Linked Questions

0 votes
2 answers
2k views

IPv6 and /64 block allocation [duplicate]

I'm sure this is a FAQ, but I can't find any clear answer. From what I understand, IPv6 addresses should be allocated in /64 blocks. Many articles are warning against using anything less, which might ...
1 vote
2 answers
129 views

Again trouble with IPv6 [duplicate]

Possible Duplicate: How does IPv6 subnetting work and how does it differ from IPv4 subnetting? I have a IPv4-Subnet (/28) and a IPv6-Subnet (/64) - lets say the IPv4 Subnet is "87.240.70.144/28" ...
  • 29
472 votes
8 answers
179k views

How does IPv4 Subnetting Work?

This is a Canonical Question about IPv4 Subnets. Related: How does IPv6 subnetting work and how does it differ from IPv4 subnetting? How does Subnetting Work, and How do you do it by ...
126 votes
17 answers
55k views

Switching to IPv6 implies dropping NAT. Is that a good thing?

This is a Canonical Question about IPv6 and NAT Related: How does IPv6 subnetting work and how does it differ from IPv4 subnetting? How can I 'dip my toes' into dynamic IPv6 network ...
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20 votes
3 answers
3k views

IPv4 To IPv6 Migration Advice

I'm currently working on adding IPv6 capabilities to our network, and I have some questions on what is considered best practice in 2020 to convert some of the IPv4 concepts we are used to into the ...
6 votes
3 answers
2k views

/64 routed to my assigned IPv6 address?

So I have a vps provider for a linux server, it states this in my network dashboard on their site: 2607:f840:0044:0022:0000:0000:0000:0000/64 is routed to this server (2607:f840:0:3f:0:0:0:eaa) ...
  • 153
2 votes
2 answers
6k views

What's the difference between a subnet and a netblock?

I'm new to networking and am trying to get my terminology straight. I've Google this question but haven't found anything that clearly explains it.
  • 131
1 vote
1 answer
11k views

Sending netmask and gateway/route with dhcp for ipv6

I have setup a DHCP server to assign ipv6 to my clients. However, both the "routers" and "subnet" OPTIONS are ignored. I have read that ipv6 does not get theese from the DHCP, rather from the router ...
5 votes
2 answers
2k views

What IPv6 block should be whitelisted when a user asks to whitelist their IP?

Currently, on my IPv4-only service, users can whitelist their IP address which allows them to bypass email 2-factor authentication when they log in. When they do this we only whitelist that single IP ...
  • 151
3 votes
1 answer
3k views

IPv6 subnetting a dynamic /56 prefix

I read How does IPv6 subnetting work and how does it differ from IPv4 subnetting? but my question was not answered there. I'm upgrading our IPv4 network to IPv6. Currently, our NAT gateway splits our ...
  • 1,345
3 votes
1 answer
2k views

AWS CLI Elastic IP, IPv6

I have two AWS instances working in high availability. (I'm using keepalived) I have an Elastic IP associated, everything was a fine. I used this script so to change the instance IP in case o ...
1 vote
1 answer
1k views

How to start with IPv6 subnetting on linux gateway

We are currently having perfectly working IPv4 network with a typical layout - internal network with all servers splitted to VLANs in 10.0.0.0/8 (each vlan is /24) and external network with public ip ...
  • 1,543
0 votes
3 answers
415 views

IPv6: Creating ranges, range values

So I've just been assigned a /64 IP address range. I'm using SolusVM to manage virtual machines. With the /64, I am given the first 4 (octets? I think they're called) so my format is currently XXXX:...
  • 490
-2 votes
1 answer
262 views

Can I create IPv6 /48 addresses from IPv6 /64 block on my server? Or I need to request /48 block?

On my dedicated server and I have request from support IPv6 /48. For some reason they deliver to me IPv6 /64 like this IPv6 /64 2001.9d2.190.846v::2 Can I build /48 addresses from the IPv6 /64? Or I ...
0 votes
1 answer
143 views

IPv6 is here and confuses me

I'm starting to get emails from various services of this kind: Your gitlab.com account was signed in to from a new location Hostname gitlab.com IP Address 2001:db8:bbbb:1:cccc:dddd:eeee:ffff ...
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