QUOTE(eric_tan @ May 24 2013, 08:24 AM)
I don't use Fortigate. My customer had a 50B (maitenance contract expired), but having issues with it. Sometimes on heavy load, it will just "lag". After disabling almost every feature... it still lags. The latency on peak period could be like 10 secs before there is a response. He told me, company started small, but at this size maybe the Fortigate cant handle the load. In the forum, some said to flash to earlier firmware, which are more stable and efficient...
In the end, we just test with my "standby/testing" 751G on 40+ users. No more issues with "lag". Waiting for them to order a RB2011UAS. The issue now is they using those home grade wireless routers as AP. Some would just "hang" when too many users try to connect. Told them to get some Ubiquiti APs, but customer said will upgrade in stages because of limited budget. Will implement a 2 VLAN on 2 seperate broadband services when the 2011UAS comes in with backup failover. Total users should peak at 60+.
Back to your GB issue, I agree that it should just work out of the BOX. Not sure about the Auto-Neg issue (just goggle it). My 751G and 750G no issues when connecting to GB Switch. I just checked 2 of my customers RB2011, also no issue when connecting to GB Switches. However I noticed that the GUI is only showing 100MB, while when I use command line, it shows GB with Full Duplex.
Did you know there is a "master port" on the Mikrotik, features where the ports are linked together like a "switch" giving you wire speeds, without any CPU utilization. If the packet is NOT meant for the switch (layer 2), it will pass to router (layer 3). I would suggest "switching" the ports together reducing the CPU usage and getting closer to Wire speed. When you test your throughput, remember to enable the "master port". And if you could, disable it and see what is the difference

And in Mikrotik got Traffic Flow (IP-> Traffic Flow) feature, where it is NetFlow compatible. I think they support V5 and V9 of netflow. What software you use to monitor? I am using PRTG. Is there a better one?
If you want to pinjam my "standby/testing" 751G unit, you can after I install for my customer next week.
Your client fortigate, how is the traffic being monitor? As Proxy or Flow-based for the firewall and antivirus? Flow base will be faster, proxy based it will download into the firewall verify than only push to client. This may look slow because it need to download into the firewall before push to client.
It also could be slow due to higher traffic now and that unit cannot handle. How long is that unit running? Check the ram and cpu usage on the gui dashboard.
I found out fortigate using sflow (similar to netflow), will try configure it next week. I was using NetFlow Traffic Analyzer, and Cisco own analyzer. Now that I want free maybe PRTG will do

Thanks for the tip on mikrotik, I told my friend on the issue I mention earlier, he is ok to buy and I will help him to setup. So if can't work out will use it for other things.