IP address is a numerical label assigned to each device participating in a computer network that uses IP for communication.

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0
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2answers
187 views

I've changed ISP, now www access to my website is not working, but HTTP is

I've inherited a company's IT position, so I was not in on the original configuration. We have recently changed our ISP (several months ago). Our Domain is hosted by Network Solutions and their A ...
1
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0answers
32 views

Ban IP doesn't work with forwarding [on hold]

I use à VPS like a bridge for an other server. I use apf-firewall and this file /etc/apf-firewall/preroute.rules for forward somme port one the other server. This is the end of the file: iptables ...
2
votes
3answers
128 views

Executing a software on another network interface?

I have created 3 virtual interface on a Linux system, using different IP address. I have a software doing requests to a server but it use the default interface, eth0. Is it possible to execute a ...
0
votes
1answer
17 views

How to eliminate Security Warning message on EC2 Instance wizard

I've set up the AWS Free Tier, and configured a Windows Server. I took the defaults pretty much. There was 1 security group it created with 3 security rules it provided by default, and I didn't ...
0
votes
2answers
1k views

adding 2nd private IP on AWS EC2 instance

I am having problems adding a 2nd IP on AWS EC2 instance. I am running Ubuntu 14.04. I already tried this: a) Right clicked the instance and added a 'private IP' from the manage Private IP. b) ...
0
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1answer
31 views

SSL connection to server ip address

I have a server which equipment at remote locations on private networks connect to via the internet using SSL. An SSL Certificate for the domain name of the server is installed. I have a number of ...
5
votes
6answers
1k views

I have a Cisco Catalyst 2940 and want to connect to it via the network. How to find its IP address?

Since my computer has not serial port, the serial cable is of no help. Does the Catalyst 2940 acquire an address via DHCP? At least my DHCP server doesn't show any address which has been requested ...
3
votes
2answers
605 views

Weird Requests Being Sent to My Server [duplicate]

I have written a server in C# for windows and it works fine. A week back I setup a dynamic domain name with No-Ip.com and now my server serves pages at the address nabeel.ddns.net. I was viewing my ...
1
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1answer
33 views

Select source IP on windows server 2012 with multiple IPs on 1 NIC

I have searched a lot for a solution to this case but I couldn't find any. So, any help would be appreciated. I have a windows server 2012 with 1 NIC having 2 IPs bound to it 37.188.120.8 and ...
0
votes
1answer
45 views

calculate reserved ip address based on mac address

Is it possible to calculate ip address based on mac address for isc-dhcp server? For example: 'aa:aa:aa:aa:aa:x' => '10.10.10.x' I have following in dhcpd.conf: subnet 10.10.10.0 netmask ...
0
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2answers
47 views

Http Requests: how to identify a machine using multiple IP addresses

I have an http server. Is it possible to identify a machine, which is making http requests to my http server using different IP addresses? In other words, is it possible to identify a machine, by ...
20
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11answers
25k views

Windows Server 2008: specifying the default IP address when NIC has multiple addresses

I have a Windows Server which has ~10 IP addresses statically bound. The problem is I don't know how to specify the default IP address. Sometimes when I assign a new address to the NIC, the default ...
0
votes
1answer
30 views

how to change the ftp passive mode ip address for haproxy work as reserve proxy?

I have an ftp server in LAN, address is 192.168.1.11 I used haproxy is because lots of other service need it I put haproxy on my 192.168.1.1 the same machine of our soft-route(ubuntu 14.04) My ...
3
votes
2answers
668 views

How to obtain incoming ip address from virtualbox

I setup a http server (apache) under VB and forward the port from the host using the available tool in VB. My VB network is NAT connected with the host. However when doing this the access log of http ...
1
vote
1answer
85 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 ...
1
vote
1answer
899 views

LAN->LAN IP translation (for TortoiseSVN + Artifacts + Buffalo router)

Here's my scenario: I've got a VisualSVN server on my main dev box @ home. I'm also using Visual Studio 2010, TortoiseSVN, VisualSVN client (for source control), and Versioned 'Artifacts' (for bug ...
14
votes
17answers
42k views

Shell Command for Getting IP Address?

Is there a bash command to find the IP address for an Ubuntu box? I need to find the IP address so I can ssh into the machine later.
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votes
2answers
47 views

how to change the special port output source address?

I want to change the my datapackage from port 25 to another internal address(192.168.2.253). iptables -A OUTPUT -o em1 -p tcp --dport 25 -j SNAT --to 192.168.2.253 But I get the output is: ...
0
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0answers
30 views

How can you calculate IP address subnet ranges? [duplicate]

If you're given: Number of needed subnets: 2 Network Address: 195.223.50.0 I can answer the following: Address Class: C Default Subnet Mask: 255.255.255.0 Custom Subnet Mask: 255.255.255.192 ...
1
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1answer
28 views

One SSL certificate for load balancing amazon instances

As the title says I want to have one SSL certificate for multiple instances in amazon AWS. The multiple instances are connected to the internet through an load balancer. To make an SSL certificate and ...
8
votes
4answers
12k views

Block range of IP Addresses

I am getting bombarded with attempted hacks from China all with similar IPs. How would I block the IP range with something like 116.10.191.* etc. I am running Ubuntu Server 13.10. The current line ...
6
votes
7answers
4k views

Static IP Address assignment vs DHCP address assignment

I manage a small-ish network that consists of less than 70 nodes. The previous system administrators opted to have a dhcp server and manually set dhcp addess. I have opted to rather use dhcp ...
3
votes
4answers
14k views

Can I use nmap to discover IPs and mac addresses?

When I need to locate the IPs of devices by their mac address on a Windows system, I normally use Advanced IP Scanner (from radmin.com) to scan the network, then I use arp -a to list the mac ...
0
votes
4answers
8k 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 ...
1
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1answer
564 views

Plesk 10 Postfix with multiple IP adresses and SSL certificates [closed]

We are currently running a root server with Debian 6 and Plesk 10.4.4. We have some virtual hosts using one IP adress (shared) - e.g. example1.com - and another virtual host using a dedicated IP ...
7
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4answers
1k views

CIDR Ranges for Everything except RFC1918

I'm looking for a list of CIDR blocks for "The Internet", i.e. everything from 0.0.0.0 to 223.255.255.255, excluding RFC1918 address space of 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 (yes, I know ...
0
votes
0answers
29 views

L2TP daemon server multiple IP

I have VPS with 3 public IP - Debian 7. I would like to have 3 L2TP damemons (one ip each) NATing traffic to each ip. Something like this l2tp_multiple_public_ip_diagram. I have set up l2tp daemon for ...
3
votes
10answers
9k views

Use first or last free IP for the default gateway?

Please assume a simple LAN on 192.168.100.0/24. Would you configure the default router on 192.168.100.1 or 192.168.100.254 and why? Thanks
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votes
1answer
32 views

IP address detection through firewall [closed]

Suppose my computer connections are filtered by a firewall on which I have no information and no control. Will the administrators of the network will know which websites I did visit thanks to their ...
-1
votes
2answers
99 views

How to detect proxy server address? [closed]

My computer is controlled by a proxy server. How can I detect its name/IP address ? I would love to know if there any command lines (on Windows) to do that. Thank you in advance.
0
votes
1answer
36 views

Windows Server 2012 R2 - Email server's external IP address when the Azure VM starts

I have been trying to setup a task in the task scheduler that sends an email to me when the server starts. The email should contain the external IP address of the azure virtual machine. What should ...
2
votes
4answers
1k views

Why is this China IP hitting my web site?

I have a web site that uses a couple hundred domain aliases, including franchise-dallas.info, franchise-delaware.info, and detroitfranchise.info (see more below). I have been getting ten to twenty ...
-1
votes
1answer
167 views

Whitelist Elastic Load Balancer based on IP [closed]

I'm serving HTTP traffic on port 80 through an ELB. Since a short time, a growing amount of clients are asking me what our IP addresses are (to harvest data). Apparently they can't whitelist the DNS ...
52
votes
6answers
5k views

Why can't MX records point to an IP address?

I understand you should not point a MX record at an IP address directly, but should instead point it to an A record, which, in turns, points to the IP address of your mail server. But, in principle, ...
2
votes
1answer
653 views

IIS 7: Disable authentication for certain client IPs

I have a virtual directory that's protected with basic authentication. I'd like to disable authentication for certain IPs, so that all requests from e.g. 127.0.0.1 are allowed without asking for ...
0
votes
1answer
34 views

Virtualbox Appliance: Maintain same Private IP as used with Vagrant

I have an OVA which I created in conjunction with Vagrant. I want to distribute the OVA, but when people start it up I want to have the same Private IP address assigned by Vagrant. So far I've had ...
33
votes
5answers
4k views

Is it valid to have part of an IPv4 address set to zero?

I am working on a change in a Java EE application that would authenticate based on the user's IP address using ServletRequest.getRemoteAddr. We store IP address ranges (FROM_IP and TO_IP) in a ...
0
votes
1answer
79 views

Secondary IPs on DMZ machines not working

I am moving some virtual machines from my DMZ in a bladecenter over to my new cisco UCS. We are using Hyper-V, and are running Server 2012 on the old bladecenter, and Server 2012r2 on the new UCS. ...
10
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6answers
97k views

Get IP addresses and Computer Names in the Same Network

What is the command that can be used to get the IP address and the names of the computers that are located in the same network? I am running Windows
29
votes
5answers
3k views

Is 0.1.2.3 a valid IP address?

Are IP addresses with all zeroes in the first octet valid? For example, can 0.1.2.0/24 be a valid subnet, with network address 0.1.2.0, broadcast address 0.1.2.255 and an usable address range from ...
1
vote
3answers
2k views

Ubuntu iptables allow certian IP addresses

I have a riak cluster that I need to only allow certain IP addresses access to the information. I am currently using, -A INPUT -s 192.168.10.200 -j ACCEPT, to allow this IP address and at the bottom ...
-1
votes
1answer
134 views

Can 192.168.20.4/24 describe a network or only a host? [duplicate]

As I understand it IP 192.168.20.4/24 can only describe a host (24) on net 192.168.20.[1-254]. Now when describing a net; can 192.168.20.4/24 be a valid network ID, or should such a network ID always ...
6
votes
5answers
4k views

Making iptables easier to maintain

My network is completely locked down except for a few sites which are whitelisted. This is all done through iptables, which looks something like this: # Allow traffic to google.com iptables -A ...
79
votes
4answers
86k views

What's the difference between ip address 0.0.0.0 and 127.0.0.1?

I do know that 127.0.0.1 ~ 127.255.255.254 are the loopback IP addresses for most modern operating systems and we could use these IP addresses to refer to our own computer. But what's 0.0.0.0? It ...
-1
votes
2answers
98 views

Do mobile devices have unique IP addresses? [closed]

I have a REST web service that contains a method for sending SMS messages, I would like to ensure that this functionality can only be executed every 10 seconds by any given user. Do mobile devices ...
2
votes
4answers
3k views

What could prevent one Amazon EC2 instance from pinging another instance's Private IP?

I have multiple Amazon EC2 instances which need to communicate using private IPs. However, so far I've been unable to ping one instance's private IP from another instance. I can ping external ...
1
vote
1answer
78 views

Apache Server: IP Address Routes to Domain Instead of DocumentRoot

I have only one website in my server. My desire is to open different directory when the IP address is used as the URL in web browser. However, even though I set the DocumentRoot to a different ...
1
vote
6answers
4k views

How to list all the ip addresses of a server

When I type ifconfig, I see that my server has an new ip address each day. The ip addresses belong to a set of ip addresses. How do I find out all the ip addresses of my server?
-1
votes
1answer
76 views

Is it Possible to Capture All HTTP Packets to a Target IP on a subnet?

I've been trying to use tcpdump to capture packets to a target IP on my subnet, but am unable to do so successfully. I've tried: tcpdump -i eth0 net network-ip-address/27 -A and tcp port 80 But it ...
0
votes
1answer
32 views

Switching network from netmask 24 to 22

I currently have a firewall set up as x.x.1.1 and a secondary of x.x.2.1 on the firewall. On the DHCP server I have a superscope with 2 scopes handing out DHCP addresses. I was told it would be best ...