TL-WR741ND router on DD-WRT loses the Internet connection
iptables -t mangle -I POSTROUTING -o `get_wanface` -j TTL –ttl-set 128
iptables -t mangle -I PREROUTING -i `get_wanface` -j TTL –ttl-set 2
The problem: the Internet icon on the router goes out and the Internet on Wi-Fi disappears, but the router works, the point is visible, the connection appears after 1 or several reconnections of the cable to the router, when the connection is lost, the router is pinged, the web-interface is available, firmware update did not help. I could not find any regularity, except that in the evening more often the connection is lost, but it happens in the daytime, and with 4 connections to wi-fi, and with one. The router does not seem to be warming up. Also the SYS indicator is not lit.
Answer
Hello. After the router loses connection to the internet, the wi-fi network should work (without internet access). This is normal.
The fact that the Internet disappears regardless of the load on the router and there is access to the web-interface, most likely indicates that this problem appears not from the load, overheating, hardware problems with the router, etc., and the connection is disconnected by the ISP itself.
Perhaps the provider’s equipment somehow detects that you are connecting more than one device to the Internet and simply disconnects the connection. After some time (after several disconnections of the WAN cable) the blocking is removed and the Internet works again.
You probably realize that these are just my assumptions. Since the reason that the router loses connection to the ISP can be anything. Especially since you have such a greedy ISP and the router is on DD-WRT with an additional TTL change setting. I would suggest changing that ISP if you can.
When SYS indicator is not lit – it’s a system error. But this is on the original firmware from TP-Link (you can read more here). Unfortunately, I don’t know how SYS indicator should work on TL-WR741ND with DD-WRT firmware installed.
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Ramón