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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120 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
87 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
452 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
600 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
180 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
203 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
903 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
130 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
96 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
2k 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
141 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 ...
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votes
0answers
241 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
196 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
665 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
110 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
40 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 ...
1
vote
2answers
398 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 ...
0
votes
1answer
58 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
200 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
173 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
226 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
263 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
281 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 ...
1
vote
1answer
214 views

Many 'Deny IPv6-ICMP reverse path check' alerts from multicast addresses on Cisco ASA

In an effort to prevent IP Source Address Spoofing (RFC 2827) I've enabled reverse path filtering (RPF) on my Cisco ASA 5505. The topology is aprox. like this. Each segment has its own IPv4 subnet ...
1
vote
1answer
50 views

Running authoritive nameserver in ipv6 only environment?

What are the arguments against running an authoritive nameserver (primary) e.g. bind in a ipv6 only environment? In the current setup the machine dedicated to the nameserver has only direct ipv6 ...
3
votes
0answers
79 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 ...
1
vote
2answers
174 views

Ubuntu IPV6 /48 routed over link-local

I have a Ubuntu 12.04 set up with with a /48 IPv6 routed to it. According to the hosts documentation it's an expert only option, described like this: For those customers, we will route the ...
2
votes
2answers
2k views

Why does NTP daemon keep listening on UDP6?

I have a clean Debian 7 installation, and I manually entered the following lines in /etc/ntp.conf: interface ignore wildcard interface listen <local_nic_ip> Hoping that NTP will no longer ...
1
vote
1answer
131 views

How to convert proxy ARP setup to IPv6?

My company has a router/firewall deployed with the "common" Proxy ARP setup: it sits between some servers and the ISP gateway, and intercepts all the packets with proxy arp, so that it can apply both ...
0
votes
2answers
252 views

What ISP needs to provide in order to route native IPv6 /56 range to several VLANs

I have a theoretical question. Network topology is like this: ISP <--- eth0 -> Router1 <- eth1 ----+--> VLAN1 '--> VLANx For the sake of ...
0
votes
1answer
76 views

Routing single v6 /64 range to virtual machines

I am building a virtualisation host, and I want my virtual machines to be available via both v4 and v6 IP address. The host I have (Xen 4.1.3 with Debian Wheezy in dom0) has one physical eth0 ...
0
votes
1answer
506 views

brctl addbr and bonding not working for CentOS6 if IPv6 is disabled

I set up a CentOS6-XEN4-Server according to these instructions. Now I want to set up bridges - first manually: brctl addbr test - but this fails with: "add Bridge failed: Package not installed" ...
0
votes
0answers
252 views

Configuring an IPv6 FreeBSD router works on boot only

I am trying the following: I am having a DHCPv6 server (machine A) with a /48 subnet which will delegate /64 subnets to other routers using the prefix delegation mechanism. One of these routers is a ...
0
votes
1answer
775 views

Multiple IPv6 with single interface on Debian not working

My VPS server assigned 1 IPv4 and 2 IPv6 addresses but only one seems to work. My interfaces config auto eth0 iface eth0 inet static address 184.82.222.136 gateway 184.82.222.1 netmask ...
0
votes
0answers
119 views

How to get IPv6 working on a Debian 6 server

I m getting two IPv6 from my vps provider but they are not working at all. I can ping ping6 ipv6.google.com My interface looks like this: ifconfig eth0 eth0 Link encap:Ethernet HWaddr ...
1
vote
2answers
833 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 ...
0
votes
0answers
420 views

Configuring DHCP IPv4 and static IPv6 on the same interface

I need to configure on a network interface (eth1) with static IPv6 and get an IPv4 address from DHCP on a CentOS 6 machine? Using the configuration below I only get a dynamic IPv4 address: ...
4
votes
3answers
306 views

OpenBSD default gateway outside subnet

My ISP offers IPv6 by default. However, my ISPs IPv6 setup appears to be a bit strange because the default IPv6 gateway is located outside of my servers subnet. Under linux it is possible to setup a ...
1
vote
1answer
29 views

What could be the cause of this IPv6 trouble? [closed]

How come a: curl -v -6 http://badurl.com doesn't work but a: curl -v -6 --head http://badurl.com Perfectly works? MTU isn't the problem (?) since: root@server:~# ping6 -c 10 -s 2000 -M do ...
2
votes
1answer
3k views

Can't do “yum update” in Fedora running in VirtualBox [duplicate]

I just made a clean install of Fedora 20 as a VM in VirtualBox. I set up the VM to use NAT as part of the network configuration in VirtualBox. At first I could ping google.com, but could not browse ...
3
votes
1answer
229 views

Can't get IPv6 setup statically using CentOS6 on a 1and1 dedicated server

I have a server at 1and1 that I'm trying to setup with a set of static IPv6 addresses. I can't get it to work and have tried every forum and guide I could find on google. Their tech support has told ...
0
votes
0answers
138 views

Ipv6 configuration in VPS Server

Currently I have a VPS where I use different ips as interfaces, like curl google.com --ipv4 --interfaces venet0:1 The vps has ipv4 and some ipv6. Usually the vps are managed with OpenVZ, Xen, or any ...
0
votes
1answer
124 views

Server with multiple ipv4 addresses adding ipv6

I've got a dedicated Centos 6.5 server with nginx and 2 ip-addresses (these are 2 ip(v4)-failover addresses from OVH) for hosting 2 different websites on the same server. I want to add ipv6 addresses ...
13
votes
2answers
255 views

How can I 'dip my toes' into dynamic IPv6 network addressing?

Is there any way in IPv6 to enable dynamic addressing and configuration for a subset of hosts on a network identified by specific mac addresses? I have been slowly working at setting up IPv6. All my ...
0
votes
1answer
77 views

amazon ec2 smtp ipv6

I have an Amazon EC2 instance. My postfix server sometimes tries to send outbound emails (web form etc) to ipv6 addresses. It fails and the emails go into the queue. Is there a way to prevent ...
0
votes
1answer
293 views

Trying to add IPv6 route returns an RTNETLINK answers error

On CentOS 5.10 I'm trying to add static IPv6 route via external GW (6::a0c:34a) as follows: ip -6 route add 12::/64 via 6::a0c:34a dev eth1 The above returns a RTNETLINK answers: Invalid argument ...
0
votes
1answer
199 views

Does Fortigate 100A support IPv6? [closed]

Tried searching through the net but couldn't find any info since the product is already discontinued. Can anyone confirm if this particular product supports IPv6?
2
votes
1answer
342 views

Monitoring IPv4 vs IPv6 Traffic

We have a fully functional dual-stack network running in our business. Has anyone found a simple tool for monitoring IPv4 vs IPv6 traffic ratios on a given host? When I say "simple" I'm thinking a ...
1
vote
2answers
196 views

Setting up 2 IPv6 Subnets and ping across Cisco router [closed]

I am trying to setup 2 IPv6 subnets across a Cisco 2621 Router. I am having some trouble... I have assigned: fe0/0 2607:fcb8:10::x:x:x:x fe0/1 2607:fcb8:11::x:x:x:x On the fe0/0 side I have a ...