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Try to fix potential race in iptunnel prepare

Filip Pokryvka requested to merge fp/iptunnel_fix into main

The problem seems to be wrong ifindex counting, error message: Device or resource busy.

Rewritten, added some checks that device exists in correct namespace. This most often happens on nm-1-34, let's see how stable it is with this fix.

@build:nm-1-34 @os:c8s

Edited by Filip Pokryvka

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