RFC1101, network info in DNS. Usefull ?

[Marc Lampo]

Hello,

could somebody comment on the usefulness of RFC1101, network info in
DNS.
It looks promising to me, but I guess it fails when variable length
subnets are used.

If I understand it correctly, an A-RR is put in the reverse map on the
"network level".
Like :
0.0.168.192.in-addr.arpa.  A  255.255.255.192  ; /26
This learns that there are 4 subnets :
192.168.0.0/26, ...0.64/26, ...0.128/26 and ...0.192/26

I see no immediate problem when the last three are further subnetted
(there is no
A-record yet), but suppose the first subnet is further divided into
:...0.0/27 and 0.32/27.
This would imply a second A-RR, wouldn't it ?
0.0.168.192.in-addr.arpa.  A  255.255.255.224

The "complicated, subnetted example" from RFC1101 shows subnets of
subnets as well,
but not of the first subnet.

I'm just guessing that, however potentially interesting it may be,
this RFC is little or not followed at all ?

Greetings,

Marc Lampo

-- --
Security Engineer for C-CURE CBVA, Belgium
Guest teacher of Client/Server Programming @ AT Computing (Dutch only)
Opionions are strictly personal and do not commit either company