Date: Sat, 16 Aug 2003 17:58:04 +0100 From: "Company 2210" <company2210@hotmail.com> To: <freebsd-net@freebsd.org> Subject: High UDP Loss issues Message-ID: <Law12-OE16IhkUt50R700029982@hotmail.com>
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Hi,=20
I have two FreeBSD 5.0-RELEASE boxes connected over an IPSEC (With =
racoon) wireless link ( both are gateways). Now, TCP traffic flows =
perfectly, and at the expected speeds ~4.2Mbps. However UDP traffic =
flows at 10.6Mbps with enormous loss. An output from netperf is shown =
below:
$ ./netperf -f K -H 10.0.0.2 -t UDP_STREAM
UDP UNIDIRECTIONAL SEND TEST to 10.0.0.2
Socket Message Elapsed Messages =20
Size Size Time Okay Errors Throughput
bytes bytes secs # # KBytes/sec
8192 8192 10.00 13084 416919 10462.48
42080 10.00 9 7.20
I've tried playing with the MTU on both boxes (network cards and gif =
tunnel interfaces are set to 1500), but it has made no difference. Now, =
this is where the plot thickens, I have a second wireless link which =
connects to a Windows XP box (Layout below):
FREEBSD-BOXA <----------IPSEC--------> FREEBSD-BOXB <------Unencrypted =
Wireless Link------> Windows XP - BOX
When I run netperf from the Windows XP box to FreeBSD BOXB I get no UDP =
errrors:
C:\PROGRA~1\NETPERF>netperf -f K -H 81.19.79.1 -t UDP_STREAM
UDP UNIDIRECTIONAL SEND TEST to 81.19.79.1
Socket Message Elapsed Messages
Size Size Time Okay Errors Throughput
bytes bytes secs # # KBytes/sec
8192 8192 10.00 1465 0 1172.00
42080 10.00 9 7.20
C:\PROGRA~1\NETPERF>
I am totally at a loss as to why all UDP traffic between the freebsd =
boxes has an ultra high error rate, but all other traffic doesn't. I'm =
guessing it may be a flow control issue? but I'm not sure how this could =
be rectified. Any help greatly appericated.
Colin.
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