dave@onfcanim.UUCP (Dave Martindale) (09/07/88)
We have a few new A/UX systems, configured for Berkeley networking and
NFS but not Yellow Pages.
Whenever I run a Berkeley-style networking command (rcp, remsh), there
is a delay of several seconds before anything happens. Looking at the
Ethernet wire itself, there is an initial short packet sent out, with
no reply. Four seconds later, there is suddenly a flurry of packets
exchanged and the results appear.
I don't have an Ethernet monitor, so I know when packets are sent but
not what is in them. However, it does appear that the Mac sends the
first packet, which is ignored by everybody. Then, 4 seconds later (by
the stopwatch), it sends another packet, and at that point the remote
machine responds.
Does anybody know what is going on here? Is the Mac looking for a
Yellow Pages server to look up the remote host name, even though there
is no "+" line in /etc/hosts?
There is no such delay when accessing a file via NFS, so IP and the
Ethernet hardware are not to blame. However, it does take a very long
time to mount and unmount NFS filesystems (about 4.5 seconds each),
causing me to further suspect something in the host lookup process.
The problem is definitely on the Mac somewhere - the delay is there
running any remote command to or from the Mac, but not between any
other combination of our machines.
Does anyone else run TCP and NFS without YP?
The other machines are:
VAX 11/780, 4.3BSD
IRIS 2400T, SGI 3.6 unix
IRIS CS16 SGI 4D1-3.0
Dave Martindale
{mcgill-vision,watmath}!onfcanim!daveliam@cs.qmc.ac.uk (William Roberts) (09/10/88)
In article <16077@onfcanim.UUCP> dave@onfcanim.UUCP (Dave Martindale) writes: >Does anybody know what is going on here? Is the Mac looking for a >Yellow Pages server to look up the remote host name, even though there >is no "+" line in /etc/hosts? We are all suffering from the blessed name daemon. The gethostent(3N) routines are trying to locate a nameserver by broadcasting on the network to do host lookup. This is what our monitoring system shows: (ethal) trace 10 occurrences of mymc2 packet filter-name time etdst ipsrc usport udport 0000 mymc2 0000 0x02.07.01.00.34.da aux0 1023 2049 0001 mymc2 0220 0x02.07.01.00.34.da aux0 1023 2049 0002 mymc2 0380 0x02.07.01.00.34.da aux0 1023 2049 0003 mymc2 0600 0xff.ff.ff.ff.ff.ff aux0 1086 domain 0004 mymc2 37780 0x02.07.01.00.34.da aux0 1023 2049 0005 mymc2 37900 0x02.07.01.00.34.da aux0 1023 2049 0006 mymc2 37980 0x02.07.01.00.34.da aux0 1023 2049 0007 mymc2 38180 0xff.ff.ff.ff.ff.ff aux0 1089 domain 0008 mymc2 52940 0x02.07.01.00.34.da aux0 1023 2049 0009 mymc2 53260 0xff.ff.ff.ff.ff.ff aux0 1092 domain Ok Apple - how do I turn this off? I too would like to mount NFS filesystems without hanging. >Does anyone else run TCP and NFS without YP? Yes, we do. The only people who get NFS are our undergraduate students and that's only because there machines will die if the NFS servers go down: a little YP poison can't makes things much worse. Otherwise I avoid it like the plague because its retry strategy is so awful: I don't believe that it should try forever to find a server. -- William Roberts ARPA: liam@cs.qmc.ac.uk (gw: cs.ucl.edu) Queen Mary College UUCP: liam@qmc-cs.UUCP LONDON, UK Tel: 01-975 5250