DHCP assigning bad ip addresses

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fastcountach
DD-WRT Novice


Joined: 24 Feb 2016
Posts: 2

PostPosted: Wed Feb 24, 2016 5:06    Post subject: DHCP assigning bad ip addresses Reply with quote
First, im using DD-WRT v24-sp2 (12/15/14) big - build 25648

My router keeps assigning random clients (wired and wireless) bad ip addresses (192.168.81.xxx)

It seems to be doing it one client at a time. I will set a static IP on that client. then couple hours later it will assign another one a bad IP address.

I only have the 1 router, no additional switches or access point.

I have just tried using reserved IP per MAC address. This didn't seem to work at all.

I have tried this with and without DNSMasq.

Do i have a setting off somewhere?
Do i have to reboot the router between changing DNSMasq or adding reserved IPs?

Setting static IPs on the clients works, but i feel like i shouldn't have to do that (especially for one devices i have where i don't think i can do that. I feel like its only a matter of time before it gets a bad IP address)
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eibgrad
DD-WRT Guru


Joined: 18 Sep 2010
Posts: 4734

PostPosted: Fri Feb 26, 2016 1:43    Post subject: Reply with quote
192.168.81.xxx is a valid ip address ... if you're using the 192.168.81.0/24 network.

So what makes that a "bad" address? Are you saying your network is 192.168.1.0/24, but for some reason, every once and awhile, DHCP is returning a random "8" in the third octet of the IP address?
fastcountach
DD-WRT Novice


Joined: 24 Feb 2016
Posts: 2

PostPosted: Wed Mar 23, 2016 23:36    Post subject: Reply with quote
Your second question is what is happening. Every once in a while the third octet has an "8". My gateway is the standard 192.168.1.1

Anyway, my workaround seems to be working. But what i am finding is that Reserved IP address only work for wired connections. Not wireless. So wireless devices I have to assign a static IP.

Also, I am having other difficulties with this build, unrelated to this problem. But I'll report those somewhere else...
Murrkf
DD-WRT Guru


Joined: 22 Sep 2008
Posts: 12635

PostPosted: Thu Mar 24, 2016 9:35    Post subject: Reply with quote
What other shop server do you have on the network?
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cdmarshall
DD-WRT User


Joined: 09 Jul 2014
Posts: 287

PostPosted: Fri Mar 25, 2016 4:16    Post subject: Reply with quote
I agree. something else on your network is handing out DHCP addresses.
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