network bridging configuration

[Guest]

Hi, I'm trying to make the network bridging functionnality to work between
two networks (wired) that have different IP segments. My understading is that
it should work but it doesn't. I'm using XP sp2 with 2 NIC. On one side I use
172.16.12.x and on the other side 102.0.0.x I set up NIC and create a
bridge. Bridge is created and both NIC are attached. The bridge grab an IP
from one DHCP at 172.16.12.x .
Question 1: is that ip should be use has gateway?
Question 2: I just can't ping "inter-segment" through the bridge.
Question 3: Can it be a subnet mask related problem ? (using 255.255.255.0)

Thks.

 

[Guest]

This is a complex subject, though basically the machines on each network
should have their default gateway set to be the IP on their side of the
router.

You also need to do this:

http://www.windowsnetworking.com/articles_tutorials/w2kprout.html

It should be apparent that dynamic addresses are not suitable for a router,
they need to be fixed.

It is also the case that while this will route pure TCP services, Windows
machines will not be able to "see" each other across the router, because they
do that by way of local-subnet broadcasts. For that to work you need either
LMHOSTS entries, or else a WINS or DNS server.

 

[Steve Winograd [MVP]]

Hi, I'm trying to make the network bridging functionnality to work between
two networks (wired) that have different IP segments. My understading is that
it should work but it doesn't. I'm using XP sp2 with 2 NIC. On one side I use
172.16.12.x and on the other side 102.0.0.x I set up NIC and create a
bridge. Bridge is created and both NIC are attached. The bridge grab an IP
from one DHCP at 172.16.12.x .
Question 1: is that ip should be use has gateway?
Question 2: I just can't ping "inter-segment" through the bridge.
Question 3: Can it be a subnet mask related problem ? (using 255.255.255.0)

Thks.

I'm sorry, but the network bridge can't do what you want. Its purpose
is to combine two or more physical network segments into a single
logical network segment with a single IP subnet. It can only have one
IP address, not one in each network. I've written a web page with
details:

XP ICS - Network Bridge
http://www.practicallynetworked.com/sharing/xp_ics/networkbridge.htm

You need a hardware or software router to move traffic between
different segments/subnets.

Why are you using the 102.0.0.x? That's a range of public IP
addresses, and using it could block access to some Internet sites.
These ranges are reserved for use in private networks:

10.0.0.0 - 10.255.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 - 192.168.255.255
--
Best Wishes,
Steve Winograd, MS-MVP (Windows Networking)

Please post any reply as a follow-up message in the news group
for everyone to see. I'm sorry, but I don't answer questions
addressed directly to me in E-mail or news groups.

Microsoft Most Valuable Professional Program
http://mvp.support.microsoft.com

 

[Guest]

thks for replies,
What about RRAS and
HKEY_LOCAL_MACHINE \SYSTEM\CurrentControlSet\Services\Tcpip \Parameters
subkey : "IPEnableRouter"
....
Any software router suggestion ?

 

[Doug Sherman [MVP]]

Yes:

1. Kill the bridge

2. Set IPEnableRouter to 1.

3. Clients on the 172.16.12.x network need a default gateway or static
route which points to the 172.16.12.x IP of the 2 NIC machine. And, clients
on the 102.0.0.x network need a default gateway or static route which points
to the 102.0.0.x IP of the 2 NIC machine.

Doug Sherman
MCSE, MCSA, MCP+I, MVP