Dynamic Host Configuration Protocol (DHCP) allows computers on the same network to automatically obtain a unique IP address.

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DHCP Renew on FW restores Internet Connection - why?

Home network, Cisco ASA 5505 9.0(1), Windows Server 2008 R2 (actually SBS 2011), various Mac, Windows and embedded clients. ISP is Rochester, NY Road Runner. Often (2-3x per day) my embedded devices ...
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3answers
212 views

Router behind switch in my home office will not pull up a dynamic IP from my service provider

I have the following setup in my home office: Fiber-optic service from my service provider passes through the service provider's ONT in the basement and into my apartment via an Ethernet cable ...
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2answers
295 views

2 DHCP servers on the same network

Riddle me this: A BT Quantum Phone system has a built in web server for administration and configuration. However it also contains a DHCP server that cannot be turned off and a static IP address that ...
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2answers
224 views

Get new IP from changed DHCP server

If changing the DSL router within my network (e.g., because it is damaged or failover to an UMTS-modem happened) it also changes the DHCP server with it. So all connected clients need to fetch a new ...
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2answers
298 views

All statically assigned addresses, but dhcpcd still runs?

I have a VM (on ESXi 5.1.0) running Debian Wheezy (7.0). eth0 has a statically assigned address. eth1 was DHCP-assigned, and now I want to make it static. Here is my old /etc/network/interfaces: # ...
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2answers
449 views

Automatize static and DHCP switch

Is it possible to automatize switching the DHCP and Static IP usage for a specified interface in win7? I got AP connected to an other and when the other ap goes offline mine don't give to my PC IP ...
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87 views

Internet cuts out and cannot reconnect, DHCP not enabled

Sometimes the internet cuts out and then when I try to reestablish a connection it gives me limited connectivity where I can't access anything. The network problem diagnostic tool can repair the ...
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3answers
8k views

How to assign multiple IP addresses to a single computer?

The dhcp ip range is 192.168.0.255/24. I wanted my computer to get multiple ip addresses from this dhcp. So I can have multiple connections through different ip addresses with just a single computer! ...
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11k views

Wrong IP address when pinged from another machine?

I recently got a new computer at work and I'm having trouble connecting to it from other computers. I can access other computers from it, just not the other way around. I checked all the usual ...
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172 views

How to configure VirtualBox so that I can address Guest VM by name instead of IP address?

I have a CentOS 6.3 VM running on a Windows 7 host using VirtualBox. The guest is using a Bridged Adapter. How can I configure VirtualBox to allow me to access my CentOS 6.3 guest OS by name instead ...
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126 views

Connecting PC with static IP to netbooter

I am trying to connect a netBooter to a computer with a static IP address. The instructions in the netbooter ( http://www.synaccess-net.com/support.php ) say that I can connect the netbooter directly ...
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501 views

WRT54G router with tomato firmware doesn't connect to internet if Windows 8 PC is suspended

This problem began occurring within the past couple of days, and to my knowledge I made no changes to any hardware or to my network layout. I have a Windows 8 PC connected to a gigabit switch (D-Link ...
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63 views

Telephone Server, Telephones, Printers, PCs & Servers on Individual VLAN's, DHCP clashing

Stuck at work tonight with a big issue. As a requirement for being taken over by a corporation we have been asked to stop using a firewall (juniper ssg-140) to separate our telephone system from the ...
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1answer
3k views

Connecting router (SMCWBR14S-3N) to modem (SB6121)

We recently purchased a Motorola SURFboard SB6121 modem and activated it with Comcast. After the technician activated the modem, she instructed me to connect a computer to it and try to go online. ...
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2answers
386 views

Connection loss to random websites on LAN

I work in as an IT manager in an office where there are 10+ computers. What my question is that, a particular computer has a connection to some websites. The network setup is a LAN connected to a ...
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3answers
2k views

Forcing refresh of a dhcp lease on an Ubuntu client

My Ubuntu 12.04 VM (in VirtualBox) has an IP of 10.0.0.67, I have deleted the lease in the DHCP server and set a reservation for 10.0.0.64. Despite multiple restarts, turning off and on the ethernet ...
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1answer
943 views

Vyatta DHCP relay is not relaying replies correctly in bridge

I have DHCP server (dnsmasq) on LAN network that has IP 192.168.255.2/16. Now I've created bridge on Vyatta that combines LAN and WLAN networks. Both NICs are on promiscuous mode in ESXi. If I put ...
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1answer
367 views

Not receiving responses sent from a different subnet when my machine is on DHCP

I am building a utility to communicate with some hardware that comes with a default IP address of 10.0.0.1 and subnet mask 255.255.255.0. The hardware replies to UDP messages on the same IP and port ...
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1answer
95 views

Reliable cross-platform way of determining hostname from IP address

Within the DHCP table of a router, clients that have sent their network name are listed with IP and MAC addresses. I need a way to get the host names that clients have sent. The router does not store ...
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1answer
419 views

PCs on domain can not resolve external IP addresses using the DC's DNS Server

I currently have a domain controller which handles all DHCP and DNS. The DHCP works just fine and the domain controller itself can use the internet with no issues. However, PCs that are part of the ...
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2answers
499 views

No route to host after changing interface to static ip

I installed a Linux (Ubuntu) server inside my home LAN, initially it's automatically configured to use DHCP interface. I'm connecting to this server from another computer using that server's hostname. ...
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1answer
401 views

virtualbox - dhcp issue with xubuntu guest on win7 host

I'm running VirtualBox 4.2.4 on a Windows 7 x64 host. I installed a Xubuntu guest system. The VM has network access through NAT. VirtualBox is configured to act as DHCP server (setup by default) and ...
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136 views

1:1 NAT IP address using iptables

Suppose I have 2 internal networks: 1.1.1.0/24 and 1.1.2.0/24 I would like to NAT a specific IP address from one network to the other, in which the new address would be obtained via DHCP. For ...
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2answers
795 views

DHCP not updating DNS

RHEL5.6, bind-9.3.6, and dhcp-3.0.5 So, after I fixed my problem with getting DHCP to parse the MAC addresses for these virtual machines, now I need to figure out how to get it to update DNS when one ...
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2k views

dhclient configures /etc/resolv.conf with invalid entry

I'm trying to figure out why running dhclient on my interface sets /etc/resolv conf to the ip number of my gateway(router). This entry is invalid and each and every time causes inability to resolve ...
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1answer
55 views

DHCP/routing oddness

I have a Squid proxy server on my network that is connected to the DHCPd server (commodity router) through a commodity switch. If there is a break in the connection (eg router needs to be rebooted) I ...
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1answer
628 views

dhcpd not processing broadcast DHCPDISCOVER

My DHCP server is handling two subnets. The first subnet is all host -> fixed-address sets for known hardware. The second subnet has a pool set up to handle virtual machines in a vCenter. Now, if ...
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3answers
813 views

Why does my computer not always automatically request a new DHCP lease when switching networks?

I've noticed an interesting problem recently where my laptop will not automatically refresh my DHCP lease when changing between wireless networks. Instead, it will attempt to use the existing lease ...
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2answers
194 views

Why does my IP address change back to private range when I reboot?

I have a windows domain with DNS that forwards to my ISP and DHCP that passes out addresses in the 10.0.0.X range. Things were fine until recently, now when I reboot I get a 192.168.40.X address ...
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1answer
125 views

m0n0wall firewall drops internet connection

I have an ADSL router running in "bridge mode" and a m0n0wall firewall behind that is running its DHCP client on its WAN port, where the ADSL router is connected to. I get regular arp errors in the ...
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1answer
80 views

Is there a reason to manually set an IP vs setting DHCP to assign a specific IP?

I'm running on a DDWRT'd (Linksys) router. I want to have static IPs on a few of my machines for port forwarding and tracing. I'm wondering if there are any benefits to one method over the other -- ...
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2answers
4k views

Running two wireless networks, with two different DHCP ranges (Virgin Media superhub woes)

I'm trying to create two wireless networks in my house, that would provide the client devices different ip address ranges and DNS settings, depending on which network they connect to. My current ...
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64 views

How to electronically determine if ISP assigns DHCP addresses in RFC1918 range

Is there an electronic method/protocol/public-website that I can use to definitively determine whether or not my ISP assigns (RFC1918, Private_network) addresses for DHCP assigned addresses? I ...
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48 views

Correct usage of Windows Server on network?

I have two routers, one with dhcp turned on and the other with it off. this is a functioning home network. Now, I am trying to integrate into it a windows server. Should the windows server be doing ...
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1answer
203 views

Wireless Bridge -DHCP

I was thinking of picking up a couple of TP-Link wireless routers, and setting them to bridge. I have a sep. LAN network that would have one of them, and I'd put one on my internet connection. ...
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1answer
288 views

domain network with DHCP + NAT

I'm configuring a virtual network on an esx server. I have a Windows Server 2008 R2 configured with these roles: - active directory domain services - DHCP server - DNS Server - Network Policy and ...
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2answers
2k views

Accesing internet with Host-Only network VirtualBox

I have two VMs in my VirtualBox. Both are FreeBSD and should communicate between each other. I have created network with DHCP enabled and set like this: Server Address 10.10.10.1 Server Mask ...
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1k views

Enbeded Linux device fails to get DHCP

I'm trying to get an embedded Linux device to use DHCP to get it's IP. I think it is trying, this is from the boot output: Configuring network interfaces: cat: can't open '/var/run/udhcpc.eth0.pid': ...
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115 views

Is there a way to tell the difference between a direct connection and network connection

I want to configure a linux(ubuntu) machine such that when a direct connection is made with another PC my machine will enable a DHCP server and serve it an IP address, but if my machine is connected ...
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1answer
559 views

DHCP server with multiple interfaces on ubuntu, destroys default gateway

I use Ubuntu, and I have many interfaces. eth0, which is my internet connection, and it gets its info from a DHCP-server totally outisde of my control. I then have eth1,eth2,eth3 and eth4 which I ...
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2answers
792 views

Two routers in a LAN

router A no wifi +--- pc01 +--- pc02 | +--- router B wifi +--- pc03 +--- printer In my LAN I have a ...
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0answers
259 views

Windows not recognizing local network domain name

I'm setting up a small network for a club that I'm a member of. The layout is a single server with two ethernet interfaces, connected to a wireless router and a wireless bridge. The bridge connects to ...
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1answer
4k views

How to request a specific IP address from DHCP server?

How to request a specific IP address from DHCP server? This question also touches the topic of DHCP address reservation in a router. Background: My home routers DHCP table only allows to create an ...
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2answers
93 views

Can I run a mix of static addressing and NAT?

Let's say that an ISP offers a plan with 5 static IP addresses, but I have more than 5 devices, many of which (such as a networked printer, for instance) I do not want or need to have a static IP ...
2
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1answer
434 views

Failed to connect to server: The requested address is a broadcast address, but the appropriate flag was not set

My server IP address starts with 128.xxx.xxx.xxx and my laptop gets its address as a DHCP and is of the for 10.254.xxx.xxx I configured the server to look for my laptop and when I start the server it ...
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1answer
52 views

Windows Server 2003 DHCP

I have a scenario where user had ip's 192.168.1.100 to 192.168.1.160 previously it was 192.168.1.10 to 192.168.1.254 The problem is that the ip of the users on 192.168.1.19 and 192.168.1.42 is not ...
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2k views

Windows 7 machine not pulling DHCP-issued address

Not sure where to go on this one. netsh winsock reset and netsh int ip reset did not help. If I set a static IP on the machine, it communicates fine. But it won't pull a DHCP address. Here's where ...
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3answers
4k views

How could I fix “No subnet declaration for restart (0.0.0.0)”?

I have a DHCP service installed on my distribution, Backtrack 5 R2 (ubuntu 10.04) and it was working fine, but when I began to configure DNS it suddenly stoped working, how can I make it work again?? ...
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2answers
4k views

“dhcpd failed” error when starting DHCP server

I am setting up a DHCP server on Debain (virtual machine) on Ubuntu 12.04 host, but unable to get it up and running. My configuration is like this, dhcpd.conf ddns-update-style none; option ...
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0answers
147 views

How to only obtain information from DHCP server without applying it on Linux [duplicate]

If I do dhclient eth1, it obtains the information (IP address, router, DNS, etc.) and applies it to routing table, /etc/resolv.conf and so on. How to only get and print the information from DHCP ...