On Sat, 24 May 2025 21:19:40 -0700 Dave Close <dave@xxxxxxxxxxx> wrote:
> 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.
Check with tcpdump/Wireshark if traffic with the old address still
exists.
> 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
Check which traffic goes in and out and which IP is being used.
--
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