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, ...

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Custom IPv6 stateless autoconfiguration suffix [duplicate]

When a router announces an IPv6 prefix via Router Advertisements, a host can use SLAAC to automatically derive the remaining bits from its MAC and use the combination as its globally routable IPv6 ...
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0answers
16 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 ...
2
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1answer
145 views

IPv6: No NAT / Local Addressing + ISP Offline

I've been reading some articles about IPv6 and I'm currently playing with some addresses on a VPS. Recently I was thinking on a typical home/office IPv4 network. We're used to have a local DHCP ...
3
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1answer
441 views

IPv6 Not Routing Properly

I am setting up a RRAS machine for my personal use and for use by a few of my friends. I am currently using Windows Server 2012; but I have tried this with Windows Server 2008 R2. Both systems ...
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1answer
27 views

Bind9: Master->Slave Notify IPv6 with fallback to IPv4

I've a small Master->Slave DNS scheme setup between two machines running Debian 8 + Bind9 in dual IP stack. The master and the slave both own an IPv4 and IPv6 used by bind, enfored by the ...
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1answer
188 views

IPv6 Client Service

I got a Windows Server 2012 which provides DHCPv4 and DHCPv6. The NIC on the Server got 2 IPv6 addresses. I found out that the second IPv6 comes from the "IPv6 Client Service" which (only the ...
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0answers
27 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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2answers
55 views

Apache 2.2 won't start with an ipv6 address [on hold]

I'm trying to only allow the localhost on a certain folder, it works perfect with ipv4 (Allow from 127.0.0.1) but as soon as I add ipv6 (Allow from [::1]) my Apache won't start anymore. I checked the ...
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3answers
2k views

Can I bind a (large) block of addresses to an interface?

I know that the ip tool lets you bind multiple addresses to an interface (eg, http://www.linuxplanet.com/linuxplanet/tutorials/6553/1/). Right now, though, I'm trying to build something on top of ...
3
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1answer
53 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 ...
12
votes
3answers
838 views

Why does /proc/net/tcp6 represents ::1 as ::100:0

I was writing an utility to check /proc/net/tcp and tcp6 for active connections as its faster than parsing netstat output. As I dont actually have ipv6 enabled I was mainly utilizing localhost as my ...
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2answers
96 views

Why is 2002:: an invalid IPv6 addresss?

I'm currently learning IPv6 and during a test I tried to configure an interface with the global IPv6 address 2002:: and failed, stating that is an incorrect address. And I have noticed that if I try ...
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0answers
27 views

IPv6 with IPv4 over RRAS SSTP VPN from Client that only has IPv4 access

I'm setting up Server 2012 R2 RRAS to be a SSTP VPN. I've got IPv4 working perfectly. My environment is dual stack (v4 and v6). When I enable IPv6 on the VPN my client gets a valid address but is ...
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2answers
43 views

DNS: Root hint server 2001:500:1::803f:235 must respond to NS queries for the root zone

We are using IPv4 in our company. Our ISP does not provide IPv6 and this won't change in the next years. The Best Practices Analyzer (BPA) of our Server 2012 R2 DNS server warns about the IPv6 DNS ...
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0answers
18 views

Assigning random IPv6 ranges to ISPs as a security measure [migrated]

Pinging all the IPv4 address space takes about 5 hours (and can generate beautiful maps). Port-scanning doesn't take much longer and can reveal vulnerable services, such as remote administration of ...
1
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0answers
39 views

Linux ipv6 forwarding

Situation I know how to do ipv4 forwarding, and expected ipv6 forwarding to work pretty much the same way. So I configured a VirtualBox host with the network address configured from my ISP. Right ...
0
votes
0answers
32 views

Setting up OpenVPN with IPv6 drops packets

I have tried a multitude of OpenVPN tutorials with zero luck getting OpenVPN up and getting clients to talk to the internet with IPv6. However IPv4 works just fine. The server is Ubuntu 14.10 and ...
0
votes
1answer
1k views

/etc/init.d/iptables-persistent start returns fail but seems to work

I am trying to activate iptables-persistent on an Ubunutu server. Config files are located in /etc/iptables/rules.v4 /etc/iptables/rules.v6 I have installed the iptables-persistent package. ...
2
votes
1answer
985 views

Windows 7 Client gets incorrect IPv6 Prefix Length

I am currently setting up IPv6 and DHCPv6 for Server 2008 R2 on my private network for testing. I was able to get DHCPv6 to work by configuring a static, then setting up the scope. I was also able to ...
2
votes
1answer
277 views

Why does an IPv6 route added before virtual machine is started not work

I have an external server at Hetzner with Debian 7 and trying to setup KVM with IPv6 Routing (the same setup works for IPv4 without problems). I have one Ubuntu Server VM with two interfaces which ...
1
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0answers
32 views

DNS not working with Ipv6

I'm trying to configure bind for ipv6 protocol.I have added the entries to the zone and configuration files but still the ipv6 IPs are not returned when i try for nslookup.Can someone guide me to ...
0
votes
0answers
30 views

How to configure DHCPv6 and DNSv6 configuration in Ubuntu 12.04?

I'm planning to configure DHCPv6 and DNS server in my network. I would like to understand whether both DHCPv4 and DHCPv6 can be configured using isc-dhcp-server service? When i tried nslookup ...
2
votes
1answer
29 views

Identify individuals behind SLAAC addresses

We're operating an IPv4 network (on ethernet & Wifi) in a student dorm with ~200 users and want to deploy IPv6 in the long term, with stateless autoconfiguration on a single /64 prefix. ...
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votes
3answers
77 views

Domain’s NS accessible via IPv6 only [closed]

Imagine a level-2 domain where some (albeit not all) NSes haven’t any A record but have AAAA instead. In other words, some NSes are accessible via IPv6 only. Ī mean, something like: @ IN ...
1
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1answer
26 views

How do I get puppet master to listen on IPv6?

So I have a RHEL 7 server on an internal network with IPv6, and I am able to SSH into it via IPv6 and it is also serving DNS to other hosts over IPv6. I have noticed that puppet master bind to IPv4 ...
5
votes
3answers
3k views

Do you need separate ipv4 and ipv6 listen directives in nginx?

I've seen various config examples for handling dual-stack ipv4 and ipv6 virtual hosts on nginx. Many suggest this pattern: listen 80; listen [::]:80 ipv6only=on; As far as I can see, this achieves ...
0
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2answers
195 views

Cisco PIX 515 ipv6

I know cisco pix 515 is an old and EOL device, but does anyone know if it supports IPv6 or is that completely out of the question?
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1answer
26 views

IPv6 connections from outside the LAN are timing out; what is blocking the connection?

as I understand with ipv6 there is no NAT so every client on a network will get a different public ip address (so there is no need for port forwarding). so I checked on my network and indeed every ...
1
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1answer
63 views

IPv6: differences between “routed prefix” and “link prefix”?

What are the exact differences between "routed prefix" and "link prefix" for IPv6?How do these differences in a wireshark-Trace? (if you observe a Host with an assigned "routed prefix" or a Host with ...
0
votes
1answer
534 views

IPv6 DNS Lookup

I am trying to prevent a webserver to do IPv6 lookups (AAAA) to the DNS-server. The webserver has no IPv6 addresses set-up on the interfaces. Disabling IPv6 in sysctl.conf had no impact either, the ...
0
votes
0answers
27 views

How can i configure a static ipv6-prefix to one linux host [duplicate]

I have a virtual Linux server (Kubuntu 14.04) and i will ask the hosting provider for a complete /64-Prefix for this machine (at the moment i have 4 individual IPv6-Addresses). How do i configure the ...
1
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1answer
73 views

DirectAccess: Client receiving icmp error from Ipv6 address

Pardon my naivety but I have never setup DirectAccess before, I've done some research prior and was unable to find a relevant resource. Let me provide a little background and then I'll jump into the ...
0
votes
0answers
57 views

Can ping from PC to cisco router's ipv6 address (from LAN side) but can't ping from one pc to other's ipv6 address

PCs are connected to Cisco switch and up link goes to Cisco 1841 router on router LAN side interface f0/0 ip add: 2001:xx:xx:xx:1000::64/120. IPv6 is not enabled. I am not able to give prefix length ...
2
votes
1answer
1k views

ip6tables does not allow any traffic

I have been struggling getting ip6tables to work. It is for a CentOS 6 server running DirectAdmin, hence the ports. Could someone please tell me why it does not allow any traffic? Any input on this ...
0
votes
1answer
34 views

How to ping a host with different MTU size to simulate icmpv6 packet too big scenario?

As the Title states,I want to check whether my host will actually send a ICMPv6 packet too big if i send a packet with beyond the defined MTU size.I don't have a cisco router(extended ping) to try out ...
0
votes
1answer
41 views

Two global IPv6 addresses?

What is the scope of the second IPv6 address fdee:de36:ce2c:0:174:d4b5:64b7:33f9 ? Netsh confirms that both are global/public. Is there any reason I get 2 global IPv6 addresses? Wireless LAN adapter ...
0
votes
1answer
35 views

ipv6 static routing is not working

wondering ipv6 static route default route nothing working, only can ping the directly connected interface, but sh run command gave the static routes which I created to other networks, but on the sh ...
1
vote
3answers
53 views

ServerName with IPv6 with Apache

I'm basically trying to redirect every request on :443 to :443. I found this way to do that, which work pretty nicely, once the visitor discard the SSL alert (my certificate isn't valid for my IP, of ...
3
votes
2answers
400 views

Combine lighttpd configs for IPv4 and IPv6

My lighttpd.conf includes the following lines: $SERVER["socket"] == "188.40.236.66:443" { ssl.engine = "enable" ssl.ca-file = "/etc/lighttpd/ssl/startcom.ca.pem" ssl.pemfile = ...
1
vote
2answers
75 views

Am I meant to allocate a /64 to every host?

I have been reading conflicting sources and seeing different behaviours about how a CPE router should be assigning IPv6 addresses. RFC3633 seems to imply that each host should get /64, while RFC6204 ...
7
votes
1answer
516 views

ip6tables rules are completely ignored inside OpenVZ container

We have set up IPv6 networking on openvz using bridged veth devices. The IPv6 traffic to and from the VEs works fine. ip6tables works on the HN and iptables work on the VE. Inside the VE we can set ...
0
votes
2answers
1k views

Disabled IPV6 but still showing in netstat

newbie here, for security best practice I want to disable IPV6 (not to deal with IPV6 firewall settings). I use Hetzner root server Ubuntu 12.04 . /etc/sysctl.conf file already have a setting from ...
3
votes
1answer
2k views

Understanding DHCPv6 Stateful Solicit message

I have been reading the full RFC 3315 and trying to generated spoofed nodes to ask for IPv6 address. (only for practice) Right now, I have a Ubuntu with wide-dhcpv6-server (the DHCPv6 server), one ...
0
votes
1answer
42 views

How to configure DHCPD server to bind static IPv6 address by DUID?

how can i configure the server to make static record DUID - IPv6 ? For example i have such DHCPv6 request: Client Identifier Option: Client Identifier (1) Length: 7 Value: 31303030303133 ...
1
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3answers
2k views

How to remove autoconfigured IPv6 Addresses in Windows 7/2008?

I'm in the process of exploring IPv6 deployment in my network. I've changed the advertised subnet and now my windows PCs have IPs from the new and the old network. I was able to reset the adapter by ...
0
votes
1answer
34 views

Windows translate external IPv6 to localhost IPv4

I have a machine running Windows server 2012, whose external IPv6 address is "2a01:4f8:190:7449::4". Let's assume it has no external IPv4 address, so the v6 address is the only way of accessing it ...
6
votes
1answer
853 views

Debian, 6rd tunnel, and connection troubles

Long story short, I am having issues with IPv6 using a 6rd tunnel with my ISP, Charter Business. They offer a 6rd tunnel that I think I have properly set up, but the server doesn’t reply to every IPv6 ...
24
votes
2answers
687 views

Isn't it a huge security issue to include the MAC address inside of an IPv6 address by default

Many times you don't want to be identified while surfing. For one thing your browsing history might be sold without your knowledge, and with no benefit to you.
4
votes
3answers
153 views

Make reachable via a fixed address (e.g. IPv6) a server that is actually connected via a variable IPv4 adress?

Need: Internet host at a fixed IP address for full-stack self-hosting People want to perform self-hosting in an area where no ISP provide sufficient service with a fixed IP address. They provide one ...
0
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1answer
61 views

How to disable temporary ipv6 address in win7?

I found that the ipv6 link local address was generated randomly in win7,not followed the eui-64 standard. Then I found this link and followed its guide. netsh interface ipv6 set global ...