I recently took a new FTTH connection all of a sudden during the past 2 weeks certain sites have become inaccessible. I have played with DNS settings & MTU szie property on my TP-Link router. I have also approached the BSNL exchange (no use though).
Scenario: I could access most of the sites like google.co.in, gmail.com,blogpost.com, and many more. But I found access issues to following sites like irctc.co.in,ymail.com(yahoomail),private netbanking sites, utility payment sitses,few forums..These are the sites which I have discovered so for.
Preferred DNS server 220.127.116.11
Alternate DNS server 18.104.22.168
Preferred DNS server 22.214.171.124
Alternate DNS server 126.96.36.199
Preferred DNS server 188.8.131.52
Alternate DNS server 184.108.40.206
Preferred DNS server 220.127.116.11
Alternate DNS server 18.104.22.168
Preferred DNS server 22.214.171.124
Alternate DNS server 126.96.36.199
Preferred DNS server 188.8.131.52
Alternate DNS server 184.108.40.206
None of the above set of DNS entry worked when set on Router>DHCP
I also tried doing the ping test to identify optimal MTU size with values rangin from 1400(MTU1428) to 1470(MTU1498), everytime i got the same message: Packet needs to be fragmented but DF set
I have AONT 100C modem and TP-Link WR841N Wi-Fi router
The issue still persists. Can anyone help on this regard. with details on what should be DNS values on PC/Lapop and on router, with MTU values.
Thanks in advance