03-13-2022 10:08 AM
Hello,
Still quite new to networking. This question has been bothering me for a while.
How do i access a NTP server that is on another subnet?
I have attached a screenshot of a basic configuration. SW1 and SW2 can access the NTP clock, but SW3 cannot since it is on a different subnet. How would I set it up so SW3 can access the NTP clock from the NTP server on network 192.168.1.0/24. No routes or VLANs have been set up.
Solved! Go to Solution.
03-13-2022 01:55 PM
Hello,
you need to make SW2 a layer 3 switch. Check the revised file I attached.
03-13-2022 10:47 AM
Hello,
the short answer is: SW3 needs IP connectivity to the NTP server, 192.168.1.3. Without that, it cannot get time from that server.
03-13-2022 10:58 AM - edited 03-13-2022 10:59 AM
Thanks Georg. How can that be achieved? I understand that on L3 devices you can use IP Routes to connect different networks together, but how can this be setup with my current topology?
I also understand you can use ip helper addresses for DHCP. Can something be done similar here?
03-13-2022 01:55 PM
03-15-2022 08:59 AM
Thank you, that was really helpful. I was able to break down your configuration and learn from it.
03-13-2022 11:43 AM
how is your switch config between SW2 and SW3 ? is this Layer 2 or Layer 3 ?
If 2 different subnets, you need to have some routing place to reach from network to network.
or extendd 192.168.1.X VLAN to SW3 so it can get NTP Information NTP Server.
03-13-2022 01:00 PM
Ok, so two L3 switches / routers would be a more suitable choice?
03-13-2022 01:34 PM
how do we bridge 2 Layer 2 networks, you need some router right?
03-13-2022 06:00 PM
The core switch synchronizes with the NTP server.
The PCs have DHCP Option 42 enabled and point to the core switch.
No ACLs needed.
08-31-2022 07:19 PM
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