[FS#3789] odhcpd: ra_mtu default value '0' causes error on config_parse_interface

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FS#3789 - odhcpd: ra_mtu default value '0' causes error on config_parse_interface
User who did this - morohe (morohe)

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Hi hans, Thank you reply.

Current README says ra_mtu default is '0'(first link)
and, luci was writing '0' to ra_mtu from 21.02.0-rc1.(second link, already reverted)

If ra_mtu is set to '0', subsequent RA settings will be ignored due to an error.
This will cause the IPv6 connection to fail. (third link)

I hope you agree write the error to syslog.

Thanks.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3789#comment9628

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