Forum Discussion
Greg_33923
Nimbostratus
NimbostratusSlow File upload and download Speeds via F5 BigIP
BIG-IP 9.4.4 Build 94.0 Hotfix HF3
We have some F5 Load balancers that are load balancing apache webservers and the traffic at the moment is pretty lightweight. However, we have introd...
dan_19334Nimbostratus
NimbostratusWe have seen this, especially downloading large files across a VPN connection, where going through the LTM was noticeably slower than going directly to the server.
For our situation, one thing we noticed was that the MSS is negotiated between the LTM and client at (something like) 1380 and was negotiated to 1480 between the LTM and web server. With large files, this caused the LTM to have to fragment each packet and significantly slowed down the overall download speed.
We enabled the "Proxy Maximum Segment" TCP Option which helped so that it is the same MSS on both sides of the connection and prevents fragmented packets.
-Dan
