Tagged Questions

2
votes
3answers
232 views

How is DHCP request message broadcasted?

The broadcast address of DHCP request message is 255.255.255.255. Will this request message go through routers? It seems to be yes as the destination address is 255.255.255.255. However, it does not ...
0
votes
0answers
37 views

How long does an assigned IP address from your broadband IP last and why? [closed]

For cable/FiOS or other "permanent" internet connections (i.e. not dial-up), how long does your IP address remain the same? Is there any published/known policy from an ISP that describes when and why ...
0
votes
1answer
129 views

Adding static DNS entries on a dynamic BIND setup

I've got a DNS (BIND9) and DHCP (ISC-DHCP-SERVER) setup in which the DHCP server dynamically updates the DNS when hosts grab an IP address. I'm currently resubnetting a portion of my network that's ...
0
votes
1answer
92 views

Assign multiple IP addresses in NAT mode to the same VM

I'm aware that VirtualBox assigns the same IP to different VMs (by default 10.0.2.15), however I have a case where I have a VM with a single vNIC, and a Linux namespace inside the VM attempts to get ...
1
vote
2answers
114 views

How can I configure ubuntu to have a static IP address but still use DHCP for other configuration information?

I want to use DHCP to pick up the network configuration information including DNS, but still assign a static IP address. On OS X, this is "Using DHCP with manual address", but I see no similar ...
2
votes
3answers
140 views

Detect alive IPs in an unknown static-IP based network

I ask just in case of curiosity and this is just an imaginary network Imagine an internal LAN network without any DHCP server implemented; So to access the network we should use static IP(s); But my ...
1
vote
1answer
443 views

dhcp same subnet different vlans

I want to setup my work's network so that all wireless clients get assigned a certain IP range but are on the same subnet as the other network devices. Currently I'm running dnsmasq for DHCP and DNS ...
1
vote
1answer
188 views

How to clean up IP's and prevent “ghost hosts” from claiming their IP address?

Background We have about 500 public IP addresses and is about to run dry. Most of the hosts are configured to get the IP from DHCP. But there some that was configured with static IP. The problem ...
5
votes
3answers
425 views

DHCP range starts with 194.77.30. Could that lead to problems?

Just noticed that our Lancom router has a DHCP range of 194.77.30.50 - 150. Could that lead to problems? Because sometimes some devices can’t be reached (with static IPS above that range like ...
1
vote
1answer
565 views

Machine name resolves to wrong IP

I have a machine called server1 (windows server 2008). It was initially set to have an automatically assigned IP by the DHCP server (windows server 2008). It assigned it 192.168.0.180. I changed ...
2
votes
3answers
357 views

Disable static IP addresses on desktop computers

Is there any way of not allowing users to statically set an IP address on their machines? We have a lot of servers with static IP addresses and also a DHCP server. I am afraid of allowing users to ...
0
votes
3answers
399 views

How to bind an IP to a specific switch port with DHCP

I have servers connected to multiple Juniper EX4200 based virtual chassis. In order to make them hot swappable without manual reconfiguration, I would like to be able to always give the same IP, with ...
0
votes
1answer
683 views

Event ID 10020 on my DHCP Server

Every time I restart my server (Windows Server 2008 R2 Enterprise) the following DCHP events appear with the ID 10020 in my event log. I have a static IPv6 address but this event is still being ...
-1
votes
2answers
247 views

DHCP for wireless, fixed for others [closed]

I've run into a situation where I need to have DHCP running for my wireless clients and fixed IPs for everything else. I have absolutely no idea how to do this, tried searching here on serverfault, ...
0
votes
1answer
56 views

Get IP-Adresse of bridged virtual machines

I'm using KVM with qemu/libvirtd for virtualization in my local network. Now I'm working on a script which should simplify the cloning and downloading process of virtual machines. For this I need to ...
0
votes
1answer
862 views

how to detect/Block duplicate/Static IP address on network

i have setup my network using pfsense, having 8 subnets, each one having their own DHCP server range. i have enabled STATIC ARP on the server and static MAC entries, so that no un-known machine can ...
0
votes
1answer
174 views

How to change my domain from 192.168.1.0/24 to 192.168.21.0/24

We are about to start using hosting service for the software we use and they've asked us to change it. I'm sure I can figure out how to change the DHCP scope, but that's not what I'm worried about. ...
1
vote
1answer
60 views

How to Lease a DHCP IP Address for X Number Of Days in Windows 2003 Machine

I have a numerous set of windows servers. The requirement of Fixed DHCP IP Address may vary for each server. One IT Guy may ask like i need this DHCP Address for 30 days and another may say i need it ...
1
vote
1answer
608 views

How do I wire a Windows network? Active Directory/DNS/DHCP Server

I am building a windows based network for my 'medium sized' business and I am only used to linux/mac networks. Any help is greatly appreciated! :) This is the setup I have: T1 from at&t, and a ...
0
votes
2answers
2k views

Hypercom Optimum T4220 POS Credit Card Terminal Fails ISP Test With Successful DHCP lease from a pfsense Netgate Appliance with static IP DSL WAN

This has been an ongoing issue for a couple of weeks. The credit card terminal will lose the ability to connect to the processor server over SSL. The IP config looks correct, the DHCP lease looks ...
0
votes
1answer
114 views

Assign IP to a VM from external DHCP server

When i install a new vm it fetches its IP from the DHCP server already setup when we install kvm. I am maintaining list of vm mac-addresses and there corresponding IPs (that should be assigned) in my ...
-1
votes
1answer
357 views

Why configuring manual IP do not work for me in DHCP? [closed]

I have broadband connection in my laptop. It's getting the IP by protocol. configuration is : ip : 192.168.1.2 subnet : 255.255.255.0 gateway : 192.168.1.1 Now I am curious, In IPV4 properties ...
0
votes
2answers
527 views

Assign a secondary IP address to a Windows machine using DHCP

Is it possible to configure dhcpd (on a Linux box) to assign a Windows PC 2 separate IP configurations? Right now I've configured the two IP addresses manually and it does exactly what's needed, but ...
0
votes
2answers
71 views

Strange IP address behavior

We are having a strange behavior on our company network. From time to time a IP that is given out by the DHCP server "stops" working externally, internal network access is working and DNS lockups is ...
1
vote
2answers
2k views

Why isn't my ip helper-address helping?

I have a hub site with a Cisco 2811 and several remote sites, running a mixture of Cisco 851 and 871 routers configured for site-to-site VPN. I am in the process of adding DHCP scopes and DNS zones ...
0
votes
5answers
2k views

Querying a DHCP server in C#

I have a really large network. Class A network and due to security reasons broadcast and any other PING has been blocked. I want to get all the PC IP that are alive. Is there any way to query DHCP ...
0
votes
4answers
1k views

PCs using certain IP addresses cannot ping out

I'm having a very strange problem which I just can't get past. The way our network is set up, we have 2 locations. The main office with all our PCs, and servers/ We are then joined to a local ISP ...
1
vote
4answers
145 views

Best way to script checking whether a machine is on the corporate network

I am writing a Powershell script to determine if a machine is on the corporate network. The machine may or may not be on the domain, so I want to check at "IP" level. Have written something to check ...
1
vote
3answers
373 views

How can order of IP addresses issued be controlled?

Every home router I've setup/used issues addresses from low to high. However, dhcpd from the Internet Systems Consortium seems to issue addresses in reverse order - ie, high to low. Is there a way ...
3
votes
2answers
327 views

IP assignment in small network

What is the best way to assign IPs in your opinion? I've got ~100 PCs, some servers and see three ways to assign IPs: Static IPs for every PC/server Static IP reservation by MAC-address in DHCP ...
0
votes
3answers
225 views

Proxy server as DHCP

I want to create proxy server which will give different users different ip's. Which instrument I can do it with? eth0 has many aliased ip adresses. Human connecting to the proxy(squid? 3proxy?) must ...
3
votes
5answers
360 views

Why is my eth0 getting a dynamic ip when it is configured to be static?

For some reason our office linux box is being assigned an ip address via dhcp and I don't know why. What is confusing to me is that when I check system-config-network it shows that my eth0 is setup ...
0
votes
2answers
674 views

Some XP clients intermittently getting wrong IP for STATIC IP Server

We have a server with a static IP, let's say x.x.2.5. We have several WinXP (but not all) that will occasionally resolve the hostname to x.x.1.59 (x.x.1.x is the local subnet). The DHCP range in the ...
-1
votes
2answers
279 views

VMWare fusion can't get IP [closed]

Whenever I start my VM (Server 2003), it fails to pick up an IP address. It doesn't matter whether it is bridged or host and affects more than one image. If I set a static IP in the image on the same ...
0
votes
2answers
358 views

DHCP IP address with a client specified DNS server? Is this against spec?

I have some embedded network devices that allow me to specify whether or not they use DHCP. Unfortunately, we have some clients that have less than stellar DNS servers in their networks and have ...
2
votes
5answers
9k 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 ...
0
votes
2answers
174 views

How to assign IP to physical machines?

Excuse my ignorance, I want to know if its possible to setup untangle in ESXI such that it will be able to assign IPs to physical machines outside the ESXI box. Here is my setup: 1) Management ...
0
votes
1answer
413 views

Configuring wireless network with multiple AP's

I have my primary router running ubuntu, which has been working fine for my basically very tiny large-scale setup (if that makes any sense at all). I got a handful of extra soho routers which I ...
0
votes
2answers
758 views

DNS servers not assigned by DHCP

I got working domain with DHCP, DNS servers installed and firewall ZyWall 5 which resolves names to internet. In DHCP server configuration I've set also static IP address of server as a primary DNS ...
12
votes
9answers
36k views

Any way to find unused IP addresses on my network?

How can I locate unused IP addresses on my network? The DHCP server keeps assigning the same address and I need a different IP address to test my application with. The software would need to run on ...
5
votes
7answers
3k 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 ...
4
votes
8answers
2k views

How do you keep track of which IP addresses are used on your network?

What tools are available for allocating and tracking which addresses are being used? Specifically, our issue is that sometimes an IP is taken for a VM and when we go to build new ones they're not ...