Re: DHCP clients; where does the preffered routes come from?
- From: "Bill Grant" <not.available@online>
- Date: Sat, 19 Nov 2005 12:06:41 +1100
Your DHCP clients in the 192.168.1 subnet will be getting a default
gateway from DHCP. That default gateway must be a 192.168.1.x address. The
default gateway must be "reachable" - ie it must be on the same segment and
in the same IP subnet as the host machine.
The problem you are seeing will be caused by the default gateway
settings on the machines in the 192.168.2 subnet. The traffic from a
machine in the 192.168.1 subnet will go to the router which is defined as
the default gateway for the subnet. This router will deliver the packet to
the target machine in the 192.168.2 subnet.
The problem is then how does that machine send a reply back to the
192.168.1 subnet? As you say, if you give them a default gateway of
192.168.2.5 it will work. It will also work if you add a route to the target
machine to send traffic for 192.168.1 to that address.
I presume you want to leave the machines in 192.168.2 pointing to
192.168.2.10 as their default gateway but still be able to "see" the
machines in 192.168.1 ? The simplest way to achieve this is to add a static
route to the router at 192.168.2.10 . All traffic goes to that router by
default. Add a static route to it to "bounce" the local traffic to the
router at 192.168.2.5 . eg
192.168.1.0 255.255.255.0 192.168.2.5
vidro wrote:
> Where do my DHCP clients pick up the gate way to point to the
> 192.168.2.5?
>
> Is the default gateway that is configure in the IP address of the DNS
> server passed on to the DHCP clients?
>
> I have 3 router on a network some clients have configured different IP
> address for their Default gateway.
>
> Scenario:
> Subnet 1: 192.168.1.x has DHCP server and clients
> subnet 2: 192.168.2.x has DNS server
> Two routers on subnet two 192.168.2.5 and 192.168.2.10.
> The DHCP clients on subnet 1 can attach to shared resource of those
> clients on subnet 2 that have been configured with a default gateway
> of 192.168.2.5 but the DHCP clients can not access client on subnet 2
> with default gateway of 192.168.2.10.
> If the clients with Gateways of 192.168.2.10 are reconfigured with a
> GW of 192.168.2.5 the DHCP clients can access the resources.
> If the clients with a GW of 192.168.2.10 have a "Route add" pointing
> to the gate way ( not shown in this scenario) to get to the
> 192.168.1.x network. Than the DHCP clients on 192.168.1.x can access
> the resources.
>
> My question than is it looks like my DHCP clients are picking up a
> preferred gateway of 192.168.2.5 where is this value coming from, if
> my DHCP clients are on a subnet 192.168.1.X?
.
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