arp -a takes 40 secs to display cached MAC addresses. Is thisnormal?

[Matt Emmerton]

----- Original Message ----- 
From: "boink" <lordboink at gmail.com>
To: <freebsd-questions at freebsd.org>
Sent: Monday, April 03, 2006 6:06 PM
Subject: arp -a takes 40 secs to display cached MAC addresses. Is
thisnormal?


Dear FreeBSD,

# uname -a
FreeBSD MyFBSD.int.vir 6.0-RELEASE FreeBSD 6.0-RELEASE #0: Thu Nov  3
09:36:13 UTC 2005
root at x64.samsco.home:/usr/obj/usr/src/sys/GENERIC  i386

# /usr/bin/time -h arp -a
MyFBSD (10.1.2.1) at 00:00:f8:10:6c:8a on dc0 permanent [ethernet]
MyFirewall (10.1.2.254) at 00:0d:b9:11:a5:b9 on dc0 [ethernet]
? (10.1.2.255) at ff:ff:ff:ff:ff:ff on dc0 permanent [ethernet]
        40.22s real             0.00s user              0.00s sys
           ^
...where:

----

arp is attempting to do a reverse-DNS lookup on 10.1.2.255.  No answer is
received from your DNS server in the allowable time-out interval, so it
displays the name as '?'.

Redo the same test using 'arp -a -n' and you'll see it complete immediately.

--
Matt Emmerton