3 Routers, Two Subnet and Two Internet Connection

  • Thread starter Thread starter addygill@hotmail.com
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addygill@hotmail.com

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Hi,
We have two subnets linked together and two seperate routers that pipe
out to the Internet, with another router joining the two subnets
together. We need one subnet to use one Internet connection and the
other subnet to use the other Internet connection. At the moment, it
is set up as follows:

Internet Connection (External IP) -> Router A (192.168.0.31) -> Subnet
A -> Router B (Subnet A,192.168.0.42), (Subnet B, 192.168.1.1) ->
Subnet B -> Router C (192.168.1.31) -> Internet Connection (External
IP)

I've managed to set it up so Subnet A and B can talk to each other,
and one of the subnet can get out onto their Internet, but I'm unable
to get it so they can both get out onto their seperate Internet
connections. Any ideas what I'm doing wrong?

Thanks.
 
Re: 3 Routers, Two Subnet and Two Internet Connection

addygill@hotmail.com wrote:
> Hi,
> We have two subnets linked together and two seperate routers that pipe
> out to the Internet, with another router joining the two subnets
> together. We need one subnet to use one Internet connection and the
> other subnet to use the other Internet connection. At the moment, it
> is set up as follows:
>
> Internet Connection (External IP) -> Router A (192.168.0.31) -> Subnet
> A -> Router B (Subnet A,192.168.0.42), (Subnet B, 192.168.1.1) ->
> Subnet B -> Router C (192.168.1.31) -> Internet Connection (External
> IP)
>
> I've managed to set it up so Subnet A and B can talk to each other,
> and one of the subnet can get out onto their Internet, but I'm unable
> to get it so they can both get out onto their seperate Internet
> connections. Any ideas what I'm doing wrong?
>
> Thanks.

Well this is not realy a 2003 Server problem but ok.....

Have you looked at the default gateway in each subnet?
 
Re: 3 Routers, Two Subnet and Two Internet Connection


<addygill@hotmail.com> wrote in message
news:483edb40-9290-44a4-b68e-10cb59031adb@n1g2000prb.googlegroups.com...
| Hi,
| We have two subnets linked together and two seperate routers that pipe
| out to the Internet, with another router joining the two subnets
| together. We need one subnet to use one Internet connection and the
| other subnet to use the other Internet connection. At the moment, it
| is set up as follows:
|
| Internet Connection (External IP) -> Router A (192.168.0.31) -> Subnet
| A -> Router B (Subnet A,192.168.0.42), (Subnet B, 192.168.1.1) ->
| Subnet B -> Router C (192.168.1.31) -> Internet Connection (External
| IP)
|
| I've managed to set it up so Subnet A and B can talk to each other,
| and one of the subnet can get out onto their Internet, but I'm unable
| to get it so they can both get out onto their seperate Internet
| connections. Any ideas what I'm doing wrong?
|
| Thanks.

Just a guess, but try the following.

- Set all PC's to use 192.168.0.0/23 as their network. (IP 192.168.x.x with
a mask of 255.255.254.0)
- Put the IP of Router A on the first half of the subnet (such as
192.168.0.1)
- Put the IP of Router B on the second half of the subnet (such as
192.168.1.1)
- Set the default gateway on subnet A PC's to 192.168.0.1 (Router A)
- Set the default gateway on subnet B PC's to 192.168.1.1 (Router B)
- Connect the LAN side of Router A to the LAN side of Router B
(assuming you have two seperate internet connections...)
- Connect the WAN port of Router A to Internet connection #1
- Connect the WAN port of router B to Internet connection #2
(assuming you have one internet connection...)
- Put the WAN ports of your router into a switch
- Connect your internet to the switch

You shouldn't need Router C at all.

If you want failover, should one internet connection go down, you could add
the opposite gateway to the TCP/IP settings with a higher metric. This will
let the PC try it's normal connection first, then the second gateway should
the first not work.
 
Re: 3 Routers, Two Subnet and Two Internet Connection

On Apr 7, 6:27 pm, "Calab" <mys...@csd.ca> wrote:
> <addyg...@hotmail.com> wrote in message
>
> news:483edb40-9290-44a4-b68e-10cb59031adb@n1g2000prb.googlegroups.com...
> | Hi,
> | We have two subnets linked together and two seperate routers that pipe
> | out to the Internet, with another router joining the two subnets
> | together. We need one subnet to use one Internet connection and the
> | other subnet to use the other Internet connection. At the moment, it
> | is set up as follows:
> |
> | Internet Connection (External IP) -> Router A (192.168.0.31) -> Subnet
> | A -> Router B (Subnet A,192.168.0.42), (Subnet B, 192.168.1.1) ->
> | Subnet B -> Router C (192.168.1.31) -> Internet Connection (External
> | IP)
> |
> | I've managed to set it up so Subnet A and B can talk to each other,
> | and one of the subnet can get out onto their Internet, but I'm unable
> | to get it so they can both get out onto their seperate Internet
> | connections. Any ideas what I'm doing wrong?
> |
> | Thanks.
>
> Just a guess, but try the following.
>
> - Set all PC's to use 192.168.0.0/23 as their network. (IP 192.168.x.x with
> a mask of 255.255.254.0)
> - Put the IP of Router A on the first half of the subnet (such as
> 192.168.0.1)
> - Put the IP of Router B on the second half of the subnet (such as
> 192.168.1.1)
> - Set the default gateway on subnet A PC's to 192.168.0.1 (Router A)
> - Set the default gateway on subnet B PC's to 192.168.1.1 (Router B)
> - Connect the LAN side of Router A to the LAN side of Router B
> (assuming you have two seperate internet connections...)
> - Connect the WAN port of Router A to Internet connection #1
> - Connect the WAN port of router B to Internet connection #2
> (assuming you have one internet connection...)
> - Put the WAN ports of your router into a switch
> - Connect your internet to the switch
>
> You shouldn't need Router C at all.
>
> If you want failover, should one internet connection go down, you could add
> the opposite gateway to the TCP/IP settings with a higher metric. This will
> let the PC try it's normal connection first, then the second gateway should
> the first not work.

Thanks for your help guys. Sorry, I probably should have given more
details. Unfortunately, I need the two subnets as I've got two
separate sites set up in Active Directory Sites and Services.
 
Re: 3 Routers, Two Subnet and Two Internet Connection

For each subnet/segment, you need to set every machine to use the local
Internet router as its default gateway. This will get you Internet access
through the local internet router, but will kill LAN to LAN routing.

To get LAN routing back, set a static route on each gateway router to
bounce the local traffic to the LAN router (ie router B). eg

Internet
|
router A
192.168.0 31
|
LAN A clients
192.168.0 x dg 192.168.0.31
|
192.168.0.42 dg blank
router B
192.168.1.1 dg blank
|
LAN B clients
192.168.1.x dg 192.168.1.31
|
192.168.1.31
router C
|
Internet

On router A you need a static route
192.168.1.0 255.255.255.0 192.168.0.42
to get traffic for LAN B to the internal router.

On router C you need a static route
192.168.0.0 255.255.255.0 192.168.1.1
to get trffic for LAN A to the internal router.
 
Re: 3 Routers, Two Subnet and Two Internet Connection

On Apr 8, 11:35 am, "Bill Grant" <not.available@online> wrote:
>    For each subnet/segment, you need to set every machine to use the local
> Internet router as its default gateway. This will get you Internet access
> through the local internet router, but will kill LAN to LAN routing.
>
>     To get LAN routing back, set a static route on each gateway router to
> bounce the local traffic to the LAN router (ie router B).  eg
>
>     Internet
>         |
>    router A
>  192.168.0 31
>         |
>  LAN A clients
>  192.168.0 x    dg  192.168.0.31
>         |
>  192.168.0.42   dg   blank
>     router B
>   192.168.1.1    dg   blank
>        |
>     LAN B clients
>   192.168.1.x     dg   192.168.1.31
>         |
>   192.168.1.31
>      router C
>           |
>    Internet
>
>   On router A you need a static route
>    192.168.1.0    255.255.255.0    192.168.0.42
>  to get traffic for LAN B to the internal router.
>
>    On router C you need a static route
>   192.168.0.0   255.255.255.0   192.168.1.1
>  to get trffic for LAN A to the internal router.

Thanks guys, sorted it using your help.
 
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