Hi all, I have talked about this many times, and I have solved the heavy NAT problem. But there is another problem, far more serious for me. The number of NAT-session is solved because other people jumped in and helped Belgium in traffic offloading. However, I ran into a new underlying problem, a…

@ccb056 , You may be right. net.netfilter.nf_conntrack_max = 1048576 was 262144… If that is the solution, I buy you a beer!!! I hope so. I raised it, let’s see what it does. I suspected the connection-tracking for a long time, is it really this simple? My current adjustments: net.netfilter.nf…

Who cares. It’s not a simple OS and GUI to use. It works for you, it doesn’t for me and many others. My topic is about solving the problem of NAT-NTP going bad. It’s not about who can work out MicroTik, it’s about a router that does work out of the box and is easy to configure AND has no problems…

MikroTik has worked for me for NTP from day one and I did not have to change anything special. Either you were doing something wrong with your MikroTik or you didn’t know what the hell you were doing. Even more, my model is an older one, less powerful than your RB5009 and it still has no problems wi…

Well it has been running at 25mbit for hours and not a single issue. Not even a change to UDP timeout, still 30 seconds, but change it to 15 seconds anyway. But I found that IPsense uses more memory, 2GB out of the 8 it has. It’s not the CPU that matters, it memory to spare. I run many more stuf…

sounds like you’re ready to change it to 3 gbps!

Can’t because my DSL connection is 100mbit down and 35mbit up. I run some other services too. I wish I could get fiber over here, but I can get cable 500mbit/20mbit…won’t help much and it’s much more expensive. I do have rack-servers that run much higher speeds, IPv4 and IPv6. It will probably t…

This was the setting, I went up every time, the last peaks where 25mbit, before I lowered it again. [afbeelding] Let see what 1Gbit does, as Belgium has too little servers, it’s probably putting too much pressure. But I want to test it. This isn’t a VPS, but an homeserver. Let’s give it a try …

See what happens on the router… [afbeelding] It goes waaaaaay up at 1GBit, 15K connections (read = memory), but the local lan seems so far unaffected. I’m not keeping this 1Gbit setting, but it’s fun to see that IPfire has no problems with it (so far).

What the h*ll is going on? This is the 1Gbit speed setting… [afbeelding] I have NO issues (yet), fingers crossed. I never ever got this far, no Draytek, no Fritzbox, no MicroTik, not anything. I did a tiny bit of IPfire tweaking, but my local network is not affected after 30 minutes. What is g…

that “spike” looks like only 400 packets per second - thats not very much at all - less than 1 mbps I think

Modem/Routers slowdown on heavy traffic

Server operators

ccb056 June 27, 2026, 6:56pm 152

Your netspeed is set to 25 mbps - but what is your average upload rate over the last 24 hours?

For example - my netspeed is set to 3 gbps - I only have 1 gbps full duplex fiber - but ntp only accounts for 6 mbps of traffic

Some good information about the netspeed setting here:

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Modem/Routers slowdown on heavy traffic

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