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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0answers
11 views

Postfix: Different outgoing IPv6 for multiple domain setup

I am serving 3 domains on my linux VPS using Postfix MTA. I have 1 IPv4 and over 65k IPv6 adresses. Because you need correct reverse DNS to avoid the spam filters I want to force Postfix to use 3 ...
2
votes
1answer
928 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 ...
0
votes
0answers
3 views

Running ipv6 tunnel on windows 7 alongside local dns server [migrated]

I am running an IPv6 tunnel via Hurricane Electric in Windows 7, which has been working fine for ages. My router does not support IPv6 at all natively. I am also experimenting with running a local ...
0
votes
0answers
17 views

IPv6 tunnel broker, other devices unable to access ipv6 internet [migrated]

I'm trying to use a Raspberry Pi to set up as a tunnel broker via tunnelbroker.net. I have a simple set up that looks roughly like this: Verizon ISP Switch/IPv4 Router | |----- ...
0
votes
0answers
6 views

IPV6 at home: my ISP delegates me a static IPV6 /56 subnet, how can I set up an IP scheme & DHCP6 for my network? [migrated]

My network looks like this: (Cable Modem/Router) <-> (PfSense Router) <-> (Internal Hosts) The IP (changed for security) of my cable modem is: IPv6 Address ...
0
votes
1answer
59 views

How to configure dynamic DNS updates when using stateless IPv6 addressing?

I am using Server 2012 with AD/DNS/DHCP. I have successfully configured stateful DHCPv6 however this does not accomplish what I would like to achieve so I disabled it and I'm currently trying to get ...
0
votes
0answers
42 views

Lan to internet IPv6 [on hold]

I have 2 iface Lan and Internet with only One IPv6. Over my lan I have a DHCP and DNS server ready for IPv6 support (I use DNSMasq). I'm On OpenVz CT but i can play with kernel module. I use ...
0
votes
2answers
52 views

IP Address reassignation (unused Ip address)

Available IPv4 address blocks are exhausted and price per IPv4 address is increasing. However I read that 2/3 of IP address remains unused because they were assigned improperly at first stages. Since ...
1
vote
2answers
1k views

When does Postfix use IPv6 and when IPv4?

I've configured my mail server for IPv6 and IPv4 but in the most cases it uses IPv4 while IPv6 is available on the remote host. I use Postfix in version 2.9. So my thought was that postfix uses IPv6 ...
1
vote
1answer
21 views

AD Dynamic DNS not working with Linux IPv6

I have an AD DNS/DHCP enabled server. I have mixed Windows and Linux machines/servers. IPv4 is working great with DNS/DHCP, even for the Linux systems. IPv6 is working great except that it won't ...
2
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 ...
2
votes
1answer
65 views

Dual stack Lighttpd without repeating the SSL configuration

I'm trying out Lighttpd and I've stumbled across a small but very annoying problem; the IPv6 configuration is a total mess and requires you to duplicate your SSL settings two times; see for yourself : ...
1
vote
1answer
34 views

Use manually assigned ipv6 address

I have a /48, and from this I assigned a /64 to this lan I have a windows 8.1, which I want to use an assigned ip for outgoing adress. But I keep getting an automatically assigned address. netsh ...
0
votes
0answers
20 views

ISC BIND 9 not answering IPv6 queries

My ISC BIND 9.9.6 server is not answering IPv6 queries. I've done dig @::1 mydomain.org on the server itself and it times out. I've also done it using IPv6 DNS tools and everything fails. I do have ...
0
votes
2answers
79 views

static ipv6 route into a lxc container

I want to route an ipv6 ip to a lxc-container, but the packets are not forwarded. I do not want to bridge the lxc-containers to eth0 and i do not want to use autoconfig. Further i only have a /64 for ...
1
vote
1answer
22 views

ntpd servers stuck in init state when defined by hostname, but sync correctly when defined by IP address

I started having an issue on a couple of our colo servers which is causing a fair bit of head scratching. I as alerted to clock skew on a couple of servers, and when I went to investigate ntpq -=p ...
15
votes
3answers
6k views

What is the IPv6 equivalent to IPv4 RFC1918 addresses?

Having a hard time wrapping my head around IPv6 here. A lot of the lingo seems targeted at enterprise-level IPv6 deployments, discussing link-local, site-local, global unicast, scopes, etc. Not a ...
0
votes
0answers
23 views

Clarification on Tinc VPN Configuration

I've been looking at docs like the tinc manual and Arch's tinc wiki page and am still somewhat mystified as to how to configure my setup. The hosts (all Arch or Debian linux or rooted Android) to be ...
-2
votes
3answers
231 views

Connectivity of IPv6 With IPv4 host

I'm recently working on a project, in which we are provided two network one with IPv6 Connectivity only and other with IPv4 Connectivity only. These two networks are connected to each other with a ...
3
votes
2answers
250 views

IPv6 tunnel broker setup

I'm working on a solution to allow remote Linux nodes that are behind firewalls to be accessible for SSH and web server. Can anyone suggest an IPv6 tunnel scheme that would work with NAT firewalls? ...
0
votes
0answers
4 views

IPv6: Cannot reach outside of LAN (OpenWrt Router connected to ISP Router through Wi-Fi) [migrated]

Hello dear server expert, I would like to ask for you help for my installation. I have a Freebox Revolution (I am French and my ISP is Free). The box provides IPv4 and IPv6. Every computer connected ...
0
votes
2answers
100 views

Does one keep its ivp6 address on different networks?

Assuming I connect on a ipv6 network in Europe and do the same later in the US, I won't keep the ipv6 I was assigned in Europe for use in the US correct? One will be assigned a new ipv6 address at ...
1
vote
1answer
44 views

Telnet over ipv4 proxy to ipv6 host

I have a dante socks server which is configured to listen in an ipv4 IP and to have an ipv6 external IP. I am trying to figure out how to verify if that really works. I tried to use curl but if I ...
2
votes
0answers
48 views

Server 2008 R2 NIC in “Unidentified Network” state after connectivity loss is restored

I am having trouble with 2 servers, both with the same symptoms. When they are reconnected to the switch after losing connectivity, they stay in an "unidentified network" state. Only after cycling the ...
0
votes
1answer
38 views

Binding stunnel on both IPv6 and IPv4

I would like to make a local unencrypted service that listens on 127.0.0.1:8000 available via SSL on both IPv4 and IPv6 on port 8001. Unfortunately, stunnel configuration [Server] accept = 8001 ...
1
vote
3answers
958 views

Linux server not receiving default IPv6 route over PPP link

I'm replacing a pfSense router in a remote office with a small linux device, running Debian. The router only has to handle very basic iptables / DHCP and VPN facilities. It is configured so that the ...
1
vote
0answers
22 views

how to set “Accrept snmp packets from these hosts” with IPv6 address

As I understood SNMP service on windows vista and above supports IPv6. I would like to set the accepted hosts with IPv6 address, how is it done? Using the SNMP service configuration of windows there ...
0
votes
0answers
56 views

Apache Reverse Proxy with IPv6 troubles

Problem: IPv6 Client attempting to contact Server behind reverse proxy fails. In this example, client and server reside on the same machine. Client's IPv6 configuration: ip --oneline addr show 1: ...
0
votes
2answers
971 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. ...
0
votes
1answer
43 views

Are there cases where the value for REMOTE_ADDR will be IPv6?

Even with fairly widespread acceptance/implementation/adoption of IPv6, I have only ever seen IPv4 addresses used for the REMOTE_ADDR value. Assuming I am using the REMOTE_ADDR for things like ...
8
votes
6answers
30k views

Disable IPv6 on Loopback address (Localhost, Computer name, …)

We tried installing a 3rd party software product on a new Windows Server 2008 R2 machine and found that everything works except for accessing local services through loopback addresses such as ...
0
votes
1answer
69 views

How to disable ipv6 support in Linux entirely?

We are currently setting up a some local network servers to run in a full ipv4 network. I can be sure, that this network don't have ipv6 support, and never will. Next to that, partially because of ...
22
votes
3answers
2k views

New service decision: IPv6 or IPv4?

While hosting new service these days, what would be best decision. IPv4 or IPv6 ? If we decided to launch it on IPv4 address: How easy/difficult to get IPv4 address (considering they getting ...
4
votes
0answers
39 views

Setting up IPv6 ACLs on 3com 5500g to block Router Advertisment messages

Is there a way to set up IPv6 ACLs on 3com 5500g switch to block RA traffic on access ports? I couldn't find settings for setting up any IPv6 ACL. Acording to guides, there should be ipv6 specific ...
1
vote
1answer
2k views

Cant connect IPv6 linux server via Putty

Cant connect IPv6 linux server via Putty. Server IP should be like this: 2001:14c0:2:2f6f::6 But when i replace working IPv4 in my putty by this address, it dont connect returning: Unable to open ...
0
votes
1answer
45 views

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# ...
1
vote
2answers
34 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 ...
36
votes
12answers
9k views

Why would you use IPv6 internally?

Of course, I realize the need to go to IPv6 out on the open Internet since we are running out of addresses, but I really don't understand why there is any need to use it on an internal network. I have ...
6
votes
3answers
746 views

Debian 7 how are IPv6 link local addresses set?

It seems like when dhclient runs on eth0 I get an IPv4 address from the DHCP server and a Scope:Link IPv6 address attached to eth0: inet6 addr: fe80::a00:27ff:fed0:4d41/64 Scope:Link But I can't ...
3
votes
4answers
677 views

Can a global IPv6 address be NAT'd to an internal IPv4 address at a firewall-level?

As an organisation we've just requested our first IPv6 allocation. At present we are a wholly IPv4 organisation with a global IPv4 address allocation configured on our edge router and used ...
15
votes
5answers
1k views

IPv6: How to start? (ISP perspective)

In our company we have a range of /21 (2048) IPv4 public addresses. We have a bunch of Cisco routers and servers. How to get started with IPv6? What can we do to provide internet to our clients with ...
0
votes
0answers
21 views

Invisible IPv6 addesses in DHCPv6

A Windows Server 2012R2 provides DHCPv4 and DHCPv6 for the complete network. I wanted to add some reservations for DHCPv6 but the Server responses an error that there's already a Client with the same ...
1
vote
1answer
31 views

Set inet_interfaces for each postfix service

I have a complex postfix setup with dovecot authentication, amavis and spamassassin. The inet_interfaces are set to my IPv4 address, IPv6 address and IPv4 and IPv6 loopback. But I want that the ...
4
votes
2answers
209 views

ADSL router happily accepts IPv6 packets of 2K in size

As I understand IPv6 fragmentation, the routers do not perform fragmentation, only the end-to-end nodes do. And when any router along the path receives a packet larger than the MTU of the link to its ...
2
votes
3answers
1k views

How to enable IPv6 Autoconfiguration with static address in Linux (RHEL)

I have a static IPv6 address I would like to assign. When I add the address to the /etc/sysconfig/network-scripts/ifcfg-eth0 file and restart networking I realize I get several IPv6 addresses. The ...
26
votes
8answers
45k views

“ipv6 equivalent” of 192.168.x.x (configuring a static ipv6 address)

Background: I have a windows 2008 machine and I want to make it a Domain Controller in a test domain made of two virtual machines. dcpromo pops up a warning if IP addresses for the machine are not ...
2
votes
1answer
1k views

curl and wget attempting an ipv6 connection

On my dedicated server (hosted by OVH), that is running a fresh install of Ubuntu 14.04, curl and wget take approximately 10 seconds to complete a simple request. $ curl -v google.com * Rebuilt URL ...
1
vote
1answer
62 views

How to use same MPLS Traffic Engineering tunnel for ipv4 and ipv6

I have MPLS TE configured and working, but it is currently using IPV4 and I needed to include IPV6. My current tunnel configuration is the following: interface Tunnel1 ip unnumbered Loopback0 ipv6 ...
1
vote
2answers
720 views

Something's up with BIND9…slave zone giving SERVAIL for all queries in domain

I've got a domain set up with bind9 on Debian Lenny acting as a slave to my DNS hosting provider's servers. The exact circumstances are I think irrelevant, but I have allowed transfers out to my ...
1
vote
0answers
48 views

ipv6 address assignment via local server from isp assigned block

I have been looking around and found the information confusing as best. Is there a way to have a server "recieve" the /64 ipv6 block from the isp and then use dhcp or something to assign it out to ...