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
214 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
381 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
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2answers
1k 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
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1answer
162 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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1answer
106 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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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
178 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
284 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
321 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
970 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 ...
1
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0answers
76 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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2answers
509 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
64 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
306 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
305 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
2k 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
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2answers
388 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
314 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
423 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
293 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 ...
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vote
1answer
55 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
137 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
233 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
4k 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
212 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
333 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
92 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
745 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
1answer
1k 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 ...
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vote
2answers
2k 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
455 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
426 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
30 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 ...
3
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
311 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
179 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
149 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
355 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
90 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
397 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
239 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
433 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
273 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 ...
1
vote
2answers
556 views

Can I configure a DNS cache not to forward AAAA queries?

I'm setting up an internal DNS cache because my firewall is having trouble handling all the sessions created by DNS requests. I tried using bind9, dnsmasq and DJB dnscache, they all help reduce the ...
0
votes
1answer
209 views

ip6tables only allow packages to a certain ip-range

I am trying to configure ip6tables to only allow ssh connections to a specific range. In iptables the command would be: iptables -A OUTPUT -p tcp --dport 22 -m iprange --dst-range ...
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votes
2answers
254 views

Cannot browse ipv4 websites (OpenVPN )

I have set up an openVPN tunnel on my VPS (OpenVZ - Ubuntu 12.04). The problem is when I'm connected to the vpn, I can only browse websites which support ipv6 like google. Ipv4 sites aren't loading ...
-1
votes
1answer
217 views

Setup IPv4 local on IPv6 VPS

I have a dedicated server running multiple IPv6 only OpenVZ containers. I want them to be able to communicate with the IPv4 internet, but I realized that isn't going to be possible with IPv6 only. So ...
1
vote
0answers
81 views

snmpget on IPv6 local address timesout though snmpd is listening on ipv4 and ipv6

I am doing snmpget from a RHEL machine to the localhost. It works for IPv4 and doesn't work for IPv6. # snmpget -v2c -c public udp6:[::1] sysName.0 Timeout: No Response from udp6:[::1]. # snmpget ...
11
votes
3answers
6k views

How to prevent delays associated with IPv6 AAAA records?

Our Windows servers are registering IPv6 AAAA records with our Windows DNS servers. However, we don't have IPv6 routing enabled on our network, so this frequently causes stall behaviours. Microsoft ...
2
votes
0answers
205 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. ...