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

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1answer
129 views

How to allow only subnet for port with iptables

What i am trying to do is to DROP any packets to specific UDP port, except those one from my secured subnet 10.8.0.0/24. iptables -t nat -A --src 10.8.0.0/24 -p udp --destination-port 63210 -j ACCEPT ...
0
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0answers
331 views

FortiGate 310B public ip pool into internal port

I have a FortiGate 310B with WAN port with /27 public IP pool from the ISP. The WAN port is configured with primary IP 1.1.1.1/27 I would like to provide servers within the Internal port a public IP. ...
6
votes
2answers
384 views

Failed SPF for email imported to Gmail because of client IP instead of server's in message when sent through SMTP from one local box to another

We have a linux (Debian) VPS with domain (let's say example.com with MX mail.example.com) that has SPF set up. There is dovecot+exim running. There is also Direct Admin on top of that. When I send a ...
0
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0answers
203 views

ClearOS route configuration not working. How to setup route-eth0 properly?

I am running a ProxMox Server with ClearOS as a VM. I have the following requirements: extIP 1.1.1.1 gateway 2.2.2.2 I can not get clearos to automatically add the required routes. Here is what my ...
1
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2answers
89 views

Send PHP requests from dedicated IP instead of shared IP [closed]

I have set a dedicated IP for a website (using directadmin), but all outgoing php requests are sent from the server's shared IP. Result of the following code is always the shared IP. $a = ...
1
vote
1answer
123 views

What is “the meaning” of this `ip route`?

I'm slowly learning more about IP routing and the ip toolset by investigating a VPN. After I start a particular VPN client, one of the (new) routes displayed by ip route show is 128.0.0.0/1 via ...
0
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1answer
89 views

Linux route cache seems to load outdated settings

On SLES 11 SP3 (Kernel 3.0.101-0.46) I see the following route behavior: When I set a route specific MTU once via ip route change ... mtu lock 1500, everything works as expected (setting an MTU of ...
1
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2answers
143 views

Linux: How to get a machine's IP address? [duplicate]

I'm using Linux CentOS 6.4 . I'm writing a shell script and I need to extract a machine's IP in order to use it in the script. How can I find the machine's IP? I'm looking for the "best" way because ...
-1
votes
1answer
267 views

assign Second IP in ESXi 5.5 host Centos 6.6

Hello i have just installed CenOSs 6.6 on ESXi 5.5 and I have eth0 working fine. I have internet access and I want to assign a second IP in CentOS. So purchased another ip from oneprovider.com and ...
-1
votes
2answers
176 views

How to null route a dns zone [closed]

I have a domain that was attacked and flooding the server apache system. The only way to detour the attack is to reroute the dns off the server. Is there a generic IP like "127.0.0.1" that I can use ...
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votes
3answers
49 views

How do I know the type of connection from the IP Address? [closed]

The website GameFAQs uses the IP Address to know the type of connection and decide the level of a new user. See image: http://i.imgur.com/ZfJK8JH.png How does it determine the type of connection ...
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votes
1answer
134 views

What cause this error? [closed]

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 ...
0
votes
2answers
82 views

IP Address reassignation (unused Ip address)

Available IPv4 address blocks are exhausted and price per IPv4 address is increasing. However I read that 2/3 of IP address remains unused because they were assigned improperly at first stages. Since ...
-3
votes
1answer
34 views

Is a DNS Lookup performed in this case?

Sorry for this noob question in advance :-) When I enter a dedicated IP of a web server in the browser instead of a domain name, then as far as I know my computer does not need to perform a DNS ...
0
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4answers
78 views

Fault tolerance by using two IP with two interfaces

I would like to have a fault-tolerant setup for http requests. For brevity, let's assume we have a very simple Web-service and there is no difference which server responses. So I will have the ...
1
vote
1answer
149 views

Can't reach iis server via external ip

I am using aws from amazon and I have iis intalled on my server. I have created a test site but I can't reach it using external ip address. It is only reachable throught http://localhost- and ...
-3
votes
1answer
80 views

First Reply on Ping is Unreachable the rest is okay [closed]

please check this weird ping i'm having What may have caused this problem
-1
votes
1answer
37 views

Why can't I see public ip on my cloud server? [closed]

I have recently applied for a cloud-based server. I am not very experienced in system admin. So pardon me if this is silly. I was using ifconfig command to view available network interface. But I ...
-1
votes
1answer
98 views

Transfer IP address while Server Migration [closed]

I have to migrate my websites from server A to server B. Server A (213.171.207.165) I have 3 websites running on server A website1.com (213.171.207.235) website2.co.uk (213.171.207.245) website3.ae ...
-1
votes
1answer
84 views

Route port forward through 2 windows server 2008R2 network adapters to another network

our phone system at work is on a separate network to everything else and I need to forward a port from our gateway to it to allow our phone tech to remotely administer it. I have plugged the phone ...
0
votes
1answer
84 views

IP as a method of access control? (IP Spoofing possibilities)

I'm currently investigating the use of IP addresses as a form of access control: for example, only allowing access to an Apache VirtualHost if the request originates from a specific IP address or ...
31
votes
4answers
8k views

Users with Google's IP address. How is it possible?

I have a spanish website and I do not allow people from non-european countries to register and to login. Some time ago I started to receive messages from users who can not login. When I ask for their ...
0
votes
1answer
354 views

Restrict outgoing network traffic by domain name (Linux)

My root goal is to be able to prevent attackers from making unauthorised outgoing connections on my server (e.g. for connect-back shells). I can achieve this by blocking all ports for outgoing ...
-1
votes
1answer
42 views

company computers with proxy but no gateway?

Can I safely assume that client computers in my customers environment do have a configured gateway (whether static or DHCP)? It looks obvious but I wonder if this scenario is realistic: In corporate ...
0
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1answer
191 views

Unbound DNS: How to get source IP address from python mod

I use Unbound DNS with a custom python module. Based on who sends a query, I want to return different results. How do I get the Source IP from the Python module?
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votes
2answers
190 views

TTL in ping vs dig

When I ran ping google.com, I get a ttl value of 55: 64 bytes from 173.194.127.103: icmp_seq=68 ttl=55 time=16.4 ms When I ran dig google.com @ns1.google.com., it get a TTL value of 300. ...
0
votes
2answers
168 views

Ubuntu 14.04, setup server IP for datacenter, IPMI

i'm going to build a server and send it to a datacenter. I got this from the datacenter. They told me to setup the server with it. VLAN: 256 IPv4: 79.133.49.168/29 IPv6: 2a01:07e0:0000:0256::/64 ...
-6
votes
1answer
100 views

Get a static internet ip address [closed]

Whenever my router goes off my IP gets constantly changed, which is not favourable when running an online service. How can I prevent this from happening?
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votes
2answers
1k views

How to generate a Self Signed SSL Certificate bound to IP address? [duplicate]

I have my application hosted in the cloud and while demoing to prospective clients, I would like to make sure that my browser doesn't complain due to the lack of trust. So I want to generate a self ...
2
votes
1answer
89 views

Difference between ip link eth down and ip link dev eth down

What's the difference between ip link set eth0 down and ip link set dev eth0 down ? The difference between the commands does not appear to be documented anywhere.
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0answers
18 views

Is there an easy way to monitor another domain user's processes and IPs these processes are contacting? [duplicate]

Is there a way to monitor which IPs the startup processes of another domain computer is contacting as a user logs in? Both person logging in and person who will be monitoring are domain admins. Short ...
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votes
1answer
72 views

Is there a Universal/Generic Default Gateway Address in IPv4? [closed]

Is there a universal and/or generic default gateway address in IPv4? I'm looking for something similar to the way you can always reference a NICs IP address from itself with 127.0.0.1 regardless of ...
0
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0answers
185 views

Does netfilter reassemble IP fragments when packet is forwarded?

IP datagram should be reassemble in the termination of the path because the fragments may arrive from different paths. I think Netfilter need to reassemble a IP datagram to inspect the whole payload ...
0
votes
2answers
81 views

Private Network Interface between to MacOSX servers

We would like to set up and private single cable connection between two Mavericks servers, that also need to talk to the rest-of-the-world. The two servers for sake of argument are DB and Web. There ...
0
votes
1answer
52 views

Is there any solution to change the source IP from outgoing WAN A to receiving WAN B?

I am configuring a office router for crossing the GFW in China. I want to use WAN A(actually a low bandwidth VPN tunnel) only to send package to target servers (YouTube for example). And change the ...
0
votes
1answer
40 views

IP route not on default gateway

I am trying to setup a network that is only accessible if you go through the '10.222.3.1' switch. It is a test environment that we do not want interfering with our production environment. The trouble ...
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votes
5answers
287 views

What happens if ISPs mess up IP allocation?

I've been wondering about this for a long time but never really got around to asking it. I know that a lot of companies were initially assigned IP addresses within the /8 (Class A) range and a lot ...
0
votes
1answer
45 views

Telnet, Startech, and a Transmitter

I'm at a bit of a loss and will also preface by saying that I have very little experience working with Telnet. I have Startech Serial over IP 'webserver' setup, everything seems fine on this end. Next ...
0
votes
1answer
93 views

Connect remotely to an APIPA assigned host

I had the unfortunate (and not correctly planned) event of having one of my remote Hyper-V hosts assigned an APIPA address hence i cannot connect by any means on it. Funny thing is, i can RDP to the ...
-1
votes
1answer
57 views

AWS Multiple Elastic IPs to one instance

I need some guide to lead me to setup multiple (6) ips for 6 websites (1 ip - 1 website) on one instance. or what to look for I have found this http://www.ec2instances.info/ If it is true I need t2 ...
0
votes
1answer
136 views

Postfix configure a gateway to outbound emails

I have a server configured with Postfix in my business office. I have another server at a hosting provider that I want to send all my outbound mail through. How can I do this. The only way I know its ...
0
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0answers
94 views

opensm infiniband route table

I have two centos 6.6 vmware vms. VMware is told to do a bridged network and to replicate physical network. eth2 is dhcp managed by NetworkManager. I am able to get to the point where I can assign ips ...
0
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0answers
31 views

Support for UDP-Lite

In order to be effective, UDP-Lite requires the link layer to disable its frame CRC check for frames carrying UDP-Lite packets. Are there any deployed link layers (Wifi?) that implement this explicit ...
2
votes
2answers
1k views

Windows firewall, netsh, block all ips from a text file

am using the following scrip to block ip's from a text file into the windows firewall. I'm using windows 2008 R2 @echo off if "%1"=="list" ( netsh advfirewall firewall show rule Blockit | ...
0
votes
1answer
172 views

Redirect subdomain to an Apache Virtual Host

I have a website "example.com" hosted on a provider that allows me to manage my own DNS. I want example.com to point to the provider's IP address but I want "subdomain.example.com" to point on my own ...
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votes
1answer
28 views

is host id size of IP address will vary between the private and public networks? [duplicate]

I understood that size of host id in the class c network is 8 bits(1 Octet) Classful network After started exploring about private networks, in the below link Private network The host id size of ...
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votes
2answers
45 views

Call a server Ip simulating domain name [closed]

in order to migrate my domain name to my new server, I would like to test it with real domain name. I think we can call Ip server giving as argument domain name ? How can I do that ? Something like ...
0
votes
2answers
950 views

Apache module RPAF documentation? [closed]

I installed libapache2-mod-rpaf package on Debian because mod_remoteip seems not available. I cannot find any documentation about this module. I found a github repo but the configuration options are ...
1
vote
2answers
288 views

How is a TCP request routed from a virtual machine to an outside resource and back again?

Scenario: Computer A has a local ip of 192.168.1.100, which is running a VM inside of it. The VM now makes a tcp request to an external IP address (74.125.225.98). Could someone explain how the ...
2
votes
2answers
661 views

Assign multiple IP and Gateway in Ubuntu Server

I'm trying to find an option to add/assign multiple IP addresses and Gateways to the Ubuntu Server. The reason behind is, I want to access devices from two different networks. For instance I may want ...