Date: Tue, 21 Aug 2012 21:15:08 -0600 From: Warner Losh <imp@bsdimp.com> To: Slawa Olhovchenkov <slw@zxy.spb.ru> Cc: Ian Lepore <freebsd@damnhippie.dyndns.org>, Lev Serebryakov <lev@FreeBSD.org>, freebsd-current@freebsd.org Subject: Re: r239356: does it mean, that synchronous dhcp and dhcplcinet with disabled devd gone? Message-ID: <835A0305-C273-402A-826E-C2A87BD062F8@bsdimp.com> In-Reply-To: <20120821230037.GE88729@zxy.spb.ru> References: <1049151425.20120821190433@serebryakov.spb.ru> <1345562163.27688.347.camel@revolution.hippie.lan> <709115163.20120821192652@serebryakov.spb.ru> <1345564507.27688.354.camel@revolution.hippie.lan> <1409150425.20120821210152@serebryakov.spb.ru> <1345570590.27688.367.camel@revolution.hippie.lan> <686419050.20120821214225@serebryakov.spb.ru> <B9382A54-A00C-4FDE-9A52-939BB3BE12E2@bsdimp.com> <1345585084.27688.377.camel@revolution.hippie.lan> <1844966139.20120822023623@serebryakov.spb.ru> <20120821230037.GE88729@zxy.spb.ru>
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On Aug 21, 2012, at 5:00 PM, Slawa Olhovchenkov wrote: > On Wed, Aug 22, 2012 at 02:36:23AM +0400, Lev Serebryakov wrote: >=20 >> Hello, Ian. >> You wrote 22 =C1=D7=C7=D5=D3=D4=C1 2012 =C7., 1:38:04: >>=20 >> IL> For example, this script can replace devd as a daemon that = restarts >> IL> dhclient when any link comes back up... >>=20 >> IL> Of course the right thing to do is invoke the proper rc scripts = rather >> IL> than dhclient directly... this is just to illustrate how easy it = is to >> IL> replace devd if your needs are specialized. >> [sigh] >> Everything worked with 8.x without problems. It worked with 9.x and = -CURRENT >> with adding of ``synchronous_dhclient=3D"YES"'' into /etc/rc.conf = (And >> it cost me about 2 hours of investigation, why dhclient stops to >> start after upgrade). Next I'll need to write some script. Is it Ok >> to you? >>=20 >> Yes, I understand problem with laptops, which change wire and >> wireless networks and need to re-acquire new address. But it should >> be soleved other way. And jhb@ already posted proper solution, BTW! >>=20 >> And, as side note, ``man rc.cof'' says NOTHING about relation of = devd >> and ``synchronous_dhclient'' setting! It says about ``start >> dhclient(8) synchronously at startup'' without explaining, that >> without this option and with devd disabled, dhclient WILL NOT START >> AT ALL! And relations between devd and dhclient are not documented at >> all in: rc.conf(5), dhclient(8), devd.conf(5) and devd(8). >=20 > Time ago synchronous_dhclient is waiting for obtain IP by dhcpclient. > w/o synchronous_dhclient and ifconfig_bge0=3D"DHCP" dhcpclient run in > background and don't paused boot while obtaining IP address. > On perinterface basis: ifconfig_bge0=3D"SYNCDHCP" or = ifconfig_bge0=3D"NOSYNCDHCP" >=20 > Background start of dhcpclient currently by devd, on UP event on > ethernet interface. This introduction in 6.2. 2006-08-22. This is why monkeying with default behavior and not documenting changes = are both bad ideas. Warner
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