Allow specific source address/interface for outgoing traffic

[Ulrich Windl]

For multi-homed hosts it's not always clear which outgoing interface (which source address) will be used when a packet to test some remote service is being sent. A way to specify which local IP address (which interface) to use when creating traffic would be very much appreciated. In environments with firewalls, the source address may decide whether some packet arrives, or not. So this feature seems to be rather useful.

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fix Issue #276: Allow specific source address for port and ping tests.

Example:

    if failed ping via address "192.168.1.10" then alert
    if failed port 80 via address "192.168.1.10" then alert

→ <<cset 435d20add849>>

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Removing version: 5.15 (automated comment)

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Issue #820 was marked as a duplicate of this issue.