Solved

Dual Networks cards / connecting to seperate networks

Posted on 2011-03-04
5
249 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 33

Accepted Solution

by:
paulmacd 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 33

Expert Comment

by:paulmacd
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 33

Expert Comment

by:paulmacd
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

Backup Your Microsoft Windows Server®

Backup all your Microsoft Windows Server – on-premises, in remote locations, in private and hybrid clouds. Your entire Windows Server will be backed up in one easy step with patented, block-level disk imaging. We achieve RTOs (recovery time objectives) as low as 15 seconds.

Join & Write a Comment

Suggested Solutions

If your system is showing symptoms of browser hijacks or 'google search redirects' check out my other article (http://rdsrc.us/u3GP7A) first and run the tool TDSSKiller (http://rdsrc.us/GDBBs4) to get rid of the infection. Once done, and if the …
It is only natural that we all want our PCs to be in good working order, improved system performance, so that is exactly how programs are advertised to entice. They say things like:            •      PC crashes? Get registry cleaner to repair it!    …
Sending a Secure fax is easy with eFax Corporate (http://www.enterprise.efax.com). First, Just open a new email message.  In the To field, type your recipient's fax number @efaxsend.com. You can even send a secure international fax — just include t…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.

708 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

Need Help in Real-Time?

Connect with top rated Experts

20 Experts available now in Live!

Get 1:1 Help Now