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Questions tagged [dhcpv6]

DHCPv6 is similar to classic DHCP as known and very common for IPv4. Since IPv6 features stateless auto configuration (SLAAC), DHCPv6 is less widespread than DHCP for IPv4.

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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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1answer
65 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
38 views

Is there a DHCPv6 equivalent of DHCPv4's private-use options?

DHCPv4 allows for custom information to be provided to network devices, using "private-use" options. The IANA registry of DHCP parameters reserves option numbers 224 to 254 for private use. Does ...
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1answer
276 views

How do I enable IPv6 on Fedora 28 on Amazon EC2

I can't seem to get IPv6 working in Fedora 28 in Amazon EC2 (so using cloud-init and DHCPv6). It works in RHEL 7 with the configuration described here. Applying the same configuration to Fedora 28 ...
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1answer
942 views

Why is a /128 IPv6 address assigned via DHCPv6 in Ubuntu?

I am testing the implementation of IPv6 in Ubuntu. My Ubuntu linux client correctly gets RA from server and configures an address in the advertised prefix. Next it gets another address via DHCP which ...
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559 views

Debian: Get single IPv6 over DHCP with Prefix Delegation

I've a Debian 9 server with multiple network interfaces acting as web server connected to an ISP-provided optical network terminal (ONT) @ 1Gbps. The ISP provides us with multiple dynamic IPv4 ...
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103 views

serving multiple networks with one single DHCPv6 server

I have an ISC DHCPv6 server running on a debian (Stretch) machine and 3 physical networks : net1, net2 & net3 . The router is a Debian machine running the Zebra routing software (See picture below)...
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194 views

How to get /64 as prefix length when using DHCPv6 and radvd?

For our networking course we were asked to set up a DHCPv6 server in a virtual machine. I choose to work on a virtual machine(on VMware) running Ubuntu Desktop 16.04 and Lubuntu 14.04 as test client ...
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1answer
450 views

Linux DHCPv6 server for PD on ppp interfaces

I need to configure prefix delegation on PPPoE. What is the best DHCPv6 server implementation for this? So far I checked the following: isc-dhcp-server - doesn't work with PPP interfaces dibbler - ...
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65 views

Why i can't get a IPv6 address from a relay network

My dhcp server using isc dhcpd v4.3.6,dhcpd6.conf file: subnet6 2001:xx:xxx:xxx::/64 { range6 2001:xx:xxx:xxx::10 2001:xx:xxx:xxx::ffff; option dhcp6.name-servers 2001:...
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1answer
84 views

Is it common for DHCPv6 and RA to provide IPv6 addr in the same subnet?

For IPv6, both DHCP and RA (the "prefix information" option, with the A flag) can provide IPv6 addresses to hosts. I'm still confused if it's common for DHCPv6 and RA to provide IP addresses in the ...
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553 views

Issues with adding and using IPv6 “Predefined Options” on Windows Server 2012r2 DHCP

The Windows Server DHCP Service has the ability to add predefined options for IPv4 and IPv6 by right clicking on the protocol and selecting "Set Predefined Options" On IPv4 they work in just the same ...
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2answers
2k views

Windows Server 2016 IPv6 Hell

We have a small network consisting of a Sonicwall, Windows Server 2016 DC, and Exchange Server 2016 (hosted on a second WS2016 machine) along with a number of Windows 10 clients. Due to compatibility ...
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1answer
28 views

Unnamed devices in server 2012 dhcpv6

I have a server 2012 R2 box running DHCP for IP v4 and v6. In reviewing the leases for the IP6, there are a set that do not have names. These have a DUID type of 04 as shown in this picture: IPv6 ...
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1answer
49 views

ipv6: low level technical explanation of Stateless address autoconfiguration

I have a clear understanding of broadcast, DHCP and general network configuration for ipv4. I'm looking for a low level technical explanation of network configuration for ipv6. Some of the terms that ...
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307 views

How to disable rapid-commit option on DHCPv6 client (systemd-networkd and dhcpcd)

I tried IPv6 support in Amazon EC2 VPC. Amazon EC2 VPC uses RA and DHCPv6 for IPv6 addressing. Problem AFAIK, a EC2 instance receives an RA message with manged flag, then it sends a DHCPv6 solicit ...
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2answers
2k views

IPv6 on Amazon VPC: missing default route in Ubuntu

Now that Amazon has extended IPv6 support for VPC to most of their global regions including eu-west-1, I'm trying to get my instances connected. Unfortunately I can't get routing to work. I've ...
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1answer
581 views

How to set up IPv6 with Prefix Delegation (PD) on a Cisco ASA?

Our business internet provider recently enabled IPv6 for our fiber connection. They assigned us a /48 to use. Great, I can finally move away from using our 6in4 tunnel. Or not?... They want us to use ...
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1answer
230 views

rfc 6939 support for dhcpv6 relay

isc-dhcp-server now supports rfc6939 as of version 4.3, and I would like to be able use it as it is quite nice to be able to just use the mac address to identify dhcpv6 clients. However, I can't seem ...
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1answer
598 views

Can clients learn their time zone on a network configured using RA?

I found that there are some clients which when they are on an IPv4 network learn their current time zone through DHCP option number 101. On an IPv6-only network where an IP prefix is advertised by ...
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2answers
658 views

DHCPv6 not working when UFW is enabled (Ubuntu 16.04 LTS)

So, as the title says, I setup a isc-dhcp-server for DHCPv6, which is working as long as UFW is disabled. Once enabled, though I have all the necessary rules in place, and UFW is enabled for v6, it ...
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1answer
157 views

DHCPv6 CONFIRM message in Linux

I'm testing DHCPv6 client. One of the tasks I need to check is if the CONFIRM message is sent as described in RFC (if it occurs in specified timeout). I know that this message is sent to be sure if it ...
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0answers
875 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
118 views

Manually Assigning Site Local IPv6 Multicast Address to DHCP Server

According to https://en.wikipedia.org/wiki/IPv6_address#Multicast_addresses, ff05::1:3 is a site local multicast address for All-dhcp-servers. Based on this, when I add the DHCP role to a Windows ...
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1answer
557 views

Fixed Size of IPv6 SLAAC

My confusion with IPv6 SLAAC is that the router provides the network prefix, and the host generates its own part using EUI-64, which means it is always going to be a 64-bit address. Now, SLAAC is ...
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0answers
645 views

Windows Server 2012 Local DHCPv6 Stateful & Public Stateless?

I want my LAN to have static IPv6 ULAs from the server's DHCP6, and global IPv6 as well. So it'd look something like this: Server IPv6 Address. . . . . . . . . . . : 2601::1 (public auto) ...
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1answer
5k views

Enable DHCPv6 in dnsmasq to distribute fixed range IPv6 addresses but failed

Help wanted! I want to create a AP in my Raspbian PI. And i choose dnsmasq as the dhcpv4 and dhcpv6 server. However, my laptop can acquire IPv4 successfully but fail to get a IPv6. Why the dnsmasq ...
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0answers
1k views

IPv6 only server PXE provisioning

We are currently preparing for IPv6 only network deployment and struggle to find a unique server identification. In our previous setup, we used mac address as servers primary identification. We were ...
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3answers
6k views

Debian 8 resolv.conf overwritten by IPv6 autoconfiguration/DHCP when DHCP disabled

I have recently installed Debian 8 on a network with IPv6 DHCP Enabled. /etc/resolv.conf is being overwritten by the IPv6 DHCP entires continually despite the fact that all IPv6 DHCP is disabled, ...
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0answers
255 views

More Than One Static Address Binding for DHCP?

I have my DHCP server setup to be connected to three subnets (ie: 2001:abab:1234:1:: or 2001:abab:1234:2::) using three unique IP addresses, except in DHCP server binding properties I can only see one ...
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399 views

Windows Server 2012R2 DHCP Scope Preference

I have three scopes setup in DHCP. Subnets 0, 1, and 2; setup with the preference of 1, 2, and 3 respectively. Yet when I tell a client to renew its address it gets an address from subnet 1. What is ...
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1answer
3k views

Disable DHCPv6 client in Windows

I don't quite understand the link between 4 parameters related to IPv6 stateful and stateless autoconfiguration used under netsh int ipv6 set interface command context in Windows: advertise ...
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1answer
923 views

Why are ipv6 dhcp leases also given also to static interfaces?

I'm playing with Windows 2012 DHCP server for IPv6. As with IPv4, the client network interfaces can be configured to either obtain an IPv6 address automatically, or use a statically configured address....
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1answer
2k views

dhcpv6-client Open For Firewalld On Cent-OS 7

Hi I have checked and unable to find an answer to this already posted. I have reinstalled Cent-OS 7 on a dedicated server. It uses a template that OVH have (they are the provider of the server) for ...
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2answers
2k views

Server 2012 Obtaining DHCPv6 Address, but has static configuration

This is very similar to the problem I had with 2008R2 (Win2k8R2 Obtaining DHCPv6 address, but has static configuration), but that solution doesn't work with 2012R2. The box is a new 2012R2 domain ...