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Re: Regarding the pointer field in LSSR options of IP packet.

2000-06-06 00:20:02
Shankar Agarwal <ashankar(_at_)cisco(_dot_)com> wrote:

Can anyone tell me why the minimum value of the pointer in the LSSR option
is 4. It says that it points to the next address with respect to the option
field. Then shouldn't it be 3 (option type + length + pointer) rather then 4.
Similarly for the pointer in the timestamp option it says that
"The Pointer is the number of octets from the beginning of this
option to the end of timestamps plus one (i.e., it points to the
octet beginning the space for next timestamp).  The smallest
legal value is 5.  The timestamp area is full when the pointer
is greater than the length."

The pointers are 1-based, i.e., a pointer value of 1 would point to the
option type.

//cmh