How to configure tinydns (with fefe’s IPv6 patch) to listen on IPv6 address

djbdnsipv6networking

I'm setting up my network to support IPv6. I have static IPv6 addresses assigned to each interface of my router, and radvd advertising different prefixes on each interface. The next step would be to get my dnscache (from djbdns) working on IPv6. Said dnscache has fefe's IPv6 patch applied, so I assume it should work with IPv6. However, I can't find any documentation online on how to make the patched dnscache listen on IPv6.

How do I configure tinydns and dnscache to listen on IPv6 too?

Best Answer

You need two different tinydns processes if you want "IPv6 too": one binds IPv4 and the other IPv6. You can share the same "tinydns/root" directory between them, so they publish DNS records from the same database and you avoid duplication of data.

To bind IPv6 on the second instance, you just need to set the IP variable to the desired IPv6 address.

If you use daemontools to run djbdns, just do this:

# create two tinydns instances for IPv4 and IPv6
cd /var/service
svc -d tinydns
mv tinydns tinydns4
cp -r tinydns4 tinydns6
# update config for the IPv6 instance
echo 2a00:1450:4001:c02::6a > tinydns6/env/IP
# start both instances
svc -u tinydns*

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How to configure radvd, dhcpd6, routing and /64 subnet based on delegated prefix by DHCPv6-PD server

I don't know the answer to your question, but I just want to warn you about using the DHCP server address as your default router. If that works it is by chance... In IPv6 the default route is communicated by RA's and not by DHCP.

You will need to enable forwarding, accepting RA's and sending out RS's. A problem here is that the kernel included in Centos6 does not allow you to do that. When forwarding is enabled then accepting RA's and sending RS's is disabled. There should be a CentosPlus kernel with the relevant patches though. See the mailing list thread / message at http://lists.centos.org/pipermail/centos/2011-April/thread.html#109756

The relevant sysctl.conf settings are:

net.ipv6.conf.all.forwarding=1
net.ipv6.conf.eth0.accept_ra=2
net.ipv6.conf.eth0.accept_ra_defrtr=1
net.ipv6.conf.eth0.router_solicitations=1

Windows – Static IPv6 address in Windows unused for outgoing connections

The 'random address from the router' is probably your EUI-64 address, which is based on your MAC address. So it is probably not random and will stay stable over time (until you change hardware). Compare your MAC address to your IPv6 address. If your MAC address is 01:23:45:67:89:ab then your IPv6 address will end in ...:0323:45ff:fe67:89ab. You could add a PTR record for that address as well.

But I would like to suggest another solution: if you are sending mail directly to the receiver's mail server then you are running mail server software. You should be able to bind that server software to specific IP addresses. That way your mail server will always use the configured address when making outbound connections, while all other software can use whatever addresses are available on your host (static, autoconf, DHCPv6, privacy etc)

Best Answer

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How to configure radvd, dhcpd6, routing and /64 subnet based on delegated prefix by DHCPv6-PD server

Windows – Static IPv6 address in Windows unused for outgoing connections

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