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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1answer
48 views

OpenLDAP using ipv6 link-local address “Can't contact LDAP Server (-1)”

I'm trying to use IPV6 to connect to my LDAP server. Everything works if I use ipv4 but I'm not ipv6 link-local address. I used the following command on my server using its own ipv6 address. Any clue ...
0
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0answers
49 views

ISC DHCPv6 reservation

I've set up ISC DHCPv6 server on a CentOS 7. Here is the /etc/dhcp/dhcpd6.conf: authoritative; option dhcp6.domain-search "example.com"; default-lease-time 3600; max-lease-time 7200; log-facility ...
8
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0answers
456 views

Getting Squid and TPROXY with IPv6 working on CentOS 7

I'm having trouble getting TPROXY working with Squid and IPv6 on a CentOS 7 server. I was previously using a generic intercept setup with NAT, but it was limited to IPv4 only. I'm now expanding the ...
3
votes
1answer
159 views

NRPE allowed_hosts name resolution with IPv6

A fully IPv6 dual stack enabled network is monitored by Nagios 3.5.1 installed from EPEL on a CentOS 6.7 server. Monitored hosts run NRPE agents, all of which are configured to run as daemons (not via ...
1
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3answers
109 views

Why only a single loopback address on IPv6?

IPv4 allocates a whole block of IPv4 loopback addresses, 127.0.0.0/8. IPv6, in contrast, only allocates a single loopback address, ::1. This seems surprising that IPv6 would be so stingy in its ...
1
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0answers
55 views

Radvd sending advertisement to the wrong interface

I have the following radvd.conf file: interface eth0 { AdvSendAdvert on; MinRtrAdvInterval 30; MaxRtrAdvInterval 100; route 2000:e000:0:2::/64 { ...
1
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0answers
143 views

Enabling IPv6 for docker breaks hosts IPv6 connectivity resulting in neither having IPv6 connection

Preface: I am newbie in both Docker and networking stuff, especially, IPv6. Am a software developer, not system/network administrator. I am running Arch on Linode and am looking to set up Docker with ...
0
votes
1answer
30 views

IPv6- loopback and link local addresses

Good Afternoon, I'm a bit new to IPv6 and am curious on a couple of things. The loopback address is reserved as ::1 /128. If the mask is /128, wouldn't that indicate no available bits for hosts as ...
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0answers
15 views

Setting up IPv6 without public prefix [duplicate]

I am not a network engineer, but fill the role at a small company. I am pretty good with IPv4 but am struggling a bit to get things setup with IPv6. The situation I find myself in is that I have 3 ...
0
votes
0answers
114 views

IPv6 VPN routing to IPv4 network

I have been trying to solve my problem to access an IPv6 network from an IPv4 VPN connection for two days now. My setup is as follows: Local Debian IPv4 server <-- OpenVPN --> Remote IPv4/IPv6 ...
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votes
1answer
28 views

How many available IPv6 multicast prefixes are there?

How many freely available multicast prefixes are there? The RFC specifies every ff00::/8 as the required prefix. Accordingly, there are 16*16 = 256 multicast prefixes. However, a large part are ...
0
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1answer
41 views

Name for IPv6 nameserver

I have a few name servers for my dns system. Let's say they are ns1.example.com, ns2.example.com. Previously they all resolved to IPv4 addresses. Now I'm planning to implement IPv6 for my dns system. ...
0
votes
1answer
81 views

Additional static IPv6 address on Ubuntu 14

My ISP gave me a /64 IPv6 subnet, so I'm trying to add a static IPv6 address on top of the one that is already configured in my Ubuntu 14.04.3 LTS. So far, all my attempts failed and I don't know ...
1
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0answers
105 views

IPv6 Ubuntu - Not routing IPv6 to LAN

I'm trying to routing my ISP IPv6 to my LAN. Everything seems ok but clients (on Win7, Ubuntu) not reaching any IPv6 network. Something is missing but idk what. Thanks. ISP Router <-> eth1 ...
1
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2answers
81 views

IPv6 IPsec between two native IPv6 networks

Assume I have two networks, A and B, on sites either side of the globe. Both have native IPv6 and are using (hypothetically) just IPv6. IPv4 no longer exists. They can both access the internet ...
-1
votes
1answer
257 views

Prevent IPv6 address being exposed when connected to IPv4 only OpenVPN

I have a OpenVPN server which has IPv4 only. I have a OpenVPN client which has IPv6 and IPv4. While connected to the VPN the client is exposed to "IPv6 leak". When client visits IPv6 enabled web ...
1
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3answers
702 views

Configure static IPv4 and IPv6 address in OpenSuse 13.2

Please help me to configure both IPv4 and IPv6 address to device eth0 in OpenSuse 13.2, i tried with the following parameters on ifcfg-eth0: BOOTPROTO='static' NM_CONTROLLED='no' USERCONTROL='yes' ...
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votes
1answer
50 views

Apnic & AFRINIC IP Ranges [closed]

Still having pleny of random attacks from China/Russia at our server. I was wondering if blocking based on this address spaces (link to apnic) is safe ? We are located in Europe and we don't have ...
-1
votes
1answer
135 views

wget does not work with IPv6 [closed]

My Debian server has both IPV4 and IPV6 addresses. I am using file_get_contents in my php script to get video titles from youtube: ...
2
votes
1answer
174 views

How do I forward IPv6 to IPv4?

I am testing a LAN network that will be based on IPv6, but without IPv4 support, i cannot connect to other networks. Can I confirure a router to forward IPv6 requests from local network (LAN) to IPv4 ...
0
votes
1answer
229 views

traceroute6 connect: Network is unreachable

I'm experiencing this problem on both Ubuntu 14.04 and Fedora 21, running in Amazon EC2. I have full LAN and Internet connectivity, and I can successfully run traceroute gmail.com But running ...
3
votes
2answers
287 views

Making changes to default IPv6 route persistent in CentOS 7

I have several IPv6 addresses on a CentOS 7 server and need to make a specific v6 address the default address used in routing. I have been able to do this by modifying the route table. ip -6 route ...
3
votes
2answers
171 views

End-to-Site VPN from IPv4 -Host to IPV6 (only) - Site

I want my IPv4 only Clients to my IPv6 only Site. I have a dualstack Server which I could use as a gateway. There is a Question somewhat related here: IPv6-only client to IPv6/IPv4 dual stack server ...
11
votes
2answers
1k views

IPv6 subnetting a /64 - what will break, and how to work around it?

In IPv6, you are not supposed to subnet to anything smaller than a /64 (RFC 5375). Among other things, SLAAC does not work with smaller subnets, and apparently also some other features will break. ...
0
votes
1answer
70 views

How is device to send a response packet selected

I read that when kernel determines a source ipv6 address for the packet, it takes into consideration what interface will be used to send the packet, (http://www.rfc-editor.org/rfc/rfc3484.txt, ...
0
votes
1answer
288 views

Setting up mikrotik router with native IPv6 with only a single /64 block

I am at a colo provider that supplies a single IPv6 /64 block. The goal was to route the provided /64 of IPv6 addresses to the hosts behind the Mikrotik running RouterOS 6.24. Some Mikrotik ...
1
vote
1answer
284 views

RRAS SSTP VPN IPv6 traffic is not able to be routed through server

I have a Windows Server 2012 R2 Essentials box which is configured with the basic RRAS VPN functionality, it isn't configured as a router, this functionality is not enabled and my R2 Essentials box ...
0
votes
1answer
56 views

DNS resolving incorrectly for some countries

European visitors are being served an old version of the website - because it appears they are getting a site that is resolving to an ipv6 address. Other countries resolve to the correct ipv4 IP. ...
1
vote
1answer
230 views

Rule to allow port 80 using IPV6

My server: 64 bit Ubuntu 12.04.4 LTS. Provider: Linode.com. No other firewall is present. I've these rules: *filter # Allow localhost traffic. This rule is for all protocols. -A INPUT -s ::1 -d ...
4
votes
2answers
1k views

ESXi refuses AD join, “The host does not have a suitable FQDN”

I have an ESXi 6 hypervisor (esx.ad.example.com) that I want to join into an AD domain (ad.example.com) with one DC. Both domain controller (dc.ad.example.com) and hypervisor have an IPv6 address and ...
1
vote
0answers
299 views

Openbsd 5.7: IPv6 advertisement not working

--context-- I have a Sokeris with 8 interfaces: em0 is connected to a bridge router (ISP) and em2 is connected to my DMZ network (web servers). I got from my ISP a /56 prefix and 2 DNS IPs but no ...
0
votes
0answers
20 views

can't permanently delete automatic MAC-based inet6 address

Although I never explicitly configured ipv6 on my rhel servers and only have static ipv4 configuration in /etc/sysconfig/network-scripts/ifcfg-eth0, an automatic ipv6 address based on MAC address ...
0
votes
3answers
375 views

how do I stop protocol 41 unreachable packets from being sent?

I'm using a Hurricane Electric tunnel on one of my VPSs, and it isn't working completely. I set up the tunnel with a script basically identical to this one: ...
0
votes
1answer
59 views

ip6tables forward chain filters all ports

Trying the following on a centos 6 node (running openvz kernel) ip6tables -F ip6tables -X ip6tables -P FORWARD DROP ip6tables -A FORWARD -p tcp -m multiport --dports 21,22,80,443 -j ACCEPT ip6tables ...
0
votes
1answer
264 views

Setting up stateful DHCPv6 on Linux

I want to set up a DHCP server on my local network for IPv6 that issues addresses and further information like DNS/NTP and so on. From my ISP I got the IPv6 Prefix which I will refer to as in further ...
0
votes
1answer
63 views

ip6tables port dropping and defaults

On CentOS 6, ip6tables is literally giving a nightmare on this machine. Having ip6tables -P INPUT ACCEPT ip6tables -P OUTPUT ACCEPT ip6tables -P FORWARD ACCEPT with ip6tables -A INPUT -p tcp -m ...
2
votes
0answers
54 views

Is global IP one-to-many communication practical today? [closed]

One-to-many communication over the internet is an enabling technology for many fascinating business and research projects. In principle, IPv4 and IPv6 allow for such communication by the ...
0
votes
0answers
43 views

Bind, IPV6, and Out of Zone Data

I am running into some problems getting bind properly configured to support IPV6 hosts. IPv4 is working fine, no issues. My zone file has both IP4 and IP6 data intermingled which I believe should ...
0
votes
2answers
805 views

Configure IPv6 - CentOS OVH - Can't ping

I can't ping my IPv6 from outside and inside of the server, i can't ping any IPv6. My IPv6 : 2001:41d0:2:XXXX::/64 I use CentOS 6.6 with a Xen Kernel that supports IPv6. My provider is OVH and i ...
3
votes
1answer
111 views

IPv6: ip-based or name-based vhost?

With IPv4 the recommended type of vhosts is name-based since you need only one IPv4 address. IP-based vhosts should only be used if name-based doesn't work (because of TLS for example) With IPv6 ...
0
votes
1answer
137 views

IPv6 Vs IPv4 for geolocation

disclaimer at first : this question is from a noob on IPv6 topic. Our web server initially had IPv6 active and Nginx not configure properly so the users with IPv6 got an error and website did not ...
0
votes
1answer
73 views

Can't ssh after configuring sshd_config

I have configured my sshd configuration files to listen to ipv6 addresses, but forgot to uncomment ipv4 local addresses. Here is a snippet from my configuration file: AddressFamily any ListenAddress ...
0
votes
1answer
280 views

Prevent non-intercept Squid traffic being tagged by Policy Routing

I've re-edited the original question, because I have changed the setup since the original answer, which was for NAT based setup. NAT is no longer being used and has been replaced with TPROXY for IPv6 ...
10
votes
2answers
1k views

Prefer IPv4 incoming connections over IPv6

We run a social/local service that benefits from geolocating the IP of users. The problem is that with IPv6, geolocation is quite a bit spottier than with IPv4. Is there a way to prefer incoming ...
0
votes
2answers
116 views

Delay associated with AAAA request

I have a standalone, isolated network running mixed Windows and Linux systems, with a Windows 2008 R2 server performing AD duties and DNS. I'm seeing 5-second delays with the use of getaddrinfo on ...
1
vote
0answers
374 views

Ubuntu 14.04 ignoring SLAAC IPv6 configuration

I am having issues getting an Ubuntu 14.04 server to pickup an IPv6 address through SLAAC. I have gone through the process of changing all the configuration settings I could find through google, but ...
2
votes
1answer
137 views

Apache VirtualHost wildcards with IPv6

Using Apache 2.4 on Ubuntu, I have the following in ports.conf: Listen XX.73.44.57:80 Listen [2001:XX:0:2c38::39]:80 <IfModule ssl_module> Listen XX.73.44.57:443 Listen ...
1
vote
1answer
244 views

Ipv6 over bridged network stops working after some time (Ubuntu LXC)

i hope you can help me. I am running several Linux Containers on a bare metal server which is provided with an Global Ipv6 address as well as an 64-bit network by my provider. I have configured IPv6 ...
3
votes
2answers
502 views

Why does ip6tables -A INPUT -j DROP blocks outgoing server connections

I'm willing to configure both iptables & ip6tables for IPv6. But for some unknown reason last ip6tables rule in my config block any outgoing connection for my server (apt-get, wget, ping, ping6 ...
0
votes
1answer
54 views

IPv6 users see different site than IPv4 users [closed]

I had a site hosted on 1and1 that I moved to an Azure VM. I found that some people who have IPv6 enabled in their routers (not sure if that's the only situation but it's the one that I came across) ...