Re: Ethernet Card and IP Addresses...

[Philipp Rusch <Philipp.Rusch@xxxxxxxxxxxx>]

Hello Dare,
an excellent source of eduction for all kind of networking (mostly IP)
questions is at www.cisco.com.
Most of the papers are available in the public and of outstanding quality.
HTH, Philipp Rusch

Oludare schrieb:

> Thanks Philip,
>
> The system I'm administering is configured this way and I need the
> education.  This same system I think is using SNA for some of its APPs on
> the client and I'm trying to understand the entire environment.
>
> Dare
>
> ----- Original Message -----
> From: "Philipp Rusch" <Philipp.Rusch@rusch-edv.de>
> To: <midrange-l@midrange.com>
> Sent: Wednesday, December 05, 2001 4:54 PM
> Subject: Re: Ethernet Card and IP Addresses...
>
> > Answers inline, but first a question: what are you trying to accomplish ?
> >
> > Oludare schrieb:
> >
> > > Hi guys,
> > >
> > > I have the following questions:
> > >
> > > How do you setup several IP addresses with 1 Ethernet card?
> >
> > This is called multi-homing and the AS/400 is perfect in that, just CFGTCP
> > hit 1 to add another IP-interface to the line you are using.
> >
> > >
> > > What are the benefits or why would one want to do this?
> >
> > Benefits arise when you (for instance) need to "more than one" server,
> webserving
> > comes to my mind where you would need several "virtual servers"
> (instances)
> > to serve different tasks (I am no web-Programmer) and need to bind each
> instance
> > to a different IP-address (this is quite common), or your network design
> needs your
> > machine to be seen from different IP-schemes, although this is physically
> one LAN
> > connection only (migrating from one adressing-scheme to another would be
> no pain
> > with this aproach ...)
> >
> > >
> > > Are there any disadvantage(s)?
> >
> > There are routing issues, especially if using windows clients which often
> depend
> > on a so called "default gateway" and of course this "costs" a little bit
> of horse power.
> >
> > >
> > > Are all the IPs function at the same level or used equally?
> >
> > If you don't depend on a single "default gateway" they are all equal.
> >
> > >
> > > Can all the IPs have one name?
> >
> > Yes, but not through a HOSTS table, where this is impossible (the first
> entry counts)
> > but with a DNS-Server setup this should be no problem.
> > Normally this is used the other way round: if you'd have more then one
> Ethernet card
> > you could use them "load balanced" in the way that each (different)
> IP-address of these
> > interfeaces is noted under the *same* name in your DNS server. DNS is
> prepared to do
> > a so called "round robin" routine to switch to the next address for the
> same host each time
> > a new request is coming in. Simple, but powerful, take a look at
> www.ibm.com, this site
> > consists at least of four different servers (ip-adresses) but all share
> the same DNS-name.
> >
> > >
> > >
> > > I know of some other question but I will start from here and thanks for
> your input.
> > >
> >
> > Just ask, we will try to answer... :-)
> >
> > Regards from germany, Philipp Rusch
> >
> > >
> > > Dare
> > >
> > > --
> > >
> > > _______________________________________________
> > > This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing
> list
> > > To post a message email: MIDRANGE-L@midrange.com
> > > To subscribe, unsubscribe, or change list options,
> > > visit: http://lists.midrange.com/cgi-bin/listinfo/midrange-l
> > > or email: MIDRANGE-L-request@midrange.com
> > > Before posting, please take a moment to review the archives
> > > at http://archive.midrange.com/midrange-l.
> >
> > _______________________________________________
> > This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing
> list
> > To post a message email: MIDRANGE-L@midrange.com
> > To subscribe, unsubscribe, or change list options,
> > visit: http://lists.midrange.com/cgi-bin/listinfo/midrange-l
> > or email: MIDRANGE-L-request@midrange.com
> > Before posting, please take a moment to review the archives
> > at http://archive.midrange.com/midrange-l.
> >
>
> _______________________________________________
> This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list
> To post a message email: MIDRANGE-L@midrange.com
> To subscribe, unsubscribe, or change list options,
> visit: http://lists.midrange.com/cgi-bin/listinfo/midrange-l
> or email: MIDRANGE-L-request@midrange.com
> Before posting, please take a moment to review the archives
> at http://archive.midrange.com/midrange-l.