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category config { default_syslog; security_log; }; category security { default_syslog; security_log; }; category dnssec { default_syslog; security_log; }; }; options { directory "/"; pid-file "/var/run/named.pid"; version "[null]"; allow-transfer { transfer; }; blackhole { bad_source; }; query-source address * port 53; }; view "external" IN { match-clients { any; }; recursion no; zone "yourdomain.com" { type master; file "/master/db.yourdomain.com"; }; zone "anotherdomain.com" { type master; file "/master/db.anotherdomain.com"; }; }; view "chaosnet" chaos { match-clients { any; }; recursion no; zone "bind" chaos { type master; file "/master/db.bind"; allow-transfer { none; }; }; };

The named.conf file in Listing B-3 is for a split DNS name server that is designed to be deployed in your DMZ in order to provide answers to DNS queries from both internal and external clients for the domains for which it is authoritative. It also allows recursion for your internal clients. It is authoritative for two domains: yourdomain.com and anotherdomain.com. You will need to replace the zone statements with statements applicable to your domains.

You will need to specify details of any slave servers in the transfer acl statement. I recommend also adding TSIG security for any zone transfers. You will also need to specify any IP addresses or networks you would like to block with the blackhole option. I recommend adding the bad source networks listed in 2. I have included extensive logging to the syslog daemon, and I have also added a log file, named_sec.log, as an additional repository to hold your security-, configuration-, and DNSSEC/TSIG-related logs. Listing B-3. named.conf, Split DNS acl "trusted" { //specify your trusted network here }; acl "transfer" { //specify your slave servers here }; acl "bad_source" { //specify any sources you wish to blackhole here }; logging { channel "default_syslog" { syslog daemon; severity info; }; channel "security_log" { file "/var/logs/named_sec.log" versions 30 size 1m; severity dynamic; print-time yes; print-category yes; print-severity yes; }; category category category category category category category category category }; default { default_syslog; }; general { default_syslog; }; xfer-in { default_syslog; }; xfer-out { default_syslog; }; client { default_syslog; }; network { default_syslog; }; config { default_syslog; security_log; }; security { default_syslog; security_log; }; dnssec { default_syslog; security_log; };

For example, if the thread pool detects that many threads have an I/O bottleneck, it will create additional threads to complete the work more quickly The thread pool contains a background thread that checks every 05 seconds to see whether any work has been completed If no work has been done (and there is more work to do), a new thread will be created to perform this work Each worker thread picks up tasks from the global queue and moves it onto its local queue for execution Each worker thread processes the tasks on its queue If a thread finishes all the work in its local queue, it steals work from other queues to ensure that work is processed as quickly as possible.

options { directory "/"; pid-file "/var/run/named.pid"; version "[null]"; recursion no; allow-recursion { none; };

allow-transfer { transfer; }; blackhole { bad_source; }; query-source address * port 53; }; view "internal" IN { match-clients { trusted; }; recursion yes; zone "." { type hint; file "/master/db.cache"; }; zone "localhost" { type master; file "/master/db.localhost"; notify no; allow-transfer { none; }; }; zone "0.0.127.in-addr.arpa" { type master; file "/master/db.127.0.0"; notify no; allow-transfer { none; }; }; zone "yourdomain.com" { type master; file "/master/db.yourdomain.com.internal"; }; zone "anotherdomain.com" { type master; file "/master/db.anotherdomain.com.internal"; }; }; view "external" IN { match-clients { any; }; recursion no; zone "yourdomain.com" { type master; file "/master/db.yourdomain.com.external"; };

zone "anotherdomain.com" { type master; file "/master/db.anotherdomain.com.external"; }; }; view "chaosnet" chaos { match-clients { any; }; recursion no; zone "bind" chaos { type master; file "/master/db.bind"; allow-transfer { none; }; }; };

Note that tasks will steal work from the end of the other task s queues to minimize the chance that the task has started operating with the work already Figure 5-3 demonstrates this process..