We have just moved from PlusNet FTTC to IDNet/Cityfibre FTTP, we have
thus moved our old landline (that carried the FTTC) to VOIP. That's
all done and working now.
Our LAN is still 100% IPV4 and I'm thinking that maybe I should start
looking at getting IPV6 available. IDNet are always selling their IPV6 expertise and I want to do some more things with VOIP which is easier
(the VOIP bit anyway) with IPV6.
So where can I find some sort of tutorial to help me get started? My
WAN to LAN router is an Asus RT-BE92U which is IPV6 capable, most of
the computer hardware is running Debian 13, the VOIP is currently on a Yealink W70B.
What I need (initially anyway) is to get the block of IPV6 addresses
that IDNet have provided, available to use on the LAN side of the
router, then any new VOIP hardware can use one of these addresses. The existing IPV4 will have to continue as is. I run dnsmasq in the Asus
router to provide local DNS and DHCP, I think I need to enable IPV6 in
that.
However that's getting a bit detailed, as I said I want a sort of
generic tutorial to tell me what's involved with getting IPV6 working
in parallel with IPV4. I'm particularly concerned about firewalls and
such given that (I think) one loses the protection that NAT gives.
Chris Green <cl@isbd.net> wrote:
We have just moved from PlusNet FTTC to IDNet/Cityfibre FTTP, we have
thus moved our old landline (that carried the FTTC) to VOIP. That's
all done and working now.
Our LAN is still 100% IPV4 and I'm thinking that maybe I should start looking at getting IPV6 available. IDNet are always selling their IPV6 expertise and I want to do some more things with VOIP which is easier
(the VOIP bit anyway) with IPV6.
So where can I find some sort of tutorial to help me get started? My
WAN to LAN router is an Asus RT-BE92U which is IPV6 capable, most of
the computer hardware is running Debian 13, the VOIP is currently on a Yealink W70B.
What I need (initially anyway) is to get the block of IPV6 addresses
that IDNet have provided, available to use on the LAN side of the
router, then any new VOIP hardware can use one of these addresses. The existing IPV4 will have to continue as is. I run dnsmasq in the Asus router to provide local DNS and DHCP, I think I need to enable IPV6 in that.
However that's getting a bit detailed, as I said I want a sort of
generic tutorial to tell me what's involved with getting IPV6 working
in parallel with IPV4. I'm particularly concerned about firewalls and
such given that (I think) one loses the protection that NAT gives.
ThererCOs any number of tutorials findable on the web. IrCOm no great expert but I do have an IDnet/Cityfibre connection. They supplied the Asus router preconfigured, but IrCOm pretty sure they will help you set yours up. Their tech support is excellent. With the router so set up, the LAN just works.
The router does all the firewalling, no need for NAT. Any IPv6 capable
device just picks up an address in parallel to any IPv4 one.
This https://ipv6.chappell-family.com/ipv6tcptest/ can be used to check yourCOve got your firewall configured correctly.
Tweed <usenet.tweed@gmail.com> wrote:
ThererCOs any number of tutorials findable on the web. IrCOm no great expert
but I do have an IDnet/Cityfibre connection. They supplied the Asus router preconfigured, but IrCOm pretty sure they will help you set yours up. Their tech support is excellent. With the router so set up, the LAN just works. The router does all the firewalling, no need for NAT. Any IPv6 capable device just picks up an address in parallel to any IPv4 one.
This https://ipv6.chappell-family.com/ipv6tcptest/ can be used to check yourCOve got your firewall configured correctly.
Thanks, that's encouraging, maybe it's not as difficult as I thought! :-)
We have just moved from PlusNet FTTC to IDNet/Cityfibre FTTP, we have
thus moved our old landline (that carried the FTTC) to VOIP. That's
all done and working now.
Our LAN is still 100% IPV4 and I'm thinking that maybe I should start
looking at getting IPV6 available. IDNet are always selling their IPV6 >expertise and I want to do some more things with VOIP which is easier
(the VOIP bit anyway) with IPV6.
So where can I find some sort of tutorial to help me get started? My
WAN to LAN router is an Asus RT-BE92U which is IPV6 capable, most of
the computer hardware is running Debian 13, the VOIP is currently on a >Yealink W70B.
What I need (initially anyway) is to get the block of IPV6 addresses
that IDNet have provided, available to use on the LAN side of the
router, then any new VOIP hardware can use one of these addresses. The >existing IPV4 will have to continue as is. I run dnsmasq in the Asus
router to provide local DNS and DHCP, I think I need to enable IPV6 in
that.
However that's getting a bit detailed, as I said I want a sort of
generic tutorial to tell me what's involved with getting IPV6 working
in parallel with IPV4. I'm particularly concerned about firewalls and
such given that (I think) one loses the protection that NAT gives.
On Sat, 1 Nov 2025 18:24:29 +0000, Chris Green <cl@isbd.net> wrote:
We have just moved from PlusNet FTTC to IDNet/Cityfibre FTTP, we have
thus moved our old landline (that carried the FTTC) to VOIP. That's
all done and working now.
Our LAN is still 100% IPV4 and I'm thinking that maybe I should start
looking at getting IPV6 available. IDNet are always selling their IPV6
expertise and I want to do some more things with VOIP which is easier
(the VOIP bit anyway) with IPV6.
So where can I find some sort of tutorial to help me get started? My
WAN to LAN router is an Asus RT-BE92U which is IPV6 capable, most of
the computer hardware is running Debian 13, the VOIP is currently on a
Yealink W70B.
What I need (initially anyway) is to get the block of IPV6 addresses
that IDNet have provided, available to use on the LAN side of the
router, then any new VOIP hardware can use one of these addresses. The
existing IPV4 will have to continue as is. I run dnsmasq in the Asus
router to provide local DNS and DHCP, I think I need to enable IPV6 in
that.
However that's getting a bit detailed, as I said I want a sort of
generic tutorial to tell me what's involved with getting IPV6 working
in parallel with IPV4. I'm particularly concerned about firewalls and
such given that (I think) one loses the protection that NAT gives.
With an Asus router it's quite simple.
In the settings click on IPv6 under the Advanced Settings heading.
That will tell you, by showing you the IPv6 address, if the router and
line are already configured/enabled for IPv6.
If not, on the same page, you need Connection type Native; Interface
PPP; DHCP-PD Enable; Accept Default Route Enable; Connect to DNS
server automatically Enable; Enable Router Adverisement Enable. Some
of these are defaults so you wont't have to change all of them.
Reboot the router.
When rebooted return to the same page and see if you have an IPv6
address. If not call/email IDNet and ask them to enable your circuit.
What are the advantages of IPV6?
Why don't ISPs that support it, such as ZEN dish out a V6 as standard?
If I don't have DHCP can it cope when I move to a different subnet?
David Wade <g4ugm@dave.invalid> wrote:
What are the advantages of IPV6?
- being able to reach parts of the internet that are IPv6 only
- increased speed, by not having to traverse NAT/CGNAT/frontend servers at
the destination
- ease of hosting your own services (both locally and at datacentres,
without having to pay your host extra to rent an IPv4 address)
- end to end connectivity without NAT traversal hacks
Why don't ISPs that support it, such as ZEN dish out a V6 as standard?
I don't know why Zen doesn't enable it as standard - mainstream ISPs like BT, Vodafone and Sky do, and it 'just works'. Most people using IPv6 don't know they are.
If I don't have DHCP can it cope when I move to a different subnet?
Yes, the router just broadcasts a new subnet and hosts pick that up and renumber. If you want to talk to hosts locally using their global IP there are ways, eg mDNS.
(I'm not sure in practice how frequently domestic IPv6 networks do get renumbered, I think the recommendation is there's a static mapping)
Theo
Why don't ISPs that support it, such as ZEN dish out a V6 as standard?
I don't know why Zen doesn't enable it as standard - mainstream ISPs like BT,
Vodafone and Sky do, and it 'just works'. Most people using IPv6 don't know >> they are.
I was with Plusnet before, and they still don't support it....
.. I'll see if ZEN will turn it on.
On 05/11/2025 11:30, Theo wrote:
David Wade <g4ugm@dave.invalid> wrote:
If I don't have DHCP can it cope when I move to a different subnet?
Yes, the router just broadcasts a new subnet and hosts pick that up and renumber. If you want to talk to hosts locally using their global IP there are ways, eg mDNS.
(I'm not sure in practice how frequently domestic IPv6 networks do get renumbered, I think the recommendation is there's a static mapping)
It was more if I go to a different place. I have a second home and kept
the WiFi SSIDs the same....
David Wade <g4ugm@dave.invalid> wrote:
On 05/11/2025 11:30, Theo wrote:
David Wade <g4ugm@dave.invalid> wrote:
If I don't have DHCP can it cope when I move to a different subnet?
Yes, the router just broadcasts a new subnet and hosts pick that up and
renumber. If you want to talk to hosts locally using their global IP there >>> are ways, eg mDNS.
(I'm not sure in practice how frequently domestic IPv6 networks do get
renumbered, I think the recommendation is there's a static mapping)
It was more if I go to a different place. I have a second home and kept
the WiFi SSIDs the same....
Since your second home will have a different upstream connection, I'd have thought you'd expect different public IPs? The wifi SSIDs don't affect how machines get IP addressed.
If you have multiple upstreams, it's possible to declare a private subnet in the fc00::/10 range and then set your router to do a 1:1 stateless NAT that to an upstream address in your ISP's range 2001:aaaa:bbbb:cccc::/64, eg fc00::12:34:56 gets NATted to 2001:aaaa:bbbb:cccc::12:34:56. That means you are insulated from your upstream IP but still have the benefits of IPv6 (without the disbenefits of IPv4 stateful NAT).
Theo
So in the main house I have a Fritz!Box on a ZEN FTTP connection, but
this has a second router, a Draytek with its WAN port plugged into one
of the Fritz! LAN ports. The Fritz!Box forwards most inbound connections
to to the Draytek. There are some WiFi access points plugged into the Draytek.
On checking the APs seem to be only manageable via IPV4 but I assume
they appear to pass IPV6 traffic correctly (They are Draytek AP902s)
This is a hang-over from when I had VDSL and the Draytek was the primary router. I think I need to flatten the network
In the holiday home there is a Huawei router which I can't change as the fibre goes directly into it. Its connection is IP4 only on CGNAT. There
is a second Fritz!Box which creates a VPN back into the UK which I tend
to only use for TV.
David Wade wrote:
[snip]
So in the main house I have a Fritz!Box on a ZEN FTTP connection, but
this has a second router, a Draytek with its WAN port plugged into one
of the Fritz! LAN ports. The Fritz!Box forwards most inbound
connections to to the Draytek. There are some WiFi access points
plugged into the Draytek.
There is no need whatever for the Fritz!Box.-a Remove it, and connect
your Draytek WAN port to the ONT.-a Use the Zen credentials in the
Draytek WAN port.
On checking the APs seem to be only manageable via IPV4 but I assume
they appear to pass IPV6 traffic correctly (They are Draytek AP902s)
This is a hang-over from when I had VDSL and the Draytek was the
primary router. I think I need to flatten the network
In the holiday home there is a Huawei router which I can't change as
the fibre goes directly into it. Its connection is IP4 only on CGNAT.
There is a second Fritz!Box which creates a VPN back into the UK which
I tend to only use for TV.
So that may be why you use the Fritz!Box in the UK.-a But you could
create a LAN-to-LAN VPN with a Draytek router in the holiday home.-a I've done this a lot, for customer support.-a Where there was CGNAT at the customer site, I configured the VPN to use PPTP so the customer site
dialled in to my home router, and the connection was always-on.-a There
may be more secure methods.
Yes, the router just broadcasts a new subnet and hosts pick that up and renumber. If you want to talk to hosts locally using their global IP there are ways, eg mDNS.
(I'm not sure in practice how frequently domestic IPv6 networks do get renumbered, I think the recommendation is there's a static mapping)
On 05/11/2025 11:30, Theo wrote:
David Wade <g4ugm@dave.invalid> wrote:
What are the advantages of IPV6?
- being able to reach parts of the internet that are IPv6 only
any examples of this? Never found any so far?
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