Two Networks on two adapters

  • Thread starter Thread starter Leon Hattingh
  • Start date Start date
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Leon Hattingh

Ok, it is a bit of a mix up, Hope you can understand.

I have 1 PC that I need to connect to 2 different networks at the same time.
It has 1 onboard adapter (Adapter “Aâ€) and 1 pci Network adapter (Adapter “Bâ€)
“A†connects to Lan “Aâ€, Router and Internet with a dynamic IP address
IP 192.168.1.X
Mask 255.255.255.0
Gate 192.168.1.1
DNS 192.168.1.1
“B†Connects to LAN “B†without Internet and Static IP
IP 192.168.1.50,
Mask 255.255.255.0
“A†communicates, “B†does NOT,
If I disable adapter “A†then “B†communicates.

If I invert the system, “A†for “B†and “B†for “A†I have the same problem,
connection to Lan “B†but not to “A†and Internet until I disable the Onboard
lan “B†adapter

HOW can I get the 2 networks to work at the same time, Without disabling
one???
 
Ok, it is a bit of a mix up, Hope you can understand.

I have 1 PC that I need to connect to 2 different networks at the same time.
It has 1 onboard adapter (Adapter "A") and 1 pci Network adapter (Adapter "B")
"A" connects to Lan "A", Router and Internet with a dynamic IP address
IP 192.168.1.X
Mask 255.255.255.0
Gate 192.168.1.1
DNS 192.168.1.1
"B" Connects to LAN "B" without Internet and Static IP
IP 192.168.1.50,
Mask 255.255.255.0
"A" communicates, "B" does NOT,
If I disable adapter "A" then "B" communicates.

If I invert the system, "A" for "B" and "B" for "A" I have the same problem,
connection to Lan "B" but not to "A" and Internet until I disable the Onboard
lan "B" adapter

HOW can I get the 2 networks to work at the same time, Without disabling
one???
Click to expand...

Your problem is the fact that both are using the exact same IP
addressing scheme. You need to change one of the network from
192.168.1.xxx to 192.168.[2-254].

When both are using the same IP scheme, then XP does not know how to
direct to redirect over the different adapters.
 
Exactly,

I learned this issue the hard way years ago when I first setup our TCP/IP
network and used 192.168.1.x as well. Then all of a sudden everyone's home
router came out with either .0.x or .1.x as well and half of them started
having connection issues. What a PIA that was.

Now I switched my internal 192.168.x.x number to an obscure one to hope to
avoid issues in the future.

As smlunatick pointed out, when you have two nics with the same IP range the
one that is bound at the top is the one that will route all the traffic.


smlunatick said:
Ok, it is a bit of a mix up, Hope you can understand.

I have 1 PC that I need to connect to 2 different networks at the same
time.
It has 1 onboard adapter (Adapter "A") and 1 pci Network adapter (Adapter
"B")
"A" connects to Lan "A", Router and Internet with a dynamic IP address
IP 192.168.1.X
Mask 255.255.255.0
Gate 192.168.1.1
DNS 192.168.1.1
"B" Connects to LAN "B" without Internet and Static IP
IP 192.168.1.50,
Mask 255.255.255.0
"A" communicates, "B" does NOT,
If I disable adapter "A" then "B" communicates.

If I invert the system, "A" for "B" and "B" for "A" I have the same
problem,
connection to Lan "B" but not to "A" and Internet until I disable the
Onboard
lan "B" adapter

HOW can I get the 2 networks to work at the same time, Without disabling
one???
Click to expand...

Your problem is the fact that both are using the exact same IP
addressing scheme. You need to change one of the network from
192.168.1.xxx to 192.168.[2-254].

When both are using the same IP scheme, then XP does not know how to
direct to redirect over the different adapters.
Click to expand...
 
Exactly,

I learned this issue the hard way years ago when I first setup our TCP/IP
network and used 192.168.1.x as well.  Then all of a sudden everyone's home
router came out with either .0.x or .1.x as well and half of them started
having connection issues.  What a PIA that was.

Now I switched my internal 192.168.x.x number to an obscure one to hope to
avoid issues in the future.

As smlunatick pointed out, when you have two nics with the same IP range the
one that is bound at the top is the one that will route all the traffic.




Your problem is the fact that both are using the exact same IP
addressing scheme. You need to change one of the network from
192.168.1.xxx to 192.168.[2-254].
Click to expand...
When both are using the same IP scheme, then XP does not know how to
direct to redirect over the different adapters.- Hide quoted text -
Click to expand...

- Show quoted text -
Click to expand...

I've gone to the extreme and placed my office network to
192.168.254.xxx. I have yet to find a client's network where there is
254 different subnets.
 
As a matter of interest I prefer to work with 10-series, and /16 subnets.
That way I can allocate a /24 range for each purpose. Makes things a lot
easier when adding a computer or printer, since you only need to check for
used IPs in that range.

254 addresses in a /24 subnet may sound a lot but it's like the old programs
with linenumbers, if you use 1,2,3,4 then you cannot insert one into the
sequence, so it makes sense to use ranges with some free space.
 
As a matter of interest I prefer to work with 10-series, and /16 subnets.
That way I can allocate a /24 range for each purpose. Makes things a lot
easier when adding a computer or printer, since you only need to check for
used IPs in that range.

254 addresses in a /24 subnet may sound a lot but it's like the old programs
with linenumbers, if you use 1,2,3,4  then you cannot insert one into the
sequence, so it makes sense to use ranges with some free space.




- Mostrar texto de la cita -
Click to expand...

Hello, I have a similar problem in XP SP2; I have one nic pointed to
128.172.xxx.xxx for my intranet and the other one pointing to
200.44.xxx.xxx; I use the last one for internet and the first one for
my intranet; however, in order to browse my internal network, i have
to disable de 200.44.xxx.xxx; i'd like to know can they coexist
without having to disconnect one of them
 
Hello, I have a similar problem in XP SP2; I have one nic pointed to
128.172.xxx.xxx for my intranet and the other one pointing to
200.44.xxx.xxx; I use the last one for internet and the first one for
my intranet; however, in  order to browse my internal network, i have
to disable de 200.44.xxx.xxx; i'd like to know can they coexist
without having to disconnect one of them- Hide quoted text -

- Show quoted text -
Click to expand...

Your problem is completely different and should be a separate post!
 
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