Linux is not appending domain name in DNS query

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# 1  
Old 02-09-2020
Linux is not appending domain name in DNS query

In my /etc/resolv.conf file there is domain name defined. But when I do nslookup the domain name is not appended. Why?

Last edited by rbatte1; 02-10-2020 at 01:59 PM..
# 2  
Old 02-09-2020
In my /etc/resolv.conf file there is domain name defined
Can you be more explicit?
when I do nslookup the domain name

Last edited by rbatte1; 02-10-2020 at 01:59 PM..
# 3  
Old 02-09-2020
cat /etc/resolv.conf 
options timeout 2
options attempts 2

Note that I have kept 2nd server down

Query and response without FQDN:
nslookup -q=A AtypeQuery
;; Got SERVFAIL reply from, trying next server
;; connection timed out; no servers could be reached

Query and response with FQDN
nslookup -q=A

** server can't find NXDOMAIN

Note that non-FQDN elicits "ServFail" response
# 4  
Old 02-09-2020
I think it is adding (at least now) the domain name. But that is not improving the result.
See below the DNS server returns "ServFail" eventually.

command : nslookup shortname
21:57:38.002691 IP > 11322+ A? (37)
21:57:38.003080 IP > 11322 NXDomain* 0/1/0 (109)
21:57:38.003301 IP > 14424+ A? shortname. (27)
21:57:38.003648 IP > 14424 ServFail 0/0/0 (27)

But when I feed the FQDN name in command line it works fine

Command: nslookup
22:00:46.121081 IP > 625+ A? (32)
22:00:46.121716 IP > 625 NXDomain* 0/1/0 (104)

Note that the neither host, FQDN , short exists. I would expect "NXDomain" as opposed to "ServFail" in the first case too.
# 5  
Old 02-10-2020
You probably need to add a search record in your resolv.conf file. The manual page has the appropriate syntax. You can add multiple suffixes if you need to. Do you have a selection you would want to loop through?

I hope that this helps. Give it a try and let us know if you are still stuck.

Kind regards,
# 6  
Old 02-11-2020
Hi Robin, I think I missed something when I posted the question. When query is made for short name, client does append the domainname ( first time. When DNS server returns with NXDomain then client drops the domain name, and tries again. This is when the DNS server results "ServFail" and delays.

So my rephrased question is: Is there any way to instruct the client not to drop the domainname ? Windows client does not drop it.
cat /etc/resolv.conf 
nameserver  (DOWN)

root@VDIkali:~/DNS_RCA# nslookup shortnname_wo_explicit_type
;; Got SERVFAIL reply from, trying next server
;; connection timed out; no servers could be reached
06:25:36.137108 IP > 12245+ A? (55) (The domain is appended in the first try)
06:25:36.137583 IP > 12245 NXDomain* 0/1/0 (127)
06:25:36.137879 IP > 31605+ A? shortnname_wo_explicit_type. (45) (The domain is dropped in the 2nd try)

06:25:36.138216 IP > 31605 ServFail 0/0/0 (45)
06:25:36.138427 IP > 31605+ A? shortnname_wo_explicit_type. (45)
06:25:41.138473 IP > 31605+ A? shortnname_wo_explicit_type. (45)
06:25:46.139362 IP > 31605+ A? shortnname_wo_explicit_type. (45)

# 7  
Old 02-11-2020
You might consider adding the "short name alias" in your /etc/hosts file.
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