Subject: Simple question re. DNS label compression

From: Richard Johnson <[email-masked]>
Date: Wed, 9 Feb 2005 13:16:55 -0800

Simple question:  Can a DNS domain name, which is using label 
compression, have multiple levels of indirect pointers?  For example:

+---------------------------+
|  1   | "a"  |  4   | "t"  |
+---------------------------+
| "e"  | "s"  | "t"  |   3  |
+---------------------------+
| "c"  | "o"  | "m"  |   0  |
+---------------------------+
|  1   | "b"  | 0xc0 | 0x7  |
+---------------------------+
| "c"  | 0xc0 | 0xc  |   0  |
+---------------------------+

So, assuming I have coded this correctly:

1) the first label here is "a.test.com" in the the simple fashion.
2) the second label after it would be "b.com" following the "0xc007" 
indirect pointer
3) the third label after it would be "c.b.com" following first the 
"0xc00c" indirect pointer and then the "0xc007" indirect pointer.

Thanks for your time!

/raj

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