Switch the default NFS mount mode from UDP to TCP. UDP mounts are a

historical relic, and are no longer appropriate for either LAN or WAN
mounting.  At modern (gigabit and 10 gigabit) LAN speeds packet loss
from socket buffer fill events is common, and sequence numbers wrap
quickly enough that data corruption is possible.  TCP solves both of
these problems without imposing significant overhead.

MFC after:     1 month

1 files changed, 6 insertions, 0 deletions

diff --git a/UPDATING b/UPDATING
index 24e8cd1..10ea7e3 100644
--- a/UPDATING
+++ b/UPDATING
@@ -22,6 +22,12 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 8.x IS SLOW:
 	to maximize performance.  (To disable malloc debugging, run
 	ln -s aj /etc/malloc.conf.)
 
+20080211:
+	The default NFS mount mode has changed from UDP to TCP for
+	increased reliability.  If you rely on (insecurely) NFS
+	mounting across a firewall you may need to update your
+	firewall rules.
+
 20080208:
 	Belatedly note the addition of m_collapse for compacting
 	mbuf chains.