Routing Config Question

Posted this in a couple areas, not sure which group it falls in.
This maybe a basic routing question to most but I'm confused.

I'll keep it simple in discription so
Network A coming into router 1,
Network B coming into router 2,
both router attach to the main network (Network C).
a 3rd router is hanging off the main network attaching it to the Internet.

The question, which router do I point to as the default gateway configing
the clients on Net C?
To router 1, 2, or 3

Example
(Net A)192.168.5.1 (Net C)192.168.0.1

(Net B)192.168.10.1 (Net C)192.168.0.2

internet (Net C) 192.168.0.3 (Internet) 216.x.x.x

Are you running a routing protocol (RIP, OSPF) or are you using static
routes? Either way you should have all routes in all routers. If you have
more internet traffic than traffic to the remotes I would say point them to
router 3. Router 3 must have routes to the remote networks!

"vidro" <(E-Mail Removed)> wrote in message
news:A3398318-8764-429F-A2F4-(E-Mail Removed)...
> Posted this in a couple areas, not sure which group it falls in.
> This maybe a basic routing question to most but I'm confused.
>
> I'll keep it simple in discription so
> Network A coming into router 1,
> Network B coming into router 2,
> both router attach to the main network (Network C).
> a 3rd router is hanging off the main network attaching it to the Internet.
>
> The question, which router do I point to as the default gateway configing
> the clients on Net C?
> To router 1, 2, or 3
>
> Example
> (Net A)192.168.5.1 (Net C)192.168.0.1
>
> (Net B)192.168.10.1 (Net C)192.168.0.2
>
> internet (Net C) 192.168.0.3 (Internet)
216.x.x.x
>
>

All static.


"Neteng" wrote:

> Are you running a routing protocol (RIP, OSPF) or are you using static
> routes? Either way you should have all routes in all routers. If you have
> more internet traffic than traffic to the remotes I would say point them to
> router 3. Router 3 must have routes to the remote networks!
>
> "vidro" <(E-Mail Removed)> wrote in message
> news:A3398318-8764-429F-A2F4-(E-Mail Removed)...
> > Posted this in a couple areas, not sure which group it falls in.
> > This maybe a basic routing question to most but I'm confused.
> >
> > I'll keep it simple in discription so
> > Network A coming into router 1,
> > Network B coming into router 2,
> > both router attach to the main network (Network C).
> > a 3rd router is hanging off the main network attaching it to the Internet.
> >
> > The question, which router do I point to as the default gateway configing
> > the clients on Net C?
> > To router 1, 2, or 3
> >
> > Example
> > (Net A)192.168.5.1 (Net C)192.168.0.1
> >
> > (Net B)192.168.10.1 (Net C)192.168.0.2
> >
> > internet (Net C) 192.168.0.3 (Internet)
> 216.x.x.x
> >
> >
>
>
>

If you want the machines in Net C to have Internet access, they will
need to have their default gateway set out to the Internet via the external
NIC. If you want A and B to be able to route to C, you will need static
routes on the third router to forward traffic for 192.168.5.0 and
192.168.10.0 via 192.168.0.1 and 192.168.0.2 respectively to their local
router. Whithout those routes, the local traffic will go out to the Internet
and be lost.

vidro wrote:
> All static.
>
>
> "Neteng" wrote:
>
>> Are you running a routing protocol (RIP, OSPF) or are you using
>> static routes? Either way you should have all routes in all routers.
>> If you have more internet traffic than traffic to the remotes I
>> would say point them to router 3. Router 3 must have routes to the
>> remote networks!
>>
>> "vidro" <(E-Mail Removed)> wrote in message
>> news:A3398318-8764-429F-A2F4-(E-Mail Removed)...
>>> Posted this in a couple areas, not sure which group it falls in.
>>> This maybe a basic routing question to most but I'm confused.
>>>
>>> I'll keep it simple in discription so
>>> Network A coming into router 1,
>>> Network B coming into router 2,
>>> both router attach to the main network (Network C).
>>> a 3rd router is hanging off the main network attaching it to the
>>> Internet.
>>>
>>> The question, which router do I point to as the default gateway
>>> configing the clients on Net C?
>>> To router 1, 2, or 3
>>>
>>> Example
>>> (Net A)192.168.5.1 (Net C)192.168.0.1
>>>
>>> (Net B)192.168.10.1 (Net C)192.168.0.2
>>>
>>> internet (Net C) 192.168.0.3 (Internet)
>>> 216.x.x.x

"vidro" <(E-Mail Removed)> wrote in message
news:1C636210-FB92-47AF-A199-(E-Mail Removed)...
> > > I'll keep it simple in discription so
> > > Network A coming into router 1,
> > > Network B coming into router 2,
> > > both router attach to the main network (Network C).
> > > a 3rd router is hanging off the main network attaching it to the
Internet.

Net-A uses router1 as the DFG
Net-B uses router2 as the DFG

Net-C uses "any router you want" as the DFG. Perferably either Router1 or 2
because your LAN should never be made dependent on an "Internet Device" to
function within itself. You want the LAN to continue functioning even if
the Internet Device falls off the face of the earth,....or maybe just gets
DoS'ed by a threat since it *is* the device directly exposed to the Internet
after all.

Both routers 1&2 use the Internet Device as the DFG

The Internet Device requires two Static Routes that tells it to use:
1. ...router1 to get to Net-A
2. ... and use router2 to get the Net-B

--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com
-----------------------------------------------------
Understanding the ISA 2004 Access Rule Processing
http://www.isaserver.org/articles/IS...cessRules.html

Microsoft Internet Security & Acceleration Server: Guidance
http://www.microsoft.com/isaserver/t...dance/2004.asp
http://www.microsoft.com/isaserver/t...dance/2000.asp

Microsoft Internet Security & Acceleration Server: Partners
http://www.microsoft.com/isaserver/partners/default.asp
-----------------------------------------------------

Routers don't have default gateways, they have default routes and gateways
of last resort. There is nothing wrong with pointing your LAN to an internet
router either.

"Phillip Windell" <@.> wrote in message
news:ur1fp%(E-Mail Removed)...
> "vidro" <(E-Mail Removed)> wrote in message
> news:1C636210-FB92-47AF-A199-(E-Mail Removed)...
> > > > I'll keep it simple in discription so
> > > > Network A coming into router 1,
> > > > Network B coming into router 2,
> > > > both router attach to the main network (Network C).
> > > > a 3rd router is hanging off the main network attaching it to the
> Internet.
>
> Net-A uses router1 as the DFG
> Net-B uses router2 as the DFG
>
> Net-C uses "any router you want" as the DFG. Perferably either Router1 or
2
> because your LAN should never be made dependent on an "Internet Device" to
> function within itself. You want the LAN to continue functioning even if
> the Internet Device falls off the face of the earth,....or maybe just gets
> DoS'ed by a threat since it *is* the device directly exposed to the
Internet
> after all.
>
> Both routers 1&2 use the Internet Device as the DFG
>
> The Internet Device requires two Static Routes that tells it to use:
> 1. ...router1 to get to Net-A
> 2. ... and use router2 to get the Net-B
>
> --
> Phillip Windell [MCP, MVP, CCNA]
> www.wandtv.com
> -----------------------------------------------------
> Understanding the ISA 2004 Access Rule Processing
> http://www.isaserver.org/articles/IS...cessRules.html
>
> Microsoft Internet Security & Acceleration Server: Guidance
> http://www.microsoft.com/isaserver/t...dance/2004.asp
> http://www.microsoft.com/isaserver/t...dance/2000.asp
>
> Microsoft Internet Security & Acceleration Server: Partners
> http://www.microsoft.com/isaserver/partners/default.asp
> -----------------------------------------------------
>
>
>

"Neteng" <(E-Mail Removed)> wrote in message
news:OCxRO%(E-Mail Removed)...
> Routers don't have default gateways, they have default routes and gateways
> of last resort.

It is the same thing, just different terminology. Yes, Cisco for example,
uses the term "gateway of last resort".

> There is nothing wrong with pointing your LAN to an internet
> router either.

Nothing wrong with doing it the other way either. I just don't like making a
LAN dependent on any Internet Device for anything except the Internet. I
want the LAN to continure functioning even if totally separated from the
Intenet and any device associated with the Internet. I have 6 paths out to
the Interent at our place with a multiple subnet LAN, and I could yank the
plug on all 6 of the Internet Gateway Devices at the same time and the LAN
would be totally unaffected other than there just wouldn't be any internet
access and the users couldn't download their viruses and spyware until I
plugged things back in.

However with a small typical single subnet LAN, the Internet Device is
really the only "gateway" that exists and so it would obviously be used. But
in that situation you could yank out the Internet Device and the LAN would
still function because no gateway is need for LAN operation in a single
subnet. But with multiple subnet LANs I always insist on the way I
described it.

--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com
-----------------------------------------------------
Understanding the ISA 2004 Access Rule Processing
http://www.isaserver.org/articles/IS...cessRules.html

Microsoft Internet Security & Acceleration Server: Guidance
http://www.microsoft.com/isaserver/t...dance/2004.asp
http://www.microsoft.com/isaserver/t...dance/2000.asp

Microsoft Internet Security & Acceleration Server: Partners
http://www.microsoft.com/isaserver/partners/default.asp
-----------------------------------------------------

I have to disagree that a Gateway of Last Resort is the same as a default
gateway, but we'll discuss this on a future post...

"Phillip Windell" <@.> wrote in message
news:(E-Mail Removed)...
> "Neteng" <(E-Mail Removed)> wrote in message
> news:OCxRO%(E-Mail Removed)...
> > Routers don't have default gateways, they have default routes and
gateways
> > of last resort.
>
> It is the same thing, just different terminology. Yes, Cisco for example,
> uses the term "gateway of last resort".
>
> > There is nothing wrong with pointing your LAN to an internet
> > router either.
>
> Nothing wrong with doing it the other way either. I just don't like making
a
> LAN dependent on any Internet Device for anything except the Internet. I
> want the LAN to continure functioning even if totally separated from the
> Intenet and any device associated with the Internet. I have 6 paths out
to
> the Interent at our place with a multiple subnet LAN, and I could yank the
> plug on all 6 of the Internet Gateway Devices at the same time and the LAN
> would be totally unaffected other than there just wouldn't be any internet
> access and the users couldn't download their viruses and spyware until I
> plugged things back in.
>
> However with a small typical single subnet LAN, the Internet Device is
> really the only "gateway" that exists and so it would obviously be used.
But
> in that situation you could yank out the Internet Device and the LAN would
> still function because no gateway is need for LAN operation in a single
> subnet. But with multiple subnet LANs I always insist on the way I
> described it.
>
> --
> Phillip Windell [MCP, MVP, CCNA]
> www.wandtv.com
> -----------------------------------------------------
> Understanding the ISA 2004 Access Rule Processing
> http://www.isaserver.org/articles/IS...cessRules.html
>
> Microsoft Internet Security & Acceleration Server: Guidance
> http://www.microsoft.com/isaserver/t...dance/2004.asp
> http://www.microsoft.com/isaserver/t...dance/2000.asp
>
> Microsoft Internet Security & Acceleration Server: Partners
> http://www.microsoft.com/isaserver/partners/default.asp
> -----------------------------------------------------
>
>
>