On 09/26/14 14:36, Stuart Henderson wrote:
On 2014/09/26 07:42, Alexander Hall wrote:
Before performing a dhcp request, /etc/netstart explicitly takes the
interface down. As noted (by me) at g2k14, and also at work, this results
in a significant delay in getting the address.
I'm not all into enterprise switch magic, but someone hinted that this
could come from the switch reinitializing the port, with all kinds of
spanning-tree magic etc involved.
No magic - it just doesn't forward for a certain number of seconds
while it listens for incoming spanning-tree BPDUs. Switch config is
dubious though, normally you would use "switchport mode access" and
"spanning-tree portfast" or equivalent on access ports. (HP Procurve
switches have a different, less intrusive, default where they do
listen for BPDUs but only for 3 seconds, so you don't usually need
to fiddle with them).
Well, I intended to imply that it's magic to me, as I don't know what
goes on. :)
However the number of seconds being somewhere around a minute, meaning
the default config sometimes fails to get a least before going on, is
horribly annoying. Maybe I should mention this to the network guys at
work anyway.
Looking at the history of pre-dhclient ' down' in /etc/netstart
(introduced in -r1.43, 18 Sep 1998 18:42:10), I cannot see a reason
for keeping it.
This cuts 'sh /etc/netstart' time from ~minute to ~nothing at work.
OK?
Commit log was "apply media directives on dhcp interfaces" - I'm
wondering if there may be NICs that only reset media if they
are brought down+up. However if that is the case, the user could
add 'down' to the hostname.if line themselves..
I think this would only be a problem where you re-run netstart
when the system is already up; does that match your experience?
Never thought about it, but quite possible.
/Alexander
/Alexander
Index: netstart
===================================================================
RCS file: /cvs/src/etc/netstart,v
retrieving revision 1.141
diff -u -p -r1.141 netstart
--- netstart 12 Jul 2014 14:39:31 -0000 1.141
+++ netstart 26 Sep 2014 05:32:22 -0000
@@ -63,7 +63,7 @@ ifstart() {
[ "$name" = "NONE" ] && name=
[ "$mask" = "NONE" ] && mask=
[ "$bcaddr" = "NONE" ] && bcaddr=
- cmd="ifconfig $if $name $mask $bcaddr $ext1 $ext2 down"
+ cmd="ifconfig $if $name $mask $bcaddr $ext1 $ext2"
cmd="$cmd;dhclient $if"
dhcpif="$dhcpif $if"
;;
