Actually using secondaries and DHCP should be a non issue with any reasonable DHCP server platform. As you mention, in many versions of IOS the interface's primary IP address is used as the DHCP giaddr. If an interface has multiple secondaries, one just needs to configure the DHCP server to be aware that there are multiple scopes associated with the giaddr.
The use of secondaries and the DHCP server logic to understand what scopes are associated with an interface is a useful feature when one might need to renumber users from one subnet to another. Or if one runs out of IP addresses on an existing subnet, one can simply add on a secondary subnet onto the interface and DHCP server without causing everyone to be renumbered. Darren S. Crawford wrote: > > Secondarys will really hurt you in a DHCP environment. The > workstations on > the secondary subnet will get their DHCP request forwarded with > a source > segment of the initial IP address on the interface. This was > good ammo for > me when I was in the same boat. > > HTH > > Darren > > At 10:52 PM 12/3/2002 +0000, Edward Sohn wrote: > >Thanks to all for the responses to my VPN connections. > > I have pretty much verified it will work in an > >"active/failover" setting... > > > >Now, I have an issue where I need to convince my > >customer that it's better to subinterface a fast > >ethernet port into two separate VLANs rather than add > >secondary IP addressing on the router. > > > >Now, from my understanding I thought that secondary IP > >addressing is "traditionally" not recommended. I > >thought I read somewhere that it creates instability > >for both networks and increases traffic. Now, I'm not > >certain, so correct me if I'm wrong. > > > >Thanks, > > > >Ed > > > >__________________________________________________ > >Do you Yahoo!? > >Yahoo! Mail Plus - Powerful. Affordable. Sign up now. > >http://mailplus.yahoo.com > +++++++++++++++++++++++++++++++++ > International Network Services > Darren S. Crawford - CCNP, CCDP, CISSP > Sr. Network Systems Consultant > Northwest Region - Sacramento Office > Voicemail (916) 859-5200 x310 > Pager (800) 467-1467 > mailto:[EMAIL PROTECTED] > +++++++++++++++++++++++++++++++++ > > Every Job is a Self-Portrait of the person Who Did > It...Autograph Your Work With EXCELLENCE! > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=58507&t=58498 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
