Questions tagged [ipv6]

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

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3
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4answers
9k views

When it comes to Computer Networks, what is a logical address and physical address?

I understand the concept of logical address, and physical address when it comes to computer memory. That is, physical is the actual address and logical address is what the applications think the ...
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4answers
1k views

Possible (bit) patterns of a netmask

Given a prefix Y, it's easy to calculate the corresponding netmask: Put Y times a set bit, and then fill up "to the right" with zeros until one has 32 bits (IPv4) in total. Example: Prefix 24, thus ...
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1answer
73 views

Would multiple RIPng processes improve convergence times and stability and larger RIP deployments

You could label this a theoretical question but I consider it a design question. Is is possible to have a large RipNG deployment using multiple RINng instances and simulate OSPF like areas? Thanks
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2answers
13k views

Why don't we use MAC address instead of IP for having “Internet” or doing communication? [duplicate]

We know MAC address is unique in each devices.So why can't we just send/receive data using MAC address only?
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2answers
2k views

Converting IPv6 to Dotted Decimal Notation [closed]

Does anyone have a simple way to convert IPv6 addresses to dotted decimal notation? I am currently using a pretty ugly python script which: Converts the IPv6 address to exploded form Splits every ...
1
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1answer
961 views

DNS64/NAT64 WiFi hotspot using Windows [closed]

Is there a way to have this option proposed by Apple available in Windows? I want to test connecting an IPv6-only client to an IPv4-only server on a local environment.
1
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1answer
80 views

How to get the IPv6 [closed]

I'm in a network that provides both IPv4 and IPv6 for the nodes, and i have the IPv4 of a machine. How can I find the IPv6 assigned for this machine?
3
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2answers
155 views

Switching to public IPv6

I'm considering the possibility of moving my public addresses to IPv6 for several web applications and sites that I host. When inquiring with my ISP, the account exec replied to me with the following ...
6
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2answers
4k views

NEWBIE: How can two computers communicate if they are behind firewalls?

This is something I have wondered for awhile and couldn't find answer of. Apologies for the stupid question, but here it goes: If two computers have static IP's then they can easily send each other ...
1
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1answer
50 views

What is the command line to inspect the IPv6 discovery cache?

I can't seem to find a command for this, only configuration commands are listed in the documentation and show ipv6 nd destination does not work on my system This is on Cisco vIOS 15.2 Edit: ...
10
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4answers
1k views

Migration from IPv4 to IPv6 strategies

As everyone is aware we are out of IPv4 addresses and soon (if not already) we shall be moving on to IPv6. What are some good strategies and practices to migrate a complete IPv4 network onto IPv6?
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1answer
1k views

What happened to IPv5?

I hear/read much about IPv4 and IPv6 and nothing about IPv5. Where did it get lost in the discussion?
4
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1answer
744 views

Dual stack OSPF redistribution in MP-BGP

My topology is working perfectly fine and is as follows: CE1 <-> PE1 <-> P1 <-> P2 <-> PE2 <-> CE2 CE1 <-> PE1 and CE2 <-> PE2 are having OSPFv3 with ...
1
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1answer
255 views

Proper way to use IPv6 address range

I have the following IPv6 addresses range, with netmask 64 : A:B:C:D:E:0000:0000:0000 -> A:B:C:D:E:0000:0000:FFFF I have to assign some of them to virtual machines. Should I use A:B:C:D:E:0000:0000:...
1
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1answer
68 views

IPv6 address abbreviateion

Given IPv6 address 2001:0000:0000:0000:1111:0000:0000:0000, should it be abbreviated as: 2001::1111:0:0:0 or 2001:0:0:0:1111::? It seems I didn't see any specification talking about it.
2
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1answer
75 views

IPsec tunnel with IPv6 and security gateways

Silvia Hagen wrote in one of her books (ISBN:9783952294222, page 463) the following (free translation from german): Tunneling, an essential element of IPsec [...], is problematic for existing ...
1
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1answer
223 views

How much influence does multicast and IPv6 have on latency?

I am looking for a fast and a diverse library for my game engine network. I have searched for a while, and I decided to use a simple one because of being fast to understand. I saw there are better ...
2
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1answer
190 views

How to verify whether two devices can communicate

In IPv4, we had to find the Network Address using the IP address and the subnet mask. With IPv6 there's already the Network Prefix in the IP address. Suppose I have an IP address A: 2001:db8:a0b:12f0::...
4
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1answer
2k views

MAC address can be used to generate an IPv6 link local address

MAC address can be used to generate an IPv6 link local address. What is the process of using MAC address to derive an IPv6 address ? What are the problems that can be caused due to process of using ...
2
votes
2answers
1k views

Man In The Middle on IPv6, are IPv4 packets affected?

If I successfully Man in the Middle attack an IPv6 Address of my victim can I also sniff its IPv4 packets? Attacks like Neighbor Advertisement Spoofing or Last Hop Router?
5
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2answers
206 views

Locating a single IPv6 or IPv4 routable prefix at multiple data centers

Academic question (at the moment): Is it possible to advertise BGP routes to a given prefix (IPv6 and/or IPv4) from multiple different physical data centers? I guess this is multi-homing, but ...
2
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1answer
81 views

Is IPv6 Routing Header useless?

RFC2460 doesn't describe any types other than Type 0. And in RFC5095, it deprecated Type 0 Routing Header. Does that mean Routing Header is useless?
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1answer
115 views

What does the Flow mean?

Above image explains how to communicate between IPv4 and IPv6 by tunneling.. I understand that concept by wrapping IPv6 datagram into iPv4 datagram.. But I do not understand what the 'Flow X' in the ...
3
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1answer
495 views

IPv6 6to4 mechanism

I'm not sure if I get the idea of 6to4 mechanism. The way I see it: if we have two IP v6 hosts that would like to communicate and all of the internet was IP v6, there would be no problem. However, ...
4
votes
1answer
605 views

TCAM entry width

if IPv4 is 32 bits and IPv6 is 128 bits wide, why TCAM is configured to be 36, 72, or 144 bits wide? why don't configure it as 32, 64, and 128 bits? if there is link for reading material would be ...
16
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5answers
2k views

How to choose a BGP router ID when using IPv6 only?

Usually, when using BGP, you can choose (or your device chooses four you) a router ID from one of your assigned public IP addresses. Now, let's admit you only run IPv6. As the router ID is still a 32 ...
4
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4answers
9k views

Why there are no different classes of network in IPv6?

In IPv4 we have class A, class B, and class C. In IPv6 we have only global prefix and Interface ID. I know there are plenty of addresses in IPv6 but it gives room for too many host addresses.And when ...
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2answers
779 views

NAT translation of a packet on interface with IPv4 address to interface with IPv6 address and vice versa

I have two interfaces on my linux machine, lets say eth0 and eth1. eth0 is a public IP that has IPv6 address and eth1 has a private IPv4 address. If I try to nat the packets that received on eth1 ...
2
votes
1answer
379 views

Why is only 24 bits of the MAC address used for multicasting?

When doing neighbor discovery in IPv6, the last 24 bits of the hosts MAC address is glued on to some link local multicast prefix. I'm wondering why 24 bits? Why not 48, or 32, or 16? What happens if ...
2
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1answer
87 views

Mobile Node home address and Mobile Node Home Agent Address

I have been reading mobile IPv6 for a while and in that the two terms: Mobile Node's Home address and Mobile Node's Home agent address are used frequently, and they seem similar to me. My ...
3
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5answers
269 views

Since we ran out of IPv4 now, what does it mean for consumers?

I'm trying to understand what it means for users... Does it mean that some content will not load on websites, increasingly so in the upcoming year or so? Does it mean that certain CDNs or hostings ...
2
votes
1answer
70 views

The length of Fragment header in IPv6

From RFC2460 :https://tools.ietf.org/html/rfc2460#section-4.5, the length of the fragment header seems to be fixed 8 bytes. But when I test with Scapy with the default fragment header, from sniffer ...
2
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1answer
90 views

Parse the Encapsulating Security Payload

RFC2460 defines some extension headers, like hop-by-hop, Routing Options...etc. All these headers seem to have the next header type and header extension length in the beginning of the header. However ...
14
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6answers
1k views

Time to switch to IPv6?

I am thinking of upgrading our networking situation and am considering a migration of IPv4 to IPv6. Is it too soon to be considering this move as it looks like much of the networking gear and OSen ...
1
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0answers
59 views

IPv6 network addresses with 6to4 router and tunnel [closed]

I'm currently studying for an upcomming exam and I came across the following question, the IP-Addresses are to be filled in by me and this is my try at solving it, but I'm not sure if the IP-Address, ...
0
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1answer
49 views

Can there be any extension header before Neighbor Solicitation Payload

The IPv6 payload may like the following: IPv6 Header -> ExtHeader -> ... -> UpperLayer Header I use Scapy to make a packet such that: IPv6 -> Hop-by-Hop-Option -> Neighbor Solicitation [1] However ...
12
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5answers
5k views

What IPv6 prefixes should never be routed?

Seems clear to me that the Link Local, and Unique Local, addresses should at least be filtered. Is there anything other than LLA/ULA that should be filtered? For LLA, is it standard practice to ...
1
vote
2answers
260 views

How will ISP's handle the future of IPv6 to pro-sumers [closed]

With IPv4, ISP's rarely, if ever, assigned a static IP to a consumer except for maybe AT&T and a few local carriers unless you registered as a business account with them. I understand with the ...
4
votes
1answer
855 views

Why do some AAAA records behave strangely on existing A records?

I noticed the following odd behavior with AAAA records when querying existing A records. By base domains I mean domain names without subdomains. So when an A record exist and an AAAA record does not ...
1
vote
3answers
623 views

Is it ok if multiple non-router devices send IPv6 RAs with same prefix in the same network?

We engineer embedded systems (electronics & software), running our own OS with LWIP (a network stack). The device is configured to be IPv6 only (means: no IPv4 is available). These embedded ...
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0answers
221 views

Subnet delegated prefix on SRX

I configured a Juniper SRX firewall to receive IPv6 prefix from upstream router: family inet6 { dhcpv6-client { client-type statefull; client-ia-...
10
votes
1answer
518 views

Dynamic Crypto Map with IPv6 access list

I am trying to configure a dynamic crypto map for use on a pure IPv6 network, on Cisco 15.2M. The problem is when I try to add an ipv6 access list to the dynamic crypto map, I get an error message. ...
4
votes
0answers
431 views

IPv6 link-local addresses for virtual interfaces are identical - how to assign “link-unique”? [closed]

I have a VPN connecting two virtual interfaces of two hosts. Both VPN interfaces have MAC addresses 00:00:00:00:00:00, as the OS (Linux) assigns link-local IPv6 address based on MAC address. So the ...
1
vote
1answer
144 views

Will an asa pass traffic that matches a crypto map entry if Phase 2 is not completed?

I have two ASAs that have publicly routable ipv6 addresses, and a /56 at each site. Since we're going to be rolling out ipv6 internally at some point for all users, I'd really like to prevent packets ...
2
votes
1answer
799 views

Will home networks migrate to ipv6? [closed]

So I have a rudimentary understanding of working with basic networking tools, things like using nmap to scan ports and find IP addresses on internal networks, and ssh for connecting to various devices....
3
votes
1answer
1k views

How to calculate the Subnet address?

I have an ipv6 address FC00::50, and the subnet mask length is 64. How to calculate an subnet address? I want address FC00::50 in the scope of this calculated subnet address. Here is the description: ...
5
votes
2answers
12k views

How to understand the IPv6 route table [closed]

Here is the ip -6 route result of my working OpenWRT system. I find that this is quite different to the route table of ipv4. default from :: via fe80::3e8a:b0ff:fe86:f870 dev eth0.2 proto ...
3
votes
2answers
917 views

EX4200 / EX3300 IPv6 Routing Question

we have about 5 Servers and currently only a cheap L2 Switch. We got an /42 IPv6 Network assigned from our provider and want to route this /42 Network into multiple /64 subnets. These can just be ...
4
votes
2answers
134 views

IPv6 addresses allocation

I need to allocate IPv6 /48 block from one provider to another, located in different country. Is it possible at all? I don't own this block but let's assume that current provider will agree to "...
3
votes
1answer
3k views

can pfsense perform ipv6 nat (for outbound service redirection)

I have to keep prefacing my question with "I am not trying to reimplement ipv4 nat inbound for outdated security I don't understand correctly". Hi! I am wondering if it is possible to implement an ...

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