Re: Ethernet Card and IP Addresses...

[Philipp Rusch <Philipp.Rusch@xxxxxxxxxxxx>]

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.