We are having Bad IP Assigment for many of our Locations. We have contacted the ISP's and verified the IP information, the ISP had to clear the ARC file in order for the Meraki to accept the Static IP. The Meraki's will work fine and then the Bad IP Assignment Error comes back after a day or two. Is anyone else experiencing this issue or have any input? I am going to contact the ISP's again but want to see if anyone on here has some useful input.
Thanks in advance.
I would need to better understand how the AP's are placed in the network topology to be able to give advice on this. Usually, bad IP assignment is related to VLAN's on the ports where the AP's are plugged in or incorrectly configured DHCP to the AP's, however as they are set with Static IP's, I guess it's not DHCP.
First; is this happening on MX security appliances or some other Meraki device (and if so, what)?
Assuming it is an MX how do you connect to the ISP? PPPoE? DHCP? Static IP?
I have looked at that article already. We have over 2500 Meraki's in our Company and we have about 60 MX devices having the same Bad IP Assignment Error. All of our Locations are connected to the modem via Static. The main provider that we are noticing that is giving us the main issue is Cox.
There is clearly some issue with ARP happening.
Lets check some basics. Could you give me the IP address, subnet mask and gateway on the WAN interface on one device with a problem. Please just put "x.x" for the first two octets to protect yourself. So change 126.96.36.199/255.255.255.252 to x.x.3.4/255.255.255.252/
Are the sites fed by fibre, or some other technology (such as bridged PPPoE)?
You are correct about the ARP issue, I have called the provider before to clear the ARP file and the Static starts working again but then it comes back after a day or two.
Static IP = xx.xx.217.138
Default Gateway = xx.xx.217.137
Subment Mask = 255.255.255.252
The Meraki Ignores the Static after showing the IP Error and gives me a DHCP IP of XX.XX.91.32
The connection is cable and they are not in PPPoe.
Your static configuration is correctly aligned, no issues there.
I found other people with other types of kit having the exactly the same issue.
So I think it is a common issue with this ISP.
Perhaps we can solve this a different way. Why do you need a static IP on the MX unit? Why can't you use the DHCP assigned address?
I note that the Cisco cable kit also has specific ARP filtering available. I wonder if your ISP uses this:
What version of firmware are you on? I just upgraded to the latest 13.24 and am now seeing the same issue with my sites on Cox. I did not see this issue previously when on version 12.24.
I assumed this issue was fixed in this update but apparently not.
We are still having the same IP Error but we have found out that Cox is using older modems with older firmware that is causing issues with our Meraki Firmware. I am in the process of replacing the modem in one of our problem locations with a newer modem and firmware to see if that resolved the issue
The modem is not the issue, so don't waste your time. We have the same issue as well. Its only with Cox and no other ISP at this point. I don't know all the specifics but what I can tell you is that it has to do with Cox's legacy platform (not modem specifically) and the backend devices. This started happening with the upgrade to 13.x code MX since Meraki changed how the static IP is added to the device. Before in the 12 code it was all or nothing. Now in 13.x they have a series of checks that the MX goes through, one being the gateway ARP. On the legacy Cox code it doesn't respond to the gateway arp because of either a bug or something else and the Meraki checks fail. This reverts it back to DHCP and gives you the "Bad IP assignment". Cox can clear the ARP on their end which allows the static IP again but since the gateway ARP check is still failing it gives you that alert still. If you were to change anything on the WAN IP page or reboot the MX it will cause it to fail back to DHCP and you will need to call in again.On Cox's new platform, the checks succeed so there is no issues. The only way right now to prevent the "bad IP" notice is to revert back to DHCP and stay there. This is what we did for the time being. Meraki Support is working with Cox and Cisco proper on a resolution. I ask for an update every other day and haven't got one yet.