Technical data

4. Packages

simply be switched oﬀ, so that the polling software has to deal with hosts not responding

anyway.

DNS_SUPPORT_IPV6 (optional)

Setting this optional variable to ’yes’ enables the support for IPV6 Addresses of the DNS

server.

DNS Zone Conﬁguration

Dnsmasq can also manage a DNS domain autonomously, being “authoritative” for it. Two

things have to be done to achieve this: At ﬁrst you have to specify which external (!) DNS

name service points to your ﬂi4l and on which network interface the resolution takes place.

The speciﬁcation of an external reference is required because the domain that is managed

by ﬂi4l will always be a subdomain of another domain.

The speciﬁcation of the “outward”

interface is important because the dnsmasq will behave diﬀerent from other “inward” interfaces

there: “Outwards” dnsmasq will never answer queries for names outside of its conﬁgured own

domain. “Inwards” dnsmasq also acts as a DNS relay to the Internet to accomplish resolution

of non-local names.

As the second thing you have to conﬁgure which networks can be reached from outside via

name resolution. Of course only nets with public IP addresses can be speciﬁed because hosts

with private addresses cannot be reached from outside.

Below the conﬁguration will be described with an example. This example assumes IPv6

packets as well as a publicly routed IPv6 preﬁx; the latter can be provided i.e. by a 6in4

tunnel provider such as SixXS or Hurricane Electric.

DNS_AUTHORITATIVE Specifying DNS_AUTHORITATIVE='yes' activates dnsmasq’s author-

itative mode. However, this is not enough, some more information must be given (see

below).

Default Setting: DNS_AUTHORITATIVE='no'

Example: DNS_AUTHORITATIVE='yes'

DNS_AUTHORITATIVE_NS With this variable, the DNS name is conﬁgured by which the

ﬂi4l is referenced from outside using a DNS-NS record. This can also be a DNS name

from a dynamic DNS service.

Example: DNS_AUTHORITATIVE_NS='fli4l.noip.me'

DNS_AUTHORITATIVE_IPADDR This variable conﬁgures the address resp. interface on

which dnsmasq will answer DNS queries for your own domain authoritatively. Symbolic

names like IP_NET_2_IPADDR are allowed. The dnsmasq can only answer authoritative

on one address resp. interface.

Currently only permanently assigned addresses can be speciﬁed. Addresses derived only

by a dial-in (for example, using a PPP connection), can not be used. This will be

corrected in a later version of ﬂi4l.

Important: It should be noted that this should never be an address / interface connected

to your own LAN, otherwise non-local names could not be resolved anymore!

We assume that noone uses a ﬂi4l as a DNS root server...