This is a multi-part message in MIME format.

------=_NextPart_000_00B7_01C5D4A6.47775630
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

Hi,

It is very consistent with the behaviour I've also observed.

I'll try the patch and send my observations...

Konstantin
=20

-----
> De=A0: current-users-owner@NetBSD.org [mailto:current-users-
> owner@NetBSD.org] De la part de Steven M. Bellovin
> Envoy=E9=A0: mercredi 19 octobre 2005 02:02
> =C0=A0: David Young
> Cc=A0: current-users@NetBSD.org; perry@piermont.com
> Objet=A0: Re: ath seems still buggy
>=20
> In message <20051018230552.GW1513@che.ojctech.com>, David Young =
writes:
> >
> >--SCOJXUq1iwCn05li
> >Content-Type: text/plain; charset=3Dus-ascii
> >Content-Disposition: inline
> >
> >On Tue, Oct 18, 2005 at 05:00:52PM -0400, Steven M. Bellovin wrote:
> >> Sometimes, it works very well; in my house over the weekend (two =
access
> >> points, with WEP), it worked flawlessly.  Other places, it's worked
> >> poorly or not at all, so much so that I'm contemplating starting to
> >> travel with a wi card again.
> >
> >Steve,
> >
> >I think I have figured it out by re-reading some logs Perry sent me.
> >I will tell you what I think is happening.  When ath(4) doesn't =
receive
> >the AP's beacon for a while, it times out and tries to reassociate =
with
> >the AP.  In a zone where there's 802.11 congestion, your ath might
> >miss a lot of beacons and time-out often.  Congestion may also cause
> >reassociation to fail.  If reassociation fails, then ath will scan
> >for access points again.  This is where things go haywire: a bug in
> >the scanning code makes ath disregard your AP, because it failed to
> >associate with it, until the AP is flushed from the scan table with
> >ifconfig down/up.
>=20
> That is certainly very consistent with what I've observed.
>=20
> >
> >You and Perry should try this patch.
> >
> I leave on a trip tomorrow, which means that I'll build a kernel with
> that patch but *not* install it...
>=20
> >
> >--
> >David Young             OJC Technologies
> >dyoung@ojctech.com      Urbana, IL * (217) 278-3933
> >
> >--SCOJXUq1iwCn05li
> >Content-Type: text/plain; charset=3Dus-ascii
> >Content-Disposition: attachment; filename=3Dscan-patch
> >
> >Index: ieee80211_node.c
> =
>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> >RCS file: /cvsroot/src/sys/net80211/ieee80211_node.c,v
> >retrieving revision 1.44
> >diff -u -u -r1.44 ieee80211_node.c
> >--- ieee80211_node.c	25 Sep 2005 00:03:06 -0000	1.44
> >+++ ieee80211_node.c	18 Oct 2005 22:18:24 -0000
> >@@ -619,7 +619,7 @@
> > ieee80211_end_scan(struct ieee80211com *ic)
> > {
> > 	struct ieee80211_node_table *nt =3D &ic->ic_scan;
> >-	struct ieee80211_node *ni, *selbs;
> >+	struct ieee80211_node *next_ni, *ni, *selbs;
> >
> > 	ieee80211_cancel_scan(ic);
> > 	ieee80211_notify_scan_done(ic);
> >@@ -707,7 +707,8 @@
> > 	IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "\t%s\n",
> > 	    "macaddr          bssid         chan  rssi rate flag  wep
> essid");
> > 	IEEE80211_NODE_LOCK(nt);
> >-	TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
> >+	for (ni =3D TAILQ_FIRST(&nt->nt_node); ni !=3D NULL; ni =3D =
next_ni) {
> >+		next_ni =3D TAILQ_NEXT(ni, ni_list);
> > 		if (ni->ni_fails) {
> > 			/*
> > 			 * The configuration of the access points may change
> >@@ -718,11 +719,8 @@
> > 				"%s: skip scan candidate %s, fails %u\n",
> > 				__func__, ether_sprintf(ni->ni_macaddr),
> > 				ni->ni_fails);
> >-			ni->ni_fails++;
> >-#if 0
> > 			if (ni->ni_fails++ > 2)
> > 				ieee80211_free_node(ni);
> >-#endif
> > 			continue;
> > 		}
> > 		if (ieee80211_match_bss(ic, ni) =3D=3D 0) {
> >
> >--SCOJXUq1iwCn05li--
> >
>=20
>=20
> 		--Steven M. Bellovin, http://www.cs.columbia.edu/~smb
>=20


------=_NextPart_000_00B7_01C5D4A6.47775630
Content-Type: application/x-pkcs7-signature;
	name="smime.p7s"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
	filename="smime.p7s"
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------=_NextPart_000_00B7_01C5D4A6.47775630--