Subject: Re: Unexpected AAAA queries
To: Thomas Seeger <news@seegerinvest.de>
From: None <itojun@iijlab.net>
List: tech-net
Date: 07/09/2003 06:05:27
>While using NetBSD on an i386 machine I experience large delays in
>http/ftp/etc. connections:
>
>paul: {1} time finger @www.netbsd.org
>finger: connect: Connection refused
>0.0u 0.0s 1:15.26 0.0% 0+0k 0+4io 0pf+0w
>
>tcpdump: listening on ne0
>21:16:17.423040 arp who-has bummi tell paul.home
>21:16:17.423581 arp reply bummi is-at 0:c0:26:e1:3c:4f
>21:16:17.423599 paul.home.65512 > bummi.domain:  27239+ AAAA?
>www.netbsd.org. (32)
>21:16:17.802165 paul.home.65511 > bummi.domain:  9394+ PTR?
>2.1.168.192.in-addr.arpa. (42)
>21:16:17.804043 bummi.domain > paul.home.65511:  9394* 1/0/0 (85)
>21:16:22.430048 paul.home.65510 > bummi.domain:  27239+ AAAA?
>www.netbsd.org. (32)

	you have a bad nameserver at bummi, or bummi's upstream foodchain,
	which is the cause of the delay.
	bummi should have returned AAAA record for www.netbsd.org, as there's
	AAAA record for www.netbsd.org.

itojun


; <<>> DiG 9.2.2 <<>> www.netbsd.org. aaaa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55861
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 7, ADDITIONAL: 1

;; QUESTION SECTION:
;www.netbsd.org.			IN	AAAA

;; ANSWER SECTION:
www.netbsd.org.		30552	IN	AAAA	2001:4f8:4:b:290:27ff:feab:19a7

;; AUTHORITY SECTION:
netbsd.org.		62355	IN	NS	ns2.berkeley.edu.
netbsd.org.		62355	IN	NS	adns1.berkeley.edu.
netbsd.org.		62355	IN	NS	adns2.berkeley.edu.
netbsd.org.		62355	IN	NS	uucp-gw-1.pa.dec.com.
netbsd.org.		62355	IN	NS	uucp-gw-2.pa.dec.com.
netbsd.org.		62355	IN	NS	ns.netbsd.org.
netbsd.org.		62355	IN	NS	ns1.berkeley.edu.

;; ADDITIONAL SECTION:
ns.netbsd.org.		62355	IN	A	155.53.1.253

;; Query time: 51 msec
;; SERVER: 202.232.15.98#53(202.232.15.98)
;; WHEN: Wed Jul  9 06:05:13 2003
;; MSG SIZE  rcvd: 239