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Internet Message Format  |  1992-11-17  |  2.1 KB
  1. Path: sparky!uunet!stanford.edu!agate!dog.ee.lbl.gov!lbl.gov!vxwexplo
  2. From: wdf%ukfca1@sj.ate.slb.com
  3. Newsgroups: comp.os.vxworks
  4. Subject: re: Ethernets and backplane networks
  5. Date: Tue, 17 Nov 92 09:32:27 GMT
  6. Organization: Lawrence Berkeley Laboratory, Berkeley CA
  7. Lines: 33
  8. Sender: vxwexplo@lbl.gov
  9. Message-ID: <9211170932.AA24316@pickle.uk.ate.slb.com>
  10. NNTP-Posting-Host: 128.3.112.16
  11. Originator: daemon@vxw.ee.lbl.gov
  12.  
  13. Mike Anderson replied to my questions about using up internet network 
  14. numbers (with 'private' ethernets for VxXorks crates and backplane 
  15. networks) with a fairly comprehensive posting about subnets. I have
  16. a further question on that subject: do the subnets have to be physically
  17. connected ?  Ie. could the subnets be arranged as follows where the
  18. subnets have netmask 0xffffffc0:
  19.  
  20.                     Internet G/W             Main Ethernet (not subnetted)
  21. Internet ----------[192.9.200.1]----------------------------------------------
  22. (sees only                       |                |
  23.  net 192.9.200.0)                |                |
  24.                          ---------------   ---------------
  25.     Suns w/ 2 Enets  [ 192.9.200.2 ]   [ 192.9.200.3 ] <- main Enet
  26.              [ 192.9.201.1 ]   [ 192.9.201.64] <- subnetted Enet
  27.                          ---------------   ---------------
  28.                                  |                |
  29.                                  |                |
  30.            (00 sub-network)  ---------            |
  31.                                               ----------  (01 sub-network)
  32.  
  33. I would guess that the problem may be that each Sun could only have one
  34. netmask, and for the above configuration it would need a different one for
  35. the main network (192.9.200) and the sub-netted network (192.9.201).
  36.  
  37. Bill
  38.  
  39. -----------------------------------------------------------------------------
  40. Bill Frewing
  41. Schlumberger Technologies               Phone: +44 (202) 893535
  42. Ferndown Industrial Estate              Fax:   +44 (202) 897097
  43. Wimborne, Dorset, BH21 7PP              Email: wdf@ukfca1.uk.ate.slb.com
  44. United Kingdom
  45. -----------------------------------------------------------------------------
  46.