From: Brian Haley <brian.haley@hp.com>
To: rdenis@simphalempin.com
Cc: Andrew Morton <akpm@osdl.org>, netdev@vger.kernel.org
Subject: Re: Fw: [Bugme-new] [Bug 7665] New: getsockopt(IPV6_*CAST_HOPS) returns -1
Date: Mon, 11 Dec 2006 16:55:55 -0500 [thread overview]
Message-ID: <457DD3EB.9030201@hp.com> (raw)
In-Reply-To: <20061211095623.09fb0c40.akpm@osdl.org>
Andrew Morton wrote:
> Where fd is a socket (datagram or raw) with IPv6 protocol family,
> getsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, ...) succeeds, but the returned
> hop limit is -1. connect()'ing the socket first does not solve the problem.
An IPv6 socket's hoplimit value is not set at creation time, instead,
the hoplimit in an outgoing packet is set dynamically at transmit time
to one of the following (in this order):
1. Hoplimit route metric (if set)
2. Outgoing interface value (/proc/sys/net/ipv6/conf/ethX/hop_limit)
3. Global IPv6 value (/proc/sys/net/ipv6/conf/all/hop_limit)
A setsockopt() value *will* override this.
Some *nixes have a different behavior and do set it at socket() creation
time.
-Brian
next prev parent reply other threads:[~2006-12-11 21:55 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-11 17:56 Fw: [Bugme-new] [Bug 7665] New: getsockopt(IPV6_*CAST_HOPS) returns -1 Andrew Morton
2006-12-11 21:55 ` Brian Haley [this message]
2006-12-12 8:08 ` Rémi Denis-Courmont
2006-12-12 21:16 ` Brian Haley
2006-12-12 22:38 ` Rémi Denis-Courmont
2006-12-13 1:11 ` David Miller
2006-12-13 17:28 ` Brian Haley
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