Unable to configure port forwarding

[surreydude]

I already have some port forwarding rules configured on my hub. Just tried to add a new rule and it doesn't work - it insists that any IP address I add is invalid ("192.168.0.XXX is not a valid IP address")

I note that this has be raised by a few other people.

Is there a know issue with firmware? Anyone know of a resolution?

Thanks

Hub 4 device information

The information below shows current status of this Hub 4.

Standard specification compliant	: DOCSIS 3.1
Hardware version	: 11
Software version	: AR01.04.055.06.07_040722_7245.PC20.10.LG.X1

c.f. https://community.virginmedia.com/t5/Networking-and-WiFi/Port-Forwarding-page-broken/m-p/5265078

[VMUser1812]

This issue has been mentioned once or twice on here. Is the IP address of the device within the DHCP range? There have been some suggestion that a bug in the hub's firmware produces the exact result you are experiencing unless the address of the device is within the DHCP range.

[surreydude]

I don't use the DHCP - the existing rules work fine

[Roger_Gooner]

The way I've done it is to fix the device's IP address within the DHCP reservation range and then port forward. I use my own router but the process is the same. I've got my Synology NAS on 192.168.1.191 and after port forwarding using port 5000 I can access the NAS by using this URL:

http://192.168.1.191:5000/

[surreydude]

One of my existing devices also is a Synology NAS and that works - no DHCP reservation.

I'm trying to add 192.168.0.250 - it's within the existing range, however, DHCP is disabled. Other devices outside of the disabled range forward without problems.

[Roger_Gooner]

So what device is doing DHCP?

[surreydude]

A router. But most of my devices don't use DHCP, including those for forwarding.

[legacy1]

use hub in modem mode with a router that works 

[Roger_Gooner]

Port forward with the router and with hub in modem mode.