Re: route on 2000 server which have 2 network cards for 2 internet connections

I take it you are using 2 default gateways ( 1 for each interface ). This
is not supported. The way the route table works, is the best gateway will
be chosen. In the event that both gateways are viewed as the same weight, a
random decision ( usually the first gateway listed ) is chosen.

It is possible to get around this issue by using Router Discovery, but then
again, 1 gateway will be the preferred until it drops, in which case the
other will pick up until the preferred comes back up.

What IS supported is multiple gateways on the same interface. Dead Gateway
Detection will allow recovery of TCP connections for failover.

Hope this helps, if not, post back with more specifics

--
--
Dusty Harper
Microsoft Corporation
----------------------------------------------------------------------------
This posting is provided "AS IS", with NO warranties and confers NO rights
----------------------------------------------------------------------------

"kwl1999" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> hello,my 2000 server have 2 network cards for 2 internet connections.
>
> connection 1 - 192.168.0.3
> connection 2 - 192.168.1.3
>
> tha facts that my clients come in and out as follow pattern:
>
> pattern in out
> 1 192.168.1.3 192.168.1.3
> 2 192.168.0.3 192.168.0.3
> 3 192.168.1.3 192.168.0.3
> 4 192.168.0.3 192.168.1.3
>
> How can i avoid pattern 3, 4 happen?
> Because my routers will see pattern 3, 4 as errors.
>
> i would like to ask can use "route" cmd to solve this problem;
> please give details solution because i still confused after reading
> command reference of route.
>
> Thanks a lot.
> (E-Mail Removed).
>

thx Dusty Harper, further question would like to ask:

1.How to configure Router Discovery?
2.If I configure multiple gateways on the same interface
(i.e. IP=192.168.0.99, Gateway=192.168.0.1, 192.168.0.2)
and the inbound connection is coming from 192.168.0.1,
is it still be possible for outgoing packets send to 192.168.0.2
and dropped by the router due to incomplete TCP sync?

Thanks a lot.
(E-Mail Removed)

Router Discovery is enabled in a two way process.

1) The client needs to accept Router Discovery packets

HKLM\System\CurrentControlSet\Services\TCPIP\Param eters\Interfaces\%Interfac
eGUID%
DWORD PerformRouterDiscovery = 0x01

This can also be enabled via DHCP using option # 31

2) The Routers must be enabled for RouterDiscovery.
On a Windows Server, this requires installing RRAS. under
the interface properties is where you configure the Router Discovery
Options.

I'm not sure I understand your 2nd question. If two routes are equal, and
currently you are using route 1 via Router 1, then Router 1 drops. Should
you start sending TCP traffic, Router 2 would then be used ( after a couple
of retries normally ) This happens anywhere in the TCP handshake.the
connection is basically re-established.

--
--
Dusty Harper
Microsoft Corporation
----------------------------------------------------------------------------
This posting is provided "AS IS", with NO warranties and confers NO rights
----------------------------------------------------------------------------



"stanley" <(E-Mail Removed)> wrote in message
news:#$(E-Mail Removed)...
> thx Dusty Harper, further question would like to ask:
>
> 1.How to configure Router Discovery?
> 2.If I configure multiple gateways on the same interface
> (i.e. IP=192.168.0.99, Gateway=192.168.0.1, 192.168.0.2)
> and the inbound connection is coming from 192.168.0.1,
> is it still be possible for outgoing packets send to 192.168.0.2
> and dropped by the router due to incomplete TCP sync?
>
> Thanks a lot.
> (E-Mail Removed)
>