Not an urgent one, just something to be solved.
My old Microserver died. I had been slowly preparing two Raspberry Pis to take over, but my hand was forced. I got the main server running postfix working reasonably well. To save time, I used the ISP's router for DNS and DHCP, intending to replace them later. After a crash course in postfix and nftables it all seem to be working. Then I switched DNS to BIND9 running on the other Pi. All OK, then an email from this list came in and was bounced for having no PTR. I very quickly restored DNS to the router and investigated. It turns out that the router DNS server, whatever it is, can see bendel, but BIND9 cannot. I've run bind for decades, the last thirteen years on the Microserver, and never had a problem with bendel. The current BIND9 is running without forwarders, as previous versions have. Here's what dig shows: ISP DNS: joe@jrenewsid:~$ dig -x 82.195.75.100 ; <<>> DiG 9.20.24-1+b1-Debian <<>> -x 82.195.75.100 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19280 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 512 ;; QUESTION SECTION: ;100.75.195.82.in-addr.arpa. IN PTR ;; ANSWER SECTION: 100.75.195.82.in-addr.arpa. 851 IN CNAME 100.64-26.75.195.82.in-addr.arpa. 100.64-26.75.195.82.in-addr.arpa. 851 IN PTR bendel.debian.org. ;; Query time: 8 msec ;; SERVER: 192.168.71.1#53(192.168.71.1) (UDP) ;; WHEN: Tue Jul 14 21:21:04 BST 2026 ;; MSG SIZE rcvd: 110 BIND9: joe@jrenewsid:~$ dig @192.168.71.8 -x 82.195.75.100 ; <<>> DiG 9.20.24-1+b1-Debian <<>> @192.168.71.8 -x 82.195.75.100 ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 31340 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1232 ; COOKIE: 52c91b299124cdfd010000006a569a4c89ea67199c61c1fe (good) ;; QUESTION SECTION: ;100.75.195.82.in-addr.arpa. IN PTR ;; Query time: 96 msec ;; SERVER: 192.168.71.8#53(192.168.71.8) (UDP) ;; WHEN: Tue Jul 14 21:21:32 BST 2026 ;; MSG SIZE rcvd: 83 Also ISP DNS: joe@jrenewsid:~$ host 82.195.75.100 100.75.195.82.in-addr.arpa is an alias for100.64-26.75.195.82.in-addr.arpa. 100.64-26.75.195.82.in-addr.arpa domain name pointer bendel.debian.org. Also BIND9: joe@piserve1:~ $ host 82.195.75.100 Host 100.75.195.82.in-addr.arpa not found: 2(SERVFAIL) OK, there's a CNAME involved, but should this really stop BIND9 dead? Any ideas how to fix this? BIND9 seems to work for everything else I tried, and it used to work for bendel on the Microserver, which no longer runs. -- Joe
