TCP works different from XP?

[Guest]

Hi there,
I'm experiencing this kind of problem:

I have one NIC with 2 IP Addresses:

10.32.85.130 ---> that is the Lan where at 10.32.85.1 there is a
router/modem ADSL

10.70.204.130 --> that is the Office Lan, where the gateway is 10.70.204.254

I Need that all the information that start with 10.0 and 192.168 are routed
to the 10.70.204.254 router...

So the NIC configuration is:

IP: 10.32.85.130
mask: 255.255.255.0
gw: 10.32.85.1

DNS: 10.70.204.172 - 192.168.97.57 - 192.168.97.58

in Advanced I setted up the second IP for the NIC: 10.70.204.130

Than I added (finally ) the static route:

route -p add 10.70.0.0 mask 255.255.0.0 10.70.204.254
route -p add 192.168.0.0 mask 255.255.0.0 10.70.204.254

Ok in this case, I can go to Internet, I cant reach all the PC on the 10.70
network but if I try to ping a Pc on the 192.168 network it always anser back
that the ping was bad.

But, and this is the strange, if in the NIC configuration, I put as first
address the 10.70.204.135 and as second the 10.32.85.135, than I can reach
all the PC on the 10.70 network, all the pc on the 192.168 network but I
can't go to internet!

Of course I can ping the 10.32.85.1 Router, all the "names" are resolved
from the DNS but never reached.

So seems that if the 10.70.204.135 address is the first of the two address
of the NIC, than the 192.168 network (that in its routing table knows the
10.70 network) works fine, if the address is the second of the NIC the
192.168 network can't resolve the address back as it read the lan
10.32.85.135 as address evenif the 10.70.204.135 too...

The same configuration run well on all the other PC (with Windows XP) ...so
do you know if there is some kind of change in the TCP/IP stack in Vista that
all the IP Packets shown only the first address of the NIC???

Thank you in advance
Luca

 

[AJR]

Quick note - NIC subnet mask is 255.255.255.0 - route-p set at 255.255.0.0.