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Re: Network issue........

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On Tue, Sep 13, 2016 at 07:07:51AM -0400, rhkramer@gmail.com wrote:
>On Tuesday, September 13, 2016 04:54:08 AM Darac Marjal wrote:
>> On Tue, Sep 13, 2016 at 04:26:55PM +1000, Charlie wrote:
>> >Kernel IP routing table
>> >Destination Gateway  Genmask Flags MSS Window irtt Iface
>> >0.0.0.0       10.80.2.85  0.0.0.0     UG     0    0          0 eth0
>> >10.80.2.84  0.0.0.0  255.255.255.252 U  0    0          0 eth0
>>
>> This translates as "For 10.80.2.84 to 10.80.2.87, talk directly to the
>> host, otherwise gateway through 10.80.2.85".
>
>I'm not the OP, but maybe I can learn something.
>
>I can sort of see where you got the 10.80.2.84--oh, and I was going to say
>that I don't see where the 10.80.2.87 came from, but, without doing the math,
>maybe that comes from the 255.255.255.252 netmask?

Yes. I actually plugged the numbers into 
http://www.subnet-calculator.com/ as I'm lazy, but 255.255.255.252 is 
also written as /2 and it defines a subnet where everything but the last 
2 bits of the address are the same. We're lucky that, in this instance 
10.80.2.84 is on the lower boundary of this range (Actually, the routing 
table might enforce that), so the next 4 (inclusive) hosts make up the 
range .84 (which would usually be the 'network' address), .85 and .86 
(which are both 'usable' hosts) and .87 (which would be the 'broadcast' 
address).


>

-- 
For more information, please reread.

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Thread

Network issue........ Charlie <ariestao1@ipstarmail.com.au> - 2016-09-13 08:30 +0200
  Re: Network issue........ Darac Marjal <mailinglist@darac.org.uk> - 2016-09-13 11:00 +0200
    Re: Network issue........ rhkramer@gmail.com - 2016-09-13 13:10 +0200
      Re: Network issue........ Erwan David <erwan@rail.eu.org> - 2016-09-13 13:30 +0200
      Re: Network issue........ Darac Marjal <mailinglist@darac.org.uk> - 2016-09-13 13:30 +0200
    Re: Network issue........ Charlie <ariestao1@ipstarmail.com.au> - 2016-09-13 13:40 +0200
  Re: Network issue........ Fabrizio Carrai <fabrizio.carrai@gmail.com> - 2016-09-13 13:10 +0200
  Re: Network issue........ Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2016-09-13 18:00 +0200
    Re: Network issue........ Charlie <ariestao1@ipstarmail.com.au> - 2016-09-14 01:10 +0200
      Re: Network issue........ "Neal P. Murphy" <neal.p.murphy@alum.wpi.edu> - 2016-09-14 01:20 +0200
        Re: Network issue........ Charlie <ariestao1@ipstarmail.com.au> - 2016-09-14 01:50 +0200
          Re: Network issue........ "Neal P. Murphy" <neal.p.murphy@alum.wpi.edu> - 2016-09-14 02:00 +0200

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