non operational question related to IP

Steven Bellovin smb at cs.columbia.edu
Mon Nov 22 13:58:34 CST 2010


On Nov 22, 2010, at 2:52 52PM, Greg Whynott wrote:

> 
> i was pinging a host from a windows machine and made a typo which seemed harmless.  the end result was it interpreted my input differently than what I had intended.   thinking this was a m$ issue I quickly took the opportunity to poke fun at windows as the senior m$ admin was near by.
> 
> "look at how brain dead this os is,  it can't even do simple math!"
> 
> He is now looking at my screen scratching his head…..
> 
> "watch,  i'll open a shell on os x and show you how it can add 0 +10"
> 
> I open a shell on os x,  same behavior as windows.
> 
> " ok so apple is brain dead too,  watch,  it'll work on linux!"
> 
> same deal…
> 
> 
> long story short,  it does work as expected on all our hardware routing gear.    still not sure what is happening here…
> 
> 
> osx-gwhynott:~ gwhynott$ ping 10.010.10.1
> PING 10.010.10.1 (10.8.10.1): 56 data bytes
> 
> 
> gwhynott at ops:~$ ping 10.010.10.1
> PING 10.010.10.1 (10.8.10.1) 56(84) bytes of data.
> 
> 
> CORE1>ping 10.010.10.1
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 10.10.10.1, timeout is 2 seconds:
> !!!!!
> 
> 
> anyone happen to know how the OS's are interpreting the 010?   doesn't appear work out in base[2-10] (1010,101,22,20,14,13,12,11,10,A)
> 


010 is how C represents an octal number.  This one is known in decimal as 8.  


$ bc
bc 1.06
Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'. 
ibase=8
10
8


		--Steve Bellovin, http://www.cs.columbia.edu/~smb









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