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tag:
type: ipv4
help: Set a static ARP translation
val_help: IPv4 destination address
#
# All the work is done here in the "end:" tag. There are four possible cases:
#
# 1) A new node and possibly sub-tree with hwaddr has been created
# 2) Value of hwaddr node in sub-tree has been changed
# 3) The hwaddr node in sub-tree has been deleted
# 4) This node (and hence entire sub-tree) has been deleted
#
# The flow is the same in all cases. First, we delete any
# previous static ARP translation that may be in place for this
# IP addr. This will typically fail in case (1) and in case (4) if the
# hwaddr node had been previously deleted. Then, if a hwaddr is defined,
# we add a new startic ARP translation for this IP addr pointing to that
# hwaddr. This should always succeed, so we don't try to hide error
# messages from the user.
#
# We always force a successful return in order to prevent transient
# failures of the "arp" command from failing the commit.
#
end:
ipaddr=$VAR(@)
hwaddr=$VAR(hwaddr/@)
/usr/sbin/arp -d $ipaddr > /dev/null
if [ -n "$hwaddr" ]; then
/usr/sbin/arp -s $ipaddr $hwaddr
fi
exit 0
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