Solved

Dual Networks cards / connecting to seperate networks

Posted on 2011-03-04
5
251 Views
Last Modified: 2012-05-11
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.
0
Comment
Question by:PMCmikem
  • 3
  • 2
5 Comments
 
LVL 34

Accepted Solution

by:
Paul MacDonald earned 500 total points
ID: 35039164
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.
0
 

Author Closing Comment

by:PMCmikem
ID: 35039279
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
0
 

Author Comment

by:PMCmikem
ID: 35039295
Just to inform I chnaged the Subnet Mask on Network B to 255.255.0.0.  I can now ping both networks.
0
 
LVL 34

Expert Comment

by:Paul MacDonald
ID: 35039313
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.
0
 
LVL 34

Expert Comment

by:Paul MacDonald
ID: 35039319
Right, okay so now network A is 1.0.0.0 and network B is 1.34.0.0.  Two different network numbers.
0

Featured Post

Three Reasons Why Backup is Strategic

Backup is strategic to your business because your data is strategic to your business. Without backup, your business will fail. This white paper explains why it is vital for you to design and immediately execute a backup strategy to protect 100 percent of your data.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

We have adopted the strategy to use Computers in Student Labs as the bulletin boards. The same target can be achieved by using a Login Notice feature in Group policy but it’s not as attractive as graphical wallpapers with message which grabs the att…
Today, still in the boom of Apple, PC's and products, nearly 50% of the computer users use Windows as graphical operating systems. If you are among those users who love windows, but are grappling to keep the system's hard drive optimized, then you s…
Microsoft Active Directory, the widely used IT infrastructure, is known for its high risk of credential theft. The best way to test your Active Directory’s vulnerabilities to pass-the-ticket, pass-the-hash, privilege escalation, and malware attacks …
Two types of users will appreciate AOMEI Backupper Pro: 1 - Those with PCIe drives (and haven't found cloning software that works on them). 2 - Those who want a fast clone of their boot drive (no re-boots needed) and it can clone your drive wh…

773 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question