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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191 views

Ubuntu IPv6 port redirect using ufw

I'm trying to configure port redirection from port 80 to 8080 on server with both IPv4 and IPv6 support. The OS is Ubuntu 14.04 with the 3.2* series kernel. It is a production server, so I don't want ...
12
votes
2answers
235 views

How should I temporarily disable IPv6 for an entire network?

We have a medium sized network with IPv4 and IPv6 across it, and our upstream provider is making IPv6 go away for two weeks while they do... something. (It's "experimental" and we don't pay for it, ...
0
votes
1answer
30 views

Odd multicast messages during IPv6 autoconfiguration

So I am trying a little autoconfiguration on some virtual machines while observing what happens in wireshark and trying to understand what how it works, step by step. This is how any of those ...
1
vote
1answer
151 views

hostname command returns nothing on ipv6 host

I have an RHEL host that is dual stacked for ipv4 and ipv6. Ipv6 is the primary, including all DNS records for the host. Ipv4 is a fall back to reach ipv4 only networks, its even behind an ipv4 NAT. ...
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2answers
104 views

IPv6 connection dropping on Debian 7

EDIT: I've tried something different based on searching around. This is now my /etc/network/interfaces: # This file describes the network interfaces available on your system # and how to activate ...
0
votes
1answer
670 views

Tomcat & Java not listening on IPv6

We've got a webserver running Ubuntu 12.04 LTS, Tomcat 7 and Oracle Java. So far, we have been serving a web app on IPv4 address on ports 80 and 443 (80 redirects to 443). I'm trying to make the ...
0
votes
0answers
108 views

vServer: Configuring single (/128) assigned IPv6 addresses for use as IP address pool for IPSEC (Strongswan) road warriors

I've a new (dev) vServer up and running. Unfortunately the provider only hands out single IPv6 addresses (not even /64 subnets). Now I am a bit confused how to achieve the following: I want to use ...
2
votes
1answer
413 views

How do I set up an IPv6 DMZ with iptables without a static allocation?

I have several networks which are on Comcast's residential network. I need to access those networks from a variety of environments, via an SSH proxy on one of the hosts. (As it happens I'm using ...
0
votes
2answers
97 views

How to I forward requests on a IPv6 port to a IPv4 host behind NAT?

I run a Xen Dom0 with 2 VMs NATted (other VMs are bridged, and are ok). This Dom0 has an IPv6 and IPv4 address. Requests to, for example port 25 are forwarded to a LAN address that one of the VMs ...
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votes
0answers
451 views

FreeBSD 10 IPFW IPv6

I'm struggling to allow IPv6 connections on my FreeBSD 10 server. I have a working IPv6 connection. But IPFW blocks all the IPv6 traffic. #!/bin/sh # # flush existing rules ipfw -q flush # allow ...
3
votes
1answer
110 views

Is net.ipv4.vs.timeout_timewait used also for IPv6?

Does this setting for TCP net.ipv4.vs.timeout_timewait apply only to TCP connections established over IPv4 or does it also apply to TCP connections established over IPv6? I have found this for ...
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votes
0answers
174 views

IPV6 not acquired from ipv6 address pool in ubuntu 12.04 for ISC server

Ubuntu 14.04 running in ISC-dhcp-client is not acquiring IPV6 from the pool given in server. Below is vim /etc/dhcp/dhcpd6.conf file default-lease-time 600; max-lease-time 7200; subnet6 ...
1
vote
1answer
197 views

How do I access a machine on an IPv6 address?

We have a CentOS installation, The machine has the IPv6 Address fe80::fc54:ff:fea1:563/64. What address should I specify within my Windows machine so I am able to access the CentOS machine? We are ...
0
votes
1answer
769 views

Mangling traffic from a Mikrotik Router

I have a MikroTik powered Router in the house with a couple of internet connections (2 200/10Mb Cable modems and a 100/20Mb VDSL Line). I am using Mangle rules to set routing marks and NAT rules to do ...
1
vote
0answers
95 views

Red Hat 6.5- sysctl -w net.ipv6.conf.default.accept_redirects=0

I am in the process of writing a Red Hat 6.5 Kickstart disc with hardened security. I have run a program to determine where the weaknesses are in my system, and apparently there is a medium severity ...
2
votes
3answers
498 views

Gmail is Unreachable from Google Compute Engine

I have been getting network is unreachable errors every time i try to use php to mail something out. alt2.gmail-smtp-in.l.google.com [2a00:1450:4010:c03::1a] Network is unreachable ...
2
votes
1answer
112 views

Can I use NAT64 to route public IPV6 traffic to internal IPV4?

I have a bunch of public IPv6 addresses and some services that run IPv4 only. Can I use NAT64 to connect these services? Is there another solution like a proxy or something?
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votes
3answers
770 views

How do i reach IPv4 addresses from an IPv6-only network?

I would like to reach this address via an IPv6 address: http://downloads.openwrt.org/attitude_adjustment/12.09/ar71xx/generic/packages/ In our Freifunk routers there is no DNS available, so the name ...
2
votes
2answers
143 views

IPv6 servers and IPv4 client base

As IPv4 addresses are running out rapidly, a time will come when there will not be even single IPv4 address available for allocation. But, huge number of devices will still be running on IPv4. ...
6
votes
3answers
892 views

DNS servers already use anycast. Will adding more IPs enhance scalability?

RFC 1034 requires us to assign at least two IP addresses for DNS servers. However, redundancy can already be achieved by a single IP address if we use anycast addressing. BGP anycast seems to scale ...
2
votes
1answer
257 views

How to assign multiple IPv6 addresses with DHCPv6 to a single interface?

This seems to be possible based on the spec rfc 3315 page 23: Excerpt: The configuration information in an IA consists of one or more IPv6 addresses along with the times T1 and T2 for the IA. See ...
4
votes
3answers
381 views

In Linux, how can I automatically assign an IPv6 address to an interface based upon its IPv4 address at boot time?

On a CentOS 6 machine, I have a server with 2 NICs, eth0 and eth1. eth0 has address 192.168.0.1. I would like to create a script that parses the IP address of eth0 and assigns a similar-looking IPv6 ...
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votes
2answers
128 views

IPv6 address not available from outside

Since Hetzner pretty much doesn't give out any IPv4 addresses, no matter what the reason is, I decided to give IPv6 a try. These is the assigned IP address subnet mask IPs: 2a01:4f8:190:5112:: /64 ...
12
votes
2answers
724 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 ...
4
votes
2answers
143 views

How can I assign IPv6 addresses based on existing IPv4 addresses?

I have several hundred Server 2008 R2 machines with static IPv4 addresses. I'd like to enable IPv6 on each interface, and then automatically assign IPv6 addresses to them based on their existing IPv4 ...
1
vote
1answer
225 views

Cannot ping from client to internet via IPv6 tunnel

I'm facing an odd issue with my IPv6 setup. I've configured it as follows: /interface 6to4 add comment="SixXS 6to4 tunnel" local-address=zz.yy.xx.94 (my wan ip) mtu=1280 name=6to4-sixxs ...
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votes
1answer
130 views

iptables dual stack - ipv6 not working

I have problem with my iptables setup. I want to have completely dual stacked server so I use same rules for IPv4 and IPv6. However all IPv6 connections are just being dropped while IPv4 are working ...
2
votes
2answers
94 views

Logging the outgoing port for IPV4

I need to become an IPV4 and IPV6 expert in a couple of hours. Our company is being bullied by the internet legislator in our country to move fast to offer the site in IPV6 only (we are just content ...
2
votes
1answer
493 views

Ubuntu 14.04 Ipv6 multicast

I having troubles to setup an IPv6 multicast server with Ubuntu 14.04, the server fails with Invalid argument when try to bind to IPv6 multicast address, checked with mcfirst tool and got the same ...
1
vote
1answer
717 views

Adding a whole IPv6 /64 block to an network interface on debian

I tried adding a whole IPv6 (/64) block to an interface using ip route add local 2001:41d0:2:ad64::/64 dev lo like described here on my Debian server, but I seem to be missing something. If I ping ...
1
vote
1answer
197 views

Linux 6in4 tunnel server can't properly forward IPv6 packets due to failing neighbour discovery

I am trying to set up 6in4 tunnel server on my VPS. Client and server can ping IPv6 address of each other, when I try to ping an outside server from the client, I get ICMP address unreachable error. ...
2
votes
1answer
285 views

Possible to re-enable IPv6 without rebooting?

I have a machine running CentOS 5.8. IPv6 was disabled by creating a file /etc/modprobe.d/disable-ipv6 with the following contents: options ipv6 disable=1 Removing the file and rebooting the ...
15
votes
2answers
950 views

Why is ARIN (etc.) allocating such large blocks of IPv6 addresses?

The whole issue of IPv4 depletion and waste seems to be final getting behind us with the (somewhat) increased deployment of IPv6. The sole purpose of IPv6 was to solve the issue of IPv4 address space ...
0
votes
1answer
145 views

Attack from strange IP address, how to block?

Looking through the mail logs I've noticed a lot of these: Apr 7 11:33:25 s123456 pop3d: IMAP connect from @ [::ffff:192.96.206.9]checkmailpasswd: FAILED: web14p3 - short names not allowed from @ ...
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votes
1answer
104 views

OpenVPN with IPv6 drops packages

I am using OpenVPN (build from tarball) and have a /112 subnet. My server is configured to use tun. IPv4 is working correctly, but IPv6 has some problems: ping6 ipv6.google.com gives no reply. When ...
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votes
4answers
3k views

“Warning: hostname localhost does not resolve to address ::1: No address associated with hostname” inside an openVZ/Debian container

I'm getting the mesage regulary inside mail.log from postfix. In special, but not only, at mails send received mailman. warning: hostname localhost does not resolve to address ::1: No address ...
1
vote
1answer
164 views

4in6 tunnel for heterogeneous systems [closed]

I have clients (OS X 10.9 and Linaro/Ubuntu) in a native IPv6 network and a Server (Debian) in both native IPv4 and IPv6. The Plan is to use the Server as a gateway of sorts, as in 4in6 ...
0
votes
0answers
268 views

Only specify IPv6 suffix in DSM

I'm using a dual stack connection at home and have a DS213+. As my public IP (both v4 and v6) is dynamic, I'd like to only specify a suffix in my Diskstation's network configuration. My router ...
0
votes
1answer
274 views

No server response over IPv6 with NGINX

I decided I would give IPv6 a go for my website, but I am having issues getting my server to respond to requests via IPv6. I have already set up an AAAA record and have had a good go at configuring ...
3
votes
2answers
843 views

DHCPv6: passing delegated prefix to local RA

I currently have an Airport Extreme as my home office firewall. In addition to handling IPv4 NAT, my ISP (Comcast) delegates an IPv6 prefix to the Airport, which in turn assigns the delegated prefix ...
0
votes
0answers
123 views

Couldn't load target `DNAT':No such file or directory

Trying to do some ipv6 nat and running into an error from ip6tables $ip6tables -t nat -N IPV6-BRIDGE $ip6tables -t nat -A PREROUTING -p all -d 2600:3c01::f03c:91ff:fe6e:2563 -j IPV6-BRIDGE $ip6tables ...
1
vote
0answers
63 views

IPv6 and AdvManagedFlag

RA messages have AdvManagedFlag. If this flag is ON then host "should use stateful autoconfiguration to obtain addresses" (RFC 2462). But RA messages are processing by the kernel. How do we know that ...
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vote
2answers
472 views

How to route public ipv6 address to private lxc container address?

I have a pool of public ipv6 address I want to use to expose lxc containers. On the host machine I created a macvlan interface eth0-macvlan and bound a public address to it 2600:3c01:e000:83::1/64. I ...
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votes
1answer
61 views

Worldwide IP Latency [closed]

I want to create a simulation of the protocol MIPv6 (http://www.ietf.org/rfc/rfc3775.txt), for this reason I need information about latency, jitter and round-trip time. My first guess is install ...
0
votes
1answer
246 views

How to enable nfsd to support IPv6 on Ubuntu Linux?

I need to enable IPv6 NFS support on a Ubuntu linux server. This server has support IPv4 NFS. Linux info - root@nimbus-nfsserver:~# uname -a Linux nimbus-nfsserver 2.6.35-22-server #35-Ubuntu SMP ...
0
votes
2answers
237 views

TCP Statistics for IPv6

I'm using Linux RHEL55. I need to collect tcp6 statistics data. if i run "netstat -s", it gives data only for tcp and not for tcp6. But we can get tcp connection status for ipv6 in windows. why we ...
1
vote
1answer
1k views

Fully disable IPv6 for rpc on NFS server - Ubuntu 12.04 LTS

I'm trying to disable IPv6 completely on my NFS server (Ubuntu 12.04 LTS precise), but still seem to have some IPv6 ports listening as shown when I run netstat -lp: Proto Recv-Q Send-Q Local Address ...
1
vote
2answers
327 views

Cisco IOS: Prevent Inter-VLAN IPv6 Network Solicitation messages

I have a Cisco 3825 router that (among other things) functions as a gateway to the internet. I have two VLANS, but only one of them should have access to the internet. VLAN10: network = ...
3
votes
1answer
292 views

How to ping ipv6 interface

I'm trying to get familiar with ipv6 I don't understand why I can't ping this interface at the inet6 addr eth1 Link encap:Ethernet HWaddr 08:00:27:77:9e:77 inet addr:192.168.33.10 ...
2
votes
1answer
365 views

Automatically acquire IPV6 address in CentOS 6

The network has fixed IPv4 address, and automatic acquired IPv6 address. Does anyone have an idea how to setup? Thanks a lot! I didn't use NetworkManager. The following is my setting, but it does not ...