Erik and Sandeep,
Have a look at RFC 4861 (it obsoletes RFC 2461). The use of the Router
Lifetime variable is clarified:
Router Lifetime
16-bit unsigned integer. The lifetime associated
with the default router in units of seconds. The
field can contain values up to 65535 and receivers
should handle any value, while the sending rules
in
Section 6 limit the lifetime to 9000 seconds. A
Lifetime of 0 indicates that the router is not a
default router and SHOULD NOT appear on the
default
router list. The Router Lifetime applies only to
the router's usefulness as a default router; it
does not apply to information contained in other
message fields or options. Options that need time
limits for their information include their own
lifetime fields.
Best Regards,
Jeffrey Dunn
Info Systems Eng., Lead
MITRE Corporation.
-----Original Message-----
From: Erik Kline [mailto:[EMAIL PROTECTED]
Sent: Friday, January 04, 2008 4:00 AM
To: Sandeep P A
Cc: ipv6@ietf.org
Subject: Re: Router Lifetime: max value to be accepted by a host
Why exactly would a host discarding an ra lifetime > 9000 be in
violation? It seems that the host can either (a) discard it, or (b)
interpret ra lifetimes > 9000 as = 9000. The latter seems sensible
enough offhand, though I haven't given it much thought...
On 12/19/07, Sandeep P A <[EMAIL PROTECTED]> wrote:
>
>
>
>
> RFC 2461:
>
> Host Description:
>
> 4.2. Router Advertisement Message Format
>
> Router Lifetime
>
> 16-bit unsigned integer. The lifetime associated with the default
router in
> units of seconds. The maximum value corresponds to 18.2 hours. A
Lifetime of
> 0 indicates that the router is not a default router and SHOULD NOT
appear on
> the default router list. The Router Lifetime applies only to the
router's
> usefulness as a default router; it does not apply to information
contained
> in other message fields or options. Options that need time limits for
their
> information include their own lifetime fields.
>
> Router Description:
>
> 6.2.1. Router Configuration Variables
>
> AdvDefaultLifetime
>
> The value to be placed in the Router Lifetime field of Router
Advertisements
> sent from the interface, in seconds. MUST be either zero or between
> MaxRtrAdvInterval and 9000 seconds. A value of zero indicates that
the
> router is not to be used as a default router.
>
> Default: 3 * MaxRtrAdvInterval
>
>
>
> When sending RA the maximum lifetime that can be advertised is 9000
seconds,
> but when receiving the RA in Host, RFC does not specify
>
> any limit other than 18.2 hr(65535 ushort max value).
>
> A router sending RA with a lifetime of more than 9000 seconds is an
RFC
> violation. But at the same time a host discarding such an RA is also
RFC
> violation
>
> Please guide me in this regard...
>
> Regards,
> Sandeep
>
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