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Dual Networks cards / connecting to seperate networks

I have a single pc with 2 ethernet cards (call then A & B).  The computer is running Windows XP Pro.  I have connected each ethernet card to a seperate network.  Ethernet A is set to DHCP and Ethernet B has a static IP Address.  Ethernet A get an DHCP address of: 1.1.0.206 (IP), 255.0.0.0 (SM), 1.1.0.1 (DG).  Ethernet B is static is: 1.34.67.2 (IP), 255.0.0.0 (SM).  

I can ping all deives on Ethernet A, but cannot ping anything on Ethernet B.  There are only currenty two devices on B's network, both have 1.34.67.x ip addresses.  On of the devices is a switch that has its default gateway set to itself.

Can anyone tell me what I am doing wrong here that I cannot communicate with the devices on B?  Let me know if you need any other information?  Sorry if I left any important information out I am kind of new this Dual networks cards and seperate networks.
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Michael McGuire
Asked:
Michael McGuire
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1 Solution
 
Paul MacDonaldDirector, Information SystemsCommented:
Since both NICS have a subnet mask of 255.0.0.0, they're on the same logical network.  Change the subnet mask of one or both in order for your setup to work.
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Michael McGuireSystems AdministratorAuthor Commented:
Thanks thats worked.  I hate to ask a dumb question, but can you explain why that worked?  You don't have to go into great detail, I just want to better understand the solution
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Michael McGuireSystems AdministratorAuthor Commented:
Just to inform I chnaged the Subnet Mask on Network B to 255.255.0.0.  I can now ping both networks.
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Paul MacDonaldDirector, Information SystemsCommented:
The subnet mask defines what portion of the IP address identifies the network and what portion of the IP address defines the computer.

Your subnet mask (255.0.0.0) masked both IP addresses to network 1.0.0.0 so traffic to either network probably just went out the preferred NIC (NIC A).  Changing the subnet mask on NIC B (which is what I presume you did) pushed it to a different network number.  What that network number is depends on what subnet mask you used.
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Paul MacDonaldDirector, Information SystemsCommented:
Right, okay so now network A is 1.0.0.0 and network B is 1.34.0.0.  Two different network numbers.
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