Problem with A record

[Mark_Andrews at isc.org]

> 
> Hi,
> 
> I have a strange problem. I have a linux server(slack 7.1,2.2.13) with
> two eth card one configured on the internal LAN and another on a
> public LAN.
> From the console if i try to ping to a domain i obtain:
> unknown host www.domain.com.
> But if i try to ask to my dns with nslookup everythings works. 

	Well ping uses the whatever name resolution services
	(/etc/hosts, NIS, DNS etc.) that you have told the system
	to use.

	nslookup talks directly to the DNS using whatever servers
	are configured in /etc/resolv.conf or 127.0.0.1/0.0.0.0
	if it doesn't exist.

> 
> If I set on a workstation on the private LAN the private IP addresse
> of the server the workstation is able to browse.
> 
> Sendmail cannot work 'cause it said "Sender domain must resolve".

	Well what were the names involved?

> 
> On the another machine with Slack 7.1, but kernel 2.2.19 everithings
> works. But I don't think kernel should be the problem.
> 
> This is my named.conf:
> 
> 
> options {
> directory "/igs/dns";
> # listen-on { !localnets; !localhost; any; }; # Non Funziona !!!
> listen-on { !localnets; any; };

	Well it would help is named was allowed to listen to
	any interfaces on this box.

> /*
> * If there is a firewall between you and nameservers you want
> * to talk to, you might need to uncomment the query-source
> * directive below. Previous versions of BIND always asked
> * questions using port 53, but BIND 8.1 uses an unprivileged
> * port by default.
> */
> // query-source address * port 53;
> forwarders { 192.106.1.1; };
> };
> 
> logging {
> category queries { default_syslog; };
> category cname { null; };
> category lame-servers { null; };
> };
> 
> zone "." {
> type hint;
> file "db.root";
> };
> 
> zone "0.0.127.in-addr.arpa" {
> type master;
> file "localhost.arpa";
> };

	You don't have a reverse zone covering your private lan.

> 
> This is my localhost.arpa:
> 
> 
> @ IN SOA igs.igs.it. root.igs.it. (
> 1999010100 ;serial
> 86400 ;refresh 8 h.
> 7200 ;retry 2 h.
> 604800 ;expire 7 g.
> 86400 ;minimum 1 g.
> )
> 
> IN NS localhost.
> 1 IN PTR localhost.igs.it.
> 
> This is my db.root:
> 
> A.ROOT-SERVERS.NET. IN A 198.41.0.4
> B.ROOT-SERVERS.NET. IN A 128.9.0.107
> C.ROOT-SERVERS.NET. IN A 192.33.4.12
> D.ROOT-SERVERS.NET. IN A 128.8.10.90
> E.ROOT-SERVERS.NET. IN A 192.203.230.10
> F.ROOT-SERVERS.NET. IN A 39.13.229.241
> G.ROOT-SERVERS.NET. IN A 192.112.36.4
> H.ROOT-SERVERS.NET. IN A 128.63.2.53
> I.ROOT-SERVERS.NET. IN A 192.36.148.17
> L.ROOT-SERVERS.NET. IN A 131.114.192.100
> M.ROOT-SERVERS.NET. IN A 131.154.2.3
> N.ROOT-SERVERS.NET. IN A 192.5.25.5
> O.ROOT-SERVERS.NET. IN A 38.8.50.2
> P.ROOT-SERVERS.NET. IN A 131.175.88.253
> 
> 
> 
> Any help would be appraciated.
> 
> Thank for your attention
> 
> 
> Andrea
> 
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at isc.org