Annoying perhaps, but critical to the success of any networking, whether
local on your LAN or extending to the Internet as a whole. Simply put,
the netmask tells you which part of an IP address refers to the network
and which part identifies the particular host.

I know this already, it's very vague, cause all kinds of network types possible.

Also how to calculate this netmask in the head ?

Very hard to do requires calculating some bitmask and then converting that to decimals... ok I can do that.

Why not enter all this stuff in bits in the first place, maybe be a bit easier and prevent this conversion calculation.

Then the thing that gets even worse is this /24 specifier...

What is this supposed to mean ?

Also can netmasks be 10101010101 or always 1111111 ?

The first case is my guess, which makes very little sense.

Perhaps these guys trying to access their ziggo modems are talking about two different things:

1. The status page of the modem.
2. The menus of the modem.

They are trying to access 1, which is cut off from them, only from external it can be seen.

Not sure if these guys can access 2.

What would cause 2 to not be available ?

If I set my cable modem to bridge mode or some other crazy setting is there a chance the webserver won't work anymore ?

What setting would I have to set for the webserver to go missing ?

Also surely the IP address assigned to this webserver would be resetted if I reset the cable modem ?!

Even if not I already tried a scan of 192.168.x.x

However this can be done partiually...

later on the cable modem gets an ip from coax/isp. and this can no longer function... even windows refuses to send packets out, however the scan program happily continues.

One possibility to keep the cable modem operating at IP range 192.168.x.x would be to disconnect it from the internet by removing the coax cable.

I may try this later to perform an IP scan range on this device.

I do remember re-assing 192.168.100.1 to something more reasonable 0.100 or something or 0.254

But now I can't remember, apperently didn't document it, maybe it was even on different modem but I think it was on this.

May have to replace this modem cause not being able to enter it is kinda ****ty... and weird... hack concerns also.

Wish somebody could read out it's memory contents and check if it was hacked or so.

Another hypo is that ISP tried some experimental software update and it somehow failed.

Or my vaccum cleaner killed parts of it... still strange that it's functioning perfectly except the menu... seems more human intervention then by chance.

Bye,
Skybuck.