IPv6 come abbiamo fatto in Ehiweb - 6lottino 2022 - MIX-it

Wed, 05 Apr 2023 21:17:06 +0100

A Ottobre 2022 sono stato ospite del 6lottino di MIX-it (https://mix-it.net/) dove ho presentato come abbiamo adottato IPv6 sulla nostra rete d’accesso nazionale (ADSL/FTTC/FTTH) di Ehiweb(https://www.ehiweb.it) a livello massivo su tutta la clientela.

Ho descritto il nostro piano di adozione, l’approccio e alcune sfide che abbiamo dovuto affrontare e risolvere.

Note

TL;DR Link al pdf della presentazione

IPv6 RADIUS Accounting

Wed, 29 Jun 2022 12:48:06 +0100

I’m struggling to understand why on accounting packets of my Cisco ASR1001-X with a dual stack configuration, the Delegated-IPv6-Prefix is not present at all.

In my configuration I’m using DHCPv6 PD and Delegated-IPv6-Prefix sent from the RADIUS server in Access-Accept response in every request.

I found that interesting article of and found the reason about it.

Basically you have to enable the feature with this command, keep in mind that it’s only supported from IOS 15.1.

aaa accounting include auth-profile delegated-ipv6-prefix

Here a screenshot of the Cisco documentation and to the official documentation about that command.

IPv6 subnetting in command line with sipcalc

Mon, 30 May 2022 09:17:06 +0100

I had to put my hands on my IPv6 network after lots of years… my memories are not so good…how to subnet a IPv6 network in command line?

What to do

I need to generate a pool of network /64, /60, /56 and /48 to assign to new customers from larger CIDR. Quickly and without painass.

Sipcalc

it’s an amazing tool for IPv4 and IPv6 calculations.

From the I found a perfect option to do this:

* -S, --v6split=MASK (IPv6)
 Split the current network into subnets of MASK size. MASK must be given in
 CIDR form, either with or with the '/' character.

Problem

For example, I have a /48 network and I want to split into /56

> sipcalc -u 2a01:b600:4000::/48 -S 56 |head -n 50

-[ipv6 : 2a01:b600:4000::/48] - 0

[Split network - verbose]
-[ipv6 : 2a01:b600:4000::/48] - 0

[IPV6 INFO]
Expanded Address - 2a01:b600:4000:0000:0000:0000:0000:0000
Compressed address - 2a01:b600:4000::
Subnet prefix (masked) - 2a01:b600:4000:0:0:0:0:0/56
Address ID (masked) - 0:0:0:0:0:0:0:0/56
Prefix address - ffff:ffff:ffff:ff00:0:0:0:0
Prefix length - 56
Address type - Aggregatable Global Unicast Addresses
Network range - 2a01:b600:4000:0000:0000:0000:0000:0000 -
 2a01:b600:4000:00ff:ffff:ffff:ffff:ffff

-
-[ipv6 : 2a01:b600:4000::/48] - 0

[IPV6 INFO]
Expanded Address - 2a01:b600:4000:0100:0000:0000:0000:0000
Compressed address - 2a01:b600:4000:100::
Subnet prefix (masked) - 2a01:b600:4000:100:0:0:0:0/56
Address ID (masked) - 0:0:0:0:0:0:0:0/56
Prefix address - ffff:ffff:ffff:ff00:0:0:0:0
Prefix length - 56
Address type - Aggregatable Global Unicast Addresses
Network range - 2a01:b600:4000:0100:0000:0000:0000:0000 -
 2a01:b600:4000:01ff:ffff:ffff:ffff:ffff

-
-[ipv6 : 2a01:b600:4000::/48] - 0

[IPV6 INFO]
Expanded Address - 2a01:b600:4000:0200:0000:0000:0000:0000
Compressed address - 2a01:b600:4000:200::
Subnet prefix (masked) - 2a01:b600:4000:200:0:0:0:0/56
Address ID (masked) - 0:0:0:0:0:0:0:0/56
Prefix address - ffff:ffff:ffff:ff00:0:0:0:0
Prefix length - 56
Address type - Aggregatable Global Unicast Addresses
Network range - 2a01:b600:4000:0200:0000:0000:0000:0000 -
 2a01:b600:4000:02ff:ffff:ffff:ffff:ffff

As you can see the result are the /48 network splitted with lots of info that can be useful or not.

As i need only the IPv6 address generated with the CIDR this is a output more useful (in this example the first 10 nets):

> sipcalc -u 2a01:b600:4000::/48 -S 56|grep 'prefix'|head -n 10
Subnet prefix (masked) - 2a01:b600:4000:0:0:0:0:0/56
Subnet prefix (masked) - 2a01:b600:4000:100:0:0:0:0/56
Subnet prefix (masked) - 2a01:b600:4000:200:0:0:0:0/56
Subnet prefix (masked) - 2a01:b600:4000:300:0:0:0:0/56
Subnet prefix (masked) - 2a01:b600:4000:400:0:0:0:0/56
Subnet prefix (masked) - 2a01:b600:4000:500:0:0:0:0/56
Subnet prefix (masked) - 2a01:b600:4000:600:0:0:0:0/56
Subnet prefix (masked) - 2a01:b600:4000:700:0:0:0:0/56
Subnet prefix (masked) - 2a01:b600:4000:800:0:0:0:0/56
Subnet prefix (masked) - 2a01:b600:4000:900:0:0:0:0/56

It’s done. You can generate all type of network split you want modifying the network size and split size.

Thanks for reading!

Ipv6 | sgala.com . website

IPv6 come abbiamo fatto in Ehiweb - 6lottino 2022 - MIX-it

IPv6 RADIUS Accounting

IPv6 subnetting in command line with sipcalc

What to do

Sipcalc

Problem