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From: John Capo <jc@irbs.com>
Message-Id: <199505161609.MAA02043@irbs.irbs.com>
Subject: Re: "arp info overwritten" problem
To: graichen@sirius.physik.fu-berlin.de (Thomas Graichen)
Date: Tue, 16 May 1995 12:09:05 -0400 (EDT)
Cc: freebsd-hackers@freefall.cdrom.com (freebsd-hackers)
In-Reply-To: <9505161422.AA16140@sirius.physik.fu-berlin.de> from "Thomas Graichen" at May 16, 95 04:22:44 pm
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Thomas Graichen writes:
> 
> hello
> 
> again a problem:
> 
> here i often get the "arp info overwritten for 130.133.255.255 from ..." -
> aroud every 1/4 i get this and i think it's because FreeBSD keeps the
> broadcast adress in his arp cache -> arp -a looks like:
> 
> graichen@julia:~> arp -a
> di_2_zedat.zedat.fu-berlin.de (130.133.1.31) at 8:0:25:20:2:c6
> fub46.zedat.fu-berlin.de (130.133.1.46) at 0:0:77:2:11:50
> axp1.physik.fu-berlin.de (130.133.3.45) at 8:0:2b:3e:d8:94
> axp3.physik.fu-berlin.de (130.133.3.48) at 8:0:2b:3c:58:ae
> omega.physik.fu-berlin.de (130.133.3.51) at 8:0:2b:33:8f:8d
> sirius.physik.fu-berlin.de (130.133.3.140) at 8:0:2b:3b:dd:78
> lucy.physik.fu-berlin.de (130.133.3.186) at 0:0:c0:a2:40:6a
> julia.physik.fu-berlin.de (130.133.3.235) at 0:0:c0:7c:79:a4 permanent
> leibniz.math.fu-berlin.de (130.133.4.10) at 8:0:20:c:29:d1
> heiss.router.fu-berlin.de (130.133.97.5) at 0:0:c:15:e7:fd
> lion.chemie.fu-berlin.de (130.133.210.165) at 8:0:9:28:3:f
> BROADCAST.fu-berlin.de (130.133.255.255) at 8:0:14:15:16:78
> graichen@julia:~>
> 
> i think the last entry should not be there (BROADCAST.fu-berlin.de) is only an
> entry in the nameserver for the broadcast-adress - it's not a machine) - i
> think there seems to be something worng with the arp cache - if you need any
> more info - please mail me - the system is correctly configured and the
> network too - t

BROADCAST.fu-berlin.de is a machine, it has an A record.

[ns.nic.de]
 fu-berlin.de.                  SOA   fub46.zedat.fu-berlin.de hostmaster.zedat.
fu-berlin.de. (20000769 10800 3600 432000 86400)
...
 physiologie                    CNAME vaxser.grumed.fu-berlin.de
 BROADCAST                      A     130.133.255.255
...

I have a route to it.

irbs 2% netstat -ra
Routing tables

Internet:
Destination      Gateway            Flags     Refs     Use     Netif Expire
default          popeye.davsys.com  UGc         6    10835      tun0
localhost        localhost          UH          1      470       lo0
...
phakir.zedat.fu- popeye.davsys.com  UGHW3       0    10836      tun0    263
BROADCAST.fu-ber popeye.davsys.com  UGHW3       0    10837      tun0    288
...

I am not a DNS expert but I would bet money this A record is bogus
and should be deleted.  Its not a FreeBSD problem.

John Capo