Servery s reverznimi DNS zaznamy
Petr Soucek
petr na ryston.cz
Úterý Únor 8 12:52:22 CET 2000
Petr Novotny wrote:
> On 8 Feb 00, at 10:55, Jan Satko wrote:
> > nslookup
> > set que=PTR
> > 21.96.87.193.in-addr.arpa.
>
> $dig 4.3.2.1.in-addr.arpa ns
> je o neco presnejsi, kdyz se tedy na to NS chcete ptat, ne? :-)
No kdyztak uz
$dig 3.2.1.in-addr.arpa ns
ale ani to nemusi byt to prave, protoze nikde neni receno, na ktere
urovni probehla delegace. Nejlepsi je podle me stejne
$dig -x 1.2.3.4
a podivat se na "AUTHORITY SECTION"
Zcela jina cesta je jit pres zaznamy v RIPE/ARIN/APNIC databazich, tam
jsou take uvedeny servery zodpovedne za reverzni preklad, na urovni
delegace primo od nich. Muzou byt ale dale delegovany od providera k
zakaznikovi.
Treba kdyz se podivam na nasi sit do RIPE, tak vidim (zkraceno):
inetnum: 194.24.231.0 - 194.24.231.255
rev-srv: ns1.ryston.cz
rev-srv: ns2.ryston.cz
rev-srv: ns1.bohemia.net
rev-srv: ns.multimedia.cz
A digem vidim totez:
[root na ns2 text]# dig -x 194.24.231.12
; <<>> DiG 8.2 <<>> -x
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 4
;; QUERY SECTION:
;; 12.231.24.194.in-addr.arpa, type = ANY, class = IN
;; ANSWER SECTION:
12.231.24.194.in-addr.arpa. 1D IN PTR ns2.ryston.cz.
;; AUTHORITY SECTION:
231.24.194.in-addr.arpa. 1D IN NS ns1.ryston.cz.
231.24.194.in-addr.arpa. 1D IN NS ns2.ryston.cz.
231.24.194.in-addr.arpa. 1D IN NS ns1.bohemia.net.
231.24.194.in-addr.arpa. 1D IN NS ns.multimedia.cz.
Z ARIN databaze muzu dostat (zkraceno):
Netname: IPM
Netnumber: 192.108.136.0
Domain System inverse mapping provided by:
DRS.IPM.CZ 192.108.136.10
NS.MUNI.CZ 147.251.4.33
No a v tomhle pripade dig neukaze nic, prtoze jsou spatne
nakonfigurovany nameservery:
$dig -x 192.108.136.0
; <<>> DiG 8.2 <<>> -x
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 4
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; QUERY SECTION:
;; 0.136.108.192.in-addr.arpa, type = ANY, class = IN
viz "status: SERVFAIL"
Ovsem
$dig -x 192.108.136
; <<>> DiG 8.2 <<>> -x
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 2
;; QUERY SECTION:
;; 136.108.192.in-addr.arpa, type = ANY, class = IN
;; ANSWER SECTION:
136.108.192.in-addr.arpa. 5d9h54m21s IN NS DRS.IPM.CZ.
136.108.192.in-addr.arpa. 5d9h54m21s IN NS NS.MUNI.CZ.
;; AUTHORITY SECTION:
136.108.192.in-addr.arpa. 5d9h54m21s IN NS DRS.IPM.CZ.
136.108.192.in-addr.arpa. 5d9h54m21s IN NS NS.MUNI.CZ.
uz pomuze.
Zdravi
Petr Soucek
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