Date: Mon, 19 Aug 2002 13:33:23 -0700 (PDT) From: Carlos Carnero <zopewiz@yahoo.com> To: freebsd-net@freebsd.org Subject: Bandwidth throttling with dummynet(4) Message-ID: <20020819203323.25886.qmail@web21411.mail.yahoo.com>
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Hi, I have a "lab" here where I'm testing (and learning) traffic shaping with dummynet(4). I have a Windows XP host computer and a couple of VMware virtual computers: one running FreeBSD 4.5-RELEASE-p18, with two virtual Ethernet adapters and other running NetBSD 1.5.2 with one adapter. My FreeBSD "box" is the router/gateway for the NetBSD box, providing firewalling and NAT. Pretty much a standard setup, and it works OK (you should see the double NATting ;) Anyway, I have compiled into the kernel both IP Filter and FreeBSD's own ipfw, with the purpose of traffic shaping/bandwidth throttling. But the numbers I get are not what I expect. For instance, my ipfw rules are like: pipe 1000 config bw 5KByte/s queue 50 pipe 1001 config bw 5KByte/s queue 50 add 50000 pipe 1000 tcp from 192.168.250.3/32 to any add 50001 pipe 1001 tcp from any to 192.168.250.3/32 (192.168.250.3 being the NetBSD "box") But when I transfer a file using FTP from the Windows host I get _almost_ 1 KByte. Note that I remove the pipes speeds reach ~800-900 KByte/s, almost saturating the "virtual" Ethernet interfaces. Changing the pipe bandwidth to, say 25KByte/s in both pipes yield an FTP speed of ~5-6 KByte/s. Is this OK or FTP is that inefficient? What other tests can I run to check the bandwidth _not_ using FTP? IP Filter's ruleset is currently set to pass everything as quickly as it can :) Thanks a lot, Carlos. PS. Posting from Yahoo! until I solve some reverse DNS bugs I inherited :| __________________________________________________ Do You Yahoo!? HotJobs - Search Thousands of New Jobs http://www.hotjobs.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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