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Subnetting question - Plusnet Hub2

greygit1
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Subnetting question - Plusnet Hub2

I'm sure I'm not being totally daft here.

I can change the subnet to a /26

Screenshot 2024-03-22 093726.jpg

 

I can change the subnet to a /27

Screenshot 2024-03-22 093550.jpg

I can change the subnet to a /29 (which is what it is currently running with)

Screenshot 2024-03-22 093333.jpg

 

I cannot change the subnet to a /28

Screenshot 2024-03-22 093421.jpg

I've changed the networks around from defaults, moved the gateway address, but get the same results with trying to get a /28 network (the same error crops up).

? Anyone else seeing this ? 'Feature' of the Hub2 ? Or am I doing summink wrong ?

16 REPLIES 16
Dan_the_Van
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Re: Subnetting question - Plusnet Hub2

@greygit1 

Maybe you have some spare time on your hands, but I am trying understand why you would want to limit the number of devices on your network to 14 or less?

I would suggest the average household user would not even consider changing the network mask as it has no benefits.

As I have posted before I do find the Hub Two DHCP server not the best, I have considered outsourcing the Hub's DHCP server function to a pi-hole which I run but I have never got round to it.

 

 

 

greygit1
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Re: Subnetting question - Plusnet Hub2

Spare time? A matter of minutes.

The subnetting isn't directly connected with DHCP. Or shouldn't be.

Dan_the_Van
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Re: Subnetting question - Plusnet Hub2

Subnetting and DHCP pool settings are connected?
jab1
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Re: Subnetting question - Plusnet Hub2

@Dan_the_Van  - no. 😀

John
Dan_the_Van
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Re: Subnetting question - Plusnet Hub2

@jab1 

Wouldn't you need to ensure the DHCP pool is within the available IP address range defined by the netmask, so indirectly it does. 

jab1
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Re: Subnetting question - Plusnet Hub2

OK - I take your point. Don't know why I got involved in this, though.😀

John
MisterW
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Re: Subnetting question - Plusnet Hub2

Wouldn't you need to ensure the DHCP pool is within the available IP address range defined by the netmask,

Yes!

Superusers are not staff, but they do have a direct line of communication into the business in order to raise issues, concerns and feedback from the community.

greygit1
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Re: Subnetting question - Plusnet Hub2

It's a bit odd.

The active DHCP range is within a /29 (as are all active IP addresses, as visible in My Network, and via the log entries), the gateway address is excluded from the DHCP range (but within the network), but the Hub2 refuses to accept a /28 netmask. And all IP addresses (and the DHCP pool) would be within that range of addresses <shrug>.

I may turn off DHCP and use statics to see whether the Hub2 then allows a /28. Just to exclude oddities in the code related to DHCP (and interactions with subnetting).

I might also define the start of the network at a /29 boundary and see whether the Hub2 has other (as yet unseen by me) 'features'.

greygit1
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Re: Subnetting question - Plusnet Hub2

I like carving up networks. The apparent functionality is there on the Hub2, but there appears to be an anomaly.

I could work with a /27 (and I have been). I can also (currently) work with a /29. But apparently a /28 isn't an option (which suggests a 'feature' in the Hub2),

All I was asking is whether others have seen similar, have I ballsed up the netmask (well, no-one's picked on that yet).

jab1
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Re: Subnetting question - Plusnet Hub2


@greygit1 wrote:

I like carving up networks. 


To what end?

 

John
Dan_the_Van
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Re: Subnetting question - Plusnet Hub2


@greygit1 wrote:

I like carving up networks. The apparent functionality is there on the Hub2, but there appears to be an anomaly.

I could work with a /27 (and I have been). I can also (currently) work with a /29. But apparently a /28 isn't an option (which suggests a 'feature' in the Hub2)


For 192.168.1.0/28 and 192.168.1.240/28

Screenshot 2024-03-24 080437.png     Screenshot 2024-03-24 082121.png

I like carving up networks

For what purpose? Is it really necessary to only have 13 useable IP addresses, one IP set aside for the router.

I very much doubt plusnet will rush to resolve this feature as it is not causing a service issue and does not make it less usable. 

 

 

 

Champnet
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Re: Subnetting question - Plusnet Hub2

Am I missing something ?

My simple setup :

192.168.1.100 - 192.168.1.200 DHCP :  Phones & Tablets etc, everything else is fixed.

192.168.1.0   - 29   IT kit, Servers & VMs, Routers, Printers etc

192.168.1.30 - 49   Desktops & Laptops

192.168.1.50 - 69   IP Cameras & associated kit

192.168.1.70 - 99  Entertainment, TVs, Sonos kit etc

 

Dan_the_Van
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Re: Subnetting question - Plusnet Hub2

@Champnet 

My understanding is the OP wants to set the Hub Two to use a 28 bit netmask (255.255.255.240), which the Hub is not allowing him to do. Using anything less than a 24 bit mask will limit the number of available IP Addresses for a Class C network

My point is why would he want to do this, if this is a defect of the Hub Two would plusnet even look to fix it?

Like you I have selected IP Addresses ranges for specific devices, however they are on the same network which has 254 available IP Addresses.

 

 

Champnet
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Re: Subnetting question - Plusnet Hub2

Either in a commecial or home environment the simple solutions are usually the best, especially when it comes to troubleshooting.........