Hitchhiker's Guide to Openbsd

Checking Stats on NFS
One thing to check to ensure NFS is operating properly is that all the daemons have properly registered 
with RPC. To do this, use rpcinfo(8). 
$ rpcinfo -p 10.0.0.1
program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
100005 1 udp 633 mountd
100005 3 udp 633 mountd
100005 1 tcp 916 mountd
http://www.openbsd.org/faq/faq6.html (19 of 33)9/4/2011 10:02:06 AM

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6 - Networking
100005 3 tcp 916 mountd
100003 2 udp 2049 nfs
100003 3 udp 2049 nfs
100003 2 tcp 2049 nfs
100003 3 tcp 2049 nfs
During normal usage, there are a few other utilities that allow you to see what is happening with NFS. 
One is 
showmount(8)
, which allows you to view what is currently mounted and who is mounting it. 
There is also 
nfsstat(1)
 which shows much more verbose statistics. To use showmount(8), try 
/usr/
bin/showmount -a host
. For example: 
$ /usr/bin/showmount -a 10.0.0.1
All mount points on 10.0.0.1:
10.0.0.37:/work
This output shows that the client 10.0.0.37 has mounted the 
/work
export being served from the server 
at 10.0.0.1. 
6.9 - Setting up a network bridge in OpenBSD
A 
bridge
is a link between two or more separate networks. Unlike a router, packets transfer through the 
bridge "invisibly" -- logically, the two network segments appear to be one segment to nodes on either 
side of the bridge. The bridge will only forward packets that have to pass from one segment to the other, 
so among other things, they provide an easy way to reduce traffic in a complex network and yet allow 
any node to access any other node when needed. 
Note that because of this "invisible" nature, an interface in a bridge may or may not have an IP address 
of its own. If it does, the interface has effectively two modes of operation, one as part of a bridge, the 
other as a normal, stand-alone NIC. If neither interface has an IP address, the bridge will pass network 
data, but will not be externally maintainable (which can be a feature).