What happens if you have 2 (or more) computers, with 2 NICs each and assign
different IP addresses/ranges to corresponding NICs? For example:

Computer 1:
NIC 1: 192.168.1.2 Netmask: 255.255.255.0
NIC 2: 192.168.100.2 Netmask: 255.255.255.0

Computer 2:
NIC 1:192.168.1.3 Netmask: 255.255.255.0
NIC 2:192.168.100.3 Netmask: 255.255.255.0

The computers would be connected by one or two routers. If two routers, one
for the 192.168.1.xxx NICs, and one for the 192.168.100.xxx NICs (would it
matter if 1 or 2?)
Or, would be connected by two crossover cables - one on 192.168.1.xxx NICs,
one on 192.168.100.xxx NICs.

Presumably the Workgroup is the same as there can only be one Workgroup
assigned to the computer, right?

What if using 2 router(s) and they both have a WAN / Internet connection?
Which router / address range will be providing internet access to each
computer? Will it be one or the other only or can it be both for possibly
higher bandwidth?

This isn't homework and it isn't a particular problem I'm trying to solve.
I'm wanting to learn about what happens in a situation like this - motivated
by a question I tried to answer recently.

Thanks,

Fred

In <ho-dnRo2P9fJB2fcRVn-(E-Mail Removed)>, "Fred Marshall" <fmarshallx@remove_the_x.acm.org> writes:
>What happens if you have 2 (or more) computers, with 2 NICs each and assign
>different IP addresses/ranges to corresponding NICs? For example:
>
>Computer 1:
>NIC 1: 192.168.1.2 Netmask: 255.255.255.0
>NIC 2: 192.168.100.2 Netmask: 255.255.255.0
>
>Computer 2:
>NIC 1:192.168.1.3 Netmask: 255.255.255.0
>NIC 2:192.168.100.3 Netmask: 255.255.255.0
>
>The computers would be connected by one or two routers. If two routers, one
>for the 192.168.1.xxx NICs, and one for the 192.168.100.xxx NICs (would it
>matter if 1 or 2?)
>Or, would be connected by two crossover cables - one on 192.168.1.xxx NICs,
>one on 192.168.100.xxx NICs.
>
>Presumably the Workgroup is the same as there can only be one Workgroup
>assigned to the computer, right?
>
>What if using 2 router(s) and they both have a WAN / Internet connection?
>Which router / address range will be providing internet access to each
>computer? Will it be one or the other only or can it be both for possibly
>higher bandwidth?
>
>This isn't homework and it isn't a particular problem I'm trying to solve.
>I'm wanting to learn about what happens in a situation like this - motivated
>by a question I tried to answer recently.


Firstly you are confusing Workgroup with TCP/IP. Workgroup is a
throwback to NetBios on Win 3.1. It has nothing to do with Internet
communication.

If you have in mind a rationale for the configurations you are
describing, then there is probably a better solution.

<(E-Mail Removed)> wrote in message
news:c1.2c.2vNbFM$(E-Mail Removed)...
> In <ho-dnRo2P9fJB2fcRVn-(E-Mail Removed)>, "Fred Marshall"
> <fmarshallx@remove_the_x.acm.org> writes:
>>What happens if you have 2 (or more) computers, with 2 NICs each and
>>assign
>>different IP addresses/ranges to corresponding NICs? For example:
>>
>>Computer 1:
>>NIC 1: 192.168.1.2 Netmask: 255.255.255.0
>>NIC 2: 192.168.100.2 Netmask: 255.255.255.0
>>
>>Computer 2:
>>NIC 1:192.168.1.3 Netmask: 255.255.255.0
>>NIC 2:192.168.100.3 Netmask: 255.255.255.0
>>
>>The computers would be connected by one or two routers. If two routers,
>>one
>>for the 192.168.1.xxx NICs, and one for the 192.168.100.xxx NICs (would it
>>matter if 1 or 2?)
>>Or, would be connected by two crossover cables - one on 192.168.1.xxx
>>NICs,
>>one on 192.168.100.xxx NICs.
>>
>>Presumably the Workgroup is the same as there can only be one Workgroup
>>assigned to the computer, right?
>>
>>What if using 2 router(s) and they both have a WAN / Internet connection?
>>Which router / address range will be providing internet access to each
>>computer? Will it be one or the other only or can it be both for possibly
>>higher bandwidth?
>>
>>This isn't homework and it isn't a particular problem I'm trying to solve.
>>I'm wanting to learn about what happens in a situation like this -
>>motivated
>>by a question I tried to answer recently.
>
>
> Firstly you are confusing Workgroup with TCP/IP. Workgroup is a
> throwback to NetBios on Win 3.1. It has nothing to do with Internet
> communication.
>
> If you have in mind a rationale for the configurations you are
> describing, then there is probably a better solution.

John,

No, I'm not confusing Workgroups and TCP/IP. Whatever gave you that idea?
One is a Windows thing. The other isn't limited to just Windows -
obviously. I simply asked some questions. I've presumed that Windows only
supports one Workgroup because there appears to be but one setting per
computer - in that regard I only asked for confirmation.

Any answers?

Fred

"Fred Marshall" <fmarshallx@remove_the_x.acm.org> wrote in
news:ho-dnRo2P9fJB2fcRVn-(E-Mail Removed):

> Computer 1:
> NIC 1: 192.168.1.2 Netmask: 255.255.255.0
> NIC 2: 192.168.100.2 Netmask: 255.255.255.0
>
> Computer 2:
> NIC 1:192.168.1.3 Netmask: 255.255.255.0
> NIC 2:192.168.100.3 Netmask: 255.255.255.0
>
> [...]
> What if using 2 router(s) and they both have a WAN / Internet
> connection? Which router / address range will be providing
> internet access to each computer? Will it be one or the other
> only or can it be both for possibly higher bandwidth?
>

I think you'd find that any traffic going to the 192.168.1.x subnet
will go out the 192.168.1.x NIC and traffic going to the 192.168.100.x
subnet will go out the 192.168.100.x NIC. Traffic going anywhere else
will go out the NIC where the "default gateway" is defined, as the
default gateway must be on one of these two subnets. If more than one
gateway is defined, the first one is usually used unless it is not
working.

HTH,
John

In <p4udnUi3yOH3eGfcRVn-(E-Mail Removed)>, "Fred Marshall" <fmarshallx@remove_the_x.acm.org> writes:
><(E-Mail Removed)> wrote in message
>news:c1.2c.2vNbFM$(E-Mail Removed)...
>> In <ho-dnRo2P9fJB2fcRVn-(E-Mail Removed)>, "Fred Marshall"
>> <fmarshallx@remove_the_x.acm.org> writes:
>>>What happens if you have 2 (or more) computers, with 2 NICs each and
>>>assign
>>>different IP addresses/ranges to corresponding NICs? For example:
>>>
>>>Computer 1:
>>>NIC 1: 192.168.1.2 Netmask: 255.255.255.0
>>>NIC 2: 192.168.100.2 Netmask: 255.255.255.0
>>>
>>>Computer 2:
>>>NIC 1:192.168.1.3 Netmask: 255.255.255.0
>>>NIC 2:192.168.100.3 Netmask: 255.255.255.0
>>>
>>>The computers would be connected by one or two routers. If two routers,
>>>one
>>>for the 192.168.1.xxx NICs, and one for the 192.168.100.xxx NICs (would it
>>>matter if 1 or 2?)
>>>Or, would be connected by two crossover cables - one on 192.168.1.xxx
>>>NICs,
>>>one on 192.168.100.xxx NICs.
>>>
>>>Presumably the Workgroup is the same as there can only be one Workgroup
>>>assigned to the computer, right?
>>>
>>>What if using 2 router(s) and they both have a WAN / Internet connection?
>>>Which router / address range will be providing internet access to each
>>>computer? Will it be one or the other only or can it be both for possibly
>>>higher bandwidth?
>>>
>>>This isn't homework and it isn't a particular problem I'm trying to solve.
>>>I'm wanting to learn about what happens in a situation like this -
>>>motivated
>>>by a question I tried to answer recently.
>>
>>
>> Firstly you are confusing Workgroup with TCP/IP. Workgroup is a
>> throwback to NetBios on Win 3.1. It has nothing to do with Internet
>> communication.
>>
>> If you have in mind a rationale for the configurations you are
>> describing, then there is probably a better solution.
>
>John,
>
>No, I'm not confusing Workgroups and TCP/IP. Whatever gave you that idea?
>One is a Windows thing. The other isn't limited to just Windows -
>obviously. I simply asked some questions. I've presumed that Windows only
>supports one Workgroup because there appears to be but one setting per
>computer - in that regard I only asked for confirmation.
>
>Any answers?

If there are two workgroups on the same LAN, only one will show in NN,
but you can access both of them. Try net view
\\computername-on-other-workgroup.

Without a rationale I have no incentive to wrap my brain around your
puzzle.

"John Wunderlich" <(E-Mail Removed)> wrote in message
news:Xns95ECF1E753DFwunderpsdrscraytheon@216.196.97.142...
> "Fred Marshall" <fmarshallx@remove_the_x.acm.org> wrote in
> news:ho-dnRo2P9fJB2fcRVn-(E-Mail Removed):
>
>> Computer 1:
>> NIC 1: 192.168.1.2 Netmask: 255.255.255.0
>> NIC 2: 192.168.100.2 Netmask: 255.255.255.0
>>
>> Computer 2:
>> NIC 1:192.168.1.3 Netmask: 255.255.255.0
>> NIC 2:192.168.100.3 Netmask: 255.255.255.0
>>
>> [...]
>> What if using 2 router(s) and they both have a WAN / Internet
>> connection? Which router / address range will be providing
>> internet access to each computer? Will it be one or the other
>> only or can it be both for possibly higher bandwidth?
>>
>
> I think you'd find that any traffic going to the 192.168.1.x subnet
> will go out the 192.168.1.x NIC and traffic going to the 192.168.100.x
> subnet will go out the 192.168.100.x NIC. Traffic going anywhere else
> will go out the NIC where the "default gateway" is defined, as the
> default gateway must be on one of these two subnets. If more than one
> gateway is defined, the first one is usually used unless it is not
> working.
>
> HTH,
> John

John,

OK - thanks. That makes sense.
Now, if each NIC has its own default gateway then.... ?
For example, if it's set up like this:

Computer 1:
NIC 1: 192.168.1.2 Netmask: 255.255.255.0 Gateways: 192.168.1.1 /
192.168.100.1
NIC 2: 192.168.100.2 Netmask: 255.255.255.0 Gateways: 192.168.100.1 /
192.168.1.1

Computer 2:
NIC 1:192.168.1.3 Netmask: 255.255.255.0 Gateways: 192.168.1.1 /
192.168.100.1
NIC 2:192.168.100.3 Netmask: 255.255.255.0 Gateways: 192.168.100.1 /
192.168.1.1

....where the first gateway shown above is entered as the default for each
NIC. So, there are two default gateways for each computer.

Fred

"Fred Marshall" <fmarshallx@remove_the_x.acm.org> wrote in
news:4_WdnSFvBIaasmDcRVn-(E-Mail Removed):

> Now, if each NIC has its own default gateway then.... ?
> For example, if it's set up like this:
>
> Computer 1:
> NIC 1: 192.168.1.2 Netmask: 255.255.255.0 Gateways: 192.168.1.1 /
> 192.168.100.1
> NIC 2: 192.168.100.2 Netmask: 255.255.255.0 Gateways:
> 192.168.100.1 / 192.168.1.1
>
> Computer 2:
> NIC 1:192.168.1.3 Netmask: 255.255.255.0 Gateways: 192.168.1.1 /
> 192.168.100.1
> NIC 2:192.168.100.3 Netmask: 255.255.255.0 Gateways: 192.168.100.1
> / 192.168.1.1
>
> ...where the first gateway shown above is entered as the default
> for each NIC. So, there are two default gateways for each
> computer.
>
>

One way to find out is to set this up. Then, open a command window
and enter the command:
route print
This will print out the routing tables. Start at the bottom and the
first line you come to going up with IP/0.0.0.0 NetMask/0.0.0.0 will be
the one that all the outside traffic will be directed through.

HTH,
John

OK - thanks John. That's very helpful!

Fred

"John Wunderlich" <(E-Mail Removed)> wrote in message
news:Xns95EED955B8AF3wunderpsdrscraytheon@216.196.97.142...
> "Fred Marshall" <fmarshallx@remove_the_x.acm.org> wrote in
> news:4_WdnSFvBIaasmDcRVn-(E-Mail Removed):
>
>> Now, if each NIC has its own default gateway then.... ?
>> For example, if it's set up like this:
>>
>> Computer 1:
>> NIC 1: 192.168.1.2 Netmask: 255.255.255.0 Gateways: 192.168.1.1 /
>> 192.168.100.1
>> NIC 2: 192.168.100.2 Netmask: 255.255.255.0 Gateways:
>> 192.168.100.1 / 192.168.1.1
>>
>> Computer 2:
>> NIC 1:192.168.1.3 Netmask: 255.255.255.0 Gateways: 192.168.1.1 /
>> 192.168.100.1
>> NIC 2:192.168.100.3 Netmask: 255.255.255.0 Gateways: 192.168.100.1
>> / 192.168.1.1
>>
>> ...where the first gateway shown above is entered as the default
>> for each NIC. So, there are two default gateways for each
>> computer.
>>
>>
>
> One way to find out is to set this up. Then, open a command window
> and enter the command:
> route print
> This will print out the routing tables. Start at the bottom and the
> first line you come to going up with IP/0.0.0.0 NetMask/0.0.0.0 will be
> the one that all the outside traffic will be directed through.
>
> HTH,
> John