ipv6 advertise route

Posted on 2012-09-19
Medium Priority
Last Modified: 2012-10-04
I have customer A IP address as 2001: 0410:0001::/48 and customer B as 2001:0410:0002::/48. Both customers are going to an ISP and the ISP will advertise the route as 2001:0410::/35. I understand the CIDR business. But I don't understand 35 bits of /35 in relation to the 2001:0410::
I understand the 48 bits from /48. But how do you get /35 out of 2001:0410::

Question by:biggynet
LVL 19

Accepted Solution

bevhost earned 1000 total points
ID: 38416164
Each block of 4 hex digits is 16 bits.
2001 is 16 bits
0410 is 16 bits
2001:0410::/32 is 32 bits
2001:0410:0 is 36 bits
2001:0410:00 is 40 bits
2001:0410:000 is 44 bits
2001:0410:0000 is 48 bits.

2001:0410::/35 is

IPv6 address      2001:0410:0000:0000:0000:0000:0000:0000       (2001:410::)
Prefix length      35
Network start      2001:0410:0000:0000:0000:0000:0000:0000       (2001:410::)
Network end      2001:0410:1fff:ffff:ffff:ffff:ffff:ffff       (2001:410:1fff:ffff:ffff:ffff:ffff:ffff)
Netmask      ffff:ffff:e000:0000:0000:0000:0000:0000       (ffff:ffff:e000::)
LVL 17

Assisted Solution

pergr earned 1000 total points
ID: 38416974
Doing the last two rows in hex is really confusing.
Doing them in binary makes it clearer, but 128 bits is really long...............................

That why subnetting on "nimble" (48/44/40/36...) makes things much easier to read - and much easier to do reverse DNS for.

Note that the next network, after 2001:0410::/35 is 2001:0410:2::/35.

Featured Post

Prep for the ITIL® Foundation Certification Exam

December’s Course of the Month is now available! Enroll to learn ITIL® Foundation best practices for delivering IT services effectively and efficiently.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Make the most of your online learning experience.
This article explains the fundamentals of industrial networking which ultimately is the backbone network which is providing communications for process devices like robots and other not so interesting stuff.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.

839 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question