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When specifying an NFS mountpoint in /etc/fstab, what's the purpose of the addr option? For example:

192.168.1.5:/home         /home                   nfs     rw,addr=192.168.1.5 0 0
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It can specify the client address to use when the client has multiple subnet IPs on an interface and traversing the same routes (think aliased eth0:1, bond0:2, etc.). Typically in this situation you'd put the NFS server on another interface/subnet to avoid the whole problem but in large network installations things can get messy.

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Looking at the man page for mount (http://linux.die.net/man/8/mount). It appears as though that option is accepted but ignored. I could not find any other information on it.

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I suspect it is to be used for multi-homed installations; so that you can specify which IP address local to the server to use as a source. E.g. run the NFS traffic over an internal network, rather than a public interface. – dezwart Apr 9 '10 at 3:40
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I believe NFS uses it internally, you see it in /proc/mounts even when not specified.

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