87
votes
Accepted
Is "IPv10" a joke or a serious RFC draft?
As Ron said, anyone can write a proposal. I have a hard time taking proposals seriously from someone who suggests interconnecting satellites with optical fiber, though.
Also, I can't imagine this ...
- 17.1k
28
votes
Is "IPv10" a joke or a serious RFC draft?
You must remember that anyone can submit proposals to the IETF, and they are taken seriously, until they are either adopted or die due to lack of interest.
This particular proposal has expired and ...
- 98.7k
28
votes
What is the practical use of a /31 CIDR or 255.255.255.254?
A /31 network actually has two usable hosts for a point-to-point link. See the Standards Track RFC 3021, Using 31-Bit Prefixes on IPv4 Point-to-Point Links (published in December 2000):
Abstract
With ...
- 98.7k
25
votes
Accepted
acknowledgment by TCP does not guarantee that the data has been delivered
This part of the RFC is about passing responsibility over to the operating system or whatever is the next stage of the process. It's fundamentally concerned with the separation of layers.
An ...
- 16.2k
20
votes
Where can I use the IPv6 documentation prefix
The IPv6 documentation prefix (2001:db8:::/32) must be used ONLY for documentation purposes. It means written examples, diagrams, PPT presentations, Textbook explanations, etc.
This range shouldn't ...
- 4,497
19
votes
Accepted
Why are there 3 ranges of private IPv4 addresses?
Back when the RFC for private addressing was proposed, classful addressing was still common. The reasons for the three address ranges are found in RFC 1918, Address Allocation for Private Internets:
...
- 98.7k
19
votes
Accepted
IPv4 Segment 100.64.0.0/10
The 100.64.0.0/10 address block is not private address space; it is shared address space. This is spelled out in RFC 6598, IANA-Reserved IPv4 Prefix for Shared Address Space (I highlighted the ...
- 98.7k
19
votes
Is "IPv10" a joke or a serious RFC draft?
Is “IPv10” a joke or a serious RFC draft?
Both. That draft doesn't solve a single problem but opens a can of new ones. I guess that bloke is serious and he doesn't get what ridiculous schemes he's ...
- 82.7k
14
votes
Usage of Flow label in IPv6 header?
The above answer isn't really correct. The flow label isn't designed for packet ordering - IP does not care about order, it is an unreliable services whose only goal is delivery on layer3.
Better way ...
- 141
11
votes
Accepted
Where can I use the IPv6 documentation prefix
If your test environment is separated from your local network you hypothetically could use any IPv6 addresses which are not reserved for special uses. However, if you are looking for an equivalent of ...
- 375
10
votes
Accepted
What is the proper name for hexadecimal like standard notation of an IPv6 address?
RFC 5952 gives you the canonical IPv6 format. That is explained in the RFC itself:
This document defines a canonical textual representation format.
and
4. A Recommendation for IPv6 Text ...
- 98.7k
10
votes
Accepted
Should a router use SLAAC for IPv6 address assignment?
In RFC 7084, it also states:
W-1: When the router is attached to the WAN interface link, it MUST
act as an IPv6 host for the purposes of stateless [RFC4862] or
stateful [RFC3315] interface address ...
- 9,421
10
votes
acknowledgment by TCP does not guarantee that the data has been delivered
From the RFC perspective, the "end user" is the application. There's no guarantee that the application got the data, just that the TCP process received it.
From your NOC perspective, the network is ...
- 67.1k
10
votes
Accepted
Where are 0 TCP/UDP ports banned?
IANA has reserved both TCP and UDP port 0. See the IANA Service Name and Transport Protocol Port Number Registry. IANA is the Internet Assigned Numbers Authority, so all internet numbers, including ...
- 98.7k
9
votes
Accepted
Why isn't 10.0.0.0/8 used instead of 192.168.0.0/16 for private addresses?
It is merely a necessity constraint and personal preference.
If a Network is being built that would only have 10, or 20, or 50, or even 100 hosts, there is no reason not to use a /24 from 192.168.0....
- 15k
9
votes
Where are 0 TCP/UDP ports banned?
TL;DR: RFC870
Port zero has been included in the "Network Wide Standard Functions" range since RFC433 in 1972, but has never been assigned.
https://www.rfc-editor.org/rfc/rfc433.html
Here ...
- 191
8
votes
IPv4 Segment 100.64.0.0/10
That block of addresses is reserved for service providers to be able to do NAT in such a way that it doesn't conflict with the normal private address space. If you start using it as private space then ...
- 6,720
8
votes
IPv4 Segment 100.64.0.0/10
Officially RFC 6598 says
Devices MUST be capable of performing address translation when
identical Shared Address Space ranges are used on two different
interfaces.
Most NAT ...
- 13.2k
8
votes
Where can I use the IPv6 documentation prefix
Just from the RFC I can't see anything defining that documentation is
strictly written text. Do you have any source for this interpretation?
According to the IANA IPv6 Special-Purpose Address ...
- 98.7k
8
votes
Accepted
What MAC address do I use to generate a IPv6 Pseudo-Random Global ID
Remember, the purpose of the algorithm is to avoid everyone picking FD00::/48 so they can abbreviate everything with the double colon. (Or other "easy" ones like FDAA:AAAA::/48, etc).
The ...
- 15k
8
votes
Accepted
Class A most significant bits '0' as in RFC1166 or older or '00' as suggested in RFC4632?
It appears to be a typo in that RFC. Notice that the header of the RFC says Errata Exist. It is not uncommon for things like that to happen.
That particular error is corrected in the errata. See the ...
- 98.7k
7
votes
Should a router use SLAAC for IPv6 address assignment?
RFC 4862 really describes routers within a single administrative control. RFC 7084 clarifies how customer routers should behave. This gives an ISP some freedom in how it supports IPv6 to its customers....
- 98.7k
7
votes
Is Per Vlan Spanning Tree or RPVST an open standard or can it only be implemented by Cisco?
(R)PVST(+) is a proprietary standard defined by Cisco (or a set thereof). However, there are many other vendors and devices supporting it - you may need to check the specifications of your devices.
...
- 82.7k
6
votes
Should a router use SLAAC for IPv6 address assignment?
Why does RFC 4862 say "Since host autoconfiguration uses information advertised by routers, routers will need to be configured by some other means."
The people who wrote that document (and it's ...
- 13.2k
5
votes
How do the Telnet requests "DO" and "WILL" differ?
What is the difference between the WILL and DO request?
There is a very important concept involved here, that you need to understand when implementing a Telnet server or client, otherwise your ...
- 151
5
votes
Why are there 3 ranges of private IPv4 addresses?
While not an great answer (Ron Maupin's is more accurate), I was always taught to always use the the smallest class that left 10% room for expansion. This was "very important" with a facility that had ...
- 151
5
votes
Accepted
How do ICMP packets travel in a networks?
It is indeed specified in RFC 792, on the top of page 2:
Message Formats
ICMP messages are sent using the basic IP header.
You will also found in this RFC :
ICMP, uses the basic support of IP as ...
- 19.5k
5
votes
Accepted
Suggestion for Weights for Weighted Round Robin
14 egress queues seems a bit excessive - most devices I dealt with use 3, 4 (most common), or up to 8 queues. I'd just use four which simplifies things:
critical traffic (very low-bandwidth, critical ...
- 82.7k
5
votes
Accepted
Why do we need private IP address range?
RFC 1918 provides address ranges that you can safely use within a private network without any danger that these same addresses might be used on the public Internet.
Any node within your network needs ...
- 82.7k
Only top scored, non community-wiki answers of a minimum length are eligible