Questions tagged [ipv6]

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

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Is there a simple way to get IPv6 vs IPv4 traffic statistics using netstat on macOS? [closed]

After a change of ISP, I've recently gotten IPv6 access, so I thought I'd play around a little with netstat to see if it's possible to get some kind of high-level per-protocol statistics (on macOS ...
gmw's user avatar
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Is NAT66 really not used when there are all these apps exposed by public load balancers?

I am imagining a Kubernetes IPv6 based cluster with Nodes in a private subnet and an Ingress deployed that sets up an application load balancer in a public subnet which receives a public IPv6. You can ...
flipcc's user avatar
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Juniper and EdgeCore dhcpv6-relay remote-id (option 37)

I have the following problem. I have minimal configuration of dhcpv6-relay agent on QFX5100. Before the QFX, there is an Edgecore switch on which DHCPv6 snooping is enabled. The problem occurs as soon ...
Libor's user avatar
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iputils ping: -N (IPv6 node info query): purpose, usage, examples

What is the purpose of IPv6 node info query and how is used in ping-N ...?
pevik's user avatar
  • 137
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Clarification of relation between IPv6 and TCP [duplicate]

I thought IPv6 and TCP could be used independently, but IP does not need TCP at all, whereas TCP usually needs IP to function. Is my understanding correct? Does IPv6 need TCP to function? Looking at ...
Niklas Rosencrantz's user avatar
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1 answer
55 views

Why will specifying the outgoing physical interface work for a static route with IPv4 and not for IPv6?

When setting up loopback interfaces with IPv6 addresses with static routes between two directly connected routers through their interfaces. It does not work to specify it with the outgoing physical ...
Calvin Broadus's user avatar
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1 answer
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How is DHCP6 suppose to work with dynamic prefixes?

Let's consider a simple tree topology. There is an ISP router, there is my router / DHCP6 server (which will update a DNS zone) and some other downstream routers. According to RIPE690 it is advised ...
Radu Marinescu's user avatar
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How to do IPv6 Subnetting (from left to right) outside nibble boundaries with LAN sizes [duplicate]

Well, up to this point I'm a bit confused of how to do IPv6 Subnetting outside nibble boundaries with specific hosts numbers. Lets say that i have a /64, and that i want to divide it in 3 subnets, 2 ...
MastergGM's user avatar
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1 answer
141 views

How to remote access CCTV's device behind CGNAT for IPv4, and device doesn't have support for DDNS IPv6? [closed]

TL;DR Multiple locations with local CCTV. How to remote access all of them, with an ISP that services IPv4 behind CGNAT and the DVR doesn't supports DDNS for IPv6. DVR also offers API, SDK, P2P and ...
Justcurious's user avatar
1 vote
2 answers
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Why is EUI-48 to EUI-64 conversion deprecated, and yet it's used in IPv6?

The IEEE Guidelines for Use of Extended Unique Identifier (EUI), Organizationally Unique Identifier (OUI), and Company ID (CID) [PDF] have a section titled, "Mapping an EUI-48 to an EUI-64". ...
dsedivec's user avatar
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What is hiearchy of IP addresses? [duplicate]

What is structure/hiearchy of IP addresses? I mean, is mandatory that IP address e.g. 216.9.10.0 is subnet of 216.9.0.0? Of course many times that is the case and IMO it would be logical, but I have ...
worner's user avatar
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1 answer
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Should (IPv6) multicast subscribers send report to query?

I am waking through RFC3810 and playing with MLDv2. From that RFC I thought when anyone send query for group :: (all groups) and send it to address ff02::1 all subscribers on segment should send its ...
FoxVK's user avatar
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4 votes
2 answers
647 views

must an IPv6 router have an IP address in the SLAAC prefixes it's advertising?

for example: i have a router with the lladdr fe80::1/64 on interface e0. the router is configured to advertise the autonomous, on-link prefix 2001:db8:1:1::/64 in RAs on e0. must the router have an ...
unixwitch's user avatar
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Get all reachable IP addresses within a private network [closed]

Is there a way to get all reachable IP addresses within a private network. I know that we can get all active devices' IP addresses within same subnet using arp. I was wondering if something similar ...
Atharwa Adawdakar's user avatar
1 vote
1 answer
118 views

ipv6 - SLAAC - proper handling of RA in case of already existing prefix

I have a device which, apart from SLAAC, can also get an IPv6 address (IP) on interface by manual configuration. How the device should behave, when it gets a RA packet with prefix equal to the IP's ...
user10099's user avatar
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MTU for WireGuard over IPv6

What would be the optional MTU for a virtual WireGuard link transmitting over IPv6 to avoid unnecessary fragmentation? Here is how I approached the calculation: [IPv6 Header] - 40 bytes [Some IPv6 ...
Moss Richardson's user avatar
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1 answer
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IPv6 subnetting with different end device requirements

`I have three main buildings with building A with 242 end devices, building B with 54 end devices and building C with 894 device. And all the routers are connected to each other like ring topology. ...
Anjil Khadka's user avatar
2 votes
2 answers
240 views

Can link-local address be used by DHCPv6 Relay

So I will start that I read this previous post here: Can link local addresses be used for transit networks without breaking routability? But it's not fully registering in my brain I guess if this ...
Ippy's user avatar
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6 votes
2 answers
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Is there any reason to use unique local IPv6 addreses in a production network?

The title pretty much explains everyrthing. Since there is a huge amount of IPv6 addresess, couldn't every device just use a global unicast address? What is the practical use of unique local IPv6 ...
Mitrixsen's user avatar
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4 votes
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Is possible to use DHCPv6 without SLAAC?

Hello may (legally) occur situation when router is not sending router advertisements but is providing configuration via DHCPv6?
FoxVK's user avatar
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1 answer
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Can, and should, a link local address be used for a gateway in IPv4? [closed]

I was just experimenting with IPv6 and hypervisors, where I made productive use of the IPv6 link local address to route packets towards a tap device to establish communication with a virtual machine. ...
fdr's user avatar
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1 vote
1 answer
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For IPv6, How much processing delay difference between using /64 and /127 for Core network interconnection?

I've question about IPv6 routing processing delay. Lets assume we've got big Core network with huge traffic and many hops. All router's p2p interconnection addresses are used /127 network. In my ...
Ulteara's user avatar
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2 answers
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Huawei Cloudengine 6851 ipv6 acl not matching

I have a Huawei 6851 and this is my config acl ipv6 number 3006 description MY-IPv6 rule 10 permit ipv6 source 2001:x:x:x::x:x/112 rule 20 deny ipv6 destination 2001:x:x:x::x:y/128 rule 30 permit ipv6 ...
Blackmetal's user avatar
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2 answers
122 views

Customized IPv6 packet with multiple inner data fragments for multiple destinations

I am studying the possibilities of using IPv6 potentialities to design a customized IPv6 data packet that has the following features: 1. Combines many fragments of different data in one packet. For ...
Lee's user avatar
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1 vote
1 answer
755 views

The use of a link local IPv6 address

In a networking course that I'm following, there was a mention of several ways of how IPv6 link local addresses can be used, such as Assigning the link local address of a router/L3 switch as the ...
Mitrixsen's user avatar
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1 vote
1 answer
239 views

OSPFv3 Convergence Issue between OPNSense & Cisco Router

I have been digging around the internet and have been trying to get IPv6 up and running on my lab. Here is my current layout: I have been trying to get OPNSense and the Cisco 1900 router to give each ...
Joshua.Simpson's user avatar
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1 answer
86 views

I am trying to wrap my head around NDP

I know before PC10 can ping PC11 it will use IPv6 Neighbor Discovery to resolve the Destination MAC address for layer 2 header. But what would the DEST MAC ADDR be and what topics can I learn this
s3lectstar's user avatar
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How to correctly setup a DHCP server in the following network?

So, I've got the following Network Configuration: Assume that, on the graph, "PCs" can be any device that needs an IP(apart from a router). Now, as explained on my title, I want to run a ...
Costas M's user avatar
1 vote
0 answers
70 views

A new pattern of IPv6 addresses in mobile network [closed]

When I checked the IPv6 addresses in a mobile network from the log, I found a strange IPv6 IID configuration pattern. As shown below, the common part of the IID of IPv6 addresses is :1:0:. 2401:4900:...
dianwoshishi's user avatar
0 votes
1 answer
165 views

Many SYN_RECV connections in netstat [closed]

When I do netstat -tn, I consistently see a lot of connections from a few ipv6 addresses (the fe80:: ones; usually around or exactly 4096 of them). I'm unable to find the addresses on WHOIS, and ...
Simon Fredsted's user avatar
5 votes
2 answers
727 views

Can a jumbogram (giant data packet) be used at a large scale (in WAN for example)?

There are many scientific paper for Jumbo frame, even more, some real implementations and deployments. But it is not the case for Jumbogram !! Jumbo frame (geant frame) for Layer 2; Jumbogram (geant ...
Lee's user avatar
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17 votes
5 answers
5k views

Why do we need ports with IPv6?

My understanding is there are 2^32 - 1 possible IPv4 addresses, and 2^16 - 1 possible ports. Which gives ~2^48 addresses. The additional 2^16 additional ports seem almost insignificant considering the ...
Josh's user avatar
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1 answer
105 views

IPv6-over-IEEE802.15.4 Multicast scope

An IPv6 Multicast address is defined as | 8 | 4 | 4 | 112 bits | +--------+----+----+-------------------------------------+ |11111111|flgs|scop| group ID ...
Eduardo Rodrigues's user avatar
1 vote
2 answers
753 views

IPv6 subnets without delegated prefix

I have received an IPv6 network from my provider, say it's 2001:db8:1::/48. I did not get delegated prefix from them. I would like to use the IPv6 addresses on different networks behind a firewall (...
TomS's user avatar
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0 answers
16 views

What is the maximum safe UDP payload size over IPv6? [duplicate]

I am developing a networking library (that uses exclusively UDP) and I want to support both IPv4 and IPv6 by using a dual-mode socket. I want to limit the size of the packet user can send to a value ...
FICHEKK's user avatar
  • 101
3 votes
1 answer
261 views

Does Network Discovery (rfc2461) preclude ARP sniffing?

I'm debugging a system demonstrating intermittent loss of connection. It's loosing entries from the neighborhood cache while there are active connections. Does Neighbor Discovery (rfc2461) require ...
david's user avatar
  • 133
0 votes
2 answers
96 views

Simple IPv6 Global Unicast question

I was reading this article which states: RFC 3587 states that out of the 128 bits in IPv6 addresses, left most three bits are must be fixed as 001. Remaining 45 bits are reserved for global routing ...
questioner's user avatar
0 votes
2 answers
447 views

Will there be an easy way to identify local Ipv6 addresses like with Ipv4?

When using WireShark, WNetWatcher, or any packet analysis tool, it's very easy "at a glance" to identify packets that are originating from the local network versus the Internet, since their ...
user4779's user avatar
  • 115
1 vote
1 answer
864 views

Understand DSCP and Precedence Values in Ipv4 or Ipv6 packet

I read from this website to understand DSCP and it's corresponding IP precedence value. For example DSCP value is '000 000' which Drop Probability is N/A(never happen) and it's Equivalent IP ...
S. M.'s user avatar
  • 398
0 votes
1 answer
56 views

Does socket address include transport protocol (http://)? [closed]

Let's say I have the following: http://ip_addr:port This is supposedly called the socket address (see sources below), but I can't find a conclusive answer anywhere if the transport protocol (http://) ...
Intrastellar Explorer's user avatar
1 vote
0 answers
91 views

How do I set up IPv6 multicast over an MPLS carrier?

I'm setting up an MPLS carrier with VPNs in GNS3, using Cisco 7200 routers. Exact version I'm using is C7200-ADVIPSERVICESK9-M Version 15.2(4)S5, but I'm willing to upgrade/change if that's needed. On ...
Thomas's user avatar
  • 121
2 votes
1 answer
100 views

Which ranges of IPv6 and IPv4 do requests to the local network and the host?

I'm looking for the range of IP address that is bound to the local network or the host itself. So far for IPv4 I found: 10.0.0.0 - 10.255.255.255 172.16.0.0 - 172.31.255.255 192.168.0.0 - 192.168.255....
Jimmy's user avatar
  • 23
0 votes
2 answers
77 views

IPv6 Subnetworks Explanation

Can somebody help me get a better understanding of IPv6? For me, v4 is considerably easier to wrap your head around. Some questions I still have after a few hours of reading: Maybe the simplest one: ...
HardReset's user avatar
1 vote
1 answer
93 views

What "IVI" from "IVI Translation" stands for?

In several documents in the context of IPv4/IPv6 transition I see these three letters "IVI" that seems to be an acronym, but I was unable to find what it means or suppose to refer. Maybe is ...
Diego Queiroz's user avatar
2 votes
1 answer
228 views

Is an ICMPv6 neighbor advertisement meaningful if no options are set?

This is what I think a normal ICMPv6 neighbor advertisement should look like: It says "I'm 2001:57a:d000::54 and you can reach me at 02:02:53:85:21:25". This is what neighbor advertisements ...
9072997's user avatar
  • 123
1 vote
2 answers
189 views

How does all 54bits after FE80/10 should be set to 0 apply?

I read on a website: " link local addresses use the address block of Fe80::/10 (from FE80:: to FE80:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF). However, the standard states that the 54 bits after FE80/...
Mouad's user avatar
  • 45
6 votes
1 answer
763 views

IPv6 prefix interpretation

I have a very basic question about IPv6 prefix. Taking a very simple example about prefix notation: "2001:db8:abcd:0012::0/64" My question is: Do we call the whole thing under quote as ...
Network_starter's user avatar
3 votes
1 answer
762 views

IPv6 neighbour discovery blocked by MLD snooping switch

I recently noticed that my IPv6 multicast traffic was being broadcasted to all hosts connected to a switch, even those that had not subscribed to the traffic. To fix this, I enabled MLD snooping on ...
Malvineous's user avatar
1 vote
1 answer
86 views

OSPFv3 Authentication IPSEC SPI/Logging issues - Can you filter out logs?

I'm running into a problem with our Cisco ASR-1002HX and ASR-1006X. I have a mix of Juniper and Cisco routers all configured exclusively with IPv6. All of our routers are in the same ospfv3 area 0. We ...
Ben's user avatar
  • 157
2 votes
2 answers
764 views

IPv6 link-local address

Can somebody explain why we can assign link-local address FE80::1 to both interfaces? What does it give to me ? R1(config)# interface g0/0 R1(config-if)# ipv6 address fe80::1 link-local R1(config-if)# ...
Wojciech's user avatar

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