Question about "Bogus LOOPBACK" message

[Kevin Darcy]

My guess is that some nameserver gave you a referral to a nameserver that
resolves to 127.0.0.1. This is obviously bogus. Since you have obscured the
actual domain names involved, it's impossible to tell why you may have received
such a referral, or what you might be able to do about it.


- Kevin

Takahiro Sato wrote:

> Hello,
>
> I am in trouble with DNS log message(syslog) of internal DNS,
>
> "sysquery : query(SOME-DOMAIN-NAME) Bogus LOOPBACK A RR (localhost:127.0.0.1)
>  learn (A=localhost:NS=A.B.C.D)"
>
> (*) A.B.C.D is External DNS server address.
>
> If anyone have any idea, please teach me about this.
>
> Thanks!
>
> This illustrates my DNS server environment.
>
>                   THE INTERNET
>                  /             \
>                 /               \
>                /                 \
>  |---------------|  forward    |---------------|
>  | Internal DNS  |------------>| External DNS  |
>  | (foo.prv)     |  root NS    |  (bar.xyz)    |
>  |               |------------>|               |
>  |---------------|             |---------------|
>         |
>         | private network
>         |
>     ---------
>     |Client |
>     ---------
>
> Internal DNS
>    Multi-homed DNS(it is connected to private network
>    and INTERNET).  It is authority of foo.prv that is
>    private network zone. Query of the name other than
>    "foo.prv" is forwarded to external DNS. If its
>    forwarded (recursive) query is not answered, then
>    internal DNS sends (non-recursive) query to external
>    DNS(as root nameserver).
>
> External DNS
>    This nameserver is authority of "bar.xyz.". It's
>    connected to INTERNET.
>
> Internal DNS configuration like this,
>
>   options {
>           forwarders {
>                   A.B.C.D;   // it's External DNS's IP Address;
>           };
>   };
>
>   zone "foo.bar" in {
>           type master;
>           file "db.foo.bar"; // private network
>   };
>
>   zone "10.in-addr.arpa" in {
>           type master;
>           file "db.10";
>   };
>
>   zone "." in {
>           type hint;
>           file "root.cache"; // In "root.cache", External DNS
>                       // is specified as ROOT nameserver.
>   };
>
> ---
> E-mail : t_sato at rbec.co.jp