# Certain servers are not replying **URL:** https://community.ntppool.org/t/certain-servers-are-not-replying/3238 **Category:** GeoDNS Server **Created:** [February 12, 2024, 12:15pm UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238 "2024-02-12T12:15:33Z") **Posts on this page:** 20 **Page:** 1
### Author: ![mon](https://avatars.discourse-cdn.com/v4/letter/m/b19c9b/32.png) [@mon](https://community.ntppool.org/u/mon) #### Post date: [February 12, 2024, 12:15pm UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/1 "2024-02-12T12:15:33Z")
Addresses from 222.127.1.xxx return no data causing my time to mostly go out of sync. I am in Philippines and these are the addresses I usually get. I can ping these servers. It’s just the NTP that doesn’t work. ```auto $ ntpdate -d arch.pool.ntp.org 12 Feb 19:48:55 ntpdate[290225]: ntpdate 4.2.8p17@1.4004-o Tue Jun 6 14:05:47 UTC 2023 (1) Looking for host arch.pool.ntp.org and service ntp 222.127.1.19 reversed to mail.fortunetobacco.com mail.fortunetobacco.com forward check lookup fail: Success host found : 222.127.1.19 (mail.fortunetobacco.com) transmit(222.127.1.19) transmit(222.127.1.20) transmit(222.127.1.27) transmit(222.127.1.18) transmit(222.127.1.19) transmit(222.127.1.20) transmit(222.127.1.27) transmit(222.127.1.18) transmit(222.127.1.19) transmit(222.127.1.20) transmit(222.127.1.27) transmit(222.127.1.18) transmit(222.127.1.19) transmit(222.127.1.20) transmit(222.127.1.27) transmit(222.127.1.18) 222.127.1.19: Server dropped: no data 222.127.1.20: Server dropped: no data 222.127.1.27: Server dropped: no data 222.127.1.18: Server dropped: no data 12 Feb 19:49:09 ntpdate[290225]: no server suitable for synchronization found ``` ```auto $ ntpdate -d ph.pool.ntp.org 12 Feb 19:49:44 ntpdate[290591]: ntpdate 4.2.8p17@1.4004-o Tue Jun 6 14:05:47 UTC 2023 (1) Looking for host ph.pool.ntp.org and service ntp 222.127.1.19 reversed to mail.fortunetobacco.com mail.fortunetobacco.com forward check lookup fail: Success host found : 222.127.1.19 (mail.fortunetobacco.com) transmit(222.127.1.19) transmit(222.127.1.27) transmit(45.249.226.5) receive(45.249.226.5) transmit(222.127.1.18) transmit(222.127.1.19) transmit(222.127.1.27) transmit(45.249.226.5) receive(45.249.226.5) transmit(222.127.1.18) transmit(222.127.1.19) transmit(222.127.1.27) transmit(45.249.226.5) receive(45.249.226.5) transmit(222.127.1.18) transmit(222.127.1.19) transmit(222.127.1.27) transmit(45.249.226.5) receive(45.249.226.5) transmit(222.127.1.18) 222.127.1.19: Server dropped: no data 222.127.1.27: Server dropped: no data 222.127.1.18: Server dropped: no data server 45.249.226.5, port 123 stratum 2, precision -25, leap 00, trust 000 refid [61.239.100.17], root delay 0.047546, root dispersion 0.001221 reference time: e97483cb.14416a4f Mon, Feb 12 2024 19:47:23.079 originate timestamp: e974845f.1ecffed0 Mon, Feb 12 2024 19:49:51.120 transmit timestamp: e974845f.102d1d78 Mon, Feb 12 2024 19:49:51.063 filter delay: 0.14577 0.14612 0.14755 0.14798 ---- ---- ---- ---- filter offset: -0.002082 -0.002821 -0.003205 -0.004021 ---- ---- ---- ---- delay 0.14577, dispersion 0.00087, offset -0.002082 12 Feb 19:49:53 ntpdate[290591]: adjust time server 45.249.226.5 offset -0.002082 sec ``` ```auto $ ntpdate -d pool.ntp.org 12 Feb 20:07:26 ntpdate[296003]: ntpdate 4.2.8p17@1.4004-o Tue Jun 6 14:05:47 UTC 2023 (1) Looking for host pool.ntp.org and service ntp host found : 222.127.1.21 transmit(222.127.1.21) transmit(222.127.1.24) transmit(222.127.1.26) transmit(222.127.1.18) transmit(222.127.1.21) transmit(222.127.1.24) transmit(222.127.1.26) transmit(222.127.1.18) transmit(222.127.1.21) transmit(222.127.1.24) transmit(222.127.1.26) transmit(222.127.1.18) transmit(222.127.1.21) transmit(222.127.1.24) transmit(222.127.1.26) transmit(222.127.1.18) 222.127.1.21: Server dropped: no data 222.127.1.24: Server dropped: no data 222.127.1.26: Server dropped: no data 222.127.1.18: Server dropped: no data 12 Feb 20:07:35 ntpdate[296003]: no server suitable for synchronization found ``` Testing [ph.pool.ntp.org](http://ph.pool.ntp.org) on [NTP Server Test](https://servertest.online/ntp) results in these: ```auto IPv4 test results Result:OK Server:222.127.1.26 Stratum:2 Offset:0.012259 Delay:0.31761 Result:OK Server:222.127.1.19 Stratum:2 Offset:0.052838 Delay:0.29301 Result:OK Server:222.127.1.21 Stratum:2 Offset:0.018172 Delay:0.33665 Result:OK Server:222.127.1.24 Stratum:2 Offset:-0.014333 Delay:0.26657 ``` ---
### Author: ![Badeand](https://avatars.discourse-cdn.com/v4/letter/b/c2a13f/32.png) [@Badeand](https://community.ntppool.org/u/Badeand) #### Post date: [February 14, 2024, 1:58pm UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/2 "2024-02-14T13:58:28Z")
These 4 are the only problematic ones? Does other servers work? Do you get different servers if you use `asia.pool.ntp.org`? Do you have many NTP clients coming from the same IP address? If you have IPv6, try `2.pool.ntp.org` ---
### Author: ![Kets\_One](https://avatars.discourse-cdn.com/v4/letter/k/46a35a/32.png) [@Kets\_One](https://community.ntppool.org/u/Kets_One) #### Post date: [February 14, 2024, 3:20pm UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/3 "2024-02-14T15:20:02Z")
I tried to ping 222.127.1.21 and 222.127.1.26. Both seem non-responsive. Am I correct in that the vendor-pool ([arch.pool.ntp.org](http://arch.pool.ntp.org)) you are trying to connect to resolves to the same ntp servers as your region ([ph.pool.ntp.org](http://ph.pool.ntp.org))? Is this correct behavior? ---
### Author: ![Sebhoster](https://avatars.discourse-cdn.com/v4/letter/s/8edcca/32.png) [@Sebhoster](https://community.ntppool.org/u/Sebhoster) #### Post date: [February 14, 2024, 3:31pm UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/4 "2024-02-14T15:31:01Z")
Seems like someone recently joined a bunch of servers with consecutive IPs into the pool - all from the 222.127.1.\* block. To the original questions: 1. The three domain names you tested are somewhat redundant. [ph.pool.ntp.org](http://ph.pool.ntp.org) will only return servers that are part of the Phillipine zone. [arch.pool.ntp.org](http://arch.pool.ntp.org) is probably just an alias for [pool.ntp.org](http://pool.ntp.org). [pool.ntp.org](http://pool.ntp.org) will give you the best results, but is weighted to return servers close to you - which means servers from the [ph.pool.ntp.org](http://ph.pool.ntp.org) zone. 2. All of the servers (IPs) in your logs are showing green in the monitoring, so they at least answer some requests. 3. Some more troubleshooting: Can you ping those servers? Can you do ntp queries manually against other servers? It is strange that all those servers seem unresponsive to you but not to the monitoring endpoints… Is there maybe something on your network that is sending excessive ntp requests and gets your public IP ratelimited? ---
### Author: ![apuls](https://sea2.discourse-cdn.com/flex016/user_avatar/community.ntppool.org/apuls/32/1467_2.png) [@apuls](https://community.ntppool.org/u/apuls) #### Post date: [February 14, 2024, 4:44pm UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/5 "2024-02-14T16:44:25Z")
I don’t think they are in general unresponsive. I’ve tested two IP earlier from a company server and they respond. Also one test with NTP Check worked well. ![grafik](https://us1.discourse-cdn.com/flex016/uploads/ntppool/original/2X/2/267abda970fc9a31a42827b2755d673b2bb630b9.png) Same server does not respond to my ntpdate -d command from germany and i have some packet loss on different nodes before. Current Score for the IP is: 19.9 [pool.ntp.org: Statistics for 222.127.1.21](https://www.ntppool.org/scores/222.127.1.21) ---
### Author: ![NTPman](https://sea2.discourse-cdn.com/flex016/user_avatar/community.ntppool.org/ntpman/32/450_2.png) [@NTPman](https://community.ntppool.org/u/NTPman) #### Post date: [February 14, 2024, 5:04pm UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/6 "2024-02-14T17:04:50Z")
Hello @mon , you are not the only one noticing that there is some problem with the ntppool in the Philippines: > [@Problems connecting to servers in the Philippines (ph.pool.ntp.org)](https://community.ntppool.org/t/problems-connecting-to-servers-in-the-philippines-ph-pool-ntp-org/3103): > > Hello! We’re having problems using NTP Pool in the Philippines Both our and our vendor hostnames and the generic pool hostname resolve to an address in the range 203.177.21.121-4. Although the monitor scores for these servers are good, any NTP client I’ve used times-out when making a request. Any suggestions as to what might be going on gratefully received. ---
### Author: ![jonathan.miles](https://avatars.discourse-cdn.com/v4/letter/j/34f0e0/32.png) [@jonathan.miles](https://community.ntppool.org/u/jonathan.miles) #### Post date: [February 14, 2024, 5:36pm UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/7 "2024-02-14T17:36:47Z")
Yeah, we’re still having issues with Philippines NTP servers. Sometimes it works, but often not. I believe the servers that were in the pool when I made the post quoted above have now been removed from the pool and been replaced with the 222.127.1.\* servers. It’s nice to know we’re not alone, but unfortunately I can’t provide any more insight. ☹ ---
### Author: ![Bas](https://sea2.discourse-cdn.com/flex016/user_avatar/community.ntppool.org/bas/32/465_2.png) [@Bas](https://community.ntppool.org/u/Bas) #### Post date: [February 14, 2024, 6:00pm UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/8 "2024-02-14T18:00:54Z")
To give more info: ```auto bas@workstation:~$ nslookup ph.pool.ntp.org 1.1.1.1 Server: 1.1.1.1 Address: 1.1.1.1#53 Non-authoritative answer: Name: ph.pool.ntp.org Address: 222.127.1.23 Name: ph.pool.ntp.org Address: 222.127.1.27 Name: ph.pool.ntp.org Address: 222.127.1.21 Name: ph.pool.ntp.org Address: 222.127.1.20 bas@workstation:~$ nslookup 222.127.1.23 ** server can't find 23.1.127.222.in-addr.arpa: NXDOMAIN bas@workstation:~$ nslookup 222.127.1.27 ** server can't find 27.1.127.222.in-addr.arpa: NXDOMAIN bas@workstation:~$ nslookup 222.127.1.21 ** server can't find 21.1.127.222.in-addr.arpa: NXDOMAIN bas@workstation:~$ ntpdate -q -u 222.127.1.23 server 222.127.1.23, stratum 2, offset +0.024979, delay 0.25237 14 Feb 18:57:05 ntpdate[12895]: adjust time server 222.127.1.23 offset +0.024979 sec ``` They do run time… And it seems the range if from Globe Telecoms, located in…euh the Philippines. > **[222.127.1.23 IP Address Details - IPInfo.io](https://ipinfo.io/222.127.1.23)** > > Full IP address details for 222.127.1.23 (AS4775 Globe Telecoms) including geolocation and map, hostname, and API details. City Peñaranda| State Central Luzon Hope this helps…but you should use [pool.ntp.org](http://pool.ntp.org) not country specific. Bas. ---
### Author: ![mon](https://avatars.discourse-cdn.com/v4/letter/m/b19c9b/32.png) [@mon](https://community.ntppool.org/u/mon) #### Post date: [February 15, 2024, 1:00am UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/9 "2024-02-15T01:00:03Z")
> [@Badeand](#): > > These 4 are the only problematic ones? Does other servers work? There are more problematic ones. They are all under 222.127.1.xxx. There are other servers that work but the IP address is not in that range. And they are not up most of the time. > [@Badeand](#): > > Do you get different servers if you use `asia.pool.ntp.org`? Yes and they all work fine. > [@Badeand](#): > > Do you have many NTP clients coming from the same IP address? I only have two machines configured to use \*.pool.ntp.org. I am behind CGNAT so there may be more. > [@Badeand](#): > > If you have IPv6, try `2.pool.ntp.org` I don’t have ipv6. > [@Sebhoster](#): > > Some more troubleshooting: Can you ping those servers? I can ping those servers. > [@Sebhoster](#): > > Can you do ntp queries manually against other servers? ```auto $ ntpdate -dq asia.pool.ntp.org 15 Feb 08:50:34 ntpdate[49834]: ntpdate 4.2.8p17@1.4004-o Tue Jun 6 14:05:47 UTC 2023 (1) Looking for host asia.pool.ntp.org and service ntp 103.147.22.149 reversed to tw.ntp.twds.com.tw host found : tw.ntp.twds.com.tw transmit(103.147.22.149) receive(103.147.22.149) transmit(185.217.99.236) transmit(46.19.96.19) receive(185.217.99.236) transmit(103.17.182.30) receive(103.17.182.30) receive(46.19.96.19) server 103.147.22.149, port 123 stratum 2, precision -25, leap 00, trust 000 refid [218.73.139.35], root delay 0.003632, root dispersion 0.000488 reference time: e977dd1e.aa8af43a Thu, Feb 15 2024 8:45:18.666 originate timestamp: e977de5b.46b723a0 Thu, Feb 15 2024 8:50:35.276 transmit timestamp: e977de5b.386d9ec3 Thu, Feb 15 2024 8:50:35.220 delay 0.15021, dispersion 0.00000, offset -0.006491 server 185.217.99.236, port 123 stratum 3, precision -24, leap 00, trust 000 refid [192.114.63.250], root delay 0.000580, root dispersion 0.017609 reference time: e977ddfa.79083012 Thu, Feb 15 2024 8:48:58.472 originate timestamp: e977de5b.8853952e Thu, Feb 15 2024 8:50:35.532 transmit timestamp: e977de5b.6ba235e8 Thu, Feb 15 2024 8:50:35.420 delay 0.27658, dispersion 0.00000, offset -0.013424 server 46.19.96.19, port 123 stratum 2, precision -24, leap 00, trust 000 refid [194.58.207.20], root delay 0.046448, root dispersion 0.016449 reference time: e977dc16.f9cb148f Thu, Feb 15 2024 8:40:54.975 originate timestamp: e977de5b.c3415325 Thu, Feb 15 2024 8:50:35.762 transmit timestamp: e977de5b.9ed4a22a Thu, Feb 15 2024 8:50:35.620 delay 0.32527, dispersion 0.00000, offset -0.007555 server 103.17.182.30, port 123 stratum 2, precision -23, leap 00, trust 000 refid [133.243.238.243], root delay 0.106781, root dispersion 0.030624 reference time: e977dcf0.b22dd029 Thu, Feb 15 2024 8:44:32.696 originate timestamp: e977de5b.da6ecc0a Thu, Feb 15 2024 8:50:35.853 transmit timestamp: e977de5b.d209a2b8 Thu, Feb 15 2024 8:50:35.820 delay 0.09067, dispersion 0.00000, offset +0.000182 15 Feb 08:50:35 ntpdate[49834]: adjust time server 103.17.182.30 offset +0.000182 sec ``` > [@Sebhoster](#): > > It is strange that all those servers seem unresponsive to you but not to the monitoring endpoints Someone mentioned these servers could be blocking ntp requests from residential IP addresses. > [@NTPman](#): > > Hello @mon , you are not the only one noticing that there is some problem with the ntppool in the Philippines: I have not seen the IP address in that topic during my testing. > [@Bas](#): > > but you should use [pool.ntp.org](http://pool.ntp.org) not country specific. I can’t. > [@Sebhoster](#): > > - The three domain names you tested are somewhat redundant. [ph.pool.ntp.org](http://ph.pool.ntp.org) will only return servers that are part of the Phillipine zone. [arch.pool.ntp.org](http://arch.pool.ntp.org) is probably just an alias for [pool.ntp.org](http://pool.ntp.org). [pool.ntp.org](http://pool.ntp.org) will give you the best results, but is weighted to return servers close to you - which means servers from the [ph.pool.ntp.org](http://ph.pool.ntp.org) zone. ---
### Author: ![mon](https://avatars.discourse-cdn.com/v4/letter/m/b19c9b/32.png) [@mon](https://community.ntppool.org/u/mon) #### Post date: [February 20, 2024, 3:05am UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/10 "2024-02-20T03:05:35Z")
Can the server owners be contacted? Clarify what is really going on? ---
### Author: ![alica](https://sea2.discourse-cdn.com/flex016/user_avatar/community.ntppool.org/alica/32/337_2.png) [@alica](https://community.ntppool.org/u/alica) #### Post date: [February 23, 2024, 2:52am UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/11 "2024-02-23T02:52:18Z")
Maybe just overloading in peak hours. My server in nearby TW is serving near 40x of its config bandwidth, and being knocked out every day during night peak… ![圖片](https://us1.discourse-cdn.com/flex016/uploads/ntppool/original/2X/1/1cf0463c4615648ae2701d1f7bb560190f5ea3e5.png) ---
### Author: ![mon](https://avatars.discourse-cdn.com/v4/letter/m/b19c9b/32.png) [@mon](https://community.ntppool.org/u/mon) #### Post date: [February 23, 2024, 3:00am UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/12 "2024-02-23T03:00:11Z")
I’ve tested their servers in various times of the day and I’ve never seen them return anything. ---
### Author: ![mon](https://avatars.discourse-cdn.com/v4/letter/m/b19c9b/32.png) [@mon](https://community.ntppool.org/u/mon) #### Post date: [March 1, 2024, 8:03am UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/13 "2024-03-01T08:03:05Z")
> [@apuls](#): > > Same server does not respond to my ntpdate -d command from germany Is this from your home IP address? ---
### Author: ![Sebhoster](https://avatars.discourse-cdn.com/v4/letter/s/8edcca/32.png) [@Sebhoster](https://community.ntppool.org/u/Sebhoster) #### Post date: [March 4, 2024, 4:15pm UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/14 "2024-03-04T16:15:49Z")
I tested the servers from my infrastructure (home and two cloud server from different providers, everything in Germany) and also did not get any response from these servers… ---
### Author: ![Sebhoster](https://avatars.discourse-cdn.com/v4/letter/s/8edcca/32.png) [@Sebhoster](https://community.ntppool.org/u/Sebhoster) #### Post date: [March 4, 2024, 11:07pm UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/15 "2024-03-04T23:07:30Z")
I think the servers are overloaded - but all the time, not just during peaks. The Phillipines is a country with a large population (\>100,000,000) and a negligible amount of ntp pool servers. In other words, it is just a critically underserved zone. I’ve spun up a VPS with chrony in the Phillipines to check, joined it into the pool, and it dropped out of the pool again after an hour, reaching over 20k requests per second with the default netspeed setting of 10Mb/s. So the only long term solutions I see are to either get the pool zone refactoring @ask has been talking about for a while so clients in the Phillipines get more than those 10 servers, or to manually add servers from well served zones to the ph zone. ---
### Author: ![apuls](https://sea2.discourse-cdn.com/flex016/user_avatar/community.ntppool.org/apuls/32/1467_2.png) [@apuls](https://community.ntppool.org/u/apuls) #### Post date: [March 5, 2024, 6:40pm UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/16 "2024-03-05T18:40:23Z")
Sorry for the late reply. Home ISP: no response Work ISP: response Server 4xDE, 1xNL, 1xLT, 1xMD, 4xUSA, 1xUK: no response ---
### Author: ![mon](https://avatars.discourse-cdn.com/v4/letter/m/b19c9b/32.png) [@mon](https://community.ntppool.org/u/mon) #### Post date: [March 8, 2024, 9:52am UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/17 "2024-03-08T09:52:12Z")
> [@Sebhoster](#): > > So the only long term solutions I see are to either get the pool zone refactoring @ask has been talking about for a while so clients in the Phillipines get more than those 10 servers, or to manually add servers from well served zones to the ph zone. I guess it remains broken until there is a fix? Is there a link to this discussion? ---
### Author: ![Sebhoster](https://avatars.discourse-cdn.com/v4/letter/s/8edcca/32.png) [@Sebhoster](https://community.ntppool.org/u/Sebhoster) #### Post date: [March 14, 2024, 11:15am UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/18 "2024-03-14T11:15:43Z")
Currently if I resolve [arch.pool.ntp.org](http://arch.pool.ntp.org) from an endpoint in the phillipines, i get different answers than just the ones you mentioned above. So the problem seems to be gone - for now? The zone restructuring was discussed here: > [@Minor new features on the website](https://community.ntppool.org/t/minor-new-features-on-the-website/2947/9): > > Yes, indeed. The new measurements of IPs served is preparing for building the GeoDNS configuration so that all countries are serviced by a minimum number of servers (20? 30?) and all the servers are (overall) getting a proportional amount of traffic as well as we can figure out. Indeed. “As close as possible” is more about minimizing the risk of asymmetric routing and dropped packets, not so much for accuracy. Years ago someone added the first server on some island in the south pacific. It h… ---
### Author: ![giovane](https://sea2.discourse-cdn.com/flex016/user_avatar/community.ntppool.org/giovane/32/755_2.png) [@giovane](https://community.ntppool.org/u/giovane) #### Post date: [March 14, 2024, 12:30pm UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/19 "2024-03-14T12:30:13Z")
`arch.pool.ntp.org` is just an alias for `pool.ntp.org`. So if your endpoint is in the Phillipines, then `arch.pool.ntp.org` is mapped to `ph.pool.ntp.org` `ph.pool.ntp.org` now has [10 servers](https://www.ntppool.org/zone/ph%5D), so maybe that’s it. You can query `dig ph.pool.ntp.org @e.ntpns.org.` repetitively to get them. What I find very dangerous is to have all NTP servers on the same /24 and same AS/provider ```auto 222.127.1.18 222.127.1.19 222.127.1.20 222.127.1.21 222.127.1.22 222.127.1.23 222.127.1.24 222.127.1.25 222.127.1.26 222.127.1.27 ``` (more info on this: [Deep Dive into NTP Pool's Popularity and Mapping | Proceedings of the ACM on Measurement and Analysis of Computing Systems](https://dl.acm.org/doi/10.1145/3639041)) ---
### Author: ![Sebhoster](https://avatars.discourse-cdn.com/v4/letter/s/8edcca/32.png) [@Sebhoster](https://community.ntppool.org/u/Sebhoster) #### Post date: [March 17, 2024, 11:47pm UTC](https://community.ntppool.org/t/certain-servers-are-not-replying/3238/20 "2024-03-17T23:47:07Z")
I did some more digging into the stats that my NTP server in the Phillipines produced. Apparently my server, with Netspeed at not-zero-minimum (512k), and only occasionally available in the pool during the day due to large moves in the monitoring score, peaks at a NTP request rate higher than what I estimate for the entire country of Spain. In numbers: 120,000 requests per second. At those peaks, 99% of the traffic is originating from just 10% of the client IPs, which correspondingly are heavily ratelimited. So either the Philippines have a lot more devices per capita that query the pool than other countries and most of them behind some kind of NAT, or they have some seriously broken clients or setups. Also, the number of requests my server got increased even during times where it was not active in the pool. The only thing I could think of leading to this is if somewhere the DNS responses from the pool are cached for far longer than they should? This all sounds rather strange, so i think one solution might actually be to figure out why there are so many requests and not just to fight the symptom with more servers or a different distribution mechanism. Do you have any ideas where to start? I was thinking of writing mails to the abuse teams of the IP addresses with the largest request rates, since those are only a couple dozen addresses from a handful of ISPs. [Next page](https://community.ntppool.org/t/certain-servers-are-not-replying/3238.md?page=2)