Date: Thu, 20 Jan 2011 15:38:13 +0000 (UTC) From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: Hajimu UMEMOTO <ume@freebsd.org> Cc: freebsd-net@freebsd.org, Bernd Walter <ticso@cicely7.cicely.de>, ticso@cicely.de Subject: Re: strange netstat -ian output Message-ID: <20110120153637.W3489@maildrop.int.zabbadoz.net> In-Reply-To: <ygeaaivmwaf.wl%ume@mahoroba.org> References: <20110119024431.GC39356@cicely7.cicely.de> <ygeaaivmwaf.wl%ume@mahoroba.org>
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On Fri, 21 Jan 2011, Hajimu UMEMOTO wrote: > Hi, > >>>>>> On Wed, 19 Jan 2011 03:44:31 +0100 >>>>>> Bernd Walter <ticso@cicely7.cicely.de> said: > > ticso> This is one of the blocks for this interface: > ticso> re0 1500 2a02:21e0:16e 2a02:21e0:16e0:20 0 - - 1 - - > ticso> ff02:1::2 (refs: 1) > ticso> ff02:1::d (refs: 1) > ticso> ff02:1::202 (refs: 1) > ticso> ff02:1::1:ff00:103 (refs: 1) > ticso> ff01:1::1 (refs: 1) > ticso> ff02:1::2:6214:d648(refs: 1) > ticso> ff02:1::1 (refs: 1) > ticso> ff02:1::1:ff00:7992(refs: 1) > > ticso> 2a02:21e0:16e seems to be the truncated IP. > ticso> The first line has 2a02:21e0:16e0:20 - I assume this should say 2a02:21e0:16e0:2000::103, > ticso> but it is truncated as well... > > Yes, an IPv6 address is too long for the traditional netstat output > format. :) > > ticso> Adding -W won't help on truncation. > > It seems -W is not handled, here. > > ticso> - ff02:1::2 > ticso> is not just truncated - this obviously should be ff02::2. > ticso> This '1' is part of every multicst address listed, although they > ticso> don't belong there. > ticso> By looking at systems with a large number of interfaces I came to the > ticso> conclusion that this is the scope ID, but why is it listed as part > ticso> of the IP? > > Yes, it is the internal scope address representation of the KAME IPv6 > stack. It is hided in the output of 'netstat -rn'. But, it seems not > for `netstat -ani'. There is no reason to not hide it for `netstat > -ani', IMHO. So, I've just committed to hide it: > > http://svn.freebsd.org/viewvc/base?view=revision&revision=217642 Thanks; there's also a PR somewhere about it from today or yesterday. The real problem of course is that those things are still queried by kvm(3) rather than by a real interface in which case I think the kernel shouldn't export the addresses with the scope embedded. We should make sure that with libnetstat or whatever, this will not come back. /bz -- Bjoern A. Zeeb You have to have visions! <ks> Going to jail sucks -- <bz> All my daemons like it! http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/jails.html
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