Hello I MikroTik quad ethernet products in my router. I have the RB44G (10/100/1000 Mbit) and I have the RB44 (10/100) PCI adaptor.

I *think* I may have found a bug with VLANS in the RB44G (NOT the RB44).

I have a switch with 3 vlans configured (ether port 2=vlan2, port3=vlan3, port4=vlan4 - all untagged) then they all connect as a asymmetric VLAN to port 25 (the gigabit port) Tagged. I configured MikroTik to plug into port 25 on the switch (tagged/1000 mbit port).

I have a notebook computer configured with an IP address of 192.168.1.2/24 and I have configured a VLAN interface on MT with 192.168.1.1/24 (vlan#2) physically bonded to ether0. Ether0 itself does NOT have an IP - the IP address is connected to the VLAN tag #2

Notebook is plugged into untagged port #2 on the switch - corresponding with VLAN#2 - traffic then moves to port #25 (tagged) to a gigabit ethernet port on the MikroTik box.

When I ping from the notebook to mikrotik, it seems to work fine with the default ping settings. When I move the packet size up beyond 1468 (moving to 1469+) - the ping doesn't work and I have to disable and re-enable the ether0 port for the system to resume normal 64 byte ping payloads - seems to 'crash' something, it's not simply a matter of the packet doesn't get thru - it somehow 'breaks' the router, and I have to restart to ethernet port to get ANY traffic to flow again.

When I do this exact same procedure with the RB44(100 mbit) PCI card, this setup works flawlessly. I can even ping beyond 1500 bytes!

I played around with the MTU settings afterwards on the router - but for my testing, everything (VLAN and ethernet card port) was set to 1500 the whole time.

Any suggestions? Have I found a bug?

Max,
I have found similar issues with VLAN's on the RB44G. I have yet to test in on 2.9.42 though. However, I did send my config to Mikrotik and they said they had no problems with it on .42. I will let you know later on today how it works out.

I am using 2.9.42 - glad hear I'm not alone!

wow, I tried 2.9.42 and it wouldn't even show my interfaces. I exported the support.rif file and it is on the way to Mikrotik as we speak.

hm that's interesting, have you tried the same setup on other pc?

No I haven't however, I've had many problems with the RB44G before 2.9.42 and no matter what combination of hardware, boot device, cards etc - I had the same troubles. I have different brand motherboards, RAM, CF to IDE's, CFs I own 2 RB44G PCI devices (one for backup) but I've used that for testing too. I find it odd that the 100 Mbit version of the RB44 works flawlessly. I'm not opposed to trying other hardware, but I must admit - I'm rather tired of debugging all this. I'm trying to find an Intel card that is suitable and that won't break the bank. Does anyone have any recommendations for a PCI Intel Dual or Single 1000 Mbit VLAN capable card?

My apologies - I didn't realize you were replying to the other thread (long day) - I haven't exeperienced that problem with 2.9.42 (interfaces disappearing) however, I did NOT upgrade - this was a fresh install of the OS. However, I did try upgrading before I purchased the license, and I did not have that problem with the RB44G.

I wish I could be of further assistance.

there is a driver fix since 2.9.41
we experienced some issues too, but since 2.9.41 was released, everything works fine, even VLANs.

My VLANs have not been fixed with the updates unfortunately.

you have not reported a bug, none did, and you are hoping that it will be.

we have not encountered that problem, so please, report it to support.

I did submit a support ticket - but I did not get the automated responce - I will try again.