Date: Mon, 20 Dec 1999 10:33:45 -0500 From: "N.B. DelMore" <mylists@inr.net> To: freebsd-questions@FreeBSD.ORG Subject: Re: Assigning Info Message-ID: <3.0.6.32.19991220103345.00a26670@mail.inr.net> In-Reply-To: <4.2.0.58.19991216002113.00b19a90@mail.enterit.com> References: <000701bf484c$aeeac8c0$0300a8c0@Desktop>
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At 12:21 AM 12/16/1999 -0500, you wrote:
> ifconfig device < that is the same thing as 255.255.255.255
OK .. dumb question, what if your address space is sub-netted, for example,
we often use a /25 (255.255.255.128).
Also, in BSDI they use the following in /etc/netstat to configure virtual
IP addresses:
# Configure virtual hosts defined in /etc/virtualip
# /etc/virtualip contains a list of IP addresses to configure.
# We lookup the link address (if any) and arp for them if we
# can; otherwise we just add them as an IP alias on the loopback.
if [ -f /etc/virtualip ]; then
/usr/libexec/linkaddr `cat /etc/virtualip` 2>/dev/null | \
while read line; do
set -- $line # virtualip [linkaddr]
ifconfig lo0 add $1
if [ "$2" ]; then arp -s $1 $2 pub; fi
done
fi
I haven't seen anything in freebsd equivalent, the nice thing about this
implimentation is it is very easy to add IP addresses if you've forgotten
to add it beforehand, i.e.
#!/bin/sh
# Let's make life easy and save some keystrokes by defining some variables
IP=$1
NETMASK=$2
# Test to see if both the IP address and netmask was entered on the command
line
# otherwise show proper usage.
if [ $# -ne 2 ];then
echo
echo "usage: vip <ip> <netmask>"
echo
exit 0
fi
/sbin/ifconfig lo0 add $1 $2
/usr/sbin/arp -s `/usr/libexec/linkaddr $1` pub
echo $1 >> /etc/virtualip
echo "$1 added to /etc/virtualip"
Regards
Noel
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