PMP 450 Configuration

Products PMP
1

Christopher Durnford Today, 3:32 PM

I manage a small network (150 subscriber modules, 15 AP’s. I am using PMP 450 radios, with cnmatrix switches. I have an issue where a customer will plug their wifi router in backwards and send out IP’s to other subscribers on the network. How can this be stopped? It is way too easy for a customer to cause major issues…there has to be a way to stop this. Can someone please help?

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You can accomplish this either by using filters on the SM or by setting the SM to NAT mode.

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What filters would I need to use to stop the SM from giving out IP’s to other SM’s on the network?

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Just google it… “what port and protocol does DHCP use?”

" AI Overview

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DHCP, or Dynamic Host Configuration Protocol, uses the UDP (User Datagram Protocol) for its communication and relies on two specific port numbers: 67 and 68. DHCP clients use UDP port 68 to send requests, while DHCP servers use UDP port 67 to listen for and respond to those requests.

Here’s a more detailed breakdown:

DHCP utilizes UDP because it is a connectionless protocol, meaning it doesn’t require a persistent connection between the client and server, making it faster and more efficient for initial IP address allocation.

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This is the designated port for DHCP servers to listen for incoming client requests.

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This port is used by DHCP clients to send their requests to the DHCP server.

In essence, when a device joins a network and needs an IP address, it sends a request (a DHCP Discover message) to port 67. The DHCP server, listening on that port, responds with an offer (a DHCP Offer message) on port 68. The client then acknowledges the offer (DHCP Request) on port 67, and the server confirms the allocation (DHCP ACK) on port 68, completing the process."

5

Just to clarify…right now all PMP radios are in Bridge mode and all SM’s get public IP’s from a cisco router. The problem is that once 1 customer plugs their router in backwards, that customers radio is also sending out IP’s, and some SM’s pickup a IP from that router instead of the public IP pool on my router. So, how can I prevent this from happening, while still allowing SM’s to get a public IP from our router?

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7

Thank you! Would you (or anyone) happen to have a valid script for this so I can load to all SM’s through maestro?

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I have a valid script now. Thank you so much for your help!

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Is there a similar feature in the ePMP product line? I know of the “DHCP Server Below SM” setting that is default disabled. This does not prevent the issue as described in this thread…

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For ePMP regarding this topic, the “DHCP Server Below SM” setting works as intended.

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Please share the script?

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{
  "userParameters": {
    "networkConfig": {
      "packetFilterBootpServer": 1,
      "packetFilterDirection": 1
    }
  },
  "configFileParameters": {
    "rebootIfRequired": true
  },
  "cfgFileString": "Canopy configuration file",
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