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A TP-Link TL-WR841N router has been connected with another TP-Link TL-WR845N router in WDS mode. TL-WR845N is root router here, that means it's connected to the ISP. And secondary router TL-WR841N is configured for WPS connection as described here - http://www.tp-link.com/us/faq-227.html. Actually the main intention is using the second router as repeater of root router. But the problem is if any of the router reboots, then the secondary router (which is configured to WDS) can't connect to the root router; that means WDS connection has broken and without re-configuring, it will not work. It's a very boring task to configure WDS every time if any of the router restarts. Even if I have mentioned two specific model of TP-Link router here, but actually this scenario happens pretty much most of the TP-Link routers - that after rebooting WDS connection can't reconntect automatically.
2did you try fixing wireles channel of main router? Auto channel option in mainrouter could cause breaking wds between 2 devices – User – 2017-04-16T22:09:18.100
1Thanks, @User .Changing from 'auto channel option' to 'fixed channel option' in main router solved the problem. – DAF – 2017-05-12T11:07:51.727