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
29 views

How to add IPv6 /64 block to lo (local) interface permanently

I'm using this command line to add /64block IP range to lo network interface. ip route add local 2001:bc8:1234:abcd::/64 dev lo But, when I'm reboot my server. It requires again to execute that ...
1
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0answers
32 views

Multiple IPv6 addresses added to interface, now IPv6 not working on my server [duplicate]

I got /64 IPv6 block from my server provider. When I add few IPv6 addresses (maybe 10 or 20) to network interface. Everything works fine about IPv6 network. When I'm added above 500+ IPv6 addresses ...
0
votes
1answer
19 views

Nginx proxy_pass always sending to [::1]

I am having problems with redirection from Nginx to gunicorn. I'm using proxy_pass to redirect to https://127.0.0.1:5000, and yet the redirect is being sent to https://[::1]:5000. Here is my own ...
2
votes
0answers
37 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 ...
0
votes
0answers
27 views

ipv6 forwarding in linux failing

I have following ipv6 network in my system. X2 & Y2 interfaces belong to Linux and are physical interfaces. X1 & Y1 are external devices. (2000::10)X1<-----------------> X2 ...
5
votes
1answer
192 views

Should I put Scope:Link or scope:Global IPv6 address in DNS AAAA record?

I have a mail server for which I need to create the AAAA DNS record and update the SPF record to include its IPv6 address. An ifconfig command shows a Scope:Link IPv6 address and a Scope:Global IPv6 ...
0
votes
0answers
26 views

ubuntu: add 1000 ipv6 addresses on if-up

I'm trying to configure 1,000 IPv6 addresses using if-up.d. However, when the server is rebooted, they aren't configured properly and eth0 isn't up, even though I'm still able to connect to the server ...
6
votes
5answers
359 views

No IPv6 & DNSSEC support on cc-TLD? (practical implications)

I'm needing to register some domains that have country code domain extensions, but noticed that those TLDs do not officially support (A) IPv6 or (B) DNSSEC... What limitations or pitfalls should I ...
0
votes
0answers
32 views

Unable to bind a large Ipv6 block in Centos 7

I have ipv6block xxxx:xxxx:xxxx:xxxx::/64 block to bind to my interface on centos 7. I have tried to use: ip route add local xxxx.xxxx.xxxx.xxxx::/64 dev lo That was according to the anyip ...
0
votes
0answers
9 views

Is it possible to setup a range of secondary IPv6 addresses in Centos? [duplicate]

Rather than declaring secondary IPV6 addresses one by one in the ifcfg-* file, and get a very long IPV6ADDR_SECONDARIES="...." line, it is possible to declare a range of IPv6 address with a /prefix ...
4
votes
1answer
60 views

Apache (Linux) httpd listen on link-local IPv6 address

I would like Apache to listen on the link-local ipv6 address on a particular interface. I have the following line in my httpd.conf: Listen [fe80::a00:16ff:fe89:420f]:80 Which is based on the Apache ...
0
votes
2answers
46 views

Some IPv6 hosts send all traffic, even in same subnet, to router

I noticed a routing issue with IPv6 with our LAN. Most of the client PCs are LTSP thin clients. They get one address through SLAAC. Tracepath6 to hosts on the same subnet shows all traffic is direct. ...
0
votes
1answer
24 views

Autoconf from /etc/network/interfaces is not working

I want to disable autoconf of IPv6 for which I am making entries in /etc/network/intefaces file as below. Before making this changes I use "ifdown eth0" iface eth0 inet6 static address ...
1
vote
0answers
30 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 ...
0
votes
0answers
29 views

CentOS 7 machines can't ping each other over ipv6

I got three machines configured for ipv6: CentOS 7 vm1 - 2602:306:cc2d:f591::a/64 CentOS 7 vm2 - 2602:306:cc2d:f591::b/64 Macbook - 2602:306:cc2d:f591::c/64 The two VMS are on the same host (a ...
2
votes
1answer
59 views

PTR record format for IPv6

What is the difference in the following two IPv6 PTR formats? 4.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0 IN PTR smtp.example.com. ...
0
votes
0answers
21 views

Windows Server 2012 Local DHCPv6 Stateful & Public Stateless?

I want my LAN to have static IPv6 ULAs from the server's DHCP6, and global IPv6 as well. So it'd look something like this: Server IPv6 Address. . . . . . . . . . . : 2601::1 (public auto) ...
0
votes
1answer
19 views

How to setup this IPSec VPN?

I have a main network (Net-A), there my work should be done there. On the other network, I have host server where it can reach to Net-A. On the host server, I'll create a couple of virtual machines, ...
0
votes
1answer
16 views

SSH Connection reset on IPv6

When attempting to SSH from an IPv6-enabled host to an IPv6-enabled host, I get: $ ssh remotehost.example.com ssh_exchange_identification: read: Connection reset by peer When I add the -4 option, ...
2
votes
0answers
37 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 ...
24
votes
2answers
2k views

Why is IPv6 adoption higher at weekends?

Look at the graph of IPv6 adoption rates maintained by Google here: https://www.google.com/intl/en/ipv6/statistics.html Zoom in to the September to December 2015 period. The graph of IPv6 adoption ...
1
vote
1answer
54 views

IPv6 resolving as loopback/private IP

I'm running a web crawler and I received some reports from my datacenter about connections directing to private IPs (like 10.0.0.1). I've implemented a loopback/private ip check to my crawler code and ...
3
votes
1answer
53 views

Cannot bind to a specific IPv4 address when making outbound TCP connections, to hostnames that resolve to both IPv4 and IPv6 addresses

I just spent about 6 hours trying to figure this out, and I now believe CentOS/Linux is unable to bind to a specific virtual IPv4 address when connecting to a hostname that has an IPv6 address. This ...
2
votes
0answers
44 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 ...
0
votes
2answers
79 views

IPv6 routing under KVM virtualization

I'm having trouble configuring IPv6 routing under KVM virtualization, and I need your help! On the host machine. It uses bridge (named br0) to give its guest machines Internet access. On the guest ...
0
votes
0answers
24 views

Debian Host replies with ICMP Port Unreachable after Router Advertisement (ISATAP)

I'm trying to configure a Debian Wheezy host to get an IPv6 address via ISATAP (using isatapd). This machine has two outgoing interfaces: eth0 and eth0.20 (virtual interface using VLAN 20): 1: lo: ...
1
vote
0answers
57 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 ...
3
votes
0answers
23 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 ...
1
vote
1answer
36 views

Route all Ipv4 traffic over a 6in4 tunnel using RouterOS 6.x

Would it be possible to route all IPv4 traffic over an IPv6 tunnel? Let me elaborate, let's say I establish a tunnelbroker (HE) 6in4 tunnel, using IPv4 (duh!), but then I want to relay all my IPv4 ...
0
votes
1answer
23 views

Cisco IPv6 Proxy-arp like IPv4

Can I disable the proxy-arp in IPv6 in Cisco? I cannot find the "no ipv6 proxy-arp" command in my Cisco router. Please teach me how to do it. Thanks.
2
votes
0answers
59 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 ...
0
votes
1answer
58 views

Enable DHCPv6 in dnsmasq to distribute fixed range IPv6 addresses but failed

Help wanted! I want to create a AP in my Raspbian PI. And i choose dnsmasq as the dhcpv4 and dhcpv6 server. However, my laptop can acquire IPv4 successfully but fail to get a IPv6. Why the dnsmasq ...
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votes
1answer
28 views

IP version in synthetic monitoring context? [closed]

I am trying to setup monitoring on my website and I have encountered with this option IPv4/ IPv6. What could it mean in this context ?
1
vote
0answers
32 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 ...
3
votes
2answers
68 views

How can Apache be configured to listen on a single IPv6 address which does not belong to an interface?

I'm trying to set up multiple Apache SSL vhosts, each on a different IPv6 address. My CentOS7 VPS has a routed /64 IPv6 block assigned to it, let's say 2001:db8:acac:acac::/64, and I can already see ...
0
votes
1answer
26 views

Using CloudFormation, I cannot get an AAAA record to work with ELB

I have the following two CloudFormation resources: "TestELB" { ... }, "TestRecordSetGroup": { "Type": "AWS::Route53::RecordSetGroup", "Properties": { "HostedZoneName": "example.com.", ...
0
votes
0answers
23 views

ipv6 rDNS with bind

Maybe I just can't wrap my head around ipv6 yet but I'm having trouble returning DNS entries for rDNS. Considering the ipv4 scheme, the following is what I'm aiming for: internal.example.com should ...
0
votes
0answers
26 views

Openvpn client frequently uses a different IPv6 address causes a unstable connection

I set up an OpenVPN server on IPV6 recently, it runs well, except for one thing: the client loses connection frequently for Inactivity timeout (--ping-restart). Here's the log infomation on the ...
0
votes
2answers
63 views

How to connect a client behind a NAT router to an Asterisk server behind a NAT router?

I have an asterisk setup on a server. The local IP address is 172.22.9.200 and extenal IP address is 75.45.185.100. My client device is an android phone that is connected to a router and it which ...
0
votes
3answers
44 views

IPv6: Creating ranges, range values

So I've just been assigned a /64 IP address range. I'm using SolusVM to manage virtual machines. With the /64, I am given the first 4 (octets? I think they're called) so my format is currently ...
1
vote
2answers
86 views

Hosting is IPv4 only, can I have IPv6 clients?

My hosting is IPv4 only. My question is whether it is possible to allow IPv6 only clients to access my web (running Window Server 2012 R2). Is this possible using technologies like 6to4 or Teredo or ...
2
votes
1answer
58 views

Multiple default IPv6 gateways

Why is not possible to have multiple default IPv6s gateways configured? On Linux I'm not able to execute two "ip -6 route add default via [gw_ip]", while I'm able to do so with IPv4.
2
votes
0answers
25 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 ...
0
votes
0answers
12 views

In IIS8, does All Unassigned include ipv6?

In IIS8, when editing the site bindings, does selecting All Unassigned in the IP address dropdown box include IPv6 addresses?
1
vote
2answers
53 views

Dual stack linux router, can't forward IPv6 prefix

I have a small offic here with a few workstations and I would like to implement a small server for stuff like a proxy server, samba etc. This is the topology of said network: +-----+ dynamic ...
1
vote
1answer
76 views

nginx virtual hosts not working after enabling IPv6

I've just enabled IPv6 on my nginx 1.8.0 webserver based on Debian Jessie. To do this I've edited my Virtual Host-Config: server { listen 80; listen [2001:1608:10:160:34::2]:80; ...
1
vote
0answers
102 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 ...
0
votes
0answers
43 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
1answer
110 views

Are there Windows services which only run on IPv6?

This network has about 30 Windows-10 computers and all DNS, DHCP, Active Directory, etc. services are provided by Windows 2012 R2. Are there any native services; be it critical, optional, useless, or ...
3
votes
1answer
72 views

Logstash - Graph IPv4 vs IPv6

I'm looking at starting to graph inbound connections to our various services (web, mail, dns etc) by IP version, ie IPv4 connections versus IPv6 connections. Currently the IPs are being stored in a ...