Greg Daley wrote:
For MTU, it's clear that you need to take the smallest
(most restrictive) value advertised. This is because
choice of a higher MTU is likely to have worse effects
than
I think this needs a bit of refinement. For multicast RAs (both unsolicited and solicited), the MTU option gives an indication of how much the router itself can accept - presumably as a reflection of the router's attached link MTU, router buffer restrictions, etc. For unicast, solicited RAs, however, the MTU option gives an indication of how much the forward path from the soliciter to the router can accept.
Since the L2 switches/bridges/etc. on the paths between a soliciter and its candidate routers may be quite different, it seems reasonable that the soliciter might want to store different MTUs reported by different routers in solicited unicast RAs.
Fred [EMAIL PROTECTED]
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