Questions tagged [ipv6]

IPv6 is the successor to IPv4. Rather than 2^32 addresses (like IPv4), it has 2^128, which is 340,282,366,920,938,463,463,374,607,431,768,211,456 unique addresses (34 undecillion). IPv6 addressing is quite different to IPv4 and is not backwards compatible, but protocols that sit on top (HTTP, SSH, etc) remain unchanged.

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terminate ipsec transport at firewall?

I am exploring using ipsec transport mode to provide secure ipv6 access between 2 LANs and several remote users. I love the combo of a flat ipv6 global unicast address space combined with ipv6 ...
goertzenator's user avatar
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Windows server trying to use IPv6 despite being turned off

I have a server which needs to communicate with another server (both win 2k8r2). One of them recently had an IP address change, and I suspect that the IPv6 address that the AD DNS server holds is now ...
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Is it normal for ip -6 route to accumulate entries in Linux?

On a Linux machine connected to the ipv6 internet via a router's radvd-advertised tunnel, ip -6 route accumulates recent addresses. Why does this happen? Is it expected behavior, or is the machine ...
joeforker's user avatar
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Why is connecting to a web server listening on an IPv6 link-local address unreliable / How is IPv6 neighbor discovery expected to work?

I've got the following setup: My Windows 7 development box (or a freshly installed Windows 7 VM) A Windows Embedded CE 6.0 based device with IPv6 enabled and a web server running A USB RNDIS ...
Kai Ruhnau's user avatar
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IPv6 stateless autoconfiguration not working on CentOS 6.2

I have a problem setting up IPv6 connectivity to two virtual hosts that I run on VmWare workstation. The hosts are CentOS 6.2 x86 and x86-64. Even though they are on a bridged network and there is a ...
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3 answers
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Pros and cons IPV6 vs stretched vlans

I'm having a hard time finding information about whether implementing ipv6 or using a stretched vlan is a better option for geographically dispersed sites is better. Does anyone know: Problems with ...
Jim B's user avatar
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Windows Server 2003 RDP not listening on IPv6

i have a Windows Server 2003 machine; with IPv6 enabled: Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : newland.local IP Address. . . . . . . . . . . . : 192.168.1....
Ian Boyd's user avatar
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How to configure something like "Reflexive ACL" on OpenBSD?

My U-Verse modem has something called "Reflexive ACL" described as Reflexive ACL: When IPv6 is enabled, you can enable Reflexive Access Control Lists to deny inbound IPv6 traffic unless this ...
Earlz's user avatar
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How does 6rd (IPv6 Rapid Deployment) route over the public internet?

First 6to4: 6to4 allows IPv6 Packets to be transmitted over IPv4. It's used to connect two IPv6 'islands' - not enable IPv4 to talk to IPv6 or vice versa. IPv6 address 2002:AABB:CCDD:: becomes IPv4 ...
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Win2k8R2 Obtaining DHCPv6 address, but has static configuration

I have a Windows 2008R2 server on a dual-stack network. IPv4 is working fine (statically assigned) but the IPv6 stack is misbehaving; I have configured it with a static IPv6 address (::bbbb:150 below)...
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Internet Explorer and IPv6

I can't seem to stop the IPv6 address being registered by our server. Does anyone know how? This is causing slow browsing issues when browsing to spiceworks server using Internet Explorer. The ...
resolver101's user avatar
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How ISPs will assign IPs /subnets for end users in IPv6

Consider two scenarios: The end user has a simple computer, dual-stack The end user has a LAN behind a dual-stack router How will ISPs differentiate each one of these kind of users in IPv6? An ...
Filipe Rodrigues's user avatar
2 votes
2 answers
219 views

Is it possible to have Novell NCP on top of IPv6?

Is it possible to configure NetWare Core Protocol to run over IPv6?
Muxecoid's user avatar
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Neighbour table overflow on Linux hosts related to bridging and ipv6

Note: I already have a workaround for this problem (as described below) so this is only a "want-to-know" question. I have a productive setup with around 50 hosts including blades running xen 4 and ...
tim's user avatar
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IPv4 is almost out in Asia-Pacific, what are people doing about it? [closed]

Asians and those in North America are going to be separated on the internet if ISPs / telecoms don't do something. European progress to IPv6 is taking place much faster than in North America. What ...
unixman83's user avatar
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Managed Ethernet switch per-port MAC address translation?

Just a shot in the dark here, but I thought I'd ask in case anyone has some ideas: I've got a testing scenario where some (GUI-less/embedded) IPv6 devices are going to be temporarily plugged into the ...
Jeremy Friesner's user avatar
4 votes
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1k views

configuring IPsec with IPV6

I am working with racoon tool and ipsec-tools and I have been able to connect two devices with IPSEC working in transport mode. However, I did it with IPv4 addresses and when I change them to IPV6 ...
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2 votes
1 answer
971 views

IPV6 Bind/DNS DHCP

We are run the one event in that there 7000 people are visiting, with Laptop to provide then internet access. We thought of setting up IPV6 DNS/DHCP all this people will be use LAN cable to get ...
neolix's user avatar
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VMware ESX 5.0 blocking DHCPv6 solicitations in vSwitches?

We have a network on which we're setting up a test IPv6 deployment. Here's the layout: Win2008R2 DHCP VM and Debian Squeeze radvd VM -> vSphere 5.0 vSwitch -(Trunk)-> Catalyst 2960G -(Trunk)-> ...
bab's user avatar
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How do I set up a basic IPv6 video stream using VLC

I'm teaching a class IPv6 and would like to create a lab for them to see the true benefit of ipv6 multicasting in action. I created a multicast address for myself ff15::1 (where ff is multicast, 1 ...
sparkyspider's user avatar
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0 answers
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Attempting to DNS resolve / relay an IPv6 address for a host

I have a network switch doing IPv6 DNS relay to a Linux box (3.0.4-gentoo #7). The packets (DNS request) are arriving fine at the Linux box. Where I'm stuck now is how to resolve those, either by ...
Mark Mayo's user avatar
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2 votes
2 answers
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Lowest IPv6 host address in an address range

What is the lowest IPv6 host address in an address range; is it A:B:C:D:E:F:0:0/64 or A:B:C:D:E:F:0:1/64? Does IPv6 have a network address (0 = "this") like IPv4? I know one address type is depricated ...
nlovric's user avatar
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IPv6 ULA not working like I want

I'm trying to get IPv6 working for a big school project. I have a Dualstack line with an IPv6 ready modem. The server and client get there IPv6 automatically, but when I want to use static ULA ...
Jonathan's user avatar
1 vote
2 answers
2k views

how to "connect ipv6 client to ipv4 only server"

I have a linux server that supports only ipv4 and an IPv6 client. How should I use tunneling or NAT to get the connectivity done from ipv6 client to the ipv4 server? Client is a softphone that sends ...
priyanaka's user avatar
5 votes
2 answers
155 views

Is it possible to run pre-Lion OS X in an IPv6-only environment without static configuration? [closed]

Is it possible to run pre-Lion OS X in an IPv6-only environment without static configuration? From what I've been able to figure out, OS X 10.6.x will acquire an address via SLAAC, but it doesn't ...
larsks's user avatar
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How do IPv4 only applications work on IPv6 only hosts?

Is there any way for IPv6-unaware applications to continue to work on a host with only IPv6 connectivity? The IPv4 implementation of the host could know about the problem and just encapsulate the ...
lxgr's user avatar
  • 570
3 votes
1 answer
218 views

What is the motivation for DNS64?

I'm wondering why NAT64 needs something like DNS64 at all. Couldn't an IPv6-only host, when trying to reach an IPv4-only host, just embed the IPv4 address of the target host in an IPv6 packet (by ...
lxgr's user avatar
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12 votes
5 answers
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Managing parallel rules for ipv4 and ipv6 iptables?

We've recently started experimenting with IPv6, and one of the first issues we're having to contend with is dealing with a completely separate set of firewall (Linux iptables/ip6ables) rules for the ...
larsks's user avatar
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Advantages of IPv4 over IPv6

In theory, how IPv4 is better than IPv6? I need only advantages of IPv4 for study purposes. In another words - what are the pros of IPv4?
Cleankod's user avatar
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2 answers
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Name resolution in an IPv6 network without a DNS server

Background: I have a network with Windows and Linux machines The router doesn't support IPv6, but the computers have link-local addresses (fe80::/10), and I plan to buy an IPv6-capable router in the ...
imgx64's user avatar
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2 votes
3 answers
1k views

Debian: IPv6-in-IPv4 over OpenVPN

Following (roughly) the instructions https://www.zagbot.com/openvpn_ipv6_tunnel.html at I now have the following: Client martin@theoria:~$ ifconfig eth0 Link encap:Ethernet HWaddr 00:50:8d:b3:...
Martin Eve's user avatar
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2 answers
431 views

FreeBSD 9.0 supports only IPv6. What this practically means?

I have very scarce knowledge of IPv6 but I'm considering installing FreeBSD on an RDC device which acts as a server to my home network running services. The last release states that one of the changes ...
atmosx's user avatar
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1 vote
1 answer
595 views

IPv6 MTU and MSS ignored in LAN?

I have a server with a (sixxs) IPv6 tunnel and a local network behind it. The tunnel has MTU of 1470, and a prefix with this MTU is advertised by radvd, and picked up by the local client: root@host:~#...
Michel's user avatar
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3 votes
1 answer
35k views

Can't ping using IPv6 address

My network setup is very simple: two win7-64 machines connected to a switch. IPv6 enabled for their network interface. No router no outside network no DHCP. ipconfig report for the computer shows ...
galbarm's user avatar
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13 votes
2 answers
4k views

IPv6 without nat but what about an isp change?

I haven't worked with IPv6 outside of 4to6 tunneling on my home pc with stuff like GoGoNet. I've read about how it works in a general way. No NAT required (or suggested) and each client uses a public ...
Halfdone's user avatar
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0 votes
1 answer
639 views

IPv6 only subdomain

I have a domain and shared hosting at godaddy. I've created a subdomain and added an ipv6 proxy from sixy.ch in my aaaa records. Nov I have IPv4 a v6 connectivity too, but i want to block access from ...
Lahon Zeravosch's user avatar
1 vote
1 answer
2k views

ipv6 port redirect? (for mirroring the host's ip4)

Is it possible to do some port redirection on linux for IPv6 alongside the IPv4 redirection? The point is to make all the various services — that are running on separate hosts / virtual systems — ...
HoverHell's user avatar
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16 votes
7 answers
15k views

How can I make my web server reachable via IPv6 on the AWS platform?

My business's web site uses the AWS platform. I want the site's visitors to be able to reach my content using the IPv6 protocol. How can I add an IPv6 address?
Jeff Loughridge's user avatar
1 vote
1 answer
1k views

dante-server not working with ipv6

I always get Error = 0x08 (Address type not supported) when I try to open ipv6 addresses like ipv6.google.com via my dante-server. How do I get danted to work with ipv6?
Horst Bratschowski's user avatar
2 votes
1 answer
7k views

Disable inet6 link-local address from one interface

Anyone know how I can disable the link-local address from just one interface on CentOS 5.6? This is what I tried: root-> egrep -i ipv6 /etc/sysconfig/network-scripts/ifcfg-eth0 IPV6INIT=no ...
salparadise's user avatar
1 vote
1 answer
2k views

ipv6 max_addresses in sysctl.conf (Debian 6)

I'd like to assign any number of IPv6 addresses to a Debian 6 host, but I see the following setting, and want to know what are the consquences of setting higher, or does this setting approach limits ...
mpbloch's user avatar
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13 votes
3 answers
2k views

What are the IPV6 reserved address spaces?

I'm converting my good old IPV4 based iptables firewall script and would like to substitute the CLASS A/B/C/D/E reserved address spaces to the ones found in IPV6. My goal is to deny any packets that ...
Jauzsika's user avatar
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2 votes
1 answer
1k views

DHCP v6 Option for Circuit ID

DHCP v4 has Circuit ID option(82:1) for defining the actual interface ID of the Client. What is the equivalent option in DHCPv6?
Sivakumar's user avatar
4 votes
1 answer
857 views

Subnet Masking in IPv6

I know within IPv4 subnet masking, the network is determined by either the 1st, 2nd or 3rd set of octets. Being there are so many more characters in IPv6, how do you determine the subnet mask?
Christopher Chipps's user avatar
4 votes
1 answer
2k views

Renting a IPv4 address block [closed]

I am building a lab network with about 10 virtual routers and 20 host machines (also virtualized) as a part of a school project. The aim is to demonstrate a wide range of IPv6 routing, deployment and ...
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0 votes
1 answer
460 views

Communication problems on secondary interface tap0

I am using UDP over ipv6 as communication stack. I have network client running on secondary virtual interface tap0. It generates messages for server which is supposed to run on the same interface but ...
Amit S's user avatar
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4 votes
3 answers
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IPv6: Can one use more than 64 bits for the network ID

Wikipedia states: Unicast and anycast addresses are typically composed of two logical parts: a 64-bit network prefix used for routing, and a 64-bit interface identifier used to identify a host's ...
yas4891's user avatar
  • 195
2 votes
2 answers
743 views

Linux does not get IPv6 default gateway from Cisco ASA5510 on autoconf

My ASA 5510 has the following configuration for an interface. My Ubuntu box (2.6.35) connected to this network will correctly autoconf an IPv6 address, but it will not set a default route. interface ...
Bittrance's user avatar
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1 vote
3 answers
16k views

Can I figure out if my server has IPv4 or IPv6 from a CLI?

Is there any method (via CLI) of knowing if the server I'm at has IPv4 or IPv6? EDIT: As for the reason why I'm asking this question (apologies if I wasn't specific enough), I'm referring to this ...
Henrik's user avatar
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1 vote
1 answer
5k views

net.ipv6.conf.all.forwarding = 1 is an unknown key

I have few system with ipv6 addresses. I want to forward request from one system to another. hence I kept the option net.ipv6.conf.all.forwarding = 1 in sysctl.conf but the request is not getting ...
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