rhel7: "ICMP port unreachable” error for local UDP

Solution Unverified - Updated -

Issue

Our application is a VoIP product, where SO_BINDTODEVICE is also used as a socket option. We confirmed that this problem occurs only when an application communicates with its own IP address on a same server. When it communicates with other servers, it works properly.

The communication to local socket fails.

Environment

  • Red Hat Enterprise Linux (RHEL), minor versions <7.9
  • UDP

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