Questions tagged [ipv6]

For questions about Internet Protocol version 6 (IPv6); as specified in RFC 8200.

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1answer
147 views

Can't connect between an IPV6 network and an added IPV4 router

I have a very simple topology, where 4 routers use IPV6 and RIP, there aren't problems and all devices have connectivity. The issue is if I add another router this time using IPV4 for clients. I ...
13
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3answers
1k views

Where can I use the IPv6 documentation prefix

We are currently building a networking course with a practical part where students have to configure a small network in a virtual environment. However, we are not sure what ipv6 prefixes we can use ...
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2answers
100 views

Is it possible to see a Teredo IPv6 address in IPv6 neighbor cache?

Is it possible to see a Teredo address (from 2001::/32 block) in an IPv6 neighbor cache? For example, in the case of Junos, in the output of show ipv6 neighbors. As much as I tested, this is not ...
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1answer
37 views

Is it possible that IPv6 multicast address is shown in the “IPv6 Address” column of the “show ipv6 neighbors” command in Junos?

Is it possible that IPv6 multicast address(i.e address from ff00::/8 address block) is shown in the "IPv6 Address" column of the "show ipv6 neighbors" command in Junos?
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2answers
4k views

IPSec in IPv4 and IPv6

I'm getting a little confused in understanding the differences in IPSec in IPv4 and IPv6... Are the principles of IPsec the same in v6, but instead of it being optional it is now mandatory for it to ...
91
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12answers
29k views

IPv6 address space layout best practices

I'm comfortable with IPv4 address space allocations. By which I mean: Given services to plan for, or an organization to network, I have a good grasp of how to plan IP address space usage. (or at least,...
10
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1answer
2k views

Does IP provide QoS or not?

IP provides a best-effort delivery service. I believe this implies, among other things, that it offers no QoS to the users. However, IP has a byte in its headers (ToS in v4 and Trafic Class in v6) ...
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2answers
3k views

How to check if switch is ipv6 fully compatible

We will move to IPv6 in the next months and I have a lot of switches and routers and I want to discard IPv6 non-compatible or not fully compatible devices. What kind of standar I will need to check ...
2
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3answers
10k views

Access Server ipv6 from a ipv4 only network

One of my Server is sitting behind a network which is only accessible trough a IPV6 (no double stack IPv4/IPV6 available). How can I access the server (SSH, HTTP, other protocols) from an network ...
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1answer
104 views

Trade Floor Network Design Feedback [closed]

I have an assignment that I am working on. Now I admit, I am far from knowledgeable and I have nowhere to turn to for help at the moment. I am not asking for someone to complete the assignment for me, ...
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0answers
176 views

How is the source link-layer address in IPv6 router solicitation(RS) messages used?

When I analyze the router solicitation(RS) messages, then they contain the MAC address of the sending host. How does the router use this MAC address seen in ICMPv6 message? Does it simply use it as a ...
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2answers
215 views

How does WAN work?

I understand the basics. WAN is a network that connects multiple LANs together. Usually the router is the connection between the LAN and WAN. But I have some questions books and the internet could not ...
5
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2answers
378 views

Will a default-deny rule on incoming connections of an IPv6 firewall negate any advantages that were gained by not having NAT?

Will a default-deny rule on incoming connections of an IPv6 firewall negate any advantages that were gained by not having NAT? In other words, one of the most talked about advantages to IPv6 is that ...
2
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2answers
386 views

If the IPv6 address will be strictly based on EUI-64 logic then is there any real need of Neighbour Discovery Protocol?

I am building my fundamentals on IPv6 and have realised the multicast group is nothing but FF02::1:FFXX:XXXX. Here xxx is nothing but 24-bits of Mac-address (48 bits) with simple 7th bit magic. ...
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1answer
1k views

What are the key advantages and disadvantages of NDP compared to ARP?

So why they didn't use ARP in IPv6? is there any real benefit of doing this? what are the key advantages and disadvantages of using NDP instead of ARP? (In overall network performance, Security and ...
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1answer
125 views

Implications of ipv6 on LAN security [duplicate]

I'm not sure whether this is really the correct place to post this question, because it's not really about a "professional" setting. However, I have the standard setup with computers behind a netgear ...
4
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1answer
533 views

IPv6 - ULAs - Am I understanding use correctly?

Tinkering more with IPv6 and trying to unlearn the IPv4 stuff. Assume my router is correctly respecting the reserved addresses. LLIPs aren't going to pass through to the router's outside interface ...
72
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5answers
30k views

Is “IPv10” a joke or a serious RFC draft?

Internet Protocol version 10 (IPv10) Specification The name is funny (IPv4 + IPv6 == IPv10), but the actual proposal looks strange (one more packet format to battle incompatibility between packet ...
7
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1answer
1k views

Why is an IPv6 Link-Local Address a /10?

I'm currently studying for my CompTIA Network+ Exam and am a bit confused as to why the IPv6 link-local address is a /10 and not a /12 or /16. Since each character in an IPv6 address is 4-bits and ...
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1answer
96 views

ISATAP configuration not working when adding hosts

I am trying to make an ISATAP configuration where two ipv6 hosts connected to dual stacked routers can communicate to each other. I have the following configuration: I have configured RIP across ...
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3answers
4k views

IPv6 NAT with Link-Local Address

It's more than usual to find NAT translating IPv4 private addresses (such as 192.168.0.0/16 or 10.0.0.0/8) to non private addresses. Is it possible that NAT translates even IPv6 link-local addresses (...
39
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5answers
7k views

Why does ipv6 specify 128 bit address, when there are only 48 bits in MAC addresses?

So, I'm reading for a networking exam, and I'm just wondering if I have missed something basic. Is there a need for more ip addresses than MAC addresses, and how would a node with one network adapter ...
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2answers
47 views

When neigbour solicitation and router solicitation are used to get the IPv6 address, then what is the role of 0:0:0:0:0:0:0:0/128?

I am learning computer networks, but getting confused each time I proceed my analysis. Kindly help. Thanks in advance!
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1answer
105 views

Sending image files using GNS3

I had built a network using GNS3, this network contains a lot of routers, the problem is: I want to send an image file between these routers using GNS3 is there any way to do that?
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1answer
1k views

Network flooded with ICMPv6 Multicast Listener Report Packets

I recently noticed that 3 out of 4 Unifi APs kept reaching 100% CPU usage. When I jumped onto the networks and took a Wireshark capture I noticed 1000s of these packets being sent in just a matter of ...
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2answers
231 views

Is Path MTU Discovery(PMTUD) really efficient?

As i know, PMTUD uses ICMPv6 to find minimum MTU value in the network path. I understood why IPv6 doesn't allow fragmentation (by reading this article), but PMTUD doesn't look like good manner. here ...
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1answer
327 views

What is the purpose of “Process name” in RIP for IPv6 on Cisco Routers

I was going through Cisco documentation to configure RIP for IPv6. One of the steps says Enables the specified IPv6 RIP routing process on an interface. But they do not go into detail about this ...
43
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4answers
45k views

Why is fe80::/10 reserved for link local addresses when fe80::/64 is actually used?

I understand that IPv6 reserves the fe80::/10 prefix for link local addresses, and that hosts select an address with a /64 prefix. Why is the reserved space so much larger than what is actually used ...
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2answers
2k views

no default-router option in dhcpv6?

I'm learning how to program a Cisco router with dhcpv6 and i saw that they never configure the default gateway address in the dhcpv6 configuration . Then how can the pc know what it's gateway address ...
1
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1answer
123 views

IPv6 VPNs source address selection

Say I have the following IPv6 prefix assigned to me by my ISP : 2a01:1000:1000::/48 with 2a01:1000:1000::1/48 assigned to my VPN server. I set up a VPN with a /64 from that block to assign to my ...
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2answers
98 views

Internet Protocol versioning - IPv4 and IPv6 [duplicate]

I know that IPv6 is the successor of IPv4. But I don't understand versioning policy. Why not IPv5? Did IPv1, IPv2, and IPv3 exist?
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2answers
440 views

What provision does DS-Lite, as used by ISPs, have to provide IPv4 blocks to CPE?

I run a small ISP for a rural community in England. There are around 350 residential properties and 15 small businesses. Three of these businesses run systems that require two consecutive IPv4 ...
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1answer
5k views

ipv6 number of Host Address

I'm trying to find the number of host addresses of IPv6, I know the correct answer is 18.4 × 1018 I cannot seem to correctly calculate the formula to reach the correct answer, please help me. IPv6 = ...
1
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1answer
373 views

Enabling Multicast Listener Discovery (MLD)

Do standard NICs that support IPv6 have the ability to perform MLD? Essentially I understand MLD, but am struggling to find if it needs to be configured or if it is enabled by default on a host. Just ...
14
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5answers
10k views

Duplicate IP Address - which one wins?

If there's a duplicate IP address, which one "wins"? First, last, flaps, neither?
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3answers
140 views

How would I make a client find a server with an unknown IPv6 Address?

Let me first explain my situation: I am currently in the process of trying to build a solution for managing multiple Internet of Things devices on a network. It should be possible to automatically ...
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1answer
59 views

Design thinking of Solicitation node address in IPv6

Recently I study RFC 4291, and the solicitation node address is defined in that spec. I know what and the function of this solicitation node address. But just wondering why does the address design as ...
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1answer
851 views

How does address resolution work with multicast, specifically IPv6?

If I want to send an IPv6 UDP multicast message, how does L3 to L2 address resolution occur? I think I understand ARP and how this same idea applies to unicast, but I am struggling to grasp the idea ...
4
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2answers
1k views

Why are IPv6 addresses so long?

By convention, each device on the LAN under IPv6 gets a /64 subnet, right? That's an obscene number of addresses per device! Why not make the addresses shorter, say, 72 bits, then each device would ...
4
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1answer
958 views

IPv4 vs IPv6 performance

What are the differences in performance for IPv4 and IPv6? Is there much of a difference in speed? and what are some of the methods that could be used to test this?
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1answer
223 views

Checking split horizon status with IPv6

In a frame relay multipoint topology where the routers are running RIP, we know that RIP by default keeps split horizon on with IPv6 and we go into the RIP process an use no ip-split horizon to ...
1
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1answer
542 views

Max hosts of subnet IPv6

When a interface takes an IPv6 address it does the DAD mechanism. A NS will be sent to the multicast address "solicited node multicast group address". If there is another interface in this multicast ...
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1answer
151 views

How can IPv6 host know default router's IPv6 address using RA?

I know an IPv6 host will send Router Solicitation (RS) messages, and a router on the link will reply Router Advertisement (RA) messages. In the RA message, there is the Source Link-Layer Address and ...
2
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3answers
5k views

IPv6 addressing (slash notation)

I've recently been studying the fundamentals on IPv6, but there are some things that I don't quite understand about how the addressing is structured. I know that link local addresses start with FE80, ...
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2answers
2k views

IPv6 and online privacy and security

I am studying up on IPv6 and part of the talk was about how the machines generate or can have multiple IPv6 addresses for internal use and external use. Does this mean that there is no longer a "...
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1answer
284 views

VRRP VRID configuration for IPv6

Can we use same VRID (VRRP instance) for both IPv4 and IPv6 virtual router in VRRP or VRRP-E? In a layer-3 router, we have requirement to configure interface VE with both IPv4 and IPv6 gateways with ...
3
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1answer
438 views

Finding Subnet Ranges of IPv6

I need to find a single subnet range to cover 10,000 IP addresses (hosts), given the IPv6 Address 2405:1300:c5c1:322::/108 (for example) I am aware of how to do subnet in IPv4 but cannot grasp the ...
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4answers
172 views

IS-IS IPv6 over IPv4

In IS-IS the router knows the interfaces addresses of the other routers. So would it be possible to connect two IPv6 areas over an IPv4 area? A router in area A knows that the destination ipv6 ...
4
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2answers
5k views

IPv6 ULA vs Link-Local

Could some one kindly explain what is the difference between IPv6 Unique Local Addressing and Link-Local addressing? I understand that Link-Local is for within a network, but isn't Unique Local ...
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1answer
2k views

Calculate networking bits for IPv6

I can get the networking bits for IPv4 addresses like 17 for 255.255.128.0. Similarly, how should I calculate it for IPv6 addresses? Say, if I have a subnet mask of ffff:ffff:ffff:ffff:0:0:0:0 or ...

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