Download speed drastically slowing

[PedroD]

I have just switched over to OPNsense from an ASUS router.  Right after boot up the speed test returns 360 Mbps download and 24 Mbps upload, then 10 minutes later the test returns speed of 5 Mbps download and 23.5 Mbps upload.  Additional tests return similar numbers.  Reboot the OPNsense and download speed increases back to normal, but then decreases down to 5 Mbps.

Versions    OPNsense 19.7.7-amd64
                FreeBSD 11.2-RELEASE-p16-HBSD
                OpenSSL 1.0.2t 10 Sep 2019

Any advice would be appreciated

[PedroD]

I switched back to my RT-AC87R and I am now getting a consistent 300+ Mbps download speed.  The upload speed is the same on both the Asus router and the OPNsense firewall (about 23-25 Mbps).

[PedroD]

Does anyone actually respond to the posts with any help?  Is there a better forum to post these questions / problems on to?

[chemlud]

Support forum of your ISP?

[chbmb]

Does anyone actually respond to the posts with any help?  Is there a better forum to post these questions / problems on to?

Like most forums, people respond if they feel they can offer any help or advice.  Generally no replies, means nobody has any advice for you. 

I've posted recently and had replies. 

[LouieLouie]

I have just switched over to OPNsense from an ASUS router.  Right after boot up the speed test returns 360 Mbps download and 24 Mbps upload...

disclaimer:  I am not an expert by any means.  I simply have some experience.

In my opinion, the fact that you get 360Mbps is a clear indication that the opnsense hardware AND the configuration of opnsense is working as desired.  If it works when you turn it on, the basic setup most likely is correct.

The next 2 things which I would research are 1) as chemlud stated, your isp could be doing something wonky.  If they are, I'd guess that they would do it via detecting the different MAC address.  You could have opnsense spoof the Asus MAC.  2) there's a service on the server or in your configuration that has a delayed start, and it's eating bandwidth.  I don't know specifically how to diagnose that, but start with logs.... google it ("freebsd network hog")... be curious.

I get it that it's frustrating, and I have the same Asus router, it's been great.  However, Opnsense is better and it's worth the learning curve.

Kind regards!

[miroco]

If you are using Multicast (IPTV) it could have the same effect as a DDoS attack. Check your firewall log.

https://www.ionos.com/digitalguide/server/know-how/igmp-snooping/