Radvd and DHCPd. 6 Server Configuration for Dynamic DNSI’ve been using radvd for a while now to hand out IPv. Dogghouse, and I thought that it would be nice to have a working dynamic DNS setup for IPv. I have DDNS for IPv. First, we need to configure radvd to advertise the IPv. RADVD with DHCPd. Adv. Managed. Flag on. Adv. Send. Advert on. Adv. Autonomous off. Adv. Other. Config. Flag on. Min. Rtr. Adv. Interval 3. Max. Rtr. Adv. Interval 6. This is a very basic radvd setup, which will just advertise the routing gateway to the network, and nothing more. If we are going to use DHCPd. Make sure to change the interface name in the example to the interface name you will be handing out IPv. I have multiple interfaces bridged for my internal network and use interface br. If you want to use radvd to hand out addresses, then just use the following example instead.# RADVD with no DHCPd. Adv. Managed. Flag on. Adv. Send. Advert on. Adv. Autonomous on. Adv. Link. MTU 1. Adv. Other. Config. DNS v1.11 – Aaron Balchunas * * * All original material copyright © 2010 by Aaron Balchunas ( [email protected]), unless otherwise noted. Flag on. Min. Rtr. Adv. Interval 3. Max. Rtr. Adv. Interval 6. Adv. On. Link on. Adv. Router. Addr on. Again, make sure to change the interface to your interface name, and change the IPv. Now, to use DHCPd for IPv. DNS Server and DNS Server Roles Overview Before DNS, HOSTS files were used to resolve.IPv. 6 addresses, since DHCPd can’t give out both IPv. IPv. 6 addresses at the same time. If you already have a working IPv. DHCPd setup, you can use a lot of the same configuration values in your DHCPd. Below is a basic configuration for DHCPd. Range for clients.
Example of a fixed host address. This configuration will get also give out a fixed address to one of our clients, to ensure that it always gets the same IPv. Make sure that you replace the IPv. Notice the line include "/etc/rndc. This is where I keep the key that the DHCP and DNS servers use to allow updates, so we don’t have unknown unauthorized outside sources modifying our DNS records! Below is what my rndc. Finally, we need to make sure that our DNS server is configured to accept updates for our zones. In our named. conf file, we need our rndc key, controls, and zone info. Finally, make sure that you have the correct firewall rules in place to accept DHCPd. You’re going to need to accept ipv. TCP and UDP traffic on ports 5. Here are some basic ip. DNS and DHCP via IPv. A INPUT - m state - -state RELATED,ESTABLISHED - j ACCEPT. A INPUT - p ipv. 6- icmp - j ACCEPT. A INPUT - i lo - j ACCEPT. A INPUT - p tcp - m tcp - -dport 5. ACCEPT. - A INPUT - p udp - m udp - -dport 5. ACCEPT. - A INPUT - p tcp - m tcp - m multiport - s fe. ACCEPT - -dports 5. A INPUT - p udp - m udp - m multiport - s fe. ACCEPT - -dports 5. Now, this is a pretty basic setup, but should get you rolling with a working DHCPd. DDNS setup! One thing to note, I have found that Android devices (a 2. IPv. 6 addresses from our DHCPd. DHCPd. 6 server. Android devices will however get stateless autoconfiguration addresses from a radvd standalone setup. Perhaps this is a misconfiguration on my part, or an incompatibility in the Android OS; if you have any idea please let me know!
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