I run my own internal name server using my own resolv.conf.
Everything has been running perfectly for years. Yesterday, my ISP
changed my address and now things are flaky. I think I've found and
changed all references to the old address ("find / -type f | xargs
grep -l $oldaddress") but it's not working.
On a local machine, not the name server, I get this result.
$ nmap -sT -p53 $nameserver
...
53/tcp open domain
$ sudo nmap -sU -p53 $nameserver
...
PORT STATE SERVICE
53/udp open domain
$ host ocregister.com
;; communications error to $nameserver#53: timed out
;; no servers could be reached
On the name server machine itself, I get this result.
$ host latimes.com
latimes.com has address 76.223.88.230
latimes.com has address 13.248.222.133
;; communications error to 127.0.0.53#53: timed out
Host latimes.com not found: 2(SERVFAIL)
$ host ocregister.com
ocregister.com has address 192.0.66.2
ocregister.com mail is handled by 30 aspmx3.googlemail.com.
ocregister.com mail is handled by 20 alt1.aspmx.l.google.com.
ocregister.com mail is handled by 10 aspmx.l.google.com.
ocregister.com mail is handled by 30 aspmx2.googlemail.com.
ocregister.com mail is handled by 20 alt2.aspmx.l.google.com.
$ systemctl status named
named.service - Berkeley Internet Name Domain (DNS)
Loaded: loaded (/usr/lib/systemd/system/named.service; enabled; preset: disabled
Drop-In: /usr/lib/systemd/system/service.d
â??â??10-timeout-abort.conf, 50-keep-warm.conf
Active: active (running) since Sat 2025-05-24 20:48:34 PDT; 6min ago
Invocation: 6ab4bfa1fd4347e8a02968b3bb76a8a5
Process: 1197 ExecStartPre=/bin/bash -c if [ ! "$DISABLE_ZONE_CHECKING" == >
Process: 1210 ExecStart=/usr/sbin/named -u named -c ${NAMEDCONF} $OPTIONS (>
Main PID: 1221 (named)
Tasks: 26 (limit: 4586)
Memory: 26.4M (peak: 27.8M)
CPU: 2.270s
CGroup: /system.slice/named.service
â??â??1221 /usr/sbin/named -u named -c /etc/named.conf
The firewall on the nameserver has port 53 open both to TCP and UDP.
So how is possible that I sometimes get a valid reply and sometimes I
get a timeout, both from another machine and from localhost? The results
are not reliably repeatable; sometimes I get the failure and sometimes
I don't.
Both machines are running Fedora 41, fully updated.
--
Dave Close, Compata, Irvine CA +1 714 434 7359
dave@xxxxxxxxxxx dhclose@xxxxxxxxxxxxxxxxxx
"... all authority is capricious, but may be appeased
by a show of zeal, unaccompanied by any real work."
-- Robertson Davies in "What's Bred in the Bone"
--
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