You have multiple choices here.
Loopback is sometimes a bad choice, since the client may try to connect
to itself, and in pathological cases this could cause an infinite loop.
You could consider an A record with RDATA 0.0.0.0, the "null" or
"unspecified" address. It is not legal for that ever to be a destination
address for a connection attempt, so it's marginally safer than 127.0.0.1.
For that matter, you don't need to define *any* A (or AAAA) record in
the zone at all. Then any resolution attempts will get a so-called
"NODATA" response (NOERROR, but 0 answers), which the vast majority of
stub resolvers won't be able to distinguish from NXDOMAIN.
- Kevin
On 9/16/2014 12:20 PM, King, Harold Clyde (Hal) wrote:
I need to block a host in an exterior domain.
Resolve all traffic for example.com from example.com¹s dns servers, but
stop badhost.example.com.
I guess I could become authoritative for badhost.example.com and point the
host to 127.0.0.1.
Does that sound like bad things would happen?
Zone ³badhost.example.com² {
type master;
file ³/etc/named/badhost.example.com.db²;
}
Badhost.example.com. IN SOA localhost (
Admin.localhost
2014091601
3600
900
860000
3600 )
NS localhost.
A 127.0.0.1
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