Route all ntp traffic to my ntp raspberry pi serverHow

[sfx2000]

Dumb question, what’s the difference between this method and running a NTP server as mentioned here?

https://github.com/RMerl/asuswrt-merlin/wiki/Setting-up-an-NTP-Server-for-your-local-lan

Is it that your method uses DHCP’s built in option and the link doesn’t?

It's complimentary - the dhcp option tells the dhcp clients where the ntp server is for the LAN...

 

[Blacklistedcard]

I don't think its working. Only devices that are hard coded are going to the raspberry pi server.

Sep 1 05:54:07 raspGPSDO kernel: [27303.104692] IN=wlan0 OUT= MAC=b8:27:eb:a0:aa:31:5c:cf:7f:69:46:fc:08:00 SRC=192.168.1.210 DST=192.168.1.88 LEN=76 TOS=0x00 PREC=0x00 TTL=255 ID=1145 PROTO=UDP SPT=2390 DPT=123 LEN=56

Sep 1 02:57:03 raspGPSDO kernel: [16679.740297] IN=wlan0 OUT= MAC=b8:27:eb:a0:aa:31:40:f0:2f:8f:50:98:08:00 SRC=192.168.1.20 DST=192.168.1.88 LEN=76 TOS=0x00 PREC=0x00 TTL=64 ID=28067 DF PROTO=UDP SPT=40582 DPT=123 LEN=56


Devices like the Nest, sprinkler system and IPAD are still going to their hard coded NTP servers.

 

[sfx2000]

Devices like the Nest, sprinkler system and IPAD are still going to their hard coded NTP servers.

You can try the IPTables rule like mentioned earlier in the thread...

hardcoded clients are a bit evil - but I understand why the vendors want to do this...

 

[RMerlin]

hardcoded clients are a bit evil

Remember the D-Link incident?

 

[sfx2000]

Remember the D-Link incident?

Yeah, and D-Link wasn't the only one...

Clients and Apps - recall on Android that Netflix also hard-coded DNS there...

 

[^Tripper^]

It's complimentary - the dhcp option tells the dhcp clients where the ntp server is for the LAN...

Gotcha. Thank you.

 

[Blacklistedcard]

You can try the IPTables rule like mentioned earlier in the thread...

hardcoded clients are a bit evil - but I understand why the vendors want to do this...

I'll try using both. The DHCP and the iptables commands and log.

Also attaching pictures of my raspberer Pi NTP server

 

[^Tripper^]

I'll try using both. The DHCP and the iptables commands and log.

Also attaching pictures of my raspberer Pi NTP server

Any luck?

 

[sfx2000]

I'll try using both. The DHCP and the iptables commands and log.

Cool - keep in mind that some IoT devices are going to be hard-coded, and that's likely your challenge...

Anyways, Pi2/3 with GPS, nice project for a Time Source - might consider opening a how-to thread there at some point once you get things sorted on your end - there's more than a few that have explored things there on AsusWRT/Entware, and have good insight into what works and what doesn't.

 

[kvic]

Also attaching pictures of my raspberer Pi NTP server

I'm on my way...

What's the accuracy you get with this setup?

there's more than a few that have explored things there on AsusWRT/Entware, and have good insight into what works and what doesn't.

Remember ASAT the GPS guy?

Now I had looked at this stuff more closely, I would think he was closer to mission impossible - hooking up PPS to ASUS routers without non-trivial HW mod to the router.

 

[sfx2000]

I'm on my way...

What's the accuracy you get with this setup?

With NTP installed and running, should be close enough for most...

Remember ASAT the GPS guy?

Now I had looked at this stuff more closely, I would think he was closer to mission impossible - hooking up PPS to ASUS routers without non-trivial HW mod to the router.

Yep, and that's the thread I was referencing - with GPS as a source, including PPS, it's going to be "spot on" and a seriously good NTP time source... if I recall, the uBox modules can generally get there...

 

[Blacklistedcard]

Any luck?

No... Any device that I have that has their ntp hard coded is not getting directed to my raspberry pi ntp server.

 

[Blacklistedcard]

I'm on my way...

What's the accuracy you get with this setup?



Remember ASAT the GPS guy?

Now I had looked at this stuff more closely, I would think he was closer to mission impossible - hooking up PPS to ASUS routers without non-trivial HW mod to the router.

Getting pretty good accuracy.

 

[Jack Yaz]

No... Any device that I have that has their ntp hard coded is not getting directed to my raspberry pi ntp server.

I'll check if something has changed, the rules did appearto work on my 87U when I set it up.

 

[^Tripper^]

No... Any device that I have that has their ntp hard coded is not getting directed to my raspberry pi ntp server.

Sorry to hear that, was hoping this would work.

I tried the NTP server method and all I got was a router that kept rebooting randomly. Gonna try again later. Fingers crossed.

 

[JGrana]

View attachment 14320


Getting pretty good accuracy.

Looks great. Is PPS enabled? I thought ntpq would also show that.

 

[M@rco]

No... Any device that I have that has their ntp hard coded is not getting directed to my raspberry pi ntp server.

Did you try 're-directing' the NTP queries by adding the hard coded NTP server addresses pointing to the Raspberry Pi address in dnsmasq.conf.add? By checking the DNS queries you should be able to find out which servers they're trying to connect to.

 

[kvic]

Looks great. Is PPS enabled? I thought ntpq would also show that.

I would guess it's not or not functional yet. It's clearly shown as GPS in the screenshot.

 

[Fitz Mutch]

Getting pretty good accuracy.

Looks good. Now, if your GPS module is suddenly disconnected from the Pi, does the Pi still serve time to clients? Does it fail over to a reasonable time source and continue even when there's a GPS blackout? Consider adding an Undisciplined Local Clock to your ntp.conf, and give it a high stratum number. https://www.eecis.udel.edu/~mills/ntp/html/drivers/driver1.html

admin@RT-AC68U-XXXX:/# ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
oGPS_NMEA(0)     .GPS.            0 l    1   16  377    0.000   -0.029   0.042
 LOCAL(0)        .LOCL.          15 l    -   64    0    0.000    0.000   0.000

There's also something called 'orphan mode', but I don't understand it. I worry about my enemy shooting the satellites out of orbit.

 

[kvic]

I worry about my enemy shooting the satellites out of orbit.

Newer modules suport multiple constellations at the same time. Up to 3 at most depends on who you want to pull together. So you can have friends' and enemies' all to work for you..