IP Forwarding not working

[summoner]

I have a windows 2000 server with SP4 and exchange 2000. I've enabled routing and remote access and enabled Routing on both tabs when you bring up properties of the server.

This server is multihomed and hosts from one subnet cannot ping to hosts on the other subnet. They can ping the NIC thats located on the alternate subnet, but this NIC will not forward the requests out the subnet.

192.168.6.0/24 |server| 192.168.2.0/24
Server IP addresses are 192.168.6.2 & 192.168.2.8. Hosts from the 192.168.6.x network can ping the NIC in the alternate subnet, but cant ping hosts in the alternate subnet. I've even tried a registry edit that should force IP forwarding. (

http://support.microsoft.com/default.aspx?scid=kb;en-us;Q230082

) I've rebooted after all changes. No luck yet.

 

[ChicagoTechNet]

have you installed NAT? also posting the routing table and ipconfig /all here may help.

Robert Lin, MS-MVP, MCSE & CNE
Windows, Network, Internet, VPN, Routing and How to at

http://www.ms-mvps.com

 

[summoner]

Im not trying to NAT anything...I'm just trying to route from one network to another. I'll post the more specific IP address info when i get into the office tommorow.

 

[vbrocks]

Have you correctly setup your default gateways on the clients?

 

[summoner]

Heres is the output of "ipconfig /all"

Windows 2000 IP Configuration



Host Name . . . . . . . . . . . . : thunderchild
Primary DNS Suffix . . . . . . . : ****.local
Node Type . . . . . . . . . . . . : Broadcast

IP Routing Enabled. . . . . . . . : Yes

WINS Proxy Enabled. . . . . . . . : No

DNS Suffix Search List. . . . . . : ****.local

Ethernet adapter ALB_PUBLIC:



Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) Advanced Network Services Virtual Adapter #2
Physical Address. . . . . . . . . : 00-0E-0C-07-66-5E

DHCP Enabled. . . . . . . . . . . : No

IP Address. . . . . . . . . . . . : 192.168.2.8

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . : 192.168.2.254

DNS Servers . . . . . . . . . . . : 192.168.2.18
192.168.2.19
198.6.1.142
198.6.1.122

Ethernet adapter ALB_Back:



Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) Advanced Network Services Virtual Adapter
Physical Address. . . . . . . . . : 00-0E-0C-07-69-68

DHCP Enabled. . . . . . . . . . . : No

IP Address. . . . . . . . . . . . : 192.168.3.2

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . :

DNS Servers . . . . . . . . . . . : 192.168.2.18
192.168.2.19

Ethernet adapter FB500:



Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Server Adapter #5
Physical Address. . . . . . . . . : 00-0E-0C-07-64-D8

DHCP Enabled. . . . . . . . . . . : No

IP Address. . . . . . . . . . . . : 192.168.6.2

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . :

DNS Servers . . . . . . . . . . . : 192.168.2.18
192.168.2.19
198.6.1.142
198.6.1.122

Heres the output of "route print"

===========================================================================
Interface List
0x1 ........................... MS TCP Loopback interface
0x1000003 ...00 0e 0c 07 66 5e ...... Intel (R) Advanced Networking Services (iANS) NDIS Intermediate Driver
0x1000004 ...00 0e 0c 07 69 68 ...... Intel (R) Advanced Networking Services (iANS) NDIS Intermediate Driver
0x1000005 ...00 0e 0c 07 64 d8 ...... Intel(R) PRO/1000 MT Server Adapter
===========================================================================
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.2.254 192.168.2.8 1
65.169.51.160 255.255.255.252 192.168.6.5 192.168.6.2 1
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
192.168.2.0 255.255.255.0 192.168.2.8 192.168.2.8 1
192.168.2.8 255.255.255.255 127.0.0.1 127.0.0.1 1
192.168.2.255 255.255.255.255 192.168.2.8 192.168.2.8 1
192.168.3.0 255.255.255.0 192.168.3.2 192.168.3.2 1
192.168.3.2 255.255.255.255 127.0.0.1 127.0.0.1 1
192.168.3.255 255.255.255.255 192.168.3.2 192.168.3.2 1
192.168.6.0 255.255.255.0 192.168.6.2 192.168.6.2 1
192.168.6.2 255.255.255.255 127.0.0.1 127.0.0.1 1
192.168.6.255 255.255.255.255 192.168.6.2 192.168.6.2 1
192.168.50.0 255.255.255.0 192.168.6.5 192.168.6.2 1
224.0.0.0 224.0.0.0 192.168.2.8 192.168.2.8 1
224.0.0.0 224.0.0.0 192.168.3.2 192.168.3.2 1
224.0.0.0 224.0.0.0 192.168.6.2 192.168.6.2 1
255.255.255.255 255.255.255.255 192.168.2.8 192.168.2.8 1
Default Gateway: 192.168.2.254
===========================================================================
Persistent Routes:
None

 

[summoner]

Yes the default gateway is setup correctly on the client. I have the NIC of the win2k server set as the gateway for all clients in that subnet. From the 192.168.6.x network I can ping sucessfully the 192.168.2.8 NIC but I cant ping 192.168.2.x hosts. Anyone ever seen this before? very strange

 

[vbrocks]

Please show us the client's ip config /all .....

 

[summoner]

The network configuration has changed and we are no longer using win2k as a router. Thanks for the responses.