Questions tagged [dhcp]

For questions about DHCP in in relation to network devices. For instance, you are setting up DHCP on a layer 3 switch.

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3answers
21k views

Can Cisco Catalyst switch get IP from DHCP server?

This may be stupid question as I don't have much knowledge in networking. Anyways, I have Cisco Catalyst 2960 switch and I'm curios if I can configure it to get IP configuration from DHCP server, ...
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2answers
1k views

Will DHCP server know about the statically allocated IP addresses for any of the device under its purview? [closed]

For simplicity sake, let us say, the DHCP server is running in the default gateway/router at 192.168.1.1/24 And let us say, i have connected 10 hosts to the router. And among 10 hosts, 2 of the ...
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1answer
1k views

How to Configure DHCP to Assign a Specific IP Address to a MAC Address in IOS

How can I manually configure DHCP to give a certain IP address to a specific MAC address in Cisco Packet Tracer? I know how to configure DHCP, but I don't know the configuration which is used give an ...
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1answer
3k views

AP does not have assigned IP address by DHCP

I have aironet-1242 and air-cap2600i AP's, infact I'm trying to upload image on to my PC through TFTP, as I assign static IP address to fastethernet or BVI interfaces and start uploading, AP ...
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5answers
12k views

Duplicate IP Address - which one wins?

If there's a duplicate IP address, which one "wins"? First, last, flaps, neither?
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2answers
5k views

Wago PLC - assign IP address/factory reset

I have a Wago 750-352 Ethernet Coupler which I believe has been assigned an IP address already. In attempting to use the Wago BootP Server to connect to the device I am unable to connect to it. I ...
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4answers
3k views

How does DHCP assign an IP address?

I understand that IP address is a unique address to identify a machine in a network. But for the first time when i Plug in say ethernet cable of a network to my PC's Ethernet Port, how the IP address ...
7
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3answers
57k views

dhcp failed. apipa is being used

I'm testing a network and I use the vlan among 20 vlan but in this packet tracer I just use 10 Vlan on my network, In this case, I use the DHCP server on my multilayer switch, not on my router. so ...
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0answers
24 views

Should static IPs be set on the DNS/DHCP server, the host, or both? [closed]

Assuming a pretty regular business setup, when assigning static IPs for servers to use, should they be assigned on the DNS/DHCP server? Should they be configured individually on the hosts? Or should ...
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2answers
751 views

How does a DHCP server differentiate between 2 requesting devices?

An arriving client sends a DHCP discover with source IP 0.0.0.0:68 and destination IP 255.255.255.255:67 and the server replies with an offer having its IP to destination 255.255.255.255:68, then the ...
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4answers
7k views

MikroTik - same static DHCP lease with one IP address for LAN and WAN [closed]

MY QUESTION IS: Is it possible to use static DHCP leases for same IP addres and two MAC addresses - LAN and WAN - that the host would be able to receive all the time the same IP address (192.168.1....
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2answers
1k views

Mikrotik CloudCore1036 static DHCP configuration using multiple NIC - LAN and WLAN [closed]

My question is it possible to configure CC1036 like a DHCP server which would be able to: gives to specified host (for example Local Station 5) same IPv4 address based on his MAC LAN and MAC WLAN ...
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3answers
20k views

Does authoritative DHCP server mean no static IP setting? [closed]

I've recently switched my Mikrotik Router's DHCP server to authoritative mode. It fixed several problems with some clients remembering bad IP addresses. But what would happen if I connected a device ...
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1answer
582 views

Laptop can get DHCP address but other devices cannot when plugged into the same switchport

I currently have 1x Juniper ex3300 and 1x HP ProCurve 2848 forming the core of my network with vlans 1, 10, 20 and 30 being trunked between them on ports 46-47. The ex3300 acts as the DHCP server for ...
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2answers
1k views

DHCP Internal Lan Wrong Leases [closed]

I have a Wireless Interface in bridge mode. I setup a DHCP Server listening on bridge-local interface. Moreover, I have an ethernet1 with 192.168.1.202. 10.1.0.0/24 on bridge-local itnerface. The ...
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3answers
2k views

Will DHCP Relay work across different subnets?

Network: ISPs Actiontec router LAN subnetted to /25 - cannot ping into Cisco subnet Cisco RV130 subnetted to /25 WAN port to Actiontec LAN port set as Gateway, Router mode would not allow internet ...
0
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1answer
67 views

Configuring DHCP server [closed]

I am playing around in my virtual environment and I would like to find out what is the best practise to configure DHCP server - configure it on the Router or Server running Windows Server or some type ...
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2answers
2k views

Connecting multiple devices on static IP Internet connection

I have to set up remote back infrastructure for my company. The software I am using requires FTP server for remote backup. I am using QNAP NAS box the same which provides a built in FTP server. I have ...
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2answers
1k views

ARP and DHCP same address to different device?

On my work network, when I go to my DHCP server, then open DHCP > domain_name > IPv4 > Address Leases, I found that 192.168.160.7 is assigned to a iPad device (connected via Wifi). When I use command ...
2
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1answer
886 views

Can not receive DHCP request from different VLAN

I've been faced with this. I've set up a DHCP pool at the server with the following configuration: pool-vlan20 default gateway: 192.168.2.1 start ip: 192.168.2.100 The router has been set up as the ...
0
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1answer
5k views

DHCP on Access Point vs DHCP on Router [closed]

At an accommodation house for our company staff, We have about 10 Access Points and they are all connected to a Router, which is then connected to an optical fiber internet connection. The Access ...
1
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1answer
86 views

Why is my Cisco MMS891 assigning IP addresses with static NAT entries to devices via DHCP?

I have a Cisco MMS891 ISR as my edge router with several static NAT entries, which are set up to NAT my LAN IP addresses (which are statically assigned to printers) to access an externally hosted ...
0
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1answer
496 views

Is this a valid network diagram?

I'm studing how to create a network diagram to this problem The problem is: 7 condominiums with 7 floors each one, each floor has 4 apartments The project is needed to use VLANs, Routers, DHCP, DNS'...
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2answers
4k views

Configuring DHCP relay agent with VLAN's

I'm kinda confused. I'm learning VLAN's now. So I decided to make a small lab - I need to make 4 dhcp pools on Router0 (which you can see on the pictures) for VLAN 100, 200, 300, 400 (pool 100 for ...
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1answer
6k views

ACL for DHCP configured on Cisco switch

We have a DHCP pool configured on Cisco L3 switch for hosts on SVI. Since we want to restrict connectivity to DHCP which is on the same switch. excluded 172.24.19.1-172.24.19.50 SVI IP 172.24.19.50 ...
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2answers
617 views

DHCP dora process on L2 [closed]

can you explain in DHCP dora process how discover ,offer, request and ack massages send on L2 ? i know all 4 massages will be broadcast on L3 but on L2 how they will transfer (unicast or broadcast)
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2answers
950 views

GNS3 - configure two DHCP servers within one VLAN

I have the following configuration: I would like to provide every host from VLAN_101 with DHCP-provided IP addresses. There are two DHCP servers running - one grants adresses for every host below ...
3
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3answers
3k views

Wireless Access Point and Proxy Server Setup

I was tasked to put up a network for a new department with about 7 users using wired and wireless connection. Our Main network has DHCP and PROXY Server using Windows Server 2003. Here's my simple ...
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1answer
409 views

SG300 DHCP server - make it re-issue same addresses to same devices

We have recently installed a Cisco SG300-52MP as a backbone router with DHCP server and voice VLAN. We have also discovered that when current DHCP lease is expired, the router issues a completely new ...
0
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1answer
291 views

Acquiring new IP when changing subnet [closed]

DHCP allows a computer to acquire a new IP address whenever it moves to a new subnet. Why is this not always enough to address the communications needs of mobile hosts?
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2answers
245 views

Trying to get DHCP to work in a VLAN

I am trying to get DHCP to work on a VLAN. I have 3 VLANS and they are .10, .11, .12. .11 and .12 are working fine, they are getting ip addresses and their corresponding gateways from the DHCP ...
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2answers
1k views

Prevent DHCP looping

Today my company had an annoying issue with DHCP looping. I spent more than 2 hours to figure out why several PCs get IPs from VOIP subnet. My manager spent about 30 minutes and figured out that ...
3
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1answer
847 views

Routing Between VLANs on Cisco 1921

I have setup a new VLAN for VoIP phones that are being installed. I would like to segment their traffic to Subnet 10.20.77.0/24. I added an IP address to the DHCP server of 10.20.77.11 to help serve ...
1
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2answers
586 views

Load balancing with Cisco 1941 router

I have the following setup: Two modems/router for two DSL lines (different ISPs) Cisco 1941 router HP 1920 managed switch Server with dual ethernet ports workstations I would like to bond both lines ...
2
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1answer
824 views

converting AP from autonomous to CAPWAP; DHCP keeps interrupting TFTP Process (follow up)

This question is actually a follow up to this link: converting AP from CAPWAP to autonomous - BVI1 interface gets reverted back to DHCP The method I tried to follow: AP#debug capwap console cli ...
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1answer
1k views

Simple networking behind a router without NAT and DHCP

I am novice to network engineering. I have two questions : Is it possible to assign a fixed public Ip address to a pc directly connected to a router without a dhcp and a NAT and having access to ...
4
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1answer
615 views

Random DHCP clients do not accept Cisco Catalyst DHCP server's offer

I have a central Cisco Catalyst 3750-X that acts as the DHCP server for all VLANs that need DHCP. Three VLANs need DHCP: 81, 100, and 111. I have had no issues with DHCP on VLANs 81 and 100. However, ...
2
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2answers
6k views

DHCP Server On Two Subnet On Single Shared Network

I had been working in a mid-large company, and had limited administrator privilege both server and network. We had network that had two subnet on single shared network consist of 192.168.1.0/24 and ...
2
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1answer
1k views

PPPoE setup Cisco 881W

I've been trying to fix this myself but I'm afraid I can't. I've tried basically every tutorial already, but it still doesn't work. Can someone here write a tutorial on how to get PPPoE working with ...
1
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1answer
703 views

Configuring Cisco 4500 series to send DHCP bind info to syslog server?

I am working with a client who needs to be able to view centralized logs for dhcp binds from their multiple 4510's. Is it possible to send a log of each DHCP binding to their syslog server? Would ...
0
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1answer
2k views

Cisco AP's ignoring option 43 offered via infoblox as the dhcp server [duplicate]

I have an issue with option 43 , the AP's (cisco )are learning option 43 when cisco switch is configured as the DHCP server but AP's are ignoring the option 43 when infoblox is configured as the ...
3
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2answers
1k views

Share an internet connection within three separate subnetworks/VLANs

I want to share a FO/Internet connection among three separate small offices. Internet provider modem/router has LAN 192.168.1.0/24, with its gateway at 192.168.1.1 and serving IPs (192.168.1.100-200) ...
1
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2answers
850 views

Specific questions regarding Arp/DHCP

In my Network are: Router Client 1: Victim Client 2: Attacker (Raspberry Pi) Client 3: My Computer (SSH to Raspberry) All Clients are connected wireless to the router. All Clients are registered ...
2
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2answers
2k views

DHCP Server giving the wrong IP address and DHCP server failed Apipa being used

My problem is when I'am trying to use DHCP server to give out IP address the Ip address that it gives away is the default gateway of the DHCP server and it only gives ip address to a single PC the ...
3
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1answer
11k views

Difference Between Number of CPEs and Number of hosts

I have to extend the wifi range by using two wireless routers.First I will have to configure the DHCP settings in my primary router.But its setting mentions number of CPEs instead of Hosts.Do they ...
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3answers
88 views

Is there an advantage to setting a device to dhcp and assigning an ip via dhcp vs setting a static ip?

I've always hard coded my devices to have their own ips. But lately I've read that allowing dhcp to do that for me might be beneficial. I'm not sure I agree with it but I thought I'd see what everyone ...
1
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1answer
702 views

DHCP packets - aren't they always supposed to be broadcasted?

So, as I understand it, all DHCP/BOOTP REQUEST packets are supposed to be broadcasted (255.255.255.255), because that's really the only way to communicate back and forth with a host on a LAN that ...
4
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1answer
5k views

DHCP Option 26 (MTU) queries [closed]

I could not find much information on option 26 ( MTU ) from the https://www.ietf.org/rfc/rfc2132.txt, I learned the bellow 2 points from the blog http://www.microhowto.info/howto/...
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2answers
15k views

Devices in VLAN can't obtain IP address from DHCP server

I'd like to build the company network with a L2 Switch. Here are the requirements. Marketing team's computers and the visitors's mobile devices need to access the Internet. Other business computers ...
1
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1answer
38 views

Detecting or announcing link changes in a switched network

Is there a protocol for that switches, or devices with multiple network ports, could use to signal link changes, or some mean to try to detect link changes? The scenario I'm trying to solve is ...

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