Fortigate WAN port issue

[Shrisundar]

Hi Team,

We have replaced watchguard XTM with Fortigate 240D firewall last week.We are having slow upload speed from day 1.When i set WAN port to auto speed it automatically takes 100mbps half duplex.I had to manually force it to full duplex.This is speed that has been set on ISP side.Issue still remains and i spoke with fortinet tech support.They feel that WAN port should not take half duplex speed when it is set to auto.Now i'm stuck between ISP and fortinet tech support.ISP adviced that forcing a WAN port speed is not going to affect upload speed.I connected a laptop to ISP device directly and i could clock the full upload and download speed.Sometimes downloads gets disconnected and i had to disable the Webfilter and App control features to re download files again.Request help from experts here.

Thanks a lot!

[chekidorje]

Hellow I have 300E fortigate with 1 gig interface and after converting to transparent mode 1 gig interface is showing only 100 mbps. Is this because of firmware( my firmware is v5.4.4)

[MattUK]

Hi, We are having a similar issue. Can you tell me what switch you put in place and did you leave it AUTO or did you force a specific speed at both the FW and Switch?

[gschmitt]

Shrisundar wrote:

When i set WAN port to auto speed it automatically takes 100mbps half duplex.I had to manually force it to full duplex.This is speed that has been set on ISP side.Issue still remains and i spoke with fortinet tech support.They feel that WAN port should not take half duplex speed when it is set to auto.

I've had this issue aswell on multiple locations, two different FortiGate models with the same ISP (may I ask which ISP you are using?)

For some reason "Auto" ends up as 100Half and I had to set it to 100Full manually

[Dave_Hall]

We maintain about 60-80 rural remote sites with approx 45 Fortigates devices installed at those locations; these Fortigates are connected to various satellite/radio/DSL/cable equipment, that it has been our experience to simply force one side (usually the ISP side) of the WAN connection to full (10/100) duplex whenever possible and let the other side "auto-negotiate" the connection.  This maybe odd but sometimes (usually with older satellite/radio equipment) forcing both sides of a WAN connection to 100 Full duplex could still cause the connection to "drop" for some odd reason; in those cases I think we ended up just sticking a small 5-port 100mb/1GB switch between the two devices.

Do a google search on duplex mismatch or Autonegotiation, you'll come up with similar pages explaining the problems with various duplex/speed settings.

[chekidorje]

Hellow I have 300E fortigate with 1 gig interface and after converting to transparent mode 1 gig interface is showing only 100 instead of 1 gig. Is this because of firmware( my firmware is v5.4.4

[rwpatterson]

Start a new post. Don't drag a three year old one out of the mud... Maybe referring to this one might help, but doubtful.