queries for "_.domain"

[Matus UHLAR - fantomas]

Hello,

I have noticed that BIND sends strange (for me) queries.

     5   0.198221 192.168.0.1 → 193.108.88.128 DNS 105 Standard query 0x15a4 A _.net.akadns.net OPT
     8   0.204738 193.108.88.128 → 192.168.0.1 DNS 159 Standard query response 0x15a4 No such name A _.net.akadns.net SOA internal.akadns.net OPT
     9   0.205400 192.168.0.1 → 193.108.88.128 DNS 112 Standard query 0x3413 A _.office.net.akadns.net OPT
    10   0.211944 193.108.88.128 → 192.168.0.1 DNS 166 Standard query response 0x3413 No such name A _.office.net.akadns.net SOA internal.akadns.net OPT
    11   0.212646 192.168.0.1 → 193.108.88.128 DNS 128 Standard query 0x70df A _.omexexternallfb.office.net.akadns.net OPT
    12   0.218782 193.108.88.128 → 192.168.0.1 DNS 182 Standard query response 0x70df No such name A _.omexexternallfb.office.net.akadns.net SOA internal.akadns.net OPT

Is this a known feature I have missed?

-- 
Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
The early bird may get the worm, but the second mouse gets the cheese.