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Add routes  in AIX

Posted on 2012-03-16
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Last Modified: 2012-03-16
My netstat -rn command is missing the following routes

10.10.208/20       10.20.212.5       UG        0       108 en5      -      -
10.20.5/24         10.20.212.5       UG        0         0 en5      -      -
10.20.208/20       10.20.212.5       UG       19  80062293 en5      -      -
10.20.212.0        10.20.213.99      UHSb      0         0 en5      -      -   =>
10.20.212/23       10.20.213.99      U       185 116521684 en5      -      -


How do I add the routes ...????
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Question by:mnis2008
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3 Comments
 
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by:woolmilkporc
ID: 37731525
I think  you mean adding a route which will last across reboots?

The easiest way is certainly

"smitty mkroute"

Fill in the required values for

Destination TYPE  (net in your case)
DESTINATION Address (10.10.208 in your first example)
Default GATEWAY Address (10.20.212.5)
Network MASK (255.255.240.0)

Or use the

chdev -l inet0 -a route=...

command.

wmp
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Author Comment

by:mnis2008
ID: 37731546
how did we know that the network mask is 255.255.240.0 , I am more interested in knowing where did 240 came from..Can you please explain
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woolmilkporc earned 500 total points
ID: 37731579
Your mask  in CIDR notation is /20.

This is the replacement notation for the traditional decimal notation and simply means the number of significant bits (i.e. bits from the left to the right).

So in order to transform "20" to the 4-byte decimal notation we have

20 bits = 8 bits + 8 bits + 4 bits + 0 bits, which is binary
11111111 11111111 11110000 00000000

or hex
FF FF F0 00

or decimal, written in 4 blocks
255 (128+64+32+16+8+4+2+1)
255 (128+64+32+16+8+4+2+1)
240 (128+64+32+16+0+0+0+0)
    0 (0+0+0+0+0+0+0)

This is RFC 1878, a "memo" RFC issued for clarification purposes:

http://www.ietf.org/rfc/rfc1878.txt

wmp
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