Tag Archives: scan

Cambium R195W cnPilot Routers Randomly Dropping

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The Problem

We have been experiencing a problem with our Cambium routers where they randomly drop and are unresponsive till a reboot. They’ll also stop handing out addresses on the LAN side.

A reboot “fixes” the problem, until it does it again. You can trigger the behavior by running a port scan against the router. Wondering if the CPU/Memory get overloaded?

nmap -T4 -A -v 192.168.11.1

While running a scan on the LAN side, the web interface slows down, but doesn’t seem to take it down as fast as a scan on the WAN side.

goahead.sh is a script that may be maxing out the cpu, but could be completely unrelated.

Resolution

Configuring the “Allowed Remote IP(IP1;IP2;)” to limit WAN access effectively blocks port scans and resolves the issue. Setting is under Administration -> Management -> Web Settings. You can add multiple ranges with

10.0.0.0/8;172.16.0.0/12;192.168.0.0/16
Configure Allowed Remote IP cnPilot R195W

It looks like the public ip ranges are limited to /24’s so if you you have a block of public IP addresses larger than a /24, you’ll need to break it down into 24’s to work properly.

Template for cnMaestro

You can also create a template in the Cambium Cloud so you can apply the change to multiple routers fairly easily.

Go to Configuration -> Templates and add a new template.

WebRemoteLegalIP=10.0.0.0/8;192.168.0.0/16;172.16.0.0/12
WebRemoteLegalIP template for cnMaestro

And then you can go to your device -> Configuration and apply your new config.

Apply Allowed WAN IPs Template

Do note that if you run a scan from an allowed range, it still seems to cause problems. But at least setting the Allowed Remote IPs will keep others from scanning your network and causing problems on your R195’s.

Baicells – nmap scan of eNodeB shows connected subscribers

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Doing a port scan on the 50000-59999 port range reveals all the connected subscriber modules.

Alfred@localhost:~$ nmap -p 1-65535 10.0.0.2
 Starting Nmap 7.60 ( https://nmap.org ) at 2019-09-30 23:55 CDT
 Nmap scan report for 10.0.0.2
 Host is up (0.026s latency).
 Not shown: 65520 closed ports
 PORT      STATE    SERVICE
 80/tcp    open     http
 7547/tcp  open     cwmp
 27149/tcp open     unknown
 59423/tcp open     unknown
 54984/tcp open     unknown
 51241/tcp open     unknown
 Nmap done: 1 IP address (1 host up) scanned in 19.18 seconds

Should be able to access the login page for the subscriber module by going to https://enodb-ip:xxxxx

Where xxxxx is the port number from the scan. Should be 5 with the last four IMSI numbers of the subscriber unit.