DNS resolving.

[Ladislav Vobr]

you can dump your cache and see, I guess you will have it. Do you use 
"minimal-responses yes" in your options. If yes these additional A 
records will not be showned.

Also one thing is what bind shows in the responses, and other what it 
has it in it's cache, there are certain uknown (maybe only to me:-)) 
rules, when bind refuses to provide data in it's cache but uses them 
internally. So don't ever think that what you see in the cache people 
(your clients) will see, and don't think that bind will never go and 
query external servers when it has data already in the cache, it it 
subject to bind internal reasoning, and most of the time it is true, but 
not always.

Ladislav.


SIm SIm wrote:
> Hi .. 
> 
> This is my first message to this group. Hope all is doing well.
> 
> I have a running DNS slave server that was upgraded recently to BIND 9.2.3. 
> Everything seems to go well except that im susbecting something im not sure 
> about.
> 
> I tried doing dig to domains, such as yahoo.com and thats what i got
> 
> ------------------------------------------------------------
> 
> # dig NS yahoo.com
> 
> ; <<>> DiG 9.2.3 <<>> NS yahoo.com
> ;; global options: printcmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 8439
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0
> 
> ;; QUESTION SECTION:
> ;yahoo.com. IN NS
> 
> ;; ANSWER SECTION:
> yahoo.com. 165017 IN NS ns5.yahoo.com.
> yahoo.com. 165017 IN NS ns1.yahoo.com.
> yahoo.com. 165017 IN NS ns2.yahoo.com.
> yahoo.com. 165017 IN NS ns3.yahoo.com.
> yahoo.com. 165017 IN NS ns4.yahoo.com.
> 
> ;; Query time: 28 msec
> 
> ------------------------------------------------------------
> 
> there is no any aditional sections showing IPs for these name servers, as i 
> think it should have it. So i can be sure that my DNS is resolving domains.
> 
> Also when trying dig using another server i got:
> 
> ------------------------------------------------------------
> 
> # dig NS yahoo.com @NS.unc.edu
> 
> ; <<>> DiG 9.2.3 <<>> NS yahoo.com @NS.unc.edu
> ;; global options: printcmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 36928
> ;; flags: qr rd; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 5
> 
> ;; QUESTION SECTION:
> ;yahoo.com. IN NS
> 
> ;; ANSWER SECTION:
> yahoo.com. 171610 IN NS ns4.yahoo.com.
> yahoo.com. 171610 IN NS ns5.yahoo.com.
> yahoo.com. 171610 IN NS ns1.yahoo.com.
> yahoo.com. 171610 IN NS ns2.yahoo.com.
> yahoo.com. 171610 IN NS ns3.yahoo.com.
> 
> ;; ADDITIONAL SECTION:
> ns4.yahoo.com. 171600 IN A 63.250.206.138
> ns5.yahoo.com. 171600 IN A 216.109.116.17
> ns1.yahoo.com. 171600 IN A 66.218.71.63
> ns2.yahoo.com. 171600 IN A 66.163.169.170
> ns3.yahoo.com. 171600 IN A 217.12.4.104
> 
> ;; Query time: 162 msec
> 
> ------------------------------------------------------------
> 
> What do you think? is there any problem with my dns ?
> 
> thanks
> 
>