I have a 1000Mbps downlink connection to my ISP.
When connected via the 2.5G link on port 1 to the ISP cable modem, the connection speed maxes out at about 500Mbps
When removing the 2.5G negotiation speed on ethernet1 inside RouterOS and connecting to the cable modem, the speed is around 950Mbps
Steps to reproduce the issue; Enable “2.5Gbps Full” advertise on Interface Ether1 → Internet speed test goes to ~500Mbps Remove “2.5Gbps Full” advertise on Interface Ether1 → Internet speed test goes to ~900Mbps
did you tested the same cable modem connected 2.5g computer or router?
the issue may be with the cable modem itself.
I had issues recently with an wireless access point that had a bug when connected to 2.5g port I had really slow speeds, that did not happen when connected at 1G.
Do you know if that particular cable modem have a Broadcomm SoC?
I have the same issue and there are a ton of others out there having it as well. In fact I haven’t seen anyone claim that the 2.5G port works for them. It seems to be an issue when you go between speeds.
2.5G port - WAN
SFP+ port - S+RJ10 connected to PC at 2.5G
In this setup the 2.5G PC can get the full 1400mbps from the WAN connection. But any 1G device on the network suffers from the 500mbps download speeds. If the speed settings on the 2.5G port are changed to only advertise 1G then all devices are able to reach 900mbps.
In my configuration my WAN port is on a 1g port and my computer is on the 2.5g port on LAN bridge. Since my setup is opposite, my lower speed is on upload rather than download which indicates that the problem is 2.5g port sending. My behavior is exactly the same, if I remove the 2.5g advertisement and force the computer to connect at 1g my upload speed returns to normal. By the way my computer on the 2.5g port has an Intel I-225V NIC built into the motherboard.
I also had another problem with the 2.5g port that I’m not sure is related but may be. I noticed that at 2.5g if I upload large amounts of data to the internet (this occurred during my nightly remote backup), the 2.5g connection would go down. Windows would show a cable connected but no internet, renewing the IP address hangs forever, can’t ping or connect to anything. All other devices on the RB5009 were fine and had internet, just my computer on the 2.5g port loses connection and never returns. Only thing I found that fixed it was to reboot the PC, never had to reboot RB5009 to fix it. It seems like this is a related problem because it only occurs when my computer uploads large amounts of data, downloading had no problem. Since removing the 2.5g advertisement and running at 1g, I no longer have this problem. For this reason the 2.5g port is unusable at 2.5g to me at the moment which is disappointing.
I also have a MB with the Intel I225v, are you aware of it’s hardware bugs? there is multiple offers to “fix it” but notthing actually effective. there is an fixed HW ver, but most of us got stuck with the bugged one. the only way to know if you have an affected one, is looking on the chip itself, under the motherboard heatsink.
I got mine working “okay” after a combination of a older driver and a nic firmware update. if you let windows update the driver you will get slow speeds, I actually had issues even when in 1g mode.
P.S: This test is a local intra-vlan to my DMZ that is in a server connected to the SFP+ port at 10G.
I’m getting about the same performance as jookraw using a similar setup though the 2.5G NIC I’m pointing it at is a RealTek rather than an Intel. It seems the RB5009 2.5G is ok talking to a RealTek. So far I’ve just been playing with it. I’m new to RouterOS and haven’t deployed it yet. When I do I’ll be pointing the 2.5G port at a Comcast-approved cable modem that I fortunately haven’t bought yet. After seeing this Reddit post https://www.reddit.com/r/mikrotik/comments/rq7ytu/rb5009_25gbe_slower_than_1gbe/ I think I’ll go with the Netgear CM2050V modem. It’s one of my two options for 1.2G service. The other is a Motorola MT8733 WiFi cable router. I’d have more options if I didn’t have phone service. I figured I’d wait to upgrade my modem until I got the RB5009 up and running, then after upgrading the modem upgrade my service.
The machine I have the 2.5G port on the RB5009 plugged into has a RealTek RTL8125 with firmware rtl8125b-2_0.0.2 07/13/20, running the stock driver included in RedHat 8.5. Test setup is basically:
IPV4
IP V6
Normally the server machine uses a 10G Mellanox ConnectX4 and a DAC cable to the CRS, but I rearranged things to test the RB5009. The CRS is basically in dumb mode for now, though I’ll be using VLANs once I get the RB5009 deployed.
Sorry, left that out. It was in response to a support ticket where we’ve been passing supout files, scenarios, etc. I’m eagerly awaiting the next testing branch update to scour over the change log that’s for sure.
For me, flow control was a completely separate issue but solved just general issues on my network with mismatch link speeds causing buffers to overflow.
I’m trying some test builds from MikroTik, will report back!
Three of the four test versions worked very well! Encouraging, I’m sure more to come soon from Mikrotik! I’ve restored to 7.2rc4 for now, not going to run those alpha builds
