Ironic.
When I was whipping up that original email, I had put
10.0.0.0/24 and 10.0.1.0/24, but I knew someone would call
me on the contiguous network thing, and I didn't feel like
explaining that too, so I switched it to 172.16.0.0/24.
=)
: -----Original Message-----
: From: Rampley, Jim [mailto:[EMAIL PROTECTED]]
: Sent: Thursday, July 06, 2000 2:09 PM
: To: 'Diegmueller, Jason (I.T. Dept)'; '[EMAIL PROTECTED]';
: '[EMAIL PROTECTED]'
: Subject: RE: Secondary IP address
:
:
:
: I just recently was called out to a customer site who was
: complaining that
: while they were using Norton Ghost sometimes they would get
: great throughput
: and other times it would be dog slow. The workstation being
: ghosted was
: plugged into a switch port at 100 full on a cat 5000 and the
: server was
: plugged into the same switch at 100 full. The problem was
: they are using
: secondary addresses so the traffic must bounce off the Cisco
: 3640 to and
: from the server were the images are. The workstation would
: DHCP an address
: on one of the other subnets. I had them set a static address
: on the same
: subnet that the server was on and we would get 5 times the
: throughput. The
: ghosting went from taking over an hour to about 5 minutes.
:
: Since the addresses are already contiguous we are planning on
: changing the
: subnet mask in an upcoming project so it's all the same address space.
:
: Jim
:
: -----Original Message-----
: From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
: Diegmueller, Jason (I.T. Dept)
: Sent: Thursday, July 06, 2000 1:06 PM
: To: '[EMAIL PROTECTED]'; [EMAIL PROTECTED]
: Subject: RE: Secondary IP address
:
:
: : What are the advantages of using a secondary IP on and
: : ethernet interface
:
: Advantage? Other then the fact it can be used to "patch together"
: two networks in a bind, none. It can be considered harmful for
: performance. Imagine:
:
: Router: 10.0.0.1/24, and 172.16.0.1/24 secondary
: Host A: 10.0.0.2/24
: Host B: 172.16.0.2/24
:
: Both hosts and the router are going to a single hub. Host A needs
: to communicate with Host B. By utilizing it's IP and subnet mask,
: Host A determines Host B is NOT on it's local network and thus
: sends the packet to it's default gateway (the router).
:
: The router, having the secondary address, knows that the destination
: network (172.16.0.0/24) is actually on the same interface it just
: received the packet from. So it ends up ARPing for Host B and
: reencapsulating the packet right back out the same interface it just
: came in from.
:
: All return communication by Host B must go along the same
: path (Router-->
: Host A) even though they are technically on the same wire.
:
: Obviously, you would never want to design a network like this from the
: ground up, but it's sometimes necessary until you're able to
: readdress,
: redesign, or whatever the case may call for.
:
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