Questions tagged [ndp]
For questions about NDP, where Neighbor Discovery Protocol (NDP) is a part of the Internet Protocol suite used with IPv6.
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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
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Is DHCP in the application layer or the network layer?
Tanenbaum's Computer Networks says:
5.6 THE NETWORK LAYER IN THE INTERNET
...
5.6.4 Internet Control Protocols
In addition to IP, which is used for data transfer, the Internet has
several companion ...
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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 ...
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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 ...
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Why solicited-node multicast address while all-node multicast address can do the same thing?
Why bother plugging in the last 24 bits of the sender's unicast address into the solicited-node multicast address while all-node multicast address can achieve the same thing? In my view, this move is ...
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Why do IP(v6) routes require a next hop IP(v6) address and not just a MAC Address?
My understanding of how you "ask" a router to route a packet for you is that you simply put the IP(v6) address of the destination host and the MAC address of the router you are routing via ...
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Why does a Cisco router advertise a prefix with NDP RA when it has an address in that range?
If I write
interface Vlan1
... {ipv4 config} ...
ipv6 address 2001:DB8:5432:101::/64 eui-64
ipv6 address FDAA:DB8:5432:101::/64 eui-64
ipv6 enable
ipv6 nd prefix 2001:DB8:5432:101::/64
ipv6 nd ...
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Why does IPv6 NS not use unicast address but multicast
This is a follow up of Why not put unicast address in IPv6 packet containing NDP neighbor solicitation instead of solicited-node multicast address?
The accepted answer makes no sense.
It states the ...
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What are usecases for IPv6 link-scope anycast?
IPv6 Neighbor Advertisement messages have a flag called Override, see RFC4861. It toggles, whether the receiver of the message should remove other link-layer addresses for the same IPv6 target address ...
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When is the source address of ICMPv6 message types 133, 135 and 136 other than unspecified(::/128) or link-local(fe80::/10)?
According to rfc4861 the source address for Router Solicitation(ICMPv6 type 133), Neighbor Solicitation(ICMPv6 type 135) and Neighbor Advertisement(ICMPv6 type 136) can be an address assigned to the ...
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Why not put unicast address in IPv6 packet containing NDP neighbor solicitation instead of solicited-node multicast address?
This is a follow-up question to Why is the NDP Neighbor Solicitation message sent to the solicited-node address?.
Summary: say I would send an IPv6 packet and put the unicast address of the host I ...
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How data travel from a node to a destination IP address? [duplicate]
Let's say I have a lot of devices which connect to a single switch, and the switch itself connects to a router which provide Internet connection.
Whenever an application on a node needs to ...
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Can a Neighbor Advertisement response packet trigger the transition from STALE to DELAY?
I think the title is pretty descriptive.
I cannot seem to find anything in the standard about what kind of packets could trigger the transition from the state STALE to the state DELAY, in the ...
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Remote Host Neighbor Cache Entry State after Neighbor Solicitation request
When a Host A sends for the first time a NS request to another Host B, host B answers with a NA.
In Host A Neighbor Cache, the state Entry for host B gets from INCOMPLETE to REACHABLE, when NA comes ...
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OSI layer of Neighbor Discovery Protocol
NDP operates using ICMPv6 and, even though ICMPv6 messages are encapsulated in payload field of IPv6 datagram, ICMPv6 and ICMP are usually considered as network layer protocols. At least, on Wikipedia ...
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Global Unicast in IPv6 Neighbor Discovery
I have a very small pcap file in which Neighbor Discovery is performed for Global Unicast Addresses.
That is, IPv6 addresses of both neighbors as I can see in Wireshark start from 2001:. Both IPv6 ...
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Link Local Address using in NDP (IPv6)
How is using of link local address in NDP. We can discover neighbor by using global address. So why we need link local address in NDP?
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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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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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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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IPv6 - RA prefixes and flags
I'm trying to understand how SLAAC works, but having troubles understanding how the information inside the Router Advertisement is used by a client.
Let's say neither the Manager nor the Other ...
- 133
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Why is the NDP Neighbor Solicitation message sent to the solicited-node address?
As I understand it, when Host Alice knows Host Bob's IPv6 address but not its MAC, Alice sends an NDP Neighbor Solicitation (NS) message to the solicited-node multicast address for Bob.
Alice knows ...
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Broadcasts in IPv6
I'm aware of the fact that broadcast has been removed from IPv6 and just has multicast instead. However, recently I read
"This process (ARP) is now achieved via a multicast address called the ...
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