Weird IP dddresses assigned by my Wi-Fi router

I'm totally confused by what's happening to my wifi router, so seeking help here.

Configuration

I have a modem/wifi router (Netgear CG3000D—let's call it main) connected to cable and configured with 255.255.255.0 mask. The LAN works fine, I'm getting 192.168.0.xxx IP addresses.

Connected to the router via CAT5 there is another wifi-router, used as a switch and broadcasting another wifi network—255.255.255.0 IP addresses are seen on its LAN ports as well as on the Wi-Fi connections.

On the wifi from the main router I also used to have 192.168.0.xxx IPs via DHCP and everything was working perfectly.

Problem

But all of a sudden at some point my main router decided to switch wifi connections to 255.255.0.0 mask. So now devices connected to this network get IPs of 169.254.x.x and cannot communicate to other devices on the network.

Question

I am totally puzzled by why this happened and also where exactly these settings are. Nothing on the main router seem to be setting this. And I don't think the second switch should be affecting this, but mentioned it to give a fuller picture.

Any ideas where to look at?

Replay

Give this a shot . . .

  1. power off the machines getting the 169.254.x.x addresses and keep them powered off.
  2. Now, unplug the power from your wireless router and wait two minutes with the electrical power disconnected and then plug it back in and let it power up.
  3. Wait five minutes and now start up the machine with the issue.

Check the IP assignment on the device connected to the router now and see if things are back to normal.


The 169.254.x.x Address

Because the 169.254.x.x IP address was the dynamically assigned IP address to this machine, we knew DHCP was having an issue giving it an IP address, and I've seen this many times when routers start acting up like this — and not necessarily just with Windows either.

Automatic Private IP Addressing (APIPA) is a DHCP failover mechanism for local Internet Protocol version 4 (IPv4) networks supported by Microsoft Windows. With APIPA, DHCP clients can obtain IP addresses when DHCP servers are non-functional. APIPA exists in all modern versions of Windows including Windows 10.

When the DHCP process fails, Windows automatically allocates an IP addresses from the private range 169.254.0.1 to 169.254.255.254. Using ARP, clients verify the chosen APIPA address is unique on the network before deciding to use it. Clients then continue checking back with the DHCP server at a periodic interval (usually 5 minutes) and update their addresses automatically when the DHCP server is again able to service requests.

source


Reasons

Routers are just like any other device with an OS and circuitry components running on electricity; sometimes they get fragmented memory, etc. and just need to be power cycled to refresh everything for all feature and functions to work properly again when such behavior exists.

Power cycling routers seems to work best while all devices are disconnected from them (wired and wireless); hence, powering them off.


Further Considerations

You could also look for a firmware update for your router make and model if you continue to have such issues—there could be a bug, memory leak, etc. that's been patched via a newer version of firmware if you continue to have ongoing experiences like this (even if you go days without it but then...).

Category: wireless networking Time: 2016-07-30 Views: 0

Related post

  • Weird IPs assigned by my Wi-Fi router 2016-07-30

    I'm totally confused by what's happening to my wifi router, so seeking help here. First, the configuration. I have a modem/wifi router (Netgear CG3000D, let's call it main) connected to cable and configured with 255.255.255.0 mask. LAN works fine, I'

  • Laptop being assigned IPv4 address out of router's DHCP range 2012-03-28

    I have a laptop connecting wirelessly to an E4200 Linksys router. The router is configured to use DHCP with a range from #.#.#.100 to #.#.#.254. However, the laptop is being assigned an IP address of #.#.#.80 which is below the specified DHCP range.

  • How to add statically-assigned subnet to Cisco 887VAW router? 2013-02-26

    As an IOS neophyte, I've been struggling to configure our office's new Cisco 887VAW ADSL router. After much head-scratching I've managed to sort the ADSL end out, and configured the router to provide DHCP on its ethernet interface (192.16.10.0/24, wi

  • Totally different IP addresses assigned when using the same router 2013-06-10

    For some time I have observed a strange behaviour when connecting to the internet through my WLAN. Depending on the computer I use on my network, the ISP assigns me totally different external IP addresses (some begin with 81. ... some with 221. ...).

  • Weird slow uplink problems on my home Debian router and new fast connection 2012-08-09

    Yesterday I got a new and shiny VDSL2 connection home! It's specced at 100Mbit/10Mbit, and seems to deliver pretty close to the mark. Now, I have a Debian squeeze linux box acting as a home NAS and router. It's running shorewall, with NAT and tc enab

  • Collect data from user - weird interaction? 2016-06-27

    I'm working on a workflow involving collecting data from users. At the end of the workflow, it writes the data collected to certain fields in a custom list. To test the workflow, I have 2 accounts, my regular account that I'm developing the site with

  • Assign a public static IP address to a router 2011-02-22

    Am I able to assign the static IP address that my ISP provides me directly to my router? My ISP are telling me that I have to assign the IP to a server inside the network instead, and cannot assign it directly to the router. Can anyone clarify this?

  • Assigning a fixed local IP address to a particular MAC address in Linksys wireless routers 2012-12-21

    I'm hoping to assign a specific local IP (ie 192.168.1.102) to a particular MAC address whenever this device connects with the Linksys wireless router. I've read that it's not recommended to turn off DHCP. How can I accomplish this otherwise? -------

  • How to assign a dynamically updating date to a user based on a related field on their profile 2013-05-19

    I have a site where Users who can expect a delivery to their address every week depending on their delivery route. I also have a Content Type of "Delivery Route" and a Content Type of "Delivery" with a Date field and an entity referenc

  • Configure DHCPD with assigned IP address and gateway on different subnets for KVM 2013-09-05

    I have a dedi with an IP range of 123.123.123.1/24, the problem is the gateway address: 111.111.111.254 and it's on completely different subnet. I have already setup a bridge and KVM virtualization. /etc/dhcpd.conf on host node. subnet 0.0.0.0 netmas

  • Getting route segments from OSM data and assigning ETA for them 2015-05-24

    I have a problem of assigning possible ETA for a route. So far, I have the following: OSM data for a city. I have open source data of taxi trails for the same city. Now, I am planning to divide the OSM data into route segments with a unique identifie

  • Using the ISP assigned IP behind a router 2015-10-01

    This question is more on networking than on programming, hence I am asking here on superuser. I am using google hangouts api and there I need to put my computer's ip in google developer console(currently app is in dev mode, hence we have to give the

  • Build Your Own AJAX Web Applications 2006-06-28

    So here you are, ready to learn all about this thing called AJAX. But, what exactly is it? The term AJAX refers to a loose grouping of technologies that are used to create dynamic, interactive web content. The term AJAX, originally coined by Jesse Ja

  • Frequent connection loss in CentOS 5.5 2010-10-18

    I have a CentOS 5.5 x64 server setup on a Intel Xeon based machine, For panel, I have installed VirtualMin. I'm facing a weird network problem, with following symptoms: When SSH-ing to the machine, or connecting via VNC it oftens says "connection res

  • Internet connection sharing between Windows XP and Windows 7 2011-01-03

    I bought my lil sister's netbooks for Christmas and I've been having a heck of a time trying to get Internet Connection Sharing to work. The host computer is a Windows XP box and it uses a US Cellular 3G modem dongle thingy to set it's Internet acces

  • Can my router code be improved? 2012-11-29

    I have created a nice url structure for my site. In my .htaccess I have: FallBackResource /index.php And in my router class I have: class init { function __construct($url) { $URLElements = explode('/', $url) ; // Adjust if needed. if($url) { $class =

  • BGP Prefix Announcement Issue 2013-05-22

    I'm having a weird issue. Here is the setup. We have 2 Foundry SX's. SX01 ---> ISPA | | SX02 ---> ISPB I have a /24 from ISPA and another /24 from ISPB. Both /24's are able to be announced to each of the providers. iBGP runs between the two SX's and

  • Workspace Navigation in Ubuntu 13.04 2013-08-07

    Folks I have this weird thingy, I assigned shortcuts to move a window to a numbered workspace, eg: Ctrl+2 will move the window to the 2nd workspace, but it just doesn't work, it just doesn't move the window to the workspace Any suggestions?! UPDATE:

  • Home Network Stopped Working 2013-11-05

    I have a home network where a machine running Windows 7 Ultimate N acts as a central hub for other devices to access media. This has been running for around 2 years now and there has been no recent configuration changes. The machine has a static IP a

iOS development

Android development

Python development

JAVA development

Development language

PHP development

Ruby development

search

Front-end development

Database

development tools

Open Platform

Javascript development

.NET development

cloud computing

server

Copyright (C) avrocks.com, All Rights Reserved.

processed in 0.924 (s). 13 q(s)