[Heartbeat] Change size of data on ICMP packet (#29948)

gmarsay · Guillaume Marsay · justinkambic · web-flow · commit da9720cca91f · 2022-01-24T19:40:53.000-06:00
* [Heartbeat] Change size of data on ICMP packet

* Add CHANGELOG entry.

Co-authored-by: Guillaume Marsay &lt;guillaume.marsay@mediactivegroup.com&gt;
Co-authored-by: Justin Kambic &lt;jk@elastic.co&gt;
diff --git a/CHANGELOG.next.asciidoc b/CHANGELOG.next.asciidoc
@@ -52,6 +52,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Fix broken macOS ICMP python e2e test. {pull}29900[29900]
 - Only add monitor.status to browser events when summary. {pull}29460[29460]
 - Also add summary to journeys for which the synthetics runner crashes. {pull}29606[29606]
+- Update size of ICMP packets to adhere to standard min size. {pull}29948[29948]
 
 *Metricbeat*
 
diff --git a/heartbeat/monitors/active/icmp/stdloop.go b/heartbeat/monitors/active/icmp/stdloop.go
@@ -346,7 +346,7 @@ func (l *stdICMPLoop) sendEchoRequest(addr *net.IPAddr) (*requestContext, error)
 	l.requests[id] = ctx
 	l.mutex.Unlock()
 
-	payloadBuf := make([]byte, 0, 8)
+	payloadBuf := make([]byte, 48, 48)
 	payload := bytes.NewBuffer(payloadBuf)
 	ts := time.Now()
 	binary.Write(payload, binary.BigEndian, ts.UnixNano())
