From owner-freebsd-hackers  Wed Aug 13 12:33:55 1997
Return-Path: <owner-freebsd-hackers>
Received: (from root@localhost)
          by hub.freebsd.org (8.8.5/8.8.5) id MAA22830
          for hackers-outgoing; Wed, 13 Aug 1997 12:33:55 -0700 (PDT)
Received: from plains.NoDak.edu (tinguely@plains.NoDak.edu [134.129.111.64])
          by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id MAA22774
          for <hackers@FreeBSD.ORG>; Wed, 13 Aug 1997 12:32:46 -0700 (PDT)
Received: (from tinguely@localhost)
	by plains.NoDak.edu (8.8.5/8.8.5) id OAA32627;
	Wed, 13 Aug 1997 14:31:22 -0500 (CDT)
Date: Wed, 13 Aug 1997 14:31:22 -0500 (CDT)
From: Mark Tinguely <tinguely@plains.NoDak.edu>
Message-Id: <199708131931.OAA32627@plains.NoDak.edu>
To: hackers@FreeBSD.ORG, mango@staff.communique.net
Subject: Re: maybe a bug ...
Sender: owner-freebsd-hackers@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

>  kiyoko:~$ ifconfig de0
>  de0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>          inet 10.4.64.11 netmask 0xffffff00 broadcast 255.255.255.0
>
>  and I did the following:
>  ifconfig de0 10.4.65.11 255.255.255.255 alias
>  .........some 3 hours of activity.......
>  ifconfig de0 10.4.65.11 255.255.255.255 delete
>
>  and then I tried to connect to 10.4.65.7.  I could not.
>
>  The details:
>
>  10.4.64.0/24--------ROUTER------10.4.65.0/24
>
>  I have a route on ROUTER '10.4.65.11 ---> 10.4.64.11'
>
>  netstat -nr show the expected routes, for example:
>  destination		GATEWAY
>  10.4.65.7		x:xx:xx:xx:xx:xx	bla bla
>
>  were x:xx:xx:xx:xx:xx was the ethernet address of ROUTER
>
>  tcpdump would show that this machine was still using 10.4.65.11 as the
>  source address, even though it was not defined in any of the interfaces.

I think you have an unresolved ARP request. Type:

$ arp -a

there should be a line that says:

HOST.DOMAIN (IP.IP.IP.IP) at (incomplete)

if you delte the incomplete arp entry:

# arp -d IP.IP.IP.IP

you will see the 10.4.65.11 activity stop.

--mark.

ps. you may also want to delete the permanent arp entry for the alias IP when
    you shut the alias down.