I should have been more specific with my question. I agree the ancillary
data will override the setsockopt. I was really asking what happens if an
application does a setsockopt for IPV6_UNICAST_HOPS and IPV6_HOPLIMIT?
Does the IPV6_HOPLIMIT replace the value specified by the IPV6_UNICAST_HOPS
or are they separate values? Lets say IPV6_UNICAST_HOPS = x, kernel
default = z and IPV6_HOPLIMIT = y. Would 'y' be the hoplimit used for a
unicast send? Then suppose the application clears the IPV6_HOPLIMIT value.
Do we fall back to 'x' (the value specified on IPV6_UNICAST_HOPS) or 'z'
(kernel default)?
Thanks
Lori
>>>>> On Tue, 5 Jun 2001 12:45:31 -0400,
>>>>> "Lori Napoli" <[EMAIL PROTECTED]> said:
> Can someone explain how the two options IPv6_UNICAST_HOPS and
IPv6_HOPLIMIT
> work together. Does IPv6_UNICAST_HOPS override IPV6_HOPLIMIT ? And
> IPv6_HOPLIMIT overrides the system configured default?
IPV6_HOPLIMIT overrides both IPV6_UNICAST_HOPS and the system
configured default.
6.3. Specifying/Receiving the Hop Limit
The outgoing hop limit is normally specified with either the
IPV6_UNICAST_HOPS socket option or the IPV6_MULTICAST_HOPS socket
option, both of which are described in [RFC-2553]. Specifying the
hop limit as ancillary data lets the application override either the
kernel's default or a previously specified value, for either a
unicast destination or a multicast destination, for a single output
operation.
(draft-ietf-ipngwg-rfc2292bis-02.txt, which has already expired...)
JINMEI, Tatuya
Communication Platform Lab.
Corporate R&D Center, Toshiba Corp.
[EMAIL PROTECTED]
--------------------------------------------------------------------
IETF IPng Working Group Mailing List
IPng Home Page: http://playground.sun.com/ipng
FTP archive: ftp://playground.sun.com/pub/ipng
Direct all administrative requests to [EMAIL PROTECTED]
--------------------------------------------------------------------
