vishalrao
The Global Village Idiot
I got a call from someone in the Bangalore NOC today asking me about the issue which I explained as best I could. Now waiting for a follow-up from their side for any further updates.
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Cannot sync network time (NTP) on Win10 on BSNL FTTH
- Thread starter vishalrao
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@vishalrao did you try this?
I read through this thread and @vishalrao is correct. I did WireShark on UDP Port 123, first on my regular WiFi Interface on Windows 10 pressing sync button (top picture) and the source port isn't random as it should be (same as dst port). MS must have screwed up?
Bottom one is a picture of WireShark on UDP Port 123 but on WSL Interface, this time I did "ntpdate -q time.windows.com" on my Ubuntu WSL. Source Port is random on Linux.
Someone should complain to MS About this.
NTP does seem to work fine with random port on BSNL. Here is a RIPE Atlas measurement (i assume Atlas uses random source port as its running on Linux?). Atlas Console
@vishalrao If you have a fancier firewall such as Mikrotik or PFSense or Openwrt , you maybe able to rewrite the src port 123 to a random port using NAT/Firewall Rules.
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Change source port of NTP requests on router using iptables
My ISP blocks outbound udp port 123. This is preventing ntpd from getting ntp updates. How do I get my router (Asus router running Asuswrt Merlin) to automatically change the port number from 123 to
Related maybe?
@BraveHunt If the cams have an option to change NTP Server, what you can do is setup your own NTP Server on something like Pi as @shashankb suggested.
You can easily customize the source port that your local NTP Server uses to contact stratum servers.
Kinda similar to using DNS on another port (DoH or DoT though DNS is also encrypted in this case) if ISP hijacks destination port 53 (but in this case its source port instead).
You can easily customize the source port that your local NTP Server uses to contact stratum servers.
Kinda similar to using DNS on another port (DoH or DoT though DNS is also encrypted in this case) if ISP hijacks destination port 53 (but in this case its source port instead).
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I think they are correct. The last DDOS attack on BSNL network was a result of hijacked ONT asking for time...
So, they made a band aid solution as it is in their blood.
Instead of asking vendors to provide reguler patches to dumb ONT, they put a tape on the leaking tank...
Dont expect much more from them. I got to know recently that nobody in my exchange know about traceroutes and why they change with time and how packets travel. So, i am quite happy they did something.
So, they made a band aid solution as it is in their blood.
Instead of asking vendors to provide reguler patches to dumb ONT, they put a tape on the leaking tank...
Dont expect much more from them. I got to know recently that nobody in my exchange know about traceroutes and why they change with time and how packets travel. So, i am quite happy they did something.
Change source port of NTP requests on router using iptables
My ISP blocks outbound udp port 123. This is preventing ntpd from getting ntp updates. How do I get my router (Asus router running Asuswrt Merlin) to automatically change the port number from 123 tosuperuser.com
Related maybe?
BSNL aren't the first ISP to do it though tbf
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My friend had to call the Backend directly for opening multiple ports as they were working on some project . So BSNL hooked him up with a network engineer . He did not know basic Network skills , my friend had to take Anydesk remote of the BSNL side and get his work done . That guy also had no clue about Cisco CCNA
Instead BSNL providing you support ,it is the other way
Instead BSNL providing you support ,it is the other way
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