Werk #13519: check_icmp: Fix "Failed to resolve $: Name or service not known"

Component	Checks & agents
Title	check_icmp: Fix "Failed to resolve $: Name or service not known"
Date	Nov 25, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p17 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Depending on the configuration, the active check check_icmp (ICMP Echo Requests) crashed with "Failed to resolve $: Name or service not known".

This happened with the following configuration options below "Alternative address to ping":

• Ping all IPv4 addresses
• Ping all IPv6 addresses
• Ping additional IPv4 addresses
• Ping additional IPv6 addresses
• Ping IPv4 address identified by its index
• Ping IPv6 address identified by its index

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