DHCP Issues

[Bangflop]

So I accidentally deleted a device off of my DHCP list from my router and now that device will not connect to the internet via Ethernet (which is what I need it to connect via).

 

My question is, is there any way to add that device back to the DHCP list so that my router will recognize it and restore the internet access?

 

If you are wondering, the device in question is a Raspberry Pi 2 Model B.

 

 

As always, thanks for the help

[2FA]

What does the DHCP list page look like on your router?

[Bangflop]

What does the DHCP list page look like on your router?

It just has all the connected devices on there with all their information listed as well... from there I can specify if I want it to be static or not.

[2FA]

Have you tried resetting your router? As in holding the reset button and setting everything to default? I can't see what your router control looks like so my help is very limited. Whatever company makes your router, you can try contacting their support.

[Bangflop]

Have you tried resetting your router? As in holding the reset button and setting everything to default? I can't see what your router control looks like so my help is very limited. Whatever company makes your router, you can try contacting their support.

This is not my actual page but this is what it looks like...

 

https://gyazo.com/60a68fc51f7ef9a8bec1a7e1f6d683f2

[2FA]

192.168.x.x are private IP addresses. Just create a new static connection for the Pi and use an address similar to the one already there, an example being 192.168.1.14.

[Bangflop]

192.168.x.x are private IP addresses. Just create a new static connection for the Pi and use an address similar to the one already there, an example being 192.168.1.14.

I did that just now and it said that it was expired so I tested it and I had 4 packets sent and 0 received with a 100% packet loss. Any thoughts?

[Bangflop]

192.168.x.x are private IP addresses. Just create a new static connection for the Pi and use an address similar to the one already there, an example being 192.168.1.14.

Also the Pi isn't even showing up on my network...

[2FA]

No ideas.

[brwainer]

Your devuce being present in the list of DHCP addresses means nothing if the device itself doesn't know about the address. Reboot the raspberry pi and reconnect it to the network. This will cause it to ask for a new IP address, unless it has been configured to use a static IP address.

[goneflyin1]

Im assuming you have Linux installed on the pi. Either restart it or open a terminal window (Ctrl+Alt+T) and type

sudo ifconfig eth0 down

Wait about 10 seconds then type

sudo ifconfig eth0 up

Those are zeroes not o's. This will send a new dhcp discovery packet. If this doesn't work you will need to configure a static ip to return to the networw, which means you probably blacklisted the device on your router. If you don't know how to configure a static ip post what os and distro you have on the pi.

[Bangflop]

Your devuce being present in the list of DHCP addresses means nothing if the device itself doesn't know about the address. Reboot the raspberry pi and reconnect it to the network. This will cause it to ask for a new IP address, unless it has been configured to use a static IP address.

Yeah I did that probably 20 times... I even forced a static DHCP on it and non of the packets were received when I tested it.

 

I do not have an IP of the device anymore and the network does not even see it on there.

[Bangflop]

Those are zeroes not o's. This will send a new dhcp discovery packet. If this doesn't work you will need to configure a static ip to return to the networw, which means you probably blacklisted the device on your router. If you don't know how to configure a static ip post what os and distro you have on the pi.

I am using the Raspbian OS on my Pi.

 

My network does not even see the device listed and when I do ifconfig on the Pi, it does not have an IP address at all.

[Guest]

Just reboot your router: it will dump the lease table.

[MeshFile]

The problem is with the Pi since checking its IP address using ifconfig doesn't display any IP. Put static IP on it and verify if devices can ping that new IP or by using wnetwatcher or similar subnet scanner.

[goneflyin1]

Setting a static IP on the router isnt setting a static IP, its instead called a DHCP reservation, and since you showed a screenshot of a ISP provided router, Im guessing it prevents that that IP from being issued via DHCP instead of issuing it via DHCP.  You have to use the network manager in raspbian to set a static IP on the raspberry pi.  Navigate to settings, network, IPv4 settings and set the IP there.  You should do an ipconfig via the command prompt(if you have a windows machine currently on the network) or ifconfig on another linux machine, but if you have the standard settings these will work:

 

IP: 192.168.1.254 (Doing a high number just to ensure the IP isnt already assigned via DHCP) 

netmask 255.255.255.0

Default Gateway: 192.168.1.1

DNS 8.8.8.8 (Google's public IP just to eliminate this issue as well)

 

EDIT: You should then ping the raspberry pi from another machine on the network.  If this doesnt work, send in the results of ifconfig/ipconfig from a machine currently connected to the network to give you the correct IP configuration settings.

[Bangflop]

Just reboot your router: it will dump the lease table.

No good

[goneflyin1]

It sounds like you have blacklisted your pi's MAC address. Have you checked the router for rejecting packets based on physical address? A quick google search shows it would be under the firewall tab

[yzbd]

Dude just do a factory reset on your router since your having such a hard time fixing your problem. Find the reset button on your router (more than likely is paperclip size hole). Hold it down for at least 90 seconds. The router will be just like the first day you got it - you will need to re-setup your ssid and password and other settings, but you will be able to connect all your devices. 

 

If this doesn't fix your issue then you are seriously doing something wrong.