Questions tagged [ndp]

The Neighbor Discovery Protocol (NDP, ND) is a protocol in the Internet protocol suite used with Internet Protocol Version 6 (IPv6) responsible for locating hosts and routers on a link.

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IPv6 NDP spoofing prevention on Linux

I am unable to filter Neighbor Advertisement packets based on a target address field, which is known as a 'tgt' field in this type of packets. A message when some device with a MAC aa:bb:cc:dd:ee:ff ...
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Using global unicast address as source for neighbor solicitation messages

Why do neighbor solicitation messages only use the link local address as source? What would be the advantages and disadvantages of using the global unicast address instead?
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IPv6 with DHCP6: where does the default route come from?

My ISP provides native IPv6 with DHCP6-PD; my router is a Netgear router running OpenWrt. Everything works fine, but I want to understand how exactly, because there are no RAs whatsoever from the ISP'...
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Proxmox KVM IPv6 Routed not working

I got a /48 v6 assigned by my Provider with a dedicated server, on which I did install Proxmox 5. My Issue is, that the dhcpdv6 should assign the VM a fixed ip, but it does not get the IP assigned. I ...
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1answer
273 views

How can IPv6 clients find servers such as NTP, SIP

For IPv6, I understand clients may get an address either statelessly using SLAAC, or statefully using DHCPv6 (although I hear Android doesn't support address assignment via DHCPv6). My question is, ...
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1answer
393 views

IPv6 on Linux tun/tap: NDP not working

I am working on an old code that used to connect different IPv6 devices over a different kind of network (a powe line netwrok, PLC, which is quite similar to 802.15.4). To do that, it created Linux ...
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154 views

Proxy NDP, intermittent Address Unreach

I've configured NDP proxying on my Digital Ocean droplet to allow containers to obtain public IPv6 addresses. It seems to work, but occasionally I'll get Destination Unreachable (Address Unreachable) ...
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1answer
1k views

IPv6 Connectivity within Docker on a Vultr host with ndppd

I found another answer and looked through the official Docker ipv6 docs, but I'm still having trouble with IPv6 and Docker. If I expose public ports on Docker containers, I can connect to them via ...
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Linux not sending NDP for routed packets

I have configured IPv6 networking on three machines A, B, C (B and C are LXD containers running on A). B and C are directly connected only to A. I've assigned addresses fdef:9062:4cf7:5::2/64 and fdef:...
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994 views

IPv6 interface not responding to neighbor solicitations, DHCP involved too

ip addr shows: 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 02:6d:5e:86:29:49 brd ff:ff:ff:ff:ff:ff inet X.X.X.X/...
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1answer
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IPv6: I'm confused about addresses [closed]

I'm starting studying IPv6 and I'm having some troubles understanding some aspects. Let's clarify if I'm getting this right! A single host may have: - a unicast global address - a link local address ...
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1answer
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Debian Wheezy doesn't answer to ICMPv6 neighbor solicitations

Hello, there. I manage some Wheezy servers with IPv6 enabled on all of them. They all have a global IPv6 /64 block using the first address in the block as the primary, i.e.: root@Host /h/david# ...
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1answer
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ipv6 : why ndp resolves to global scope address?

I'm facing a strange ipv6 behavior and I don't know how to solve it because I'm not familiar with ipv6. Maybe this behavior is normal. I hope that you will help me. ( I'm running under debian 6.0.9 ...
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1answer
633 views

NDP + DHCPv6 (DNS) how to?

How to combine, get prefix ipv6 through the NDP and getting dns through dhcpv6? example: interface FastEthernet1/0 no ip address duplex auto speed auto ipv6 address 2000::/64 eui-64 ipv6 nd ...
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3answers
11k views

IPv6 hosts configure default route with router's link-local address

I have recently added IPv6 to our network as per the instructions at http://www.chronos-tachyon.net/reference/debian-ipv6-and-hurricane-electric. However, the hosts on the network automatically ...
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1answer
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How to enable Ipv6 on my ubunutu 11.04 virtual machine

I have installed 3 VM's on my PC.(Ubuntu 11.04).I want to setup an IPV6 network to review and test some of the IPV6 tools like NDPMonitor.(monitors ICMP messages of Neighbour Discovery Protocol.) IP ...
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1answer
745 views

IPv6 routing setup (using native IPv6)

I administrate the network for a small organisation. Having only experience with IPv4, I'm unsure of how to best approach IPv6. Existing IPv4 setup We have 13 public IPv4 addresses which are all NAT'...
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7answers
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Why use DHCPv6 over Stateless Address Autoconfiguration?

IPv6 and RFC 2462 provide a means for hosts to configure their own IP addresses via stateless address autoconfiguration. To me this seems like the bee's knees, and it leaves me wondering why someone ...
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2answers
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Linux tool for IPv6 unsolicited neighbor advertisements

Unsolicited neighbor advertisements is necessary to facilitate rapid service address takeover in a HA cluster. For IPv4 (ARP) you can use "arping -U", but so far I've had no luck finding any tool that ...
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3answers
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How do you display the IPv6 NDISC cache in Linux?

Suppose you've configured IPv6 proxy NDP on one of your Linux systems like so: ip -6 neighbor add proxy 2001:db8:1234::5 dev eth1 How do you verify that the configuration took? ip -6 neighbor show ...