Copyright (C) 2001  Internet Software Consortium.See COPYRIGHT in the source root or http://isc.org/copyright.html for terms.$Id: migration-4to9,v 1.3 2001/05/19 01:20:16 gson Exp $		   BIND 4 to BIND 9 Migration NotesTo transition from BIND 4 to BIND 9 you first need to convert yourconfiguration file to the new format.  There is a conversion tool incontrib/named-bootconf that allows you to do this.	named-bootconf.sh < /etc/named.boot > /etc/named.confBIND 9 uses a system assigned port for the UDP queries it makes ratherthan port 53 that BIND 4 uses.  This may conflict with some firewalls.The following directives in /etc/named.conf allows you to specifya port to use.	query-source address * port 53;	transfer-source * port 53;	notify-source * port 53;BIND 9 no longer uses the minimum field to specify the TTL of recordswithout a explicit TTL.  Use the $TTL directive to specify a default TTLbefore the first record without a explicit TTL.	$TTL 3600	@	IN	SOA	ns1.example.com. hostmaster.example.com. (				2001021100				7200				1200				3600000				7200 )BIND 9 does not support multiple CNAMEs with the same owner name.		Illegal:	www.example.com. CNAME host1.example.com.	www.example.com. CNAME host2.example.com.BIND 9 does not support "CNAMEs with other data" with the same owner name,ignoring the DNSSEC records (SIG, NXT, KEY) that BIND 4 did not support.	Illegal:	www.example.com. CNAME host1.example.com.	www.example.com. MX 10 host2.example.com.BIND 9 is less tolerant of errors in master files, so check your logs andfix any errors reported.  The named-checkzone program can also be to checkmaster files.Outgoing zone transfers now use the "many-answers" format by default.This format is not understood by certain old versions of BIND 4.  You can work around this problem using the option "transfer-formatone-answer;", but since these old versions all have known securityproblems, the correct fix is to upgrade the slave servers.