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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11
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604 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 ...
5
votes
0answers
117 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 ...
5
votes
0answers
262 views

Different 'ping6' reverse lookup behavior using ipv4 vs ipv6 dns servers in /etc/resolv.conf

I'm hoping someone could help shed some light on the different behavior ping6 is demonstrating on a GNU/Linux box. The machine is a Linode host which has been assigned both an IPv4 and IPv6 address. ...
4
votes
0answers
202 views

Exchange 2007 not delivering to primary MX of one domain

I'm trying to send email to a domain that has two MX records. The higher priority record is IPv4 and the 2nd is IPv6. Exchange gives me a delivery is delayed message in my inbox after I've tried to ...
4
votes
0answers
342 views

Some systems not attempting to register IPv6 reverse

I have a few Windows 2012 systems in my domain that are not dynamically updating their records in the ip6.arpa zone for their assigned IPv6 addresses. I have systems that are publishing their record ...
4
votes
0answers
1k views

IPv6 default gateway route disappear after reboot

I'm using Debian Wheezy on a dedicated server which uses IPv4 and IPv6 at the same time. ifconfig eth0 eth0 Link encap:Ethernet HWaddr 11:11:11:11:11:11 inet adr:90.0.0.1 Bcast:90....
4
votes
0answers
1k views

IPv6 routing over OpenVPN

Trying to learn how IPv6 works with OpenVPN, so I wanted to setup following scheme. I have a VPS server (Ubuntu), which have been allocated a /48 subnet. ISP ipv6 gateway is XXXX:XXXX:XXXX::1 Server ...
4
votes
0answers
2k views

ip6tables port redirect with TPROXY on IPv6 only

Our server is IPv6 only connected and an applications listen to port 8080 at private network, but we need port 80 at public Internet. On purpose of testing, when opening the firewall for port 8080, ...
4
votes
0answers
2k views

NAT64 configuration with tayga on Debian 6

I'm trying to implement NAT64 with tayga on my server and came to a point where I'm not sure how to proceed. My server is connected via one IPv4 address and one /64 IPv6 address block to the internet....
4
votes
0answers
1k views

Enabling IPv6 with OpenVZ using Proxmox 2.2

I'm trying to enable IPv6 on my Debian nodes (OpenVZ) using venet; my host is under Proxmox 2.2 (kernel 2.6.32-16-pve), and it seems the routing fails. My host correctly pings all my nodes; all my ...
3
votes
0answers
61 views

How can I identify a rogue IPv6 DHCP server on my LAN?

This will be kind of a long post, but I want to give complete information. I have a home/business LAN with isc-dhcp-server running an ipv4 dhcp server and bind as a DNS server running on an ubuntu ...
3
votes
0answers
92 views

Cannot renew DHCPV6 lease in SLES12

I need to renew the lease of a certain SLES12 box. The machine is configured to use IPv6 only and so far I have tried the following: From here: dhclient6 -r -v eth0 && rm /var/lib/dhcp6/...
3
votes
0answers
353 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 ...
3
votes
0answers
295 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 ...
3
votes
0answers
713 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 ...
2
votes
0answers
161 views

How to use an IPv6 Edge router in an IPv4 network?

Background I have the following set-up: I use 6LOWPAN (IPv6 implementation in IEEE 802.15.4) on my sensor link that have IPv6 addresses (stateless) as aaaa::xx/64 It uses RaspberryPi (RPI) as an ...
2
votes
0answers
66 views

Route single IPv6 address using router advertisement

I have a server in my local network that connects to an external VPN server and gets assigned the public IP address 2a02:c200:1:10:3:0:4315:2. Currently, when other computers in my local network ...
2
votes
0answers
131 views

Nginx proxy_pass to upstream uses sometimes IPv6 address

Why does Nginx proxy_pass to upstream send sometimes outgoing requests to IPv6? 2015/12/28 14:11:06 [error] 38194#0: *114469948 connect() failed (111: Connection refused) while connecting to upstream,...
2
votes
0answers
76 views

ping between ipv6 and ipv4 networks

I have 2 networks (one ipv4 and one ipv6) , I used ospf as routing protocol for both networks. I activate bgp between this 2 networks(R6 and R1) and now R6 can ping the full ipv6 network and R1 can ...
2
votes
0answers
106 views

How to disable IPv4 use on OSX (Or disable Happy Eyeballs)

I have a OSX El Capitain (10.11.2) host that has only IPv6 connectivity. The network uses NAT64 and DNS64 to provide access to legacy IPv4 hosts on the internet. The problem is that when looking up a ...
2
votes
0answers
45 views

Windows Firewall Connection Security, require encryption with IPv6?

I've set up Windows Firewall on a Server 2012 R2 to always require IPSec Encryption for all Connection Security Rules. I've then specified Inbound Rules for specific ports and services, and ...
2
votes
0answers
142 views

Limit odhcpd SLAAC / RA to specific MAC addresses

I am trying to set up my OpenWRT powered router to give me IPv6 connectivity via tunnelbroker.net (he.net). I am using OpenWrt Chaos Calmer 15.05-rc2. Creating the tunnel works fine, but I'd like to ...
2
votes
0answers
351 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 now,...
2
votes
0answers
411 views

Why “scope link” ipv6 address can be pinged via interfaces which they are not active on

[root@2_01 ~]# /sbin/ip -6 addr show pubeth0 inet6 2001:1::6/64 scope global inet6 2001:1::1/64 scope global inet6 fe80::20c:29ff:fe69:f9e8/64 scope link [root@v2_01 ~]# /sbin/ip -6 addr show ...
2
votes
0answers
424 views

How do I get IPv6 packets to my KVM virtual machine?

My setup is: Debian Wheezy x64 on the host and on the guest. I am using a tun/tap setup to connect a virtual machine to the host. The KVM network options I use are: -net nic,macaddr=DE:AD:BE:EF:1A:...
2
votes
0answers
329 views

ISC DHCPD IPv6 for multiple interfaces

I want to assign multiple IPv6 to a server with multiple NIC. As IPv6 RFC defines, each server has a unique DUID that can have one of the 3 formats (LL, LLT or enterprise). And each NIC has an IAID. ...
2
votes
0answers
509 views

Networking with lxc containers with local dhcp and external ipv6 double bridge problems

I want to use both ipv6 externally on all my containers, and ipv4 external only on the hosts. I am using Ubuntu 12.04 64bit. For ipv4 on the container I use the DHCP that came with the lxc ...
2
votes
0answers
913 views

KVM Guests & IPv6, Connectivity breaks after some time

Goal: Assign public available IPv6 adress to every guest Problem: Working IPv6 connectivity suddenly stops working. After starting everything up (network on host, guests) everything works fine. i can ...
1
vote
0answers
32 views

Debian 7 losing IPv6 default route randomly

I have a Debian 7 server setup and it keeps losing IPv6 connectivity after some time. I found that the default route is removed and is what appears to cause the Issue. Any help to fix the issue would ...
1
vote
0answers
31 views

Delayed Ping of a link-local address with Windows 7/Server 2008 R2/Server 2012 R2

I have a strange effect here, which I do not understand. PS C:\Users\user1> ping fe80::219:bbff:fe0e:c600%16 -t Ping wird ausgeführt für fe80::219:bbff:fe0e:c600%16 mit 32 Bytes Daten: Zielhost ...
1
vote
0answers
92 views

IPv6 Routing // Destination unreachable: Beyond scope of source address

I want to setup Dual Stack on Customer VMs. The Router is a VM too. Running on Debian Wheezy. Overall virtualized by ESXi. IPv4 is working fine. Ping from Customer VM ping6 -c 1 heise.de PING heise....
1
vote
0answers
17 views

Assigning Prefix-Flexible Static IPv6 Addresses to Servers

Sometimes it's desirable to assign a server a static IPv6 addresses. Hand-configuring a static global unicast IPv6 address is one way to do this but necessitates manual updating any time the address ...
1
vote
0answers
88 views

Ensure systemd wait for IPv6 before start service unit

When I have a service listening on a specific IPv6 address, it fails on boot, claiming that the address is still not available. This happens to every service that is listening on specific addresses. ...
1
vote
0answers
38 views

What is the significance of a router advertisement prefix with L and A bits set to 0?

RFC 4861, section 4.6.2 describes the prefix option for router advertisement packets. There are two flags that are part of that option L and A which indicate the prefix is usable on-link and for SLAAC ...
1
vote
0answers
63 views

Can you enable IPv6 anycast on a Microsoft DNS server?

I have an anycast address assigned to a Windows 2012R2 server and I can ping it from across subnets. The DNS service doesn't see it as an address it can listen on and nslookup (from the server itself)...
1
vote
0answers
209 views

Build IPv6 over IPv4 tunnel between server and home network

On one side I have an Ubuntu server in a data center that has IPv6 connectivity. The eth0 interface has a public IPv4 and also a public IPv6 /48. From that server I can ping IPv6 addresses OK. On the ...
1
vote
0answers
126 views

Routing IPv6-traffic from client via OpenVPN-server

For playing and learning purpose i set up an OpenVPN-server. Im currently attached to a network without IPv6. Because of that, I would like to route all IPv6-traffic via the VPN. With IPv4 and ...
1
vote
0answers
69 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
vote
0answers
188 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 ...
1
vote
0answers
124 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
vote
0answers
401 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 ...
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vote
0answers
441 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 ...
1
vote
0answers
246 views

Make LXC containers directly accessable with ipv6

First off I have a special IPv6 address allocated to my dedicated server, just 1. A ::1/128 one. But I can assign addresses to eth0 (eg ::2/128, ::3/128, etc). Now I would like to run LXC containers ...
1
vote
0answers
119 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 ...
1
vote
0answers
130 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 ...
1
vote
0answers
157 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 ...
1
vote
0answers
176 views

Ubuntu Router to connect two networks via IPv6

I am currently in the situation that I want to add one network of homogenous linux nodes to an already existing windows network. For administrative reasons the linux nodes are not going to be added to ...
1
vote
0answers
92 views

IPv6 Forwarding between interfaces

I am attempting to simulate an ipv6 wan (on an airgapped network). I have a CentOS 6 machine in the middle with eth1 and eth2 each pointing to an ipv6 network (call them "north" and "south"). North ...
1
vote
0answers
201 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 ...
1
vote
0answers
98 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 ...