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Thanks for your help. Olivier F5MZN and Laurent F6FVY

Task #337 — Default broadcast address not calculated properly for 10.0.0.5 with subnet mask 255.255.255.0

Attached to Project— Win-Test
Opened by Robert A. Wilson (N6TV) - Wednesday, 4 Dec 2013, 9:02am
Bug Report
Setup
Unconfirmed
No-one
All
Medium
Normal
Current WT-4.x
Undecided
0% complete

WT 4.11.0

On a machine where IPCONFIG returns:

Ethernet adapter Ethernet LAN:

IPv4 Address. . . . . . . . . . . : 10.0.0.3 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 10.0.0.1

  1. Type SETUP [Enter] in the Win-Test logging window
  2. Check "Enable Ethernet Network"
  3. Next to "Broadcast address", click the "By Default" button

Win-Test changes the broadcast address to 10.255.255.255, but this doesn't seem to work.

According to the Online IP Subnet Calculator (http://www.subnet-calculator.com/subnet.php?net_class=A)

with the Subnet mask set to 255.255.255.0, the correct broadcast address is 10.0.0.255. Manually setting this broadcast address in Win-Test SETUP seems to work fine; all computers on the LAN will talk to each other OK.

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Comment by F6FVY - Wednesday, 4 Dec 2013, 10:09pm

Win-Test is not aware of the subnet mask used. It is assumed from the class the of private network indicated by the IP. A 10.x.y.z address is supposed to be on a class A network whose default netmask is 255.0.0.0, allowing 16 777 216 computers. A nice M/M setup...

Comment by Robert A. Wilson - Wednesday, 4 Dec 2013, 10:49pm

Unfortunately one of the most common cable modem / router boxes now shipping in the USA (by Comcast) assigns itself to the private network 10.0.0.1 by default, with the netmask shown above. For 192.168.0.1 routers, it all works OK as-is.

Perhaps the "by default" button should just take the IP address x.x.x.y and use x.x.x.255 as the default broadcast address?