Re: Ethernet Card and IP Addresses...

["Oludare" <oludare@xxxxxxxxxxxxx>]

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
> >
> > --
> >
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