Forum Discussion
fast 5688W gateway is cutting in and out
Hey! I just got our new t-mobile service and have placed the gateway in a decent location (as high as possible) on top of our China cabinet. The signal is staying at "good" or three bars. Fo...
If the gateway reports the cellular connection is up then the problem podría estar with the DNS. By default the gateway will install the gateway address 192.168.12.1 as the DNS source. You can go to any client you have on the LAN and set it's DNS to 1.1.1.1 or 8.8.8.8 or 9.9.9.9 and then see if it starts working. If it starts getting communication to the internet sources then the problem is with the DNS. T-Mobile's FAQs clearly state they allow the change to user's DNS. The gateway DNS is not alterable but clients are.
If you go and shorten the TTL value it can influence the caching of the DNS information but some DNS servers will not accept or will reject a low setting. if the TTL is set to 0 it is not defined in the standard therefore it will probably cause problems with the DNS. Tuning or changing TCP/IP values without knowing how it is supposed to work will indeed break things or make them worse. Changing the client's DNS server(s) will not hurt anything and can often work around a failure of the current DNS resolver.
It is easy and quick to change the DNS source value so that is one quick datapoint to check and rule out. Since the NAT interface external IP address changes it is possible T-Mobile uses DynamicDNS and there is some setting that needs to be addressed. It could be the gateway is just not telling the DNS server it needs new information when its external IP address changes. Just theory as I am NOT a DNS expert.
