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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8 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 ...
1
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2answers
4k views

Good packet generator tool for IPv6.. Does hping3 support IPv6?

Does anyone of you know any good packet generator tool for IPv6. I am very familiar with hping3, but don't know if it supports IPv6. I am looking for something which can send, tcp, udp, icmp, and ...
3
votes
4answers
1k views

ipv6 Loopback Addresses (equivalent to 127.x.x.x)

I have a development environment set up where I have a separate loopback address for multiple websites. For example, I have the following: 127.0.0.1 www.mysite.dev 127.0.0.2 foo.mysite.dev 127.0.0.3 ...
2
votes
0answers
34 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 ...
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3answers
2k views

/etc/init.d/iptables-persistent start returns fail but seems to work

I am trying to activate iptables-persistent on an Ubunutu server. Config files are located in /etc/iptables/rules.v4 /etc/iptables/rules.v6 I have installed the iptables-persistent package. ...
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votes
0answers
24 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 ...
4
votes
1answer
190 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 ...
2
votes
1answer
560 views

Linux tc Traffic Shaping for IPv6

I have traffic shaping with tc and htb in place and everything works fine for IPv4. Now I want to limit the bandwidth for incoming IPv6 ssh/sftp traffic to some reasonable amount, so it doesn't ...
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 ...
4
votes
2answers
520 views

IPv6: differences between “routed prefix” and “link prefix”?

What are the exact differences between "routed prefix" and "link prefix" for IPv6?How do these differences in a wireshark-Trace? (if you observe a Host with an assigned "routed prefix" or a Host with ...
6
votes
5answers
357 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 ...
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vote
3answers
379 views

Configure static IPv4 and IPv6 address in OpenSuse 13.2

Please help me to configure both IPv4 and IPv6 address to device eth0 in OpenSuse 13.2, i tried with the following parameters on ifcfg-eth0: BOOTPROTO='static' NM_CONTROLLED='no' USERCONTROL='yes' ...
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votes
0answers
31 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 ...
18
votes
5answers
3k views

Can I bind a (large) block of addresses to an interface?

I know that the ip tool lets you bind multiple addresses to an interface (eg, http://www.linuxplanet.com/linuxplanet/tutorials/6553/1/). Right now, though, I'm trying to build something on top of ...
4
votes
1answer
57 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
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 ...
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votes
1answer
22 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 ...
0
votes
2answers
41 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. ...
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
28 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
58 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. ...
3
votes
2answers
202 views

Making changes to default IPv6 route persistent in CentOS 7

I have several IPv6 addresses on a CentOS 7 server and need to make a specific v6 address the default address used in routing. I have been able to do this by modifying the route table. ip -6 route ...
0
votes
0answers
18 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
17 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
15 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, ...
0
votes
1answer
845 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 ...
10
votes
2answers
2k views

How do I use rsync with an IPv6 address via SSH?

I've been having difficulty with connecting to my IPv6 address via rsync. Because the argument for the destination folder is colon-separated, the IPv6 address disrupts this like so: ...
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 ...
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 ...
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 ...
0
votes
2answers
77 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 ...
2
votes
0answers
40 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
0answers
21 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 ...
2
votes
6answers
3k views

How to remove autoconfigured IPv6 Addresses in Windows 7/2008?

I'm in the process of exploring IPv6 deployment in my network. I've changed the advertised subnet and now my windows PCs have IPs from the new and the old network. I was able to reset the adapter by ...
3
votes
0answers
22 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
35 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
21 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.
6
votes
3answers
726 views

Find IPv6 Router advertising a prefix

I am using a Centos 5.5 box. Something on the network is advertising IPv6 prefixes, and I want to know who. One solution would be to install tcpdump or tshark and just look at the network traffic. I ...
2
votes
0answers
58 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
54 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 ...
3
votes
2answers
67 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 ...
2
votes
1answer
1k 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 ...
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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 ?
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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 ...
0
votes
1answer
24 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.", ...
2
votes
3answers
3k views

How to enable IPv6 Autoconfiguration with static address in Linux (RHEL)

I have a static IPv6 address I would like to assign. When I add the address to the /etc/sysconfig/network-scripts/ifcfg-eth0 file and restart networking I realize I get several IPv6 addresses. The ...
0
votes
0answers
25 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
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 ...