Broadcast address as default gateway?

  • Thread starter Thread starter Anders Biro
  • Start date Start date
A

Anders Biro

Hello, I got a situation where I have been assigned the address space
10.x.x.x/28 from a client and I learnt that the given default gateway
address on their side is 10.x.x.254/28
I might be wrong but is not 10.x.x.254 considered the broadcast address with
such a net mask?
Reason I ask is that the net acts very strange indeed, the connectivity goes
up and down in a very non-predictable pattern and my idea is that using the
broadcast address to default gateway might cause such peculiar behavioir?

Does this theory make sense or am I completely wrong?
/Regards
Anders
 
Anders Biro said:
Hello, I got a situation where I have been assigned the address space
10.x.x.x/28 from a client and I learnt that the given default gateway
address on their side is 10.x.x.254/28
I might be wrong but is not 10.x.x.254 considered the broadcast address with
such a net mask?
Click to expand...

No it is not the broadcast address.
This is the mask 255.255.255.224
This is the subnet breakdown:

#1 10.x.x.0 --- 10.x.x.31
#2 10.x.x.64 --- 10.x.x.95
#3 10.x.x.96 --- 10.x.x.127
#4 10.x.x.128 --- 10.x.x.159
#5 10.x.x.160 --- 10.x.x.191
#6 10.x.x.192 --- 10.x.x.223
#7 10.x.x.224 --- 10.x.x.256

The first address of each row is the Network ID, the last address is the
Broadcast Address.

--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com
-----------------------------------------------------
Understanding the ISA 2004 Access Rule Processing
http://www.isaserver.org/articles/ISA2004_AccessRules.html

Microsoft Internet Security & Acceleration Server: Guidance
http://www.microsoft.com/isaserver/techinfo/Guidance/2004.asp
http://www.microsoft.com/isaserver/techinfo/Guidance/2000.asp

Microsoft Internet Security & Acceleration Server: Partners
http://www.microsoft.com/isaserver/partners/default.asp

Deployment Guidelines for ISA Server 2004 Enterprise Edition
http://www.microsoft.com/technet/prodtechnol/isa/2004/deploy/dgisaserver.mspx
-----------------------------------------------------
 
Another simple rule is that networks always have an even number and
broadcast addresses always have an odd number.

....kurt

PS that last entry in Philip's list should have been 10.x.x.255 - A typo I'm
sure.

....kurt
 
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