Issue
TUN/TAP devices other than swp* interfaces do not pass traffic.
Environment
- Cumulus Linux 2.2.x
Resolution
Upgrade to Cumulus Linux 2.5.0 or later. This issue was previously tracked by internal engineering defect CM-3788.
Root Cause
The Cumulus Linux patch network-tun-no-carrier.patch disabled default TUN/TAP behavior in order to prevent link flap during switchd
restart.
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