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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30 views

Advice on how to parse automated IPV4/IPV6 ARP dumps?

I am wondering how people would parse an file containing the following information: core-juniper spawn ssh -c 3da3 -x -l rancid core-juniper rancid@core-juniper's password: --- JUNOS {master:0} ...
-1
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0answers
17 views

Postfix to Use Ipv6 on Rotation Basis [on hold]

I want to setup my vps to use ipv6 on rotation basis and make ipv4 as incoming for postfix. i have 16-ipv6 address and 1-ipv4 address Need help in configuring the same in my vps. It has centos 64 bit ...
0
votes
0answers
28 views

Can ping from PC to cisco router's ipv6 address (from LAN side) but can't ping from one pc to other's ipv6 address

PCs are connected to Cisco switch and up link goes to Cisco 1841 router on router LAN side interface f0/0 ip add: 2001:xx:xx:xx:1000::64/120. IPv6 is not enabled. I am not able to give prefix length ...
0
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1answer
22 views

How to ping a host with different MTU size to simulate icmpv6 packet too big scenario?

As the Title states,I want to check whether my host will actually send a ICMPv6 packet too big if i send a packet with beyond the defined MTU size.I don't have a cisco router(extended ping) to try out ...
-1
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0answers
12 views

After restart routing does not work

Every time my windows 2008 R2 server restart, routing in my network stop working. I can acces to server remotley from internet but not from network, cannot even ping any pc in network. We found ...
0
votes
1answer
34 views

Two global IPv6 addresses?

What is the scope of the second IPv6 address fdee:de36:ce2c:0:174:d4b5:64b7:33f9 ? Netsh confirms that both are global/public. Is there any reason I get 2 global IPv6 addresses? Wireless LAN adapter ...
0
votes
1answer
31 views

ipv6 static routing is not working

wondering ipv6 static route default route nothing working, only can ping the directly connected interface, but sh run command gave the static routes which I created to other networks, but on the sh ...
1
vote
1answer
33 views

DirectAccess: Client receiving icmp error from Ipv6 address

Pardon my naivety but I have never setup DirectAccess before, I've done some research prior and was unable to find a relevant resource. Let me provide a little background and then I'll jump into the ...
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votes
0answers
25 views

How to check ICMPv6 message support in linux box [closed]

I would like to to check the ICMPv6 support in my linux based board.Basically i want the board to reply with the below mentioned ICMPv6 messages with respect to the scenario. 1 Destination ...
1
vote
2answers
52 views

Am I meant to allocate a /64 to every host?

I have been reading conflicting sources and seeing different behaviours about how a CPE router should be assigning IPv6 addresses. RFC3633 seems to imply that each host should get /64, while RFC6204 ...
0
votes
1answer
26 views

How to configure DHCPD server to bind static IPv6 address by DUID?

how can i configure the server to make static record DUID - IPv6 ? For example i have such DHCPv6 request: Client Identifier Option: Client Identifier (1) Length: 7 Value: 31303030303133 ...
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votes
1answer
30 views

Windows translate external IPv6 to localhost IPv4

I have a machine running Windows server 2012, whose external IPv6 address is "2a01:4f8:190:7449::4". Let's assume it has no external IPv4 address, so the v6 address is the only way of accessing it ...
0
votes
1answer
45 views

How to disable temporary ipv6 address in win7?

I found that the ipv6 link local address was generated randomly in win7,not followed the eui-64 standard. Then I found this link and followed its guide. netsh interface ipv6 set global ...
0
votes
0answers
50 views

Does Cisco IOS support NPTv6?

I'm looking to do a small multi-homing setup which is currently achieved, with IPv4, using NAT. NPTv6 seems to be a good way to do this for IPv6 however I cannot find how to configure this on Cisco ...
0
votes
0answers
20 views

IPv6 DHCP for Hyper-V Guests

I have the following configuration: W2K12 with Hyper-V and DHCP Role installed, and I have IPv6 block. The goal is to assign IPv6 via DHCP to guest VMs, and make guest VM to have access to the ...
4
votes
3answers
136 views

Make reachable via a fixed address (e.g. IPv6) a server that is actually connected via a variable IPv4 adress?

Need: Internet host at a fixed IP address for full-stack self-hosting People want to perform self-hosting in an area where no ISP provide sufficient service with a fixed IP address. They provide one ...
1
vote
0answers
25 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 ...
0
votes
1answer
26 views

ip6tables snat don't work properly [closed]

I got three computers with these names: laptop, vds and home; vds is openvpn server; home is openvpn client. and, I got an ipv6 network 2a01:dead:beef::/64 vds has address 2a01:dead:beef::311 on ...
0
votes
0answers
31 views

Ip6tables firewall make server unreachable on reboot

I am trying to set up a very basic firewall on my server with iptables and ip6tables. My rules get loaded on restart with systemD. The OS is ArchLinux. When I just setup iptables everything works. ...
0
votes
1answer
60 views

My dns server default to link-local IPv6 address and it returns 1.1.1.1

I'm having this weird problem in my network after a power loss (few seconds) but all my network equipment has UPS and it was working fine when the power was out. Soon after the power was back I ...
1
vote
0answers
33 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 ...
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votes
1answer
57 views

How should IPv6 hosts register their name in DNS without using Active Directory?

I have about 25 devices on a complex network that is now IPv6 enabled. Since, in IPv6-land, we use names and not really long IP addresses, how are my boxes supposed to register their dns names ...
0
votes
0answers
72 views

Debian 7 (Proxmox 3.4-1) Venet IPV4/6 & IPV4 Bridge

I recently have been trying to get IPV4/6 working in my openvz containers (by venet) and as of now I have got them up (through trial/error and other data sources that I dont even recall at this ...
1
vote
1answer
52 views

Use manually assigned ipv6 address

I have a /48, and from this I assigned a /64 to this lan I have a windows 8.1, which I want to use an assigned ip for outgoing adress. But I keep getting an automatically assigned address. netsh ...
2
votes
1answer
85 views

Dual stack Lighttpd without repeating the SSL configuration

I'm trying out Lighttpd and I've stumbled across a small but very annoying problem; the IPv6 configuration is a total mess and requires you to duplicate your SSL settings two times; see for yourself : ...
0
votes
0answers
29 views

ISC BIND 9 not answering IPv6 queries

My ISC BIND 9.9.6 server is not answering IPv6 queries. I've done dig @::1 mydomain.org on the server itself and it times out. I've also done it using IPv6 DNS tools and everything fails. I do have ...
1
vote
1answer
65 views

ntpd servers stuck in init state when defined by hostname, but sync correctly when defined by IP address

I started having an issue on a couple of our colo servers which is causing a fair bit of head scratching. I as alerted to clock skew on a couple of servers, and when I went to investigate ntpq -=p ...
0
votes
1answer
93 views

How to configure dynamic DNS updates when using stateless IPv6 addressing?

I am using Server 2012 with AD/DNS/DHCP. I have successfully configured stateful DHCPv6 however this does not accomplish what I would like to achieve so I disabled it and I'm currently trying to get ...
1
vote
1answer
51 views

AD Dynamic DNS not working with Linux IPv6

I have an AD DNS/DHCP enabled server. I have mixed Windows and Linux machines/servers. IPv4 is working great with DNS/DHCP, even for the Linux systems. IPv6 is working great except that it won't ...
1
vote
1answer
126 views

Telnet over ipv4 proxy to ipv6 host

I have a dante socks server which is configured to listen in an ipv4 IP and to have an ipv6 external IP. I am trying to figure out how to verify if that really works. I tried to use curl but if I ...
2
votes
0answers
85 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 ...
0
votes
0answers
36 views

Clarification on Tinc VPN Configuration

I've been looking at docs like the tinc manual and Arch's tinc wiki page and am still somewhat mystified as to how to configure my setup. The hosts (all Arch or Debian linux or rooted Android) to be ...
0
votes
1answer
80 views

Binding stunnel on both IPv6 and IPv4

I would like to make a local unencrypted service that listens on 127.0.0.1:8000 available via SSL on both IPv4 and IPv6 on port 8001. Unfortunately, stunnel configuration [Server] accept = 8001 ...
1
vote
0answers
26 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 ...
0
votes
0answers
90 views

Apache Reverse Proxy with IPv6 troubles

Problem: IPv6 Client attempting to contact Server behind reverse proxy fails. In this example, client and server reside on the same machine. Client's IPv6 configuration: ip --oneline addr show 1: ...
0
votes
2answers
58 views

IP Address reassignation (unused Ip address)

Available IPv4 address blocks are exhausted and price per IPv4 address is increasing. However I read that 2/3 of IP address remains unused because they were assigned improperly at first stages. Since ...
0
votes
1answer
55 views

Are there cases where the value for REMOTE_ADDR will be IPv6?

Even with fairly widespread acceptance/implementation/adoption of IPv6, I have only ever seen IPv4 addresses used for the REMOTE_ADDR value. Assuming I am using the REMOTE_ADDR for things like ...
0
votes
1answer
87 views

How to disable ipv6 support in Linux entirely?

We are currently setting up a some local network servers to run in a full ipv4 network. I can be sure, that this network don't have ipv6 support, and never will. Next to that, partially because of ...
4
votes
0answers
48 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 ...
0
votes
1answer
59 views

Debian Wheezy doesn't answer to ICMPv6 neighbor solicitations

Hello, there. I manage some Wheezy servers with IPv6 enabled on all of them. They all have a global IPv6 /64 block using the first address in the block as the primary, i.e.: root@Host /h/david# ...
1
vote
3answers
46 views

ServerName with IPv6 with Apache

I'm basically trying to redirect every request on :443 to :443. I found this way to do that, which work pretty nicely, once the visitor discard the SSL alert (my certificate isn't valid for my IP, of ...
22
votes
3answers
2k views

New service decision: IPv6 or IPv4?

While hosting new service these days, what would be best decision. IPv4 or IPv6 ? If we decided to launch it on IPv4 address: How easy/difficult to get IPv4 address (considering they getting ...
0
votes
0answers
23 views

Invisible IPv6 addesses in DHCPv6

A Windows Server 2012R2 provides DHCPv4 and DHCPv6 for the complete network. I wanted to add some reservations for DHCPv6 but the Server responses an error that there's already a Client with the same ...
1
vote
1answer
35 views

Set inet_interfaces for each postfix service

I have a complex postfix setup with dovecot authentication, amavis and spamassassin. The inet_interfaces are set to my IPv4 address, IPv6 address and IPv4 and IPv6 loopback. But I want that the ...
4
votes
2answers
222 views

ADSL router happily accepts IPv6 packets of 2K in size

As I understand IPv6 fragmentation, the routers do not perform fragmentation, only the end-to-end nodes do. And when any router along the path receives a packet larger than the MTU of the link to its ...
0
votes
2answers
109 views

static ipv6 route into a lxc container

I want to route an ipv6 ip to a lxc-container, but the packets are not forwarded. I do not want to bridge the lxc-containers to eth0 and i do not want to use autoconfig. Further i only have a /64 for ...
1
vote
1answer
94 views

How to use same MPLS Traffic Engineering tunnel for ipv4 and ipv6

I have MPLS TE configured and working, but it is currently using IPV4 and I needed to include IPV6. My current tunnel configuration is the following: interface Tunnel1 ip unnumbered Loopback0 ipv6 ...
1
vote
0answers
62 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 ...
0
votes
0answers
68 views

LXC Container with public IPv6 network

I have a setup where I wanna be able to access a LXC Container by there public IPv6 Address from public. At the moment I'm getting stuck while trying to access any other net than the network provided ...
1
vote
0answers
94 views

OpenVPN: unable to reach clients over IPv6

Current setup: OpenVPN server with IPv4 and IPv6: [...] port 1234 proto udp6 dev tun server 10.9.8.0 255.255.255.0 server-ipv6 2001:1af8:3100:a00a:0021:a:b:0000/112 client-to-client [...] Clients ...