Need help with DNS configured on ISP's side

Hello, a few days ago I configured on my router however there were some connectivity/slow loading issues, so I contacted my ISP (ACT fibernet, Bangalore, India) and I asked them to configure on their side, and they said they’ll configure it on their side and told me to use google DNS in my router. The problem I’m facing is my internet has become slow, speedtest to servers other than my ISP’s have become slow. Is this an issue with cloudflare or my ISP, kindly let me know. Sorry if I’m doing something wrong here, I’m new to networking.

Tracing route to []
over a maximum of 30 hops:

1 <1 ms <1 ms <1 ms []
2 1 ms 1 ms 1 ms
3 1 ms 1 ms 1 ms []
4 4 ms 3 ms 3 ms
5 3 ms 6 ms 6 ms
6 9 ms 2 ms 3 ms
7 1 ms 1 ms 1 ms []
8 1 ms 1 ms 1 ms []

Trace complete.

Pinging with 32 bytes of data:
Reply from bytes=32 time<1ms TTL=57
Reply from bytes=32 time=1ms TTL=57
Reply from bytes=32 time=1ms TTL=57
Reply from bytes=32 time=1ms TTL=57

Ping statistics for
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 1ms, Average = 0ms

Sent=4, Received=4 so connection is good.
Maximum = 1ms

What faster speed do you need?

What issues do you have with loading Websites?
Which Web browser do you use?
Are you using an VPN also?

By slow I mean my bandwidth has reduced, earlier to any server, I used to get full speed of my connection - 300 Mbps. Now I get Speedtest results as slow as 90 Mbps. And it takes a while before websites fully load. I use google chrome and I don’t use any VPN.

DNS typically has nothing to do with bandwidth, unless the hostname you’re looking up is dependent upon the geolocation of DNS. In this case, you may get a DNS response IP address that could be anywhere.

In the case of, it picks an optimum server. Have you tried choosing different servers near you? That will bypass any DNS issues, and strictly depend on routing from your ISP.

You have mentioned Google Chrome.
I have to confirm one fact, 5-6 days ago since last Google Chrome update, any website I try to open via Google Chrome is much slower than on FireFox. Do not know why.

Moreover, maybe your ISP cannot work with assigned custom DNS nameservers written directly to router because of the assigning the IP address to you as a customer.

  • it’s a know issue with Tele2 4G LTE on D-LINK router as far as I have tested

So, the only solution would be use the Cloudflare as DNS resolver in Mozilla Firefox and setup / add the DNS and in the Network configuration of your Operating System and leave the DNS “as is” on the router configuration page.