Setting up IPv6 on ASUS Router Connected to Smarthub 2 with BT 900 Fibre

[TimCurtis]

@IainMcFarlane 

Re the subnet mask,this is how I think it works.

When you use 255.255.255.0 then within your network you can only access devices with the same first 3 parts of the address the same , ie 192.168.1 to 192.168.1.255.

When you use something like 255.255.252.0 then it's more like 192.168.0.1 to 192.168.3.254. In truth I copied what someone else had done successfully and I'm thinking this is the logic behind it.

In my situation my Asus is 192.168.1.1 and my SH2 is 192.168.2.1 and the Asus port is set to 192.168.2.2 and I can see either device from either device but with 255.255.255.0 I don't think I could.

I'm sure I can be corrected in my thinking here 😊

Also I said that the Asus app didn't work when not on my local network , well that's incorrect as it does.

[licquorice]

@TimCurtis  That's correct. The subnet mask determines how many bits of the address are network and how many are hosts. The 255.255.255.0 mask gives a /24 network i.e 24 bits for network with 8 bits for hosts giving 256 hosts. 255.255.252.0 is a /22 network with 1024 hosts.

[TimCurtis]

@licquorice 

Lucky guess on my part 🙂

@IainMcFarlane 

Just to add that I use the Asus DDNS service and even with the Asus not directly connected to the internet that DDNS name is kept up-to-date as the Asus does a check every 6 hours and if a internet connection is reset. That may only be true of the later firmware versions though.

[countrypaul]

@IainMcFarlane 

Re the subnet mask,this is how I think it works.

When you use 255.255.255.0 then within your network you can only access devices with the same first 3 parts of the address the same , ie 192.168.1 to 192.168.1.255.

When you use something like 255.255.252.0 then it's more like 192.168.0.1 to 192.168.3.254. In truth I copied what someone else had done successfully and I'm thinking this is the logic behind it.

In my situation my Asus is 192.168.1.1 and my SH2 is 192.168.2.1 and the Asus port is set to 192.168.2.2 and I can see either device from either device but with 255.255.255.0 I don't think I could.

I'm sure I can be corrected in my thinking here

Also I said that the Asus app didn't work when not on my local network , well that's incorrect as it does.

@TimCurtis 

The range of addresses for a /22 mask should be from .0.0 to .2.255, some routers use 192.168.2.0 and some use 192.168.2.255 for the actual router address. But whilst technically these end of range addresses are usable, some devices do not handle them properly so generally best avoided.

[licquorice]

.255 shouldn't be used as that is a broadcast address for that network.

[TimCurtis]

When I referred to 192.168.1.255 in my post above that was a typo and obviously should have been 192.168.1.254.

[IainMcFarlane]

Tim

coming back to this post as I would like to be able to have devices see each other accross my 2 networks (especilly when it comes to connecting to streaming amps etc.

Do I change the subnet mask to 255.255.252.0  on both routers ?

I would like to make the changes but not muck it up as I do not fancy resetting everything and having to go back through all the setup.

Will I have to turn off one of the DHCP and then allocate fixed IP addresses between the routers or will they both happily coexist as long as they are on basically different IP ranges?

[licquorice]

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@IainMcFarlane wrote:

Tim

coming back to this post as I would like to be able to have devices see each other accross my 2 networks (especilly when it comes to connecting to streaming amps etc.

Do I change the subnet mask to 255.255.252.0  on both routers ?

Yes

I would like to make the changes but not muck it up as I do not fancy resetting everything and having to go back through all the setup.

Will I have to turn off one of the DHCP and then allocate fixed IP addresses between the routers or will they both happily coexist as long as they are on basically different IP ranges?

They will coexist, the range you set on each will be different.

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[IainMcFarlane]

Tim

thanks, will make a point of having a go at this tomorrow!! (need to pluck up the courage 😄 )

[IainMcFarlane]

Hi all

i have tried to update the Subnets on my routers, the BT router has updated fine, but when I go onto the ASUS I get an error message saying “WAN and LAN should have different IP addresses and subnet 

also even with the 252 subnet on the BT I am still struggling to see anything on the ASUS router currently ! It’s not a killer for me but would be great to have full visibility across my networks !