On Tue, Jun 28, 2011 at 3:03 AM, William Salt <[email protected]> wrote: > Hi All, > For the last couple of months i have been pulling my hair out > trying to solve this problem. > We have a 1Gbps transatlantic link from the UK to the US, which has > successfully passed the RFC2544 test. > At either end, we have a media converter, and a supermicro server with an > intel quad port NIC running pfsense 2 (RC2 at one end RC3 at the other) and > the IGB driver on the quad port. > We can pass 1gbps either way with UDP. However we are experiencing very > strange issues with tcp connections. > With window scaling enabled, and a max socket buffer set to 16MB, we see no > difference. > Even disabling window scaling and setting the window to 16MB makes no > difference. > Each TCP connection starts very slowly, and will max out at around 190mbps, > taking nearly 2 minutes to climb to this speed before plateauing. > We have to initiate many (5+) connections to saturate the link with tcp > connections with iperf.
Typical symptoms with a "long fat pipe" and TCP, you can Google that to find lots more info. You need to make adjustments on the source and destination hosts as they handle windowing, the firewall just passes that traffic. If you're actually testing with iperf on the firewall itself then the same considerations apply to it, though that's probably not indicative of the eventual real world usage. --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected] Commercial support available - https://portal.pfsense.org
