Sign in with
Sign up | Sign in
Your question

Default Gateways and Router Connections

Last response: in Windows 2000/NT
Share
Anonymous
November 10, 2004 2:15:03 PM

Archived from groups: microsoft.public.windowsnt.protocol.tcpip (More info?)

I have three sites using Windows NT 4.0 servers and VPN
connections via T1 lines for connectivity. Site A is the
main facility with sites B and C connecting to Site A's
router for MS Exchange and MS SQL servers. Site A has
two routers, router1 allows connectivity to Sites B and C
and router2 allow Internet access. If the default
gateway on the Exchange Server is set to router1 then
both Sites B and C can connect to it without any
problems. If the Exchange Server's default gateway is
set to router2 for Internet access, Site B can still
connect to the Exchange Server but Site C cannot
connect. This scenario is the same for all the other
servers on Site A. Also, Site A can ping both Site B and
C's router no matter if its default gateway is set to
router1 or router2. I need the default gateway of the
Exchange Server to point to router2 so it can send Email
via the Internet. Why can Site C only connect to Site A
file servers if the Site A file servers default gateway
is pointing to router1?
Anonymous
November 11, 2004 10:18:52 PM

Archived from groups: microsoft.public.windowsnt.protocol.tcpip (More info?)

In article <4a0b01c4c759$94fc5c80$a401280a@phx.gbl>,
Bill Freeze <narron3211@yahoo.com> wrote:
> ... Site A has
>two routers, router1 allows connectivity to Sites B and C
>and router2 allow Internet access. If the default
>gateway on the Exchange Server is set to router1 then
>both Sites B and C can connect to it without any
>problems. If the Exchange Server's default gateway is
>set to router2 for Internet access, Site B can still
>connect to the Exchange Server but Site C cannot
>connect. ...
> ... Why can Site C only connect to Site A
>file servers if the Site A file servers default gateway
>is pointing to router1?

What subnets are A, B, and C in?

What does the Exchange Servers routing table look like?

--
-- Rod --
rodd(at)polylogics(dot)com
Anonymous
November 17, 2004 1:56:31 PM

Archived from groups: microsoft.public.windowsnt.protocol.tcpip (More info?)

A, B, and C are in private networks of 172.16.30.0,
172.16.20.0, and 172.16.40.0 respectively. They are use
subnet mask of 255.255.255.0

The following is a copy and paste of the Exchange
Servers's routing table:

C:\>route print

Active Routes:

Network Address Netmask Gateway
Address Interface Metric
0.0.0.0 0.0.0.0 172.16.30.11
172.16.30.105 1
0.0.0.0 0.0.0.0 172.16.30.35
172.16.30.105 1
127.0.0.0 255.0.0.0
127.0.0.1 127.0.0.1 1
172.16.20.0 255.255.255.0 172.16.30.11
172.16.30.105 1
172.16.20.155 255.255.255.255 172.16.30.11
172.16.30.105 1
172.16.20.156 255.255.255.255 172.16.30.11
172.16.30.105 1
172.16.20.165 255.255.255.255 172.16.30.11
172.16.30.105 1
172.16.20.167 255.255.255.255 172.16.30.11
172.16.30.105 1
172.16.20.169 255.255.255.255 172.16.30.11
172.16.30.105 1
172.16.20.171 255.255.255.255 172.16.30.11
172.16.30.105 1
172.16.30.0 255.255.255.0 172.16.30.105
172.16.30.105 1
172.16.30.105 255.255.255.255
127.0.0.1 127.0.0.1 1
172.16.40.0 255.255.255.0 172.16.30.11
172.16.30.105 1
172.16.255.255 255.255.255.255 172.16.30.105
172.16.30.105 1
224.0.0.0 224.0.0.0 172.16.30.105
172.16.30.105 1
255.255.255.255 255.255.255.255 172.16.30.105
172.16.30.105 1

The only question I have with the routing table is the
172.16.20.155-172.16.20.171 IP Addresses. These are not
static IP address on the 172.16.20.0 network or on the
Exchange Server. I have used the "Route Delete" command
to remove these addresses but they keep reappearing.
Anonymous
November 18, 2004 10:16:26 PM

Archived from groups: microsoft.public.windowsnt.protocol.tcpip (More info?)

In article <6efa01c4ccd7$26bbbfd0$a601280a@phx.gbl>,
Bill Freeze <anonymous@discussions.microsoft.com> wrote:
>A, B, and C are in private networks of 172.16.30.0,
>172.16.20.0, and 172.16.40.0 respectively. They are use
>subnet mask of 255.255.255.0
> ...
> Network Address Netmask Gateway Address Interface
> 0.0.0.0 0.0.0.0 172.16.30.11 172.16.30.105
> 0.0.0.0 0.0.0.0 172.16.30.35 172.16.30.105

Your problem is you've got two default gateways.

From the rest of your routing table it looks like 'router1' is
172.16.30.11 connecting to sites B & C and 'router2' is 172.16.30.35
connecting to the internet.

You've got the needed /24 routes
> 172.16.20.0 255.255.255.0 172.16.30.11 172.16.30.105
> 172.16.30.0 255.255.255.0 172.16.30.105 172.16.30.105
> 172.16.40.0 255.255.255.0 172.16.30.11 172.16.30.105
for your three networks.

Try to delete the default route to 'router1'
> 0.0.0.0 0.0.0.0 172.16.30.11 172.16.30.105
the only addresses routed via that path should be 172.16.20/24 and
172.16.40/24

--
-- Rod --
rodd(at)polylogics(dot)com
Related resources
!