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Questions tagged [dhcp-server]

Dynamic Host Configuration Protocol (DHCP)

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38 views

DHCP not sharing Internet access

I have several Virtual Machines in Vmware ESXi 6.5 with 2 Network Groups. Created a DHCP Server Machine on CentOs with 2 networks interface. 1 / vm network from which it takes a network and has IP ...
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0answers
22 views

Is the latest dhcp spec (rfc4361) invisable to admins?

When having an old Winsdows 2003 dhcp server, which doesn't understand the dhcp identifier OS'es such as Fedora 29 and Ubuntu 18.04 server sends. Which looks like 10,11/09/18,12:28:17,Assign,192.168....
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1answer
23 views

Exclude subnets from distribution?

In Windows' DHCP server it is possible to exclude an entire subnet from being given out to clients which doesn't have a reservation. They call this "IP addresses excluded from distribution". Now I ...
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0answers
24 views

Performance Tuning of my Gateway

I have established local Gateway(on Centos 7) Linux myGateway.com 3.10.0-862.11.6.el7.x86_64 #1 SMP Tue Aug 14 21:49:04 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux fire wall is established bandwidth per ...
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1answer
38 views

DHCP in Azure in case of fail in Onprem [closed]

Please confirm can we install DHCP server in Azure. Actually, we want to use this Azure DHCP in case of DHCP fail in Onprem. Please confirm how can we enable the same IP addresses in the Azure by ...
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0answers
72 views

Dynamic DNS client records not being updated correctly

Our network is running Windows and macOS clients all of which are joined to Active Directory. The Macs are all running Windows via Bootcamp. We were having issues which were being caused by our macOS ...
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30 views

Windows Server DHCP option 152

According to this document option 152 for DHCP servers shout provide base-time for clients. According to this RFC draft it should contain absolute time ( unix epoch): The base-time option is the ...
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31 views

Weird answer of linux DHCP server to gratitious ARP causes DHCP failure

This is a problem, that I ran into recently on a quite heavily configured linux server. This machine runs Samba as an Active Directory Domain Controller, a mail server, a web server, two virtual ...
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12 views

SonicWALL TZ205 IP Helper policy

Network connection: SonicWALL TZ205 port X1 is connected to ISP. Port X0 is connected to a Netgear switch. Windows Server 2012 R2 (AD DC, DNS & DHCP services) is connected to the Netgear ...
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40 views

Remove damaged RRAS server from domain network

I have 2 Windows Server 2012 R2 servers in the domain network. Server A was running RRAS and VPN services. Server B is running AD DC, DNS and DHCP services. Server A was broken and cannot be ...
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0answers
95 views

Why would ISC dhcpd ignore vendor options?

I'm trying to use an existing dhcpd to autoconfigure Raritan networked PDUs. This works roughly like PXE booting: there are additional DHCP options that direct the device to fetch a config file via ...
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71 views

How do you keep Windows from changing DHCP Reservation Names

It is a SBS-2011 Server. I will create a new DHCP reservation and set the reservation name to "GSMPC-11 N". Then it looks like when it goes active Windows changes the name to the computername.domain i....
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2answers
162 views

Two DHCP servers giving static addresses in a network

I have a network having two servers that are occasionally booted. I wish to maintain DHCP services even during a boot of one server. One of the servers currently has a DHCP server that gives static ...
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0answers
106 views

How to sync a Linux secondary DHCP server?

In this article they don't explain how the secondary DHCP server gets synced and in this one they sync the files with home made scripts. Question Having a secondary DHCP server is good practice I'd ...
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2answers
102 views

Disabled dhcp-server on router prevents clients from getting an address

I have a weird issue on my local network which prevents some clients, sometimes acquiring an ip address from the real dhcp-server (x.x.x.3). The dhcp-server is a CentOS VM running isc-dhcp-server for ...
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1answer
230 views

Setting up pfSense to bridge LAN NICs and connect WAN

I have a machine with four NICs (physical ethernet ports) and I'd like to set up a fully updated pfSense on it. So far it looks like this: A few things I've done so far: I've set up the bridge ("...
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1answer
131 views

Why is this checkbox disabled in Windows DHCP server range policy / vendor class management?

I manage several Windows 2012 based DHCP servers and on one of these I came across a peculiarity that I cannot explain and do not know where to correct: In DHCP manager*, expand [server name], then ...
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1answer
91 views

Have freeRadius/Linuxcooperate with DHCP-Server/Windows

We have freeRadius for authentication on a Ubuntu box, but the DHCP allocation is handled elsewhere, specifically by a Win2012R2 DHCP server. Is it possible to configure freeRadius in such a way that ...
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1answer
969 views

How to reserve a static-ip on Mikrotik router for a device that is attached to a fixed router's Ethernet port

I am trying hard to figure out how can I force any DHCP client device connects to the port ETH10 on Mikrotik router get assigned a fixed IP-address. Please note that the device MAC address is unknown ...
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0answers
16 views

Why is 2008r2 server making leases for itself in the DHCP scope?

I thought that the block of DHCP leases reserved by the server itself were for the Remote Access services, to hold them for the remote clients that might connect. I have moved VPN services to a ...
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1answer
31 views

How to configure second wireless router via VLAN trunk? [closed]

I am trying to figure how to configure the second wireless router, but I got stuck while trying to get the following configuration: For all VLANs (0-3), the primary router is the DHCP server for IPv4 ...
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0answers
13 views

When to switch to Link Local Address

If a networking embedded device that has no routable configuration but DHCP enabled and receives no response from any DHCP server in the network - should the device switch over to Link Local ...
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1answer
215 views

install DHCP on Windows Server 2016, but not start the Service

I am migrating from an Windows SBS 2008 to a new Server 2016 Machine. Now I want to install the DHCP Server on my targetserver and I know how to do that. In order to avoid 2 servers interfering with ...
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1answer
62 views

DHCP router option disregarded by all clients

My WAN router, a TP-LINK Archer C2 doesn't have a local DNS server for DHCP'd clients so I was looking for another solution. I found the Dual DHCP DNS Server for Windows and installed it on the LAN ...
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0answers
169 views

DHCP not working on RTL8111 NIC (DHCP Offer not arriving at receiver)

I'm experiencing some strange behaviour with a Dual Gigabit Ethernet NIC; I've setup a computer which has multiple network interfaces to connect some industrial cameras and setup a DHCP Server (isc-...
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3answers
384 views

What happens to DHCP sessions on client devices when the DHCP server breaks down and comes online after an interval?

Scenario: I use DHCP server to authenticate and provide specific services to my device. Everything is working well, my client device has a valid IP address 192.168.0.2 and a QoS service assigned by ...
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227 views

Configure DHCP Server in KVM Guest to provision all other KVM Guests

I set up a DHCP server in a KVM Guest inside a CentOS7 box. What I want is this DHCP Server to provide addresses to all other installed VMs and, if possible, the main host as well. The network used ...
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2answers
620 views

How do I find my DHCP server in Windows when I have a non-DHCP assigned IP address?

I work in an environment where we sometimes only have access to the servers and we always set up servers with static IPs. When I run our reports I need to check DHCP IP ranges and sometimes our ...
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1answer
31 views

What are the priorities when assigning IPs?

When deploying dnsmasq in order to server both DNS and DHCP I have a hard time understanding the priority of various settings. The network, DHCP-wise, is composed of various devices: the ones which ...
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1answer
362 views

DHCP relay not relaying responses

DHCP Relay NICs: NIC 1: connection to DHCP server (assigned by 172.20.0.1): enp1s0 Link encap:Ethernet HWaddr 00:e0:4c:68:39:0d inet addr:172.20.0.103 Bcast:172.20.0.255 Mask:255....
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1answer
395 views

Are static IP's supposed to show up in DHCP.leases list?

I messed with the dhcp.leases file (removed, and remade it) hoping it would force the IP's to repopulate. That was a mistake.. I think I have fixed it by reinstalling though. Anyway, I setup static ...
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1answer
88 views

How can I configure DHCP server to issue the same fixed-address by matching with the client identifier in the discover message

I am able to config fixed ip address with hardware ethernet options, but i am trying to assign fixed ip based on client id(option 61) from DISCOVER message. I tried with below configs , but it doesn't ...
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1answer
87 views

Have a script receive an IP from the DHCP server?

None of the Nagios DHCP check plugins can actually take an IP from the DHCP server as a real test. All they do is ask which IP it would give to a certain mac address. Our DHCP server failed, where ...
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0answers
1k views

How to configure DHCP for wireless clients on TP-Link N Modem Router?

I have a TP-Link TD-8961ND Wireless N ADSL2+ modem router with which I would like to deploy wireless internet in a meeting room. The Internet source is an Ethernet cable which I connect to one of the ...
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1answer
334 views

Linux DHCPv6 server for PD on ppp interfaces

I need to configure prefix delegation on PPPoE. What is the best DHCPv6 server implementation for this? So far I checked the following: isc-dhcp-server - doesn't work with PPP interfaces dibbler - ...
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18 views

Clients continuously get new ips from server 2012 DHCP

Clients continuously get new ips from server 2012 DHCP. I can release and renew and get a new ip every time. I am also not able to configure reservations for the same machines. I have considered the ...
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1answer
76 views

VCenter has failed, DHCP server is down

Our VCenter is crashing and technicians are trying to work on it, however this has resulted in the DHCP server failing, therefore none of the machines on the network can connect to the Domain ...
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1answer
62 views

Windows dns messed up

Our small windows domain is based on two old 2003 server which are domain controllers. They both have dns server and dhcp server running on them. Each dhcp server has its own range of ip addresses in ...
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1answer
45 views

Does a DHCP client is expected to send DHCP request unicast to the Server in the event of a Unplug/replug or eth0 down and up?

I would like to understand if the DHCP client running in our embedded device is expected to send DHCP request unicasted to the server in the following events? Eth0 goes down and comes back online ...
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0answers
126 views

Using a (g)MSA for Windows DHCP Server

Windows Server 2016 Essentials doesn't have a requirement for CALs but it is limited to 25 users. I don't think that there's any technical enforcement of this bar a message that's logged in the Event ...
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0answers
52 views

Default gateway settings on DHCP NIC

I'm kinda new in the Server world. I have a Windows Server with two NICs, one for internet and one for DHCP on the LAN - however, the second NIC shows up as "unidentified network" and I cant change ...
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0answers
72 views

DNS issue when communicating with Windows Server 2012 R2

I have upgraded my Windows Server 2008 R2 to a new Windows Server 2012 R2 and installed AD DS, but when to trying to join other PCs to the domain it gives the following error: The specified domain ...
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0answers
336 views

Migrate windows server 2008 r2 and 2012 to 2016

I'm preparing to migrate our old infrastructure to windows server 2016, currently I have multiple windows servers: ONE Windows server 2008 r2 with role of DC, Exchange, File Server, DHCP Server and ...
0
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1answer
545 views

Option 81 in DHCP

Just curious about this. When we enable option 81 on a DHCP network, the DHCP server will start updating the zone that comes along with the client's FQDN. Now, how would client will ever know its ...
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2answers
1k views

DHCP relay through different subnets

A TP-Link W8980 acts as a DHCP server on 192.168.0.0/24 subnet. This is also the only wifi access point. A Zyxel USG 50 is connected to it through its 2 WAN ports and has static addresses 192.168.0....
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2answers
471 views

DHCP server problems with static IP clients

lately I've been having some problems with my DHCP and my clients IP. So basically, in my netwrok I have a DHCP server (Windows 2012 R2) which is working fine (when you connect to the network you get ...
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0answers
52 views

ISC DHCP (Infoblox) takes 30+ seconds to respond to DISCOVERS

Client's DISCOVER packets reach the Infoblox DHCP server through DHCP relays, but Infoblox doesn't seem to be responding. I checked the pcap taken from the DHCP server, I can see there is 3 DISCOVERS ...
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1answer
1k views

Can the network still work when DNS & DHCP go offline?

In my LAN I have a Windows server and a Synology NAS for storage, directly attached to the server and provided as storage to the clients through a VM. The server provides the domain controller, the ...
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1answer
455 views

DHCP lease expiry shows as “0 seconds” on TP-Link router

A client who runs a small café sometimes has occasional trouble with new people logging on so I've volunteered to monitor their router for a while. I've noticed that when an entry reaches it's expiry, ...
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3answers
84 views

Windows 2012 Server DHCP ignores reservations

Given a Windows 2012 Server DHCP server When a add an IP Reservation for an IP address providing the client's MAC address And this client is powered off And a different Windows client with a ...