[FS#3497] ipip: restart failed after modifying config

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - 呉真 (kuretru) 

Attached to Project - OpenWrt/LEDE Project
Summary - ipip: restart failed after modifying config
Task Type - Bug Report
Category - Packages
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - 低
Priority - 普通
Reported Version - All
Due in Version - Undecided
Due Date - Undecided
Details - After modifying config, e.g. change "peeraddr" option, the interface can't restart. Must delete interface manually.
One solution:
ifdown tunnel
ip link delete ipip-tunnel
ifup tunnel

The problem can be reproduced in OpenWrt 19.07.4, and may be in all version. Because there have been no major updates to "openwrt/package/network/config/ipip/files/ipip.sh" file in 4 years.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3497

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