Q. IXFR client behavior
Nobumichi Ozoe
Nobumichi.Ozoe at jp.yokogawa.com
Thu Jan 12 08:44:59 UTC 2006
Hi,
Now I'm trying to test Increment Zone Transfer (IXFR) using bind 9.3.2
as following enviroment. And I have a question about IXFR mechanizm on BIND9.
Q1. Why does an IXFR client make an IXFR query using TCP rather than UDP at first?
Q2. Why does an IXFR client ignore query response's SOA REFRESH time?
An IXFR server set 180sec as REFRESH time, but an IXFR client sends query
QTYPE=SOA every aroud 300sec.
(I put capture file at http://www.tahi.org/~ozoe/dns/ixfr_inclement.pcap)
Network
-------
IXFR client
|192.168.0.10
--+-----+-----
|
IXFR server
192.168.0.30
named.conf on IXFR server
-------------------
options {
directory "/etc/namedb";
provide-ixfr yes;
ixfr-from-differences yes;
notify no;
dump-file "s/named_dump.db";
};
zone "sec.example.com" {
type master;
file "sec.example.com";
};
named.conf on IXFR client
--------------------------
options {
directory "/etc/namedb";
request-ixfr yes;
notify no;
dump-file "s/named_dump.db";
};
zone "sec.example.com" {
type slave;
masters {192.168.0.30;};
file "s/sec.example.com";
};
sec.example.com zone file on IXFR server
-----------------------------------------
$TTL 86400; TTL of 30 sec
@ IN SOA NS7.sec.example.com. root.sec.example.com. (
1 ; Serial
180 ; Refresh
30 ; Retry
360 ; Expire
30 ; Minimum
)
IN NS NS7.sec.example.com.
IN NS NS1.sec.example.com.
IN MX 10 NS7
NS7 IN A 192.168.0.31
IN AAAA 3ffe:501:ffff:100::31
NS1 IN A 192.168.0.10
IN AAAA 3ffe:501:ffff:100::10
CL1 IN A 192.168.0.20
CL2 IN A 192.168.0.21
Updated zone information file on IXFR server
--------------------------------------------
$TTL 86400; TTL of 30 sec
@ IN SOA NS7.sec.example.com. root.sec.example.com. (
2 ; Serial
180 ; Refresh
30 ; Retry
360 ; Expire
30 ; Minimum
)
IN NS NS7.sec.example.com.
IN NS NS1.sec.example.com.
IN MX 10 NS7
NS7 IN A 192.168.0.31
IN AAAA 3ffe:501:ffff:100::31
NS1 IN A 192.168.0.10
IN AAAA 3ffe:501:ffff:100::10
CL1 IN A 192.168.0.21
CL3 IN A 192.168.0.22
--
Nobumichi Ozoe
IPv6 Business
Network & Software Development Dept.
Yokogawa Electric Corporation
E-mail: Nobumichi.Ozoe at jp.yokogawa.com
URL: http://www.yokogawa.com/
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