie with all things infrastructure related. A little background: I'm developing a server app for an Android application. The app will communicate with the ...
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1answer
66 views

Multiple IP's per domain name and route to fastest available server?

I'm not very familiar with NameServers. Where can I find information or how can I set up multiple servers with different IP's to use the same domain name, such that the client connects to the ...
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0answers
49 views

KVM Networking guest issue due a provider networking limit

I have a KVM setup on Centos 6.4 64 Bits. My server provider assign us a Main IP to the Host with a gateway and netmask. Also our provider assign us additionals IP ( not in the same block as the Main ...
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2answers
48 views

Assign IPs to programs/processes

I need to assign different IP addresses to different processes (mostly PHP & Ruby programs) running on my Linux server. They will be making queries to various servers, including the situation ...
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2answers
69 views

What is this router's IP address(es)? [closed]

What is the IP address(es) of the router in my picture? In my picture, you can see that I have question marks next to the router's interfaces, because I'm not sure if those are right. Can someone ...
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2answers
65 views

Do orgs that own IP blocks even use all (or most) of it? [closed]

I recently learned that the IANA assigns blocks of IP addresses to certain entities, usually commercial and government organizations. Here is a link to the assignments: ...
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4answers
85 views

Cannot access IP address on server after 3 days of waiting

A client of mine who hosts their websites with Hurricane Electric added a dedicated IP address to 2 of their accounts, three days ago. However, I am unable to work on their website as the dedicated ...