<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=windows-1252">
<META NAME="Generator" CONTENT="MS Exchange Server version 5.5.2448.0">
<TITLE>RE: [NTLUG:Discuss] Multiple IP's on a NIC</TITLE>
</HEAD>
<BODY>
<P><FONT SIZE=2>Well, when I try that, I get the same net effect as before: if I issue ifup eth0:0 I get an alias ip for eth0. However, if I issue ifdown eth0:0 it takes down the NIC itself! If possible, I would like to be able to add/delete alias ip's "on the fly."</FONT></P>
<P><FONT SIZE=2>Try it for yourself. Just be sure you don't have a problem rebooting, because so far that is what I have had to do to get rid of unwanted aliases!</FONT></P>
<P><FONT SIZE=2>Gregory L. Camp</FONT>
<BR><FONT SIZE=2>Gregory.Camp@osc.com</FONT>
</P>
<BR>
<P><FONT SIZE=2>> -----Original Message-----</FONT>
<BR><FONT SIZE=2>> From: James L. Skidmore [<A HREF="mailto:james@linux-guy.com">mailto:james@linux-guy.com</A>]</FONT>
<BR><FONT SIZE=2>> Sent: Friday, September 29, 2000 12:03 PM</FONT>
<BR><FONT SIZE=2>> To: 'discuss@ntlug.org'</FONT>
<BR><FONT SIZE=2>> Subject: RE: [NTLUG:Discuss] Multiple IP's on a NIC</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> That's no problem :-)</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> Redhat sets the NIC's in /etc/sysconfig/network-scripts/</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> In that directory, you should find at least ifcfg-eth0 and possibly</FONT>
<BR><FONT SIZE=2>> ifcfg-eth1 if you have set up two NIC's.</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> copy the ifcfg-eth0 to ifcfg-eth0:0 (eth0:1, etc.) and change the IP</FONT>
<BR><FONT SIZE=2>> address/network addr/broadcast addr - etc.</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> You can then use /etc/rc.d/init.d/network </FONT>
<BR><FONT SIZE=2>> (stop|start|restart) to bring</FONT>
<BR><FONT SIZE=2>> up/take down/ restart all of the interfaces.</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> ifup eth0 to bring the interface up</FONT>
<BR><FONT SIZE=2>> ifdown eth0 to bring down the interface</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> and of course you can still use ifconfig</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> Hope this helps</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> ============================================================</FONT>
<BR><FONT SIZE=2>> James L. Skidmore james@linux-guy.com</FONT>
<BR><FONT SIZE=2>> <A HREF="http://linux-guy.com" TARGET="_blank">http://linux-guy.com</A> helpline: metro 817-516-7170</FONT>
<BR><FONT SIZE=2>> Linux - Consulting - Training - Security - Networks</FONT>
<BR><FONT SIZE=2>> ============================================================</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> > > On Fri, 29 Sep 2000, Gregory L. Camp wrote:</FONT>
<BR><FONT SIZE=2>> > > </FONT>
<BR><FONT SIZE=2>> > > > Currently I'm using the command string "ifconfig eth0:0 </FONT>
<BR><FONT SIZE=2>> 192.168.1.1</FONT>
<BR><FONT SIZE=2>> > > > broadcast 192.168.1.255 netmask 255.255.255.0 up" to add </FONT>
<BR><FONT SIZE=2>> > > secondary, and</FONT>
<BR><FONT SIZE=2>> > > > sometimes tertiary, ip's to a NIC.</FONT>
<BR><FONT SIZE=2>> > > > </FONT>
<BR><FONT SIZE=2>> > > > Here's my two questions: Is this the best way to do this? </FONT>
<BR><FONT SIZE=2>> > > and Is there a way</FONT>
<BR><FONT SIZE=2>> > > > to remove a secondary ip without taking down the entire NIC?</FONT>
<BR><FONT SIZE=2>> > > > </FONT>
<BR><FONT SIZE=2>> > > > TIA. </FONT>
<BR><FONT SIZE=2>> > > > </FONT>
<BR><FONT SIZE=2>> > > > Gregory L. Camp</FONT>
<BR><FONT SIZE=2>> > > > Gregory.Camp@osc.com</FONT>
<BR><FONT SIZE=2>> > </FONT>
<BR><FONT SIZE=2>> > --</FONT>
<BR><FONT SIZE=2>> > OSC, a subsidiary of Billing Concepts Corp., a NASDAQ </FONT>
<BR><FONT SIZE=2>> listed Company,</FONT>
<BR><FONT SIZE=2>> > Symbol: "BILL"</FONT>
<BR><FONT SIZE=2>> > </FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> _______________________________________________</FONT>
<BR><FONT SIZE=2>> <A HREF="http://ntlug.org/mailman/listinfo/discuss" TARGET="_blank">http://ntlug.org/mailman/listinfo/discuss</A></FONT>
<BR><FONT SIZE=2>> </FONT>
</P>
<P><FONT SIZE=2>--</FONT>
<BR><FONT SIZE=2>OSC, a subsidiary of Billing Concepts Corp., a NASDAQ listed Company, Symbol: "BILL"</FONT>
</P>
</BODY>
</HTML>