Named Error Unexpected Rcode Servfail
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"error (unexpected RCODE REFUSED)" mean? Posted by Eric on 14 July 2015, 1:29 am If you're seeing this in the /var/log/syslog on your BIND DNS server: Jul error (formerr) resolving 14 00:56:13 kla-dns-01 named[8255]: error (unexpected RCODE REFUSED) resolving '75.1.33.112.in-addr.arpa/PTR/IN': 211.136.17.105#53
Rcode Refused Dns
..it means that a client has asked your server to look up a domain name that your category lame-servers {null;}; server didn't know about, and when it forwarded the request to it's forwarders, the remote DNS server refused to respond. A packet trace on your DNS server lame server resolving shows exactly what's happening: root@dns1:/# tcpdump -n -s 1514 -v 'port 53' tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 1514 bytes 00:56:09.686771 IP (tos 0x0, ttl 62, id 44942, offset 0, flags [DF], proto UDP (17), length 70) 10.5.11.101.42237 > 10.0.10.10.53: 17985+ PTR? 75.1.33.112.in-addr.arpa. (42) ^… One of your clients sends a request
Unexpected Rcode (servfail) From Master
to your DNS server asking for the reverse-IP request (a "PTR" request) for the domain-name corresponding to IP address 112.33.1.75 (expressed in reverse as "75.1.33.112.in-addr.arpa.") 00:56:09.687284 IP (tos 0x0, ttl 64, id 28584, offset 0, flags [none], proto UDP (17), length 81) 10.0.10.10.6374 > 10.0.0.2.53: 26305+% [1au] PTR? 75.1.33.112.in-addr.arpa. (53) ^… The DNS server forwards the reverse-IP request to it's "upstream" forwarder DNS server, 10.0.0.2. 00:56:12.218438 IP (tos 0x0, ttl 64, id 39251, offset 0, flags [none], proto UDP (17), length 81) 10.0.10.10.27738 > 211.136.20.201.53: 63185% [1au] PTR? 75.1.33.112.in-addr.arpa. (53) ^… After 3 seconds without a reply, the server sends the request to it's next forwarder, 211.136.20.201. 00:56:13.018706 IP (tos 0x0, ttl 64, id 34335, offset 0, flags [none], proto UDP (17), length 81) 10.0.10.10.37801 > 211.136.17.105.53: 55483% [1au] PTR? 75.1.33.112.in-addr.arpa. (53) ^… 800ms later, the server repeats the request to it's forwarder, 211.136.17.105. 00:56:13.251686 IP (tos 0x4, ttl 53, id 48502, offset 0, flags [none], proto UDP (17), length 81) 211.136.17.105.53 > 10.0.10.10.
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Hello, I'm having some troubles setting up a master/slave configuration for my DNS. Right now I have a Redhat server (dnsnsbrhgate.linux.cs460) and a Windows server (dnsnsbwingate.windows.cs460) and I am trying to set the Windows DNS up as a slave on the Redhat server. My named.conf looks like this (snipped to important part): Code: zone "linux.cs460." IN { type master; file "linux.cs460.zone"; }; zone "10.68.192.in-addr.arpa." IN { type master; file "192.168.10.zone"; }; zone "windows.cs460." IN { type slave; file "windows.cs460.zone"; masters { 192.168.10.120 ; }; }; I have a windows.cs460.zone file where all my other zone files are, however it is empty (I am under the impression that this does not need to be filled in?) The error that I am getting when I try to ping dnsnsbwingate.windows.cs460 is: Code: ping: unknown host dnsnsbwingate.windows.cs460 When I restart named.conf my logs show this: Code: zone windows.cs460/IN: refresh: unexpected rcode (SERVFAIL) from master 192.168.10.120#53 (source 0.0.0.0#0) The results of me digging dnsnsbwingate.windows.cs460 is: Code: ; <<>> DIG 9.3.4-P! <<>> dnsnsbwingate.windows.cs460 ;; global options: printcmd ;; Got answer ;; ->>HEADER<<- opcode: query, status: SERVFAIL, id: 21161 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION ; dnsnsbwingate.windows.cs460. IN A ;; Query time 6 msec ;; SERVER 192.168.10.120#53(192.168.10.120) ;; WHEN Mon Nov 24 12:20:27 2008 ;; MSG SIZE rcvd: 45 Any ideas? nbakewell, Nov 24, 2008 #1 till Super Moderator Staff Member ISPConfig Developer Did you setup the slave zone with ISPConfig? till, Nov 24, 2008 #2 nbakewell New Member Using ISPConfig on Redhat? Or on Windows? No, I don't recall issuing any ISPConfig commands... nbakewell, Nov 24, 2008 #3 till Super Moderator Staff Member ISPConfig Developer You posted this in the forum for the ISPConfig hosting control panel. I will move you post to another forum as you dont semm to use ISPConfig. till, Nov 24, 2008 #4 falko Super Moderator ISPConfig Developer Where's the master for the windows.cs460 zone? falko, Nov 25, 2008 #5 nbakewell New Member The master for windows.cs460 is linux.cs460, on Redhat. nbakewell, Nov 25, 2008 #6 falko Super Moderator ISPConfig Developer But you've configured linux.cs460 as a slave for that zone: Code: zone "windows.cs460." IN { type [B][COLOR="Red"]slave[/COLOR][/B]; file "windows.cs460.zone"; masters { 192.168.10.120 ; }; }; falko, Nov 26, 2008 #7 (You must log in or sign up to reply here.) Show Ignored Content Share This Page Tweet Log in with Facebook