manpage: add info about IPv6 configuration to exports(5)

The parts of the exports(5) manpage that discuss IP addressing neglect
IPv6 configuration. Update to include info on how to export to IPv6
subnets and addresses, and add a line demonstrating that to the EXAMPLE
section.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>

diff --git a/utils/exportfs/exports.man b/utils/exportfs/exports.man
index 241b3afadd2964b09b93a38d0d05407e830ddc15..8e6f880ec02f034439faa168f5467d48cdddcbad 100644 (file)
--- a/utils/exportfs/exports.man
+++ b/utils/exportfs/exports.man
@@ -47,7 +47,7 @@ NFS clients may be specified in a number of ways:
 .IP "single host
 This is the most common format. You may specify a host either by an
 abbreviated name recognized be the resolver, the fully qualified domain
-name, or an IP address.
+name, an IPv4 address, or an IPv6 address.
 .IP "IP networks
 You can also export directories to all hosts on an IP (sub-) network
 simultaneously. This is done by specifying an IP address and netmask pair
@@ -56,8 +56,9 @@ as
 where the netmask can be specified in dotted-decimal format, or as a
 contiguous mask length.
 For example, either `/255.255.252.0' or `/22' appended
-to the network base IPv4 address results in identical subnetworks with 10 bits of
-host. Wildcard characters generally do not work on IP addresses, though they
+to the network base IPv4 address results in identical subnetworks with 10 bits
+of host. IPv6 addresses must use a contiguous mask length. Wildcard characters
+generally do not work on IP addresses, though they
 may work by accident when reverse DNS lookups fail.
 .IP "wildcards
 Machine names may contain the wildcard characters \fI*\fR and \fI?\fR.
@@ -486,6 +487,7 @@ The format for extra export tables is the same as
 /home/joe       pc001(rw,all_squash,anonuid=150,anongid=100)
 /pub            *(ro,insecure,all_squash)
 /srv/www        \-sync,rw server @trusted @external(ro)
+/foo            2001:db8:9:e54::/64(rw) 192.0.2.0/24(rw)
 '''/pub/private    (noaccess)
 .fi
 .PP
@@ -501,7 +503,8 @@ option in this entry also allows clients with NFS implementations that
 don't use a reserved port for NFS.
 The sixth line exports a directory read-write to the machine 'server'
 as well as the `@trusted' netgroup, and read-only to netgroup `@external',
-all three mounts with the `sync' option enabled.
+all three mounts with the `sync' option enabled. The seventh line exports
+a directory to both an IPv6 and an IPv4 subnet.
 ''' The last line denies all NFS clients
 '''access to the private directory.
 '''.SH CAVEATS