# Aggressive client sending huge amount of requests
**URL:** https://community.ntppool.org/t/aggressive-client-sending-huge-amount-of-requests/4413
**Category:** Server operators
**Created:** [May 11, 2026, 12:09pm UTC](https://community.ntppool.org/t/aggressive-client-sending-huge-amount-of-requests/4413 "2026-05-11T12:09:03Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@meszaros.norbert](https://community.ntppool.org/u/meszaros.norbert)
#### Post date: [May 11, 2026, 12:09pm UTC](https://community.ntppool.org/t/aggressive-client-sending-huge-amount-of-requests/4413/1 "2026-05-11T12:09:03Z")
Hi team, I am brand new.
I have joined the pool with my stratum 1 server. I have a kind of aggressive client hammering me with requests, specifically
158.195.159.1 4.83 req/s Int=-2
measured for 60 secods.
I have tried to contact them, that they might have wrongly set clients behind one IP, but no response, yet. I am wondering if setting a limit is a good idea, specially to not hurt the pool. Any suggestions? Thank you
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### Author:  [@ebahapo](https://community.ntppool.org/u/ebahapo)
#### Post date: [May 11, 2026, 2:49pm UTC](https://community.ntppool.org/t/aggressive-client-sending-huge-amount-of-requests/4413/2 "2026-05-11T14:49:14Z")
Setting a limit to protect your server from a rogue client to protect its serving the pool is good for the pool.
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### Author:  [@bjh21](https://community.ntppool.org/u/bjh21)
#### Post date: [May 11, 2026, 4:51pm UTC](https://community.ntppool.org/t/aggressive-client-sending-huge-amount-of-requests/4413/3 "2026-05-11T16:51:21Z")
I would just ignore it. 5 requests per second is more than any single client should be sending, but itโs about 0.1% of the load that each of my servers gets from the Pool. Is it causing you any trouble that makes it worth the effort of doing something?
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### Author:  [@meszaros.norbert](https://community.ntppool.org/u/meszaros.norbert)
#### Post date: [May 11, 2026, 5:47pm UTC](https://community.ntppool.org/t/aggressive-client-sending-huge-amount-of-requests/4413/4 "2026-05-11T17:47:19Z")
Hi,
thanks for your reply.
For now it does not cause any issues, and it seems to be an university server, so probably it is serving as a NAT or aggregator for the local clients. I was just not sure, if I can leave it like that or limit the requests, cause my client list at the moment shows almost 500 000 clients. Majority of them has regular requests like 1 in 2-4 secodns. Just this one seems to be hammering me a bit.
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### Author:  [@NTPman](https://community.ntppool.org/u/NTPman)
#### Post date: [May 12, 2026, 8:36am UTC](https://community.ntppool.org/t/aggressive-client-sending-huge-amount-of-requests/4413/5 "2026-05-12T08:36:05Z")
@meszaros.norbert welcome to the community! ๐
There are known broken clients out there in the wild that sends excessive number of NTP queries. I set up standard rate limit (one query every 2 seconds + some burst permitted) on the NTP servers that I am maintaning. However, I permanently block via iptables the clients with extrem high NTP query rate.