All Questions
101
questions
27
votes
3
answers
53k
views
Wrong IP address from DHCP client on Ubuntu 18.04
I'm experiencing a weird issue where my Ubuntu 18.04 (server) box gets issued a wrong IP address during boot from the DHCP server. Running dhclient after boot on the interface results in the right IP ...
- 782
15
votes
5
answers
71k
views
DHCP Reservation vs Static IP address
So after browsing some websites, some people are telling me that static IP address is the best. But others say the DHCP Reservation is just as good if not the same.
So what is better? Or are they ...
- 189
6
votes
3
answers
24k
views
What is the "Alternate Configuration" tab in TCP/IP settings
As I know there is two choice for configuring a computer IP address in the network. Assigning a Static IP or obtaining a dynamic IP from a DHCP server.
But what is the Alternate Configuration in ...
- 728
5
votes
6
answers
17k
views
Can I assign any static IP address to a device on my network? Or does it have to be within the DHCP servers (or routers) defined subnet?
Currently, my DHCP server is handing out IP addresses in the 192.168.0.1/24 range. What would happen if I set a static IP address on a device of, e.g., 192.168.1.10?
And just out of curiosity, what ...
- 89
5
votes
3
answers
23k
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!
...
- 231
5
votes
2
answers
7k
views
Can't add static lease from inside DHCP range in pfSense
When trying to add my computer to static lease, I get the following error
I don't understand the reason for this. If I would want to assign IP from outside DHCP range, I would assign it statically ...
- 12.8k
5
votes
1
answer
9k
views
How can I determine the IP addresses allocated by DHCP on a router that I'm connected to?
This “router” is not a typical situation. I’m using my phone as a hotspot and can only configure a select number of DHCP options.
I can manage the limit on how many devices/clients can use my phone ...
- 89
4
votes
3
answers
29k
views
How to assign a static IP to a Computer in Active Directory
I'd like to know how you can assign a static IP address to a computer using Active Directory.
I know it is possible with a user using the Dial-in tab, but doing it on a computer has no effect (unless ...
- 2,673
4
votes
3
answers
22k
views
How do I create a DHCP address reservation for an Internet Connection Sharing client?
I have Internet Connection Sharing enabled on a Windows computer that's hosting the Internet connection. I have manually assigned what IP address to be used with the DHCP service on the host by ...
- 20.9k
3
votes
1
answer
2k
views
Why does DHCP Server prefer unicasting over broadcasting and at what cost?
According to this book the DHCP Offer must be broadcast, yet sniffing DHCP packets: it looks like neither OFFER nor ACK is broadcast (or am I mistaken here?). The screenshot was taken during:
ipconfig ...
- 237
3
votes
2
answers
5k
views
How do I permanently assign an IP address with DHCP?
I am wondering if there is anything (software or hardware) out there that can do something I think I may have made up, Dynamic Static IPs. The idea is that when a new device connects to the local ...
- 159
3
votes
2
answers
4k
views
Static IP, DHCP Reservation, or *both*?
Fairly new to networking concepts, have read the thread DHCP Reservation vs Static IP address, and still have a "dumb" question that wasn't asked there:
I have two devices I'd like to "freeze" an IP ...
- 95
3
votes
1
answer
1k
views
How can I add some static IP address at IPv6 for Windows 2012 DHCP server?
I would like to add some static IP address to my Windows 2012 DHCP server. I have tried to pair the IP address with its MAC address. At IPv4 it works, but how can do it at IPv6? Could anybody link a ...
- 149
3
votes
2
answers
670
views
MacBook Pro not obtaining IP address after replacing logic board
I just got my MacBook Pro back today from having the logic board replaced. While in the Apple store the Internet worked ok.
I got home and it was able to connect to my WiFi, but could not obtain an ...
- 151
3
votes
0
answers
3k
views
ipconfig /release (AUTO RENEW???)
I have a (very very) remote machine running over teamviewer, I (mistakenly) ran
ipconfig /release
The machine is set never to sleep or restart and no items are set to power saving mode. The only ...
- 31
3
votes
2
answers
2k
views
Want to know the local IP address assigned to me by my ISP
I use a TP-Link router (3420) to connect to my ISP.
My local IP address is 192.168.0.22. The ISP uses DHCP and the router shows the range of it 10.19.xxx.xxx. Sites like whatismyip.com show the ...
- 41
3
votes
2
answers
3k
views
Why won't my DHCP addresses "stick"?
I've been having some addressing issues that I've been unable to solve, and I'm hoping I can get some guidance about other things to research.
Service provider is Time Warner cable. A static IP is ...
- 1,799
3
votes
1
answer
10k
views
Ethernet connection shows unidentified network with no internet access
For years I've used a physical Ethernet connection for my internet access, then a few days ago it went down and said it was an unidentified network with no internet access. I dug out a wifi card and ...
- 356
2
votes
3
answers
7k
views
Why the IP address of the router is used as the address of the dns server?
These are the steps for converting a router to dhcp:
Why used the router IP as the DNS server IP address in the last case?
Should not use the IP address of servers like Google (8.8.8.8)?
- 514
2
votes
4
answers
57k
views
Getting strange IP Address from router
I've had a router set up for quite some time and it has been working perfectly. My wife called me to tell me the wireless internet wasn't working and when I came home I saw that my phone was connected ...
- 58
2
votes
1
answer
299
views
Laptop accessible on the same IP via wireless and wired connection?
I have laptop which I sometimes connect to my LAN via wireless or wired connection (addresses are assigned via DHCP from the same subnet). I wonder how to setup common IP address on Ubuntu 20.04 to be ...
2
votes
3
answers
1k
views
how to connect to different WI-FI with static and dynamic IP addresses?
How to connect to different WI-FI with static and dynamic IP addresses?
I have any user with loptop that connect to Wi-Fi inside Co and I set static IP for them
But when users go to their home and ...
- 21
2
votes
1
answer
2k
views
Prevent networkmanager to disable an interface if dhcp timeout when mixed dhcp and fixe ip configuration
I need to find a way for a computer to have both a fixed ip address AND have be a dhcp client on the same interface. So far it works great, I am using Debian 11 and NetworkManager.
The problem, is ...
- 301
2
votes
1
answer
50
views
Networking subnetting
I have a quick question I'm trying to set up my router DHCP server to have as many leases as possible so I'm trying to change its settings.
At the moment it's set like this:
Lan IP address 10.10.0.1
...
2
votes
1
answer
3k
views
Find unknown static IP without DHCP enabled or gateway configured
I have a device with a static network configuration (DHCP client not enabled).
I don't know the IP address or subnet mask of the device. I only know the MAC address.
The gateway is not configured (0.0....
- 21
2
votes
1
answer
110
views
On boot, how can I switch to a static IP based on a gateway IP provided by DHCP?
I have a "headless" *NIX host -- let's call it 'foo' -- that is to be accessible via SSH and VNC-tunneled-over-SSH on an arbitrary 192.168.x.y/24 private LAN. Sometimes, I want to physically move 'foo'...
- 178
2
votes
3
answers
1k
views
IP Address conflict in a LAN
How to find if someone has taken a particular IP address in a Local Area Network? Or in a more generalized form, how to find the list of IP address that DHCP has allocated in a Local Area Network?
- 23
2
votes
1
answer
861
views
Is it possible to use DHCP to obtain default gateway and DNS server only?
I have a few VMs which I want to keep with static IP addresses. However, I run those on my laptop and frequently connect to different networks which use different default gateway and different DNS ...
- 983
2
votes
1
answer
271
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 ...
- 151
1
vote
3
answers
414
views
How to retain a unique IP on a client with a static IP in a DHCP subnet?
When I say DHCP subnet I mean that the clients are intended to receive their network configuration via DHCP, not statically.
Let's observe the following situation:
I set up an IP address statically,...
1
vote
5
answers
27k
views
I should have a dynamic IP, but it won't change
I have run ipconfig /all, which tells me DHCP is enabled, meaning I should have a dynamic IP address. However, no matter how many times I restart the modem, I end up with the same IP address. What am ...
1
vote
1
answer
111
views
Find IP origin within a network
We're having a look through our firewall traffic on the Domain, and some unknown IPs keep appearing. Having a look through DNS, DHCP, ping and tracert also provides no insight, as they don't appear to ...
- 1,256
1
vote
3
answers
3k
views
How does my ISP send my IP address to my DHCP server (router)?
It is well know that usually in small networks the IP of a host is allocated by the router, which acts as a DHCP server. Also, since my router acts as a NAT, it is sufficient to give my subnet a ...
- 155
1
vote
1
answer
142
views
Send files between two systems over LAN
I am able to send the files from one to another system connected on same router in a LAN.
Now, I connected one more router to the first router to increase the range of wireless connectivity.
When I ...
- 135
1
vote
3
answers
3k
views
network issue after using macchanger. no internet, no ipv4
I used macchanger with these commands:
sudo ifconfig eth0 down
sudo macchanger -r eth0
sudo ifconfig eth0 up
I am using it with virtualbox on a local network, I've never had issue with that before, ...
Benji
1
vote
1
answer
6k
views
Can't connect with IP outside the DHCP range
My modem/router (it acts as both) has an IP of 192.168.0.1. The subnet mask is 255.255.255.0. The range of IP addresses used for DHCP is 192.168.0.100 to 192.168.0.200. To be clear, if I connect with ...
- 131
1
vote
1
answer
20k
views
PC is getting wrong IP address despite DHCP
From one day to the other (maybe a windows update was in between, not sure), my PC is currently always (self assigning?) getting an IP address configured like this:
Automatically configured IPv4-...
- 357
1
vote
1
answer
1k
views
Static IP in dhcp server
I have the following situation:
Home network DHCP server ranged : 192.168.1.2-99
I need to set up a static ip for a machine in: 192.168.1.91
I cant set it up from network adapter because this ...
- 23
1
vote
1
answer
157
views
Macvtap connectivity lost after a few hours?
I setup a macvtap interface like this:
ip link add link eth0 vlan type macvlan mode bridge
ip address add 10.0.0.17 dev vlan
ip link set dev vlan up
ip route flush dev eth0
ip route flush dev vlan
ip ...
- 593
1
vote
0
answers
195
views
Connecting the old router to the main router
I have Calix 854G-2 as my main router (with IP: 192.168.1.1), and Netis WF2419, the old router that I want to connect with main router via wireless (not able to connect them with cable). In the DHCP ...
- 11
1
vote
1
answer
3k
views
netsh interface ipv4 show config doesn't match Windows 10 IP assignment in Settings?
I have set a static IP address using the netsh command interface.
The IP address is indeed statically set. This is verified by being able to communicate with a device expecting the static IP address. ...
- 111
1
vote
0
answers
280
views
IP release and renew return the same IP on a new LAN with different IP scheme
Something strange I've encountered for the first time. Windows 7 PC was movied from one LAN to another and still kept getting the same IP address from DHCP as it did at old LAN location. For example,
...
- 11
1
vote
0
answers
359
views
Linux IP aliasing with single DHCP and single STATIC IP address
I'm working on an embedded system with a single physical ethernet device. Using aliasing, I'd like the device configured such that one static IP address (call it s.s.s.s) is ALWAYS available. The ...
- 11
1
vote
1
answer
425
views
How to eliminate the downtime when a dynamic IP address changes?
We currently have a number of client computers linked up to a database server (MS SQL 2008) for replication. The database server recognises the computers based on their Windows hostname. We are using ...
- 534
1
vote
1
answer
1k
views
DHCP Pool Range / IP-Camera Setup
Lately I have been trying to set up a IP-Camera for friends wirelessly.
I realized on their router its DHCP pool range is from 192.169.2.100 - 192.168.2.200.
But when I changed the IP address of the ...
- 133
1
vote
0
answers
281
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 ...
- 143
0
votes
3
answers
480
views
What is the relationship between my public IP address and the address assigned to my NIC?
When I run an online IP-lookup tool, like https://whatismyipaddress.com/, I get an IP address like 24.253.65.208.
But I've set up my home router as a DHCP Server and I've assigned static IP addresses ...
- 1,207
0
votes
2
answers
668
views
Very weird DHCP IP range, never seen it before
I'm trying to figure out what this DHCP IP range means, it's in a format which I've never seen before.
Am I right in thinking that the range is in the middle? If so, then what the heck is the number ...
- 1
0
votes
2
answers
1k
views
IP address assignment and configuration for multiple devices, multiple routers at home
Due to various reasons, I have 3 WiFi broadband routers at my home (or say my personal hobby hacking lab). On WAN side one is FTTH, another is ADSL and third is 4G-LTE. On WLAN side they are assigned ...
- 659
0
votes
1
answer
64
views
Do DHCP and IP depend on each other?
DHCP is a protocol at the application layer, so it must depend on the IP protocol in the network layer. But the IP protocol requires assignment of IP addresses to network interfaces, which is the job ...
- 17.3k