RE: Scope Issue

[Girish Kamath]

Hello Shuki,

   ND messages are always sent with a hop-limit of 255. So a router is not supposed to forward a ND packet recieved.Thus ND messages are restricted over a single link.So i can't see a scenario when a ND message will be forwarded by a gateway.

  You said that NS message always uses a link-local address as a source address. Is it true even when a node is configured with global unicast addresses. Taking our example if we have node A which is configured with both link-local and global unicast address can node A form a NS message with  link-local as source address and destination as global unicast address to refresh its neighbor cache.


"sasson, shuki" <[EMAIL PROTECTED]> wrote:

Hi Girish,  you probably refer to Neighbor Solicitation message which is always using link locals as a source address. That would be possible. However pay attention to the following fact.

When you send a message using a link local address as a source address this message cannot pass a gateway. For that you will need a global unicast address.

 

Shuki

 

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Girish Kamath
Sent: Thursday, May 06, 2004 11:59 AM
To: [EMAIL PROTECTED]
Subject: Scope Issue

 

Hello,
      For Neighbor Discovery messages, is it mandatory that the scope of the source and destination address should match?
If i have just a link-local unicast address on a node A connected to another node B which has global unicast addresses configured, can i form a ND message with source address as link-local unicast address and destination address as global unicast address when sending a ND packet from A to B.

 

-- Girish

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